Kimya Mühendisliği Bölümü Koleksiyonu

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https://hdl.handle.net/20.500.12428/2678

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Boron Rejection from Aqueous Solution and Wastewater by Direct Contact Membrane Distillation
(2020) Tan, Burcu; Selengil, Uğur; Bektaş, Tijen Ennil
Boron is widely used in various areas of modern technology. Due to the environmental problems arising during the production and use, the studies on the removal and recovery of boron from wastewater have been increased recently. Membrane distillation (MD) system is smaller in size with respect to other common distillation systems and needs lower operating temperatures. In addition, the equipment costs are reduced and the safety of the process increases since it operates at lower pressures. Moreover, the membrane distillation process can remove pollutants from water without using chemicals. In this study, boron rejection from aqueous solutions and wastewater was investigated by using direct contact membrane distillation (DCMD) system where both surfaces of a porous hydrophobic membrane were in contact with liquid streams. The effects of various parameters (pH, feed concentration, feed temperature, etc.) on boron rejection were investigated and the highest boron rejection was found to be 50 % when pH=10 at 50 degrees C and with feeding by a pump of 54 rpm. According to the test results of wastewater from Kirka Borax treatment plants, the mean distillate fluxes were found as 13, 16 and 14 L/m(2)h at the feed temperatures of 30, 40 and 50 degrees C, respectively. The boron removal percentages were found to be 47, 64 and 48 % at 30, 40 and 50 degrees C, respectively. It was observed in the XRD spectra that the crystals in wastewater mainly consist of Na2B(OH)(4)Cl and Mg2B2O5 structures.
Effectiveness of fly ash in boron removal from Tuzla (Çanakkale) geothermal fluid
(Yıldız Technical University, 2021) Şahin, Mehmet Oğuzhan; Bektaş, Tijen Ennil; Şanlıyüksel Yücel, Deniz
The heat accumulated in the inner parts of the earth's crust is transmitted to the fluid in the geothermal aquifer by means of transportation. The geothermal fluid is transported to the surface either by wells or naturally. In this study, the geothermal fluid in Tuzla geothermal field in Çanakkale city was examined due to its high boron content (10.3 mg L-1). It was aimed to remove boron from geothermal fluid by adsorption in order to prevent possible negative effects on the environment. Fly ash was obtained from Çan thermal power plant. The specific surface area of the fly ash was 14.6 m2 g-1 and the particle size was between 1.45 and 186 µm. According to ASTM C618 standard, fly ash was classified as Class C. Fly ash was composed of anhydrite, lime, hematite, cristobalite, quartz, calcite and feldspar. Various parameters such as initial pH, adsorbent dosage, contact time, and temperature were studied experimentally for the removal of boron from the geothermal fluid. The suitability of pseudo-first-order, pseudo-second-order, and intraparticle kinetic models to experimental data was examined. The data obtained from the isotherm studies were applied to the Langmuir, Freundlich and Dubinin-Radushkevich models.
Boron rejection from aqueous solution and wastewater by direct contact membrane distillation
(Yildiz Technical University, 2021) Tan, Burcu; Selengil, Uğur; Bektaş, Tijen Ennil
Boron is widely used in various areas of modern technology. Due to the environmental problems arising during the production and use, the studies on the removal and recovery of boron from wastewater have been increased recently. Membrane distillation (MD) system is smaller in size with respect to other common distillation systems and needs lower operating temperatures. In addition, the equipment costs are reduced and the safety of the process increases since it operates at lower pressures. Moreover, the membrane distillation process can remove pollutants from water without using chemicals. In this study, boron rejection from aqueous solutions and wastewater was investigated by using direct contact membrane distillation (DCMD) system where both surfaces of a porous hydrophobic membrane were in contact with liquid streams. The effects of various parameters (pH, feed concentration, feed temperature, etc.) on boron rejection were investigated and the highest boron rejection was found to be 50 % when pH=10 at 50 °C and with feeding by a pump of 54 rpm. According to the test results of wastewater from Kırka Borax treatment plants, the mean distillate fluxes were found as 13, 16 and 14 L m-2 h-1 at the feed temperatures of 30, 40 and 50 °C, respectively. The boron removal percentages were found to be 47, 64 and 48 % at 30, 40 and 50 °C, respectively. It was observed in the XRD spectra that the crystals in wastewater mainly consist of Na2B(OH)4Cl and Mg2B2O5 structures.
