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| Study of adsorption characteristics of Pb2+ on montmorillonite-rice husk bio-charcoal composites |
| Received:July 09, 2018 Revised:October 12, 2018 |
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| KeyWord:rice husk charcoal;montmorillonite;intercalation composite;lead adsorption |
| Author Name | Affiliation | E-mail | | XIE Sha | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, 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 | | | LUO Wen-wen | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, 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 Agriculture, 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 Agriculture, 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 | | | SUN Yue-bing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, 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: |
| Batch experiments were carried out to study the adsorption properties of Pb2+ on montmorillonite-rice husk carbon composites, and the effect of influencing factors such as the adsorbent dosage, coexisting ions, and pH on Pb2+ sorption was investigated.The results showed that the adsorption of Pb2+ was more consistent with the pseudo-second-order kinetic model.The isothermal adsorption of Pb2+ on composites could be well fitted with the Freundlich isothermal model, and the adsorption process was a spontaneous endothermic reaction based on physical adsorption.With an increase in adsorption time, the adsorption capacity of Pb2+ increased rapidly at first and then decreased gradually before, finally reaching the adsorption equilibrium.With an increase in the adsorbent dosage, the Pb2+ removal rate increased.The highest Pb2+ adsorption performance on the composites was observed at a pH of 5, and the adsorption capacity reached 52.79 mg·g-1.The presence of different concentrations of Ca2+ and Mg2+ in the solution inhibited Pb2+ adsorption, and the inhibitory effect of Mg2+ was stronger. |
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