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Volkan Eyupoglu,Recep Ali Kumbasar 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
In the present study, the synergistic extraction of Ni(II) from spent Cr–Ni electroplating bath solutions(SEBS) was determined using 5,8-diethyl-7-hydroxydodecan-6-one oxime(LIX 63) and 2-bromodecanoicacid(2BDA) by emulsion liquid membranes(ELM)s. The effect of membrane and aqueous phaseproperties on Ni(II) transport was experimentally investigated. Ni(II) extraction was obtained to behigher than 98.5% in the optimum conditions within 6 min. The higher separation factor (bNi/Cr) wasobtained as 677. In addition, Ni(II) extraction kinetics depends on LIX63 because the extraction kineticsof LIX63 is slower than 2BDA. Therefore, we have determined that 2BDA acts as a synergist in presentextraction system.
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Ahmet Surucu,Volkan Eyupoglu,Osman Tutkun 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.2
Cobalt and nickel are among the most important nonferrous metals. The using of flat sheet supported liquid membranes (FSSLMs) to remove metals from wastewaters has been used actively by the scientific and industrial communities. In this study, the selective separation of cobalt from thiocyanate solutions containing cobalt and nickel by FSSLM was examined using tri-n-octylamine (Alamine 300) as carrier. The FSSLM was consisted of extractant, flat sheet support and organic solvent. The various parameters were studied to determine the optimum extraction and striping conditions of cobalt and nickel. These parameters were stirring speeds of phases, NH4SCN concentration, pH, diluent type, extractant concentration, stripping reagent concentration and modifier concentration. Concentration of cobalt and nickel were determined by Shimadzu AA-6701GF spectrophotometer. In the optimum conditions,selective separation of cobalt was achieved with an efficiency of 98.4% within 8 h, for equimolar feed mixtures, 400 mg/L Co + 400 mg/L Ni, and the separation factor of Co(II) over Ni(II) was 234.4. In addition,for nonequimolar feed mixtures, 500 mg/L Co + 1000 mg/L Ni, Ni in excess, selective separation of cobalt was 99.9%, and the separation factor of Co was 506 in the same time.
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Soft computing techniques in prediction Cr(VI) removal efficiency of polymer inclusion membranes
Muhammad Yaqub,Beytullah EREN,Volkan Eyupoglu 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.3
In this study soft computing techniques including, Artificial Neural Network (ANN) and Adaptive Neuro-Fuzzy Inference System (ANFIS) were investigated for the prediction of Cr(VI) transport efficiency by novel Polymer Inclusion Membranes (PIMs). Transport experiments carried out by varying parameters such as time, film thickness, carrier type, carier rate, plasticizer type, and plasticizer rate. The predictive performance of ANN and ANFIS model was evaluated by using statistical performance criteria such as Root Mean Standard Error (RMSE), Mean Absolute Error (MAE), and Coefficient of Determination (R<SUP>2</SUP>). Moreover, Sensitivity Analysis (SA) was carried out to investigate the effect of each input on PIMs Cr(VI) removal efficiency. The proposed ANN model presented reliable and valid results, followed by ANFIS model results. RMSE and MAE values were 0.00556, 0.00163 for ANN and 0.00924, 0.00493 for ANFIS model in the prediction of Cr(VI) removal efficiency on testing data sets. The R2 values were 0.973 and 0.867 on testing data sets by ANN and ANFIS, respectively. Results show that the ANN-based prediction model performed better than ANFIS. SA demonstrated that time; film thickness; carrier type and plasticizer type are major operating parameters having 33.61%, 26.85%, 21.07% and 8.917% contribution, respectively.
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Ebru Sonmez,Fatih Sonmez,Recep Ali Kumbasar,Volkan Eyupoglu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.4
Selective and synergistic extraction of cadmium from acidic iodine solutions containing Cd2+, Co2+ and Ni2+using solvent extraction (SX) technique is presented in this study. The study has highlighted the importance of main and synergistic extractants composition. The mixtures have evident synergistic effects on Cd2+ with a synergistic enhancement factor of 2.22. The various experimental parameters were studied to determine the optimum extraction and stripping conditions of Cd2+. Under optimum conditions, the maximum extraction efficiency (99.7%) was achieved when using 1.5% (v/v) TIOA and 0.5%(v/v) TBP in dichloromethane within 5 min. Extracted Cd2+ was stripped effectively from the organic phase using 2.0 mol/L NaOH solution.
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