Use of activated carbon obtained from waste vine shoots in nickel adsorption in simulated stomach medium
(Springer Science and Business Media Deutschland GmbH, 2023) Er Çalişkan, Çiğdem; Çiftçi, Harun; Çiftçi, Tacettin; Kariptaş, Ergin; Arslanoğlu, Hasan; Erdem, Mehmet
In this study, it is aimed to remove nickel from the simulated body fluid by adsorption technique in order to reduce its harmful effects on the human body. Activated carbon was used for the adsorption of Ni(II) pollutants that may occur in the simulated stomach medium. Activated carbon gave a very porous structure with different sizes of pores by presenting a morphology suitable for the adsorption process. The results show the efficiency of activated carbon with interesting surface area values (1689 m2 g−1) and total pore volume (0.842 cm3 g−1). The most suitable adsorption parameters for nickel ions in the stomach environment simulated in a batch system (pH, time, mixing speed, amount of adsorbent, and the effect of other ions, etc.) were investigated. The initial nickel ion concentration was 10 mg L−1 and the adsorbent amount was 0.3 g, and it was determined that the maximum retention efficiency of nickel ions in the pH range 3.5–5.5 was 92%. The activated carbon material was also highly effective, with a maximum of 91.8% removal at 10 mg L−1 of Ni(II) solutions. Finally, the prepared material has basic properties that make it an effective adsorbent in purifying the pollutants that occur in the simulated stomach medium and we recommend that it can be used to clean the stomach environment in nickel poisoning in emergency interventions.
Correction to: Releases of metal bound modified sugar beet pulp (Me2+MSBP) using various aqueous solutions: its use as slow release fertilizer (Aug, 10.1007/s13399-023-04649-0, 2023)
(Springer Heidelberg, 2024) Türk, Feride N.; Arslanoğlu, Hasan
Correction to: Recycling of Labada (Rumex) biowaste as a value-added biosorbent for rhodamine B (Rd-B) wastewater treatment: biosorption study with experimental design optimisation (Jan, 10.1007/s13399-022-02324-4, 2022)
(Springer Heidelberg, 2023) Şenol, Zeynep Mine; Çetinkaya, Serap; Arslanoğlu, Hasan
[Anstract Not Available]
Removal of food dyes using biological materials via adsorption: A review
(Elsevier Sci Ltd, 2024) Şenol, Zeynep Mine; El Messaoudi, Noureddine; Ciğeroğlu, Zeynep; Miyah, Youssef; Arslanoğlu, Hasan; Bağlam, Nurcan; Kazan-Kaya, Emine Sena
It is alarming that synthetic food dyes (FD) are widely used in various industries and that these facilities discharge their wastewater into the environment without treating it. FDs mixed into industrial wastewater pose a threat to the environment and human health. Therefore, removing FDs from wastewater is very important. This review explores the burgeoning field of FD removal from wastewater through adsorption using biological materials (BMs). By synthesizing a wealth of research findings, this comprehensive review elucidates the diverse array of BMs employed, ranging from algae and fungi to agricultural residues and microbial biomass. Furthermore, this review investigates challenges in practical applications, such as process optimization and scalability, offering insights into bridging the gap between laboratory successes and real-world implementations. Harnessing the remarkable adsorptive potential of BMs, this review presents a roadmap toward transformative solutions for FD removal, promising cleaner and safer production practices in the food and beverage industry.
