Performance and mechanism of adsorption of low concentration phosphate in water by Ce-Zr-Zn ternary composite adsorbent
WEI Ting1,, NIU Lijun1, ZHANG Guangming2,,, ZHANG Tao1,, ZHANG Yi3,, ZOU Zhiguo3 1.School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China 2.School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China 3.Shandong Public Holdings Tongtai Environment Co. Ltd., Jining 277200, China
Abstract:In order to alleviate the eutrophication problem, a novel Ce-Zr-Zn ternary composite adsorbent was synthesized by co-precipitation method for phosphate removal. The adsorption performance and proposed mechanisms of low concentration phosphate were investigated through the combination of XRD, SEM, BET, XPS and FT-IR characterization analysis. The results showed that the adsorbent had an excellent performance on phosphate removal with the removal rate above 96%, and the residual phosphate concentrations in the effluent were below 0.045 mg·L?1. The maximum phosphorus adsorption capacity was 66.61 mg·g?1. The phosphate adsorption process conforms to the pseudo-second-order kinetic model and Freundlich model. In addition, the adsorbent exhibited a wide pH range of 3~9 and a good selectivity toward phosphate. The mechanism analysis showed that ligand exchange and electrostatic interaction are the main phosphorus removal contributors. The above results can provide references for the application of this Ce-Zr-Zn ternary composite adsorbent to perform advanced phosphate removal in water. Key words:phosphate removal/ Ce-Zr-Zn/ adsorption performance/ mechanisms.
图1Ce-Zr-Zn吸附剂XRD图、氮气吸附脱附等温线及SEM图 Figure1.XRD pattern, N2 adsorption-desorption isotherm and SEM images of the Ce-Zr-Zn ternary composite adsorbent
图5初始pH对除磷效果的影响、不同pH条件下的磷酸盐的分布及比例和共存离子对除磷效果的影响 Figure5.Effects of initial pH on the phosphate removal performance, the distribution and ratio of phosphate species at different pH and effects of coexisting anions on the phosphate removal performance
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1.School of Environment & Natural Resources, Renmin University of China, Beijing 100872, China 2.School of Energy & Environmental Engineering, Hebei University of Technology, Tianjin 300130, China 3.Shandong Public Holdings Tongtai Environment Co. Ltd., Jining 277200, China Received Date: 2019-12-08 Accepted Date: 2020-03-01 Available Online: 2020-11-11 Keywords:phosphate removal/ Ce-Zr-Zn/ adsorption performance/ mechanisms Abstract:In order to alleviate the eutrophication problem, a novel Ce-Zr-Zn ternary composite adsorbent was synthesized by co-precipitation method for phosphate removal. The adsorption performance and proposed mechanisms of low concentration phosphate were investigated through the combination of XRD, SEM, BET, XPS and FT-IR characterization analysis. The results showed that the adsorbent had an excellent performance on phosphate removal with the removal rate above 96%, and the residual phosphate concentrations in the effluent were below 0.045 mg·L?1. The maximum phosphorus adsorption capacity was 66.61 mg·g?1. The phosphate adsorption process conforms to the pseudo-second-order kinetic model and Freundlich model. In addition, the adsorbent exhibited a wide pH range of 3~9 and a good selectivity toward phosphate. The mechanism analysis showed that ligand exchange and electrostatic interaction are the main phosphorus removal contributors. The above results can provide references for the application of this Ce-Zr-Zn ternary composite adsorbent to perform advanced phosphate removal in water.