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| Sorption selectivity of metal cations on amino grafted palygorskite |
| Received:March 02, 2025 |
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| KeyWord:amino;palygorskite;sorption;selectivity |
| Author Name | Affiliation | E-mail | | CHEN Xilin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | GAO Xusheng | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | LIU Xiaomin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | SHU Yifei | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | HUANG Qingqing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | WANG Lin | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | SUN Yuebing | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | ZHAO Yujie | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | | | LIANG Xuefeng | Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs(MARA)/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Agro-Environment Protection Institute, MARA, Tianjin 300191, China | liangxuefeng@caas.cn |
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| Abstract: |
| To investigate the adsorption selectivity characteristics of amino grafted palygorskite（AGP）for various metal cations, this study conducted single-cation adsorption kinetics, isotherms, multi-cation competitive adsorption experiments, and X-ray photoelectron spectroscopy（XPS）analysis to examine the adsorption behavior of AGP towards eight metal cations（Cd2+, Cu2+, Zn2+, Ni2+, Mn2+, Fe3+, Pb2+, Hg2+）. The adsorption process of various metal cations on AGP can be described by a pseudo second order adsorption kinetics equation and Langmuir isotherm. The amino modification enhanced the adsorption of Pb2+, Zn2+, and Cd2+ by palygorskite, with the Pb2+ adsorption capacity increasing significantly by 82.9% compared to the original palygorskite, and the adsorption process was thermodynamically spontaneous. In the competitive adsorption of mixed solution systems with multiple coexisting metal cations, AGP exhibited efficient selective adsorption ability for Pb2+, with Fe3+ exhibiting the most significant inhibitory effect on Pb2+ adsorption, while the sorption of Fe3+ on AGP was mainly the contribution of palygorskite rather than the amino modification. XPS analysis indicated that the adsorption of metal cations on palygorskite mainly occurred through weak interactions of surface hydroxyl groups, while the selective adsorption mechanism of Pb2+ and Zn2+ on AGP was primarily through stronger amino complexation. The excellent selective adsorption performance of AGP for Pb2+ further enhanced its potential application in the selective treatment of heavy metal pollution, and provided theoretical support for the development of targeted adsorbents and immobilization amendments for Pb2+. |
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