Use and applications of metal-organic frameworks (MOF) in dye adsorption: Review
(Elsevier Sci Ltd, 2023) Sağlam, Semanur; Türk, Feride N.; Arslanoğlu, Hasan
Dyed wastewater has a serious impact on living organisms. It must be treated to a certain level before being released into the environment. Dyed wastewater is non-biodegradable, toxic and has been found to have carcinogenic effects in long-term exposure. Therefore, the treatment of dyed wastewater has become a global concern. In this context, researchers have proposed metal organic frameworks (MOFs) as the most effective method for dye wastewater removal. Because MOFs show high adsorption capacity in dye removal with adjustable pore diameter and surface morphology compared to conventional carbonaceous materials (activated carbon, carbon nanotube, biochar, zeolite, perlite, etc.). In this context, many studies have been carried out on MOFs until today. With the developing technology and studies, the weaknesses of MOFs have also been improved. Various types of MOFs have been produced, including modified MOFs, Metal Organic Gels obtained by adding aerogel-hydrogel and membrane-based MOFs. In this study, it was aimed to examine the effectiveness of these MOF types in the process of dye separation from wastewater. Within the scope of this investigation, MOFs that are effective in the treatment of dye wastewater were evaluated by examining MOF studies in the past years. Adsorption isotherms and kinetics were also examined to understand the effectiveness of MOFs in dye waste-water adsorption. In addition, the effectiveness of characterization studies of MOFs in dye removal was examined. Desorption and reuse of MOFs are also included in the scope of the research as they are important in terms of cost.
Heat transfer with MgO nanofluid in laminar flow: experimental study and ANSYS modeling
(Springer, 2024) Demirpolat, Ahmet Beyzade; Uyar, Muhammed Mustafa; Arslanoğlu, Hasan
Different methods are currently being developed to regulate energy cycle systems and to maximize the utilization of the energy resources available to us. In this context, other methods are being developed to use heat transfer more effectively to utilize energy more beneficially in in-pipe flows. In study, the heat transfer coefficient (h) values were determined by using MgO nanoparticles together with pure water, ethanol, and ethylene glycol materials in the nanofluid experimental setup. In the continuation of the experimental study, the variation of the heat transfer coefficient according to the Reynolds number was examined through experimental modeling in the ANSYS program using MgO nanofluid. In line with these calculations, it is observed that when MgO nanofluid is used in the system, the heat transfer value increases positively compared to pure water. Under the same conditions, when MgO nanofluid was used, the flow was laminar and heat transfer was achieved without turbulence. In conclusion, the use of nanofluid in thermal systems is of great importance, as the data we obtained reveal. In study, analyzing the experimental results of the MgO nanofluid we produced and modeling the results with ANSYS FLUENT software contributes to the literature as an innovation.
