Adsorption of strontium from aqueous solution using activated carbon produced from textile sewage sludges |
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| Institution: | 1. Pamukkale Univ, Higher Vocational School Denizli, Chem Programme, TR-20070 Denizli, Turkey;2. Ege University Institute of Nuclear Sciences, 35100 Bornova-Izmir, Turkey;1. Institut Charles Gerhardt de Montpellier, UMR-5253, CNRS-UM-ENSCM C. C. 1502, Place Eugène Bataillon, 34095 Montpellier cedex 5, France;2. Material Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, Tunisia;1. State Scientific Institution \"Institute for Single Crystals\", National Academy of Sciences of Ukraine Prosp. Nauki, 60, Kharkiv 61178, Ukraine;2. Kazimierz Pulaski University of Technology and Humanities in Radom, Stasieckiego Str. 54, 26–600 Radom, Poland;3. Institute for Single Crystals, National Academy of Sciences of Ukraine Prosp. Nauki, 60, Kharkiv 61178, Ukraine;1. Department of Environmental Health Engineering, School of Health, Ilam University of Medical Sciences, Ilam, Iran;2. Department of Environmental Health Engineering, School of Public Health, Arak University of Medical Sciences, Arak, Iran;3. Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran;1. Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science, Tianjin University of Science and Technology, Tianjin 300457, PR China;2. Department of Chemistry & Biochemistry, Laurentian University, Sudbury, ON P3E2C6, Canada;1. Advanced Environmental Biotechnology Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, 637141, Singapore;2. School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore |
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| Abstract: | Different types of activated carbons were prepared by changing the activation temperatures (400–700 °C) and impregnation ratio (sewage sludge: KOH; 1:1, 1:2) and the removal of Sr+2 from aqueous solution was determined. The maximum adsorption yield (12.11 mg/g) was obtained at 500 °C for 1 h carbonization conditions with impregnation ratio of 1:1. The affecting parameters were analyzed by using central composite design method. The selected parameters were initial pH, temperature, initial strontium concentration and carbon dosage. The analysis of variance was performed in 95% confidence level and checked to fitting of experimental value and predicted value. The significant F was P < 0.05 with a model F value of 19.94 which revealed that this regression is statistically significant. The results of regression analysis indicated that pH and temperature parameters were not individually statistically significant for Sr+2sorption. However, the efficiency of strontium sorption increases with the increase in carbon dosage and decreases with the Sr+2 concentration. Influences of initial pH and temperature, pH and Sr+2 concentration, temperature and carbon dosage and Sr+2 concentration and carbon dosage on the adsorption process were considered statistically significant. Adsorption of strontium was described by Freundlich isotherm as a physical adsorption (E = 7.2 kJ/mol). The adsorption reactions were calculated as endothermic, spontaneous and favorable reactions. |
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