PHOSPHORUS REMOVAL PERFORMANCE AND MECHANISM IN WATER OF ZINC IRON HYDROTALCITE MODIFIED RED MUD

ZHANG Heng; LI Yao; ZHAO Cong; HUANG Tao; PENG Daoping; CHEN Xing

doi:10.13205/j.hjgc.202402007

Volume 42 Issue 2

Feb. 2024

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ZHANG Heng, LI Yao, ZHAO Cong, HUANG Tao, PENG Daoping, CHEN Xing. PHOSPHORUS REMOVAL PERFORMANCE AND MECHANISM IN WATER OF ZINC IRON HYDROTALCITE MODIFIED RED MUD[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 57-65. doi: 10.13205/j.hjgc.202402007

Citation:

ZHANG Heng, LI Yao, ZHAO Cong, HUANG Tao, PENG Daoping, CHEN Xing. PHOSPHORUS REMOVAL PERFORMANCE AND MECHANISM IN WATER OF ZINC IRON HYDROTALCITE MODIFIED RED MUD[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(2): 57-65. doi: 10.13205/j.hjgc.202402007

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PHOSPHORUS REMOVAL PERFORMANCE AND MECHANISM IN WATER OF ZINC IRON HYDROTALCITE MODIFIED RED MUD

doi: 10.13205/j.hjgc.202402007

Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China

Received Date: 2022-12-10
Available Online: 2024-04-28

Abstract

Abstract

To solve the problem of excessive phosphorus in water, Zn/Fe-LDHs modified red mud(ZFRM) was prepared by coprecipitating Zn/Fe-LDHs onto the surface of red mud(RM) under alkaline conditions, and used to remove phosphate from wastewater. The phosphate removal performance and mechanism of Zn/Fe-LDHs modified red mud were studied by kinetic experiments, thermodynamic experiments, and regeneration experiments, combined with SEM, BET, XRD, and FTIR characterization. The results showed that the adsorption process of ZFRM to phosphorus conformed to the quasi-second-order kinetic model and Langmuir adsorption isotherm model. At 45 ℃, the maximum adsorption capacity was 56.26 mg/g, and the adsorption reaction was spontaneous and entropy-increasing endothermic reaction. The phosphorus removal capacity of ZFRM was less affected by pH. Carbonate ions coexisting in water can inhibit phosphorus adsorption. In the regeneration experiment, the adsorption capacity of ZFRM after 4 regenerations was 19.07 mg/g, and still had good adsorption performance. In addition, lamellar zinc iron hydrotalcite had been successfully coated on the surface of the flocculent red mud, forming a developed pore structure, and significantly increasing the specific surface area. The adsorption mechanism mainly included ion exchange, coordination reaction, and electrostatic action. Compared with other phosphorus removal materials, the synthesized ZFRM had high phosphorus removal efficiency, strong reproducibility, cheap raw materials, and simple synthesis process. It was a highly effective phosphorus removal agent with great potential in application.
- red mud,
- Zn/Fe-LDHs,
- phosphate,
- adsorption,
- hydrotalcite

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References(43)

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