Exploring role of polyester composites in biocomposites for advanced material technologies: a comprehensive review
(Taylor & Francis Inc, 2025) Dağ, Mustafa; Aydoğmuş, Ercan; Arslanoğlu, Hasan; Yalçın, Zehra Gülten
This study represents the culmination of our efforts to explore the crucial role of polyester composites in the field of biocomposites, highlighting their importance in advanced materials technologies. Our primary objective has been to thoroughly elucidate the significance of polyester composites within biocomposites, with a detailed examination of their impact on advanced material technologies. Through this research, we have meticulously investigated the properties of polyesters derived from biodegradable polymers, analyzing their intricate structure-property relationships and potential applications in bio-based production. To drive the industrial adoption of bio-based polyesters, our work emphasizes the need for developing economically viable production methodologies, exploring ecologically sustainable and effective material designs, and advocating for robust policy support to facilitate the commercialization of bio-based polyesters. We propose that future research should focus on the innovation of novel bio-based monomers as sustainable raw material sources, the design of diverse polyester structures utilizing material genome technology, and a comprehensive understanding of the degradation processes and long-term performance of bio-based polyesters. The advancement in this domain relies on interdisciplinary collaboration across materials science, engineering, and chemistry. Our findings underscore that through such interdisciplinary cooperation, a broader spectrum of bio-based polyester products can be developed, thereby expanding their industrial applications. In this context, our investigation aims to contribute to the advancement of sustainable materials and their more effective integration into future material technologies. Graphical Abstract
Synthesis and characterization of EPS reinforced modified castor oil-based epoxy biocomposite
(Elsevier, 2022) Aydoğmus, Ercan; Dağ, Mustafa; Yalçın, Zehra Gülten; Arslanoğlu, Hasan
In this research, both modified castor oil-based epoxy is synthesized and waste expanded polystyrene (EPS) is used as a filler in the newly improved biocomposite. The experimental work plan is optimized with response surface methodology (RSM) and the thermophysical properties of the biocomposites have been also evaluated with artificial neural networks (ANN). Chemical characterization of the synthesized modified castor oil (MCO) based biocomposite has been done by Fourier transform infrared spectroscopy (FTIR). Thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) of the obtained biocomposite have been determined. According to the results, the activation energy of the biocomposite synthesized with modified castor oil is up to 21% higher than the pure epoxy composite. The use of MCO in the biocomposite is also reduced the epoxy components (petrochemicals) by up to 13 wt%. Besides, the recycling of waste EPS in biocomposite has been reduced the production cost up to 9% and the density of the synthesized biocomposite up to 15%. Also, EPS reinforcement reduces the thermal conductivity coefficient up to approximately 17%, while MCO reinforcement decreases the Shore D hardness and increases the workability of the biocomposite. Moreover, a new model equation with hyperbolic function has been improved to examine the thermal decomposition behavior of the biocomposite. Maximum correlation coefficient and minimum error values have been analyzed statistically with Flynn-Wall-Ozawa, Kissinger, and Coats-Redfern models.
Synthesis and characterization of waste polyethylene reinforced modified castor oil-based polyester biocomposite
(Wiley, 2022) Aydoğmuş, Ercan; Dağ, Mustafa; Yalçın, Zehra Gülten; Arslanoğlu, Hasan
In this research, modified castor oil (MCO)-based biocomposite has been synthesized and its structure is strengthened with waste polyethylene (PE) reinforcement. Both the petrochemical raw material used is reduced by 12 wt% and a new environmentally friendly biocomposite is produced using waste PE. Considering some thermophysical properties of the obtained biocomposite, experimental working conditions, and composition ratios have been optimized with response surface methodology (RSM). The chemical bond structure of the biocomposite has been investigated by Fourier transform infrared spectrophotometer, thermal decomposition behavior by thermogravimetric analysis, and surface morphology by scanning electron microscopy. According to the results obtained, the density and hardness of the biocomposite synthesized by the addition of MCO to unsaturated polyester (UP) decreases, and its thermal conductivity and thermal stability increase. The thermal decomposition kinetics of the biocomposite is also modeled with the newly improved hyperbolic function equation. The relationship between conversion rate and the temperature has been determined by the new model with a high correlation coefficient (R2 = 0.9985) and low-error functions (SST = 0.0096, RMSE = 0.0285, chi 2 = 0.0037). Effective and efficient use of MCO, UP, methyl ethyl ketone peroxide, and cobalt octoate in the production process has provided an economical and steady the biocomposite. Evaluation of experimental data with both RSM and artificial neural networks raises the reliability of the model results.
