Materials Reports  2021, Vol. 35 Issue (Z1): 530-535 |
| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| Adsorption of Ni(Ⅱ) in Water by Aluminum Sludge Loaded with Hydrous Ferric Oxides and Chitosan |
| LIU Shan1,2, LIAO Lei1,2, JIANG Cuiting1,3, LI Xuanni1,2, CAO Lei1,2, ZHAO Chunpeng1,2
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1 School of Water and Environment,Chang'an University, Xi'an 710054, China
2 Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang'an University, Xi'an 710054, China
3 Bureau of Ecology Environment of Dazhou, Dazhou 635000, China |
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Abstract Aluminum sludge (AlS) was modified with hydrous ferric oxides (HFO) and chitosan (CS) to prepare compound adsorbent AlS-HFO-CS, which was used to adsorb Ni(Ⅱ). The effects of pH, temperature, adsorption equilibrium time and competing ions on the adsorption of AlS-HFO-CS were studied.The morphology of the adsorbent was characterized by XRD, FTIR and SEM methods and the adsorption mechanism of Ni(Ⅱ) was discussed. The results showed hydrous ferric oxides and chitosan can be successfully loaded on aluminum sludge. The adsorption capacity of Ni(Ⅱ) increases with the increase of pH. Without considering the precipitation, the optimal adsorption pH is 5—6. The adsorption equilibrium time is 4 h. The Langmuir and Freundlich models have similar fitting effects on the adsorption of Ni(Ⅱ) by AlS-HFO-CS. The adsorption process may involve both single-layer chemical adsorption and multi-layer physical adsorption. The kinetics of the adsorption process is more in line with the pseudo-first order kinetics. The fitting results of the intra-particle diffusion model show that the intra-particle diffusion and boundary layer diffusion control the adsorption rate together. The adsorption is a spontaneous and endothermic process. There is competition in the adsorption process. The adsorption of Ni(Ⅱ) by the adsorbent is affected by Cr(Ⅵ) and Cu(Ⅱ).
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Published: 16 July 2021
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| Fund:Natural Science Foundation of China (51778057). |
| About author:: Shan Liu, born in Xi'an, Shaanxi Province, is an as-sociate professor and master's supervisor of Chang'an University. She is mainly engaged in water pollution control technology research and environmental impact assessment. Cuiting Jiang, born in Liangping, Sichuan Province, graduated from Chang'an University, now works at Bureau of Ecology Environment of Da Zhou and is engaged in water pollution control research. |
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