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| Adsorption performance of cadmium onto shell powder |
| Received:April 20, 2017 |
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| KeyWord:shell powder;cadmium;adsorption capacity;influence factor |
| Author Name | Affiliation | E-mail | | LUO Wen-wen | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | XU Ying-ming | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | WANG Nong | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | CAI Yan-ming | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | SUN Yue-bing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agricultural, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Tianjin Key Laboratory of Agro-Environment and Agro-Product, Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | sunyuebing@aepi.org.cn |
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| Abstract: |
| To study the adsorption mechanisms and the optimum adsorption conditions of Cd2+ onto shell powder, batch experiments were conducted to investigate the effects of initial Cd2+ concentration, adsorbent dose, pH, temperature, time, and ionic strength on Cd2+ adsorption onto the shell powder. The results showed that the adsorption of Cd2+ onto the shell powder rapidly increased and then decreased gradually with the increase of sorption agent under different initial Cd2+ concentration, and the adsorption fitted well to pseudo-first-order and pseudo-second-order kinetics. The isothermal adsorption was well described by the Temkin isotherm and the Langmuir isotherm. The adsorption process of Cd2+ was a spontaneous and endothermic reaction that achieved adsorption equilibrium in only 30 min, and the maximum equilibrium adsorption capacity was 161.75 mg·g-1. The adsorption of Cd2+ onto the shell powder increased with increasing pH, and then stabilized when the pH was ≥ 5. With increasing concentrations of Ca2+ and Mg2+, the adsorption properties of the shell powder gradually decreased, with maximum reductions of 15.19% and 14.44%, respectively, compared with the control group. |
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