Cleaner production of polyurethane (PU) foams through use of hydrodesulfurization (HDS) spent catalyst
(Springer Heidelberg, 2022) Yaras, Ali; Nodehi, Mehrab; Ustaoğlu, Abid; Arslanoğlu, Hasan; Sarı, Ahmet; Gencel, Osman; Özbakkaloğlu, Togay
Due to the increased population in the urbanized areas, considerable attention is being paid on the development of energy-efficient buildings. In construction, the use of insulating foams has grabbed considerable attention in recent decades due to their porous structure that can reduce thermo-acoustic conductivity leading to higher energy efficiency. Nonetheless, the production of certain foams (e.g., polymer foams) is based on harmful chemical substances, such as isocyanate, as well as having difficulty being recycled. In this regard, this study adopted the use of hydrodesulfurization (HDS) spent catalyst, which is a byproduct of petroleum industry and is known to be a hazardous solid waste material, to produce a more environmentally friendly composite foam with lower thermal conductivity. In this sense, a series of material property tests, as well as thermal conductivity test, have been conducted. In addition, to further confirm the impact of HDS inclusion in the produced foams, energy cost savings and CO2 emission reduction based on their actual application in four different environments and four different fuel types for heating have been evaluated. The results are found to be highly promising and point to the great potential of utilizing HDS spent catalyst as a hazardous waste to enhance the efficiency of foams leading to CO2 emission and energy use reduction by up to 68.79 kg/m(2) and 8.6 kWh/m(2), respectively. Finally, this would reduce the heating cost, up to 0.69 $/m(2) in an idealized building. In the end, suggestions for future studies in this area are also provided.
Adsorption of Reactive Black 5 dye from aqueous solutions with a clay halloysite having a nanotubular structure: Interpretation of mechanism, kinetics, isotherm and thermodynamic parameters
(Elsevier, 2025) Türk, Feride Naime; Eren, Muhammet Şakir Abdullah; Arslanoğlu, Hasan
In this study, the removal of Reactive Yellow 145 (RB5) dye found in wastewater with halloysite clay mineral (HCM), which is easily available and cheap, was investigated. For the characterization of the adsorbent; SEM, BET, XRD, and Zeta Potential Contact Angle analyses were performed. The effect of parameters such as solution pH, temperature, contact time, initial dye concentration, and adsorbent amount on the adsorption of RB5 dye onto HCM was investigated. It has been determined that the Langmuir isotherm fits the experimental data better than other applied isotherms in mathematically defining the adsorption equilibrium. In the Langmuir isotherm, the adsorption capacity was 24.9 mg/g. To find the most suitable kinetic model for the study using experimental data, Pseudo-First-Order, Pseudo-Second-Order, Elovich, and Intra-Particle Diffusion models were tested, and it was decided that the most suitable model would be the Pseudo-Second Order kinetic model. Again, using experimental data, thermodynamic parameters (Delta G degrees, Delta H degrees, Delta S degrees) were calculated, and it was determined that the adsorption process was spontaneous and endothermic.
Biodiesel Fuels Produced from Poppy and Canola Oils, Experimental Investigation of the Performance and Emission Values of the Samples Obtained by Adding New Types of Nanoparticles
(Maik Nauka/Interperiodica/Springer, 2022) Demirpolat, Ahmet Beyzade; Uyar, Muhammed Mustafa; Arslanoğlu, Hasan
In this study, poppy oil and canola oil were subjected to acid and base catalysed transesterification reactions and biodiesel fuels were obtained. In addition, tests of the additive-free state of standard diesel fuel and biodiesel were also performed for comparison. These fuels have been subjected to performance and emission tests in a direct injection three-cylinder diesel engine. These values are compared with the values of standard diesel fuel. According to the results obtained from engine tests, the biodiesel produced with poppy, canola oil, and nanoparticle additives generally showed similar properties with diesel fuel. In terms of volume, the increase in the biodiesel ratio in diesel fuel has been found to increase the specific fuel consumption and exhaust outlet temperature values. By using biodiesel-containing fuels, compared to diesel fuel, CO, HC, smoke emissions decreased, NOx, CO2, and O-2 increased. Biodiesel fuel samples with additives were obtained by adding a new type of CuO nanoparticle produced in the study to biodiesel-containing fuels. Comparison of the biodiesel samples and the fuel created by adding nanoparticles to these samples with the addition of nanoparticles, it has made a great contribution in the desired direction in the consumption of approximately 20% CO, 27% HC, 29% smoke (soot), and 16% specific fuel consumption. As an innovation to the literature, improvement in combustion and performance characteristics of biodiesel with nanoparticle additive, decrease in emission values and positive effect of this decrease on the environment were observed as a result of the study.
