Isotherm and kinetic studies for the biosorption of cadmium from aqueous solution by Alhaji maurorum seed |
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| Institution: | 1. Environmental Engineering Department, KN Toosi University of Technology, Iran;2. Environmental Engineering Department, KN Toosi University of Technology, P.O. Box 1587-544-16, Tehran, Iran;3. University of Shahrood, Iran;1. Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City) , New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt;2. Electronic Materials Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, P.O. Box 21934, Alexandria, Egypt;3. Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, 163 Horrya Avenue, P.O. Box 832, Shatby, 21526 Alexandria, Egypt;1. Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China;2. National Engineering Research Center of Urban Environmental Pollution Control, Beijing Municipal Research Institute of Environmental Protection, 59 Xiaoyingfang Middle Street, Xicheng District, Beijing 100037, China;3. MCC Capital Engineering & Research Incorporation Limited, 7 Jian’an Street, Daxing District, Beijing 100176, China;1. Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology (YunTech), Yunlin64002, Taiwan, ROC;2. Department and Graduate School of Safety, Health, and Environmental Engineering, YunTech, Yunlin 64002, Taiwan, ROC;1. Universidade de Vigo, Departamento de Bioloxía Vexetal e Ciencia do Solo, Área de Edafoloxía e Química Agrícola, Facultade de Ciencias de Ourense, As Lagoas s/n, 32004 Ourense, Spain;2. Universidade de Santiago de Compostela, Departamento de Edafoloxía e Química Agrícola, Escola Politécnica Superior, Campus Univ. s/n, 27002 Lugo, Spain |
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| Abstract: | Cadmium is an extremely toxic metal commonly found in industrial regions. Anthropogenic activity is the most important factor causing its interference to water, soil and air resources. The aim of many researches is to present remediation strategy or to remove cadmium from contaminated resources through an economical and efficient method. Cadmium adsorption from aqueous solution using Alhaji maurorum seed adsorbent has been investigated and optimized in this study. Moreover, isotherm and kinetics of adsorption process was studied. The seeds are washed by distilled water after separation from the plant, and then dried in room temperature for 48 h. They are powdered by grinder and passed through sieve no.18 as well. Adsorption process was optimized in 4 steps regarding pH, contact time, adsorption dose and initial concentration of cadmium effects. The cadmium concentration in solution was measured using ICP-OES method. The results of optimization tests showed that the optimum condition of cadmium adsorption (85.5% removal) occurs at pH of 6.5 with 20 g/L of adsorption dose for 45 min. In addition, the efficiency of adsorption process increases as the cadmium concentration reduces in the initial solution. Adsorption process follows the pseudo second-order kinetics and Freundlich isotherm with correlation coefficients of 0.999 and 0.99, respectively. According to the findings of this analysis, it was concluded that A. maurorum seed is a good biological adsorbent for adsorbing cadmium from aqueous solution. |
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| Keywords: | Cadmium Adsorption kinetic Adsorption isotherm Modeling Freundlich isotherm |
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