Manufacturing and characterization of waste polyethylene terephthalate-based functional composites reinforced with organic and inorganic fillers
(Taylor & Francis Inc, 2024) Deniz, Şermin; Aydoğmuş, Ercan; Kar, Filiz; Arslanoğlu, Hasan
Many fillers are employed as reinforcement in polymeric materials to improve their properties and reduce expenses. This research aims to improve the mechanical and thermophysical properties of waste polyethylene terephthalate (WPET). Using recycled materials is also one of the study's objectives in support of environmental preservation. Glass fiber (3 wt.%, 6 wt.%, 9 wt.%, and 15 wt.%), calcium carbonate (5 wt.%, 15 wt.%, and 25 wt.%), and corn starch (3 wt.%) have all been added to WPET in different ratios to create composite materials. The mechanical strength, Shore D hardness tests, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, and thermal, mechanical, physical, and chemical properties of these composites have all been investigated. It has been shown that while the amount of starch in the samples remains constant, the hardness increases as the amount of calcite and glass wool increases. The thermal conductivity does not significantly change as the ratio of glass fiber increases, notwithstanding a modest drop Nonetheless, the thermal conductivity values rise in tandem with the calcium carbonate (CaCO3) ratio.
Recycling of Labada (Rumex) biowaste as a value-added biosorbent for rhodamine B (Rd-B) wastewater treatment: biosorption study with experimental design optimisation
(Springer Heidelberg, 2023) Şenol, Zeynep Mine; Çentinkaya, Serap; Arslanoğlu, Hasan
Rhodamine B (Rd-B) is a highly toxic dye causing serious environmental and health issues. This study focussed on the development of a cost-effective and ecologically friendly remediation technique utilising Labada (Rumex), a readily available agricultural biowaste. Experimental design was applied for the first time to establish the parametric effects on the rhodamine B (Rd-B) biosorption and to optimise the process for the highest rhodamine B (Rd-B) removal. At the optimised conditions of 25 degrees C, 500 mg L-1 concentration, natural solution pH of 5.5-6.0, and 1 g L-1 dosage; the maximum biosorption capacity was 0.219 mol kg(-1). Using the results of physicochemical characterisation and rhodamine B (Rd-B) adsorption measurements, isotherm and kinetic models were made to predict performance towards rhodamine B (Rd-B) removal from water reliably. The rhodamine B (Rd-B) biosorption kinetic was best correlated to the pseudo-second-order, while the equilibrium to the Freundlich isotherm. These isotherm and kinetic models can be used to quickly screen among larger sets of possible adsorbents and guide the development of novel, highly efficient adsorbents for rhodamine B (Rd-B) removal from water. Characterisation of Labada (Rumex) was accomplished by scanning electron microscope (SEM-EDX), energy dispersive X-ray, Fourier transform infrared, and thermogravimetric analyses. Regeneration of exhausted Labada (Rumex) biosorbent was best performed using 50% hydrochloric acid. This study highlights the strong feasibility of Labada (Rumex) biosorption as a green and effective technique for Rd-B removal.
Production and characterization of microsphere reinforced polyester composite: Modeling of thermal decomposition with ANN and optimization studies by RSM
(Taylor & Francis Inc, 2024) Aydoğmuş, Ercan; Aydın, Muhammet; Arslanoğlu, Hasan
In this research, hollow inorganic microsphere (Q-cel) reinforced unsaturated polyester composite is produced, and its thermophysical properties have been characterized. The thermal decomposition kinetics of the composite obtained at different heating rates and various compositions are modeled using artificial neural networks. Also, the production optimization of the polyester composite has been evaluated using response surface methodology. The study has been repeated for certain heating rates (5, 10, and 20 K/min). Activation energies of polyester composites have been calculated using thermogravimetric data and kinetic methods. Changes in activation energy during the thermal decomposition (4 wt.% Q-cel, 94 wt.% UP, 580-660 K, and 20 K/min) of the composite are compared using FWO (129.4 kJ/mol), KAS (127.6 kJ/mol), and CR (126.5 kJ/mol). According to the results, it is seen that the activation energy goes up as the temperature and Q-cel ratio by the mass increase. When the amount of the filler in the polyester composite increases, the thermal conductivity coefficient also rises. As well as, it is determined that as Q-cel ratio in the mixture raises, the density of the composite decreases and Shore D hardness goes up.
Investigation of thermophysical properties of synthesized SA and nano-alumina reinforced polyester composites
(Taylor & Francis Inc, 2023) Sahal, Hakan; Aydoğmuş, Ercan; Arslanoğlu, Hasan
Synthesis and characterization of 4-[(E)-(5-bromo-2-hydroxybenzylidene) amino]-N-(4-methylpyrimidin-2-yl) benzenesulfonamide (SA) has been performed. Alumina (A1 2 0 3 ) and SA reinforced polyester composites are synthesized, and characterization processes are carried out. SA formed has been characterized by Fourier transform infrared (FTIR) spektrofotometre and nuclear magnetic resonance (NMR) spectroscopy. The thermal decomposition behavior of the nanocomposites in a nitrogen environment under non-isothermal conditions from 298 to 973 K is investigated with proportional-integral-derivative (P1D) system. Thermal conductivity, Shore D hardness, and thermal decomposition behaviors of the nanocomposites that are added with alumina filler and synthesized with SA reinforcement have been compared. Nano-alumina filler raises the thermal conductivity coefficient and Shore D hardness of the polyester composites. The addition of synthesized SA reduces both the thermal conductivity coefficient and Shore D hardness. The thermal conductivity coefficient has been measured at the lowest in the pure polyester (0.056 W/m.K), and highest in the nano-alumina reinforced composite (0.072 W/m.K). The lowest Shore D hardness (nearly 68) is determined in the synthesized SA reinforced composite. Also, the experimental study has been optimized with the help of response surface methodology (RSM), and the improved theoretical models have been evaluated by statistical analysis.
Investigation of Leaching Conditions and Leaching Kinetics of Oxidized Copper Ore Malachite at Atmospheric Pressure Using Tartaric Acid Solution
(Springer India, 2024) Türk, Feride N.; Arslanoğlu, Hasan
In this study, the dissolution conditions and dissolution kinetics of copper from malachite in the presence of organic acid (C4H6O6) as an organic leaching reagent were examined. The effects of particle size, acid concentration, time, solid/liquid ratio, temperature, and mixing speed on the dissolution process of copper were investigated. According to the test results, optimum dissolution conditions are as follows: particle size was 74 µm; organic acid concentration was 0.2 mol/L; duration was 60 min; solid/liquid ratio was 1/10; the temperature was determined as 25 °C and the stirring speed was 300 rpm; and the copper extraction value was obtained as 73.18% under optimum experimental conditions. Kinetic models were applied to the dissolution efficiencies obtained to determine the dissolution kinetics of copper in the presence of organic acid, and it was found that the dissolution process was controlled by the film diffusion model. In light of the data obtained, it can be said that organic acid, which is an economical and environmentally friendly leaching reagent, can be used in the dissolution of copper from malachite (Cu(OH)2CuCO3), as well as in the leaching of other precious metals such as copper, zinc, and cobalt from oxide and carbonate ores.

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