Removal of Arsenic from Wastewater by Using Nano Fe 3 O 4 /Zinc Organic Frameworks

Xuexia Huang, Yun Liu, Xinyi Wang, Linwei Zeng, Tangfu Xiao, Dinggui Luo, Jia Jiang, Hongguo Zhang (), Yuhui Huang, Mingzhen Ye and Lei Huang ()
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Xuexia Huang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Yun Liu: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Xinyi Wang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Linwei Zeng: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Tangfu Xiao: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Dinggui Luo: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Jia Jiang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Hongguo Zhang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Yuhui Huang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Mingzhen Ye: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
Lei Huang: School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China

IJERPH, 2022, vol. 19, issue 17, 1-15

Abstract: Efficient removal of arsenic in wastewater is of fundamental importance due to the increasingly severe arsenic pollution. In this study, a new composite adsorbent (Fe 3 O 4 @ZIF-8) for As(V) removal from wastewater was synthesized by encapsulating magnetic Fe 3 O 4 nanoparticles into metal organic frameworks. In order to evaluate the feasibility of Fe 3 O 4 @ZIF-8 as an adsorbent for As(V) removal, the adsorption properties of Fe 3 O 4 @ZIF-8 were systematically explored by studying the effects of dosage, pH, adsorption isotherm, kinetics, and thermodynamics. Additionally, the characterization of Fe 3 O 4 @ZIF-8 before and after adsorption was analyzed thoroughly using various tests including SEM-EDS, XPS, BET, XRD, TG, FTIR, and the properties and arsenic removal mechanism of the Fe 3 O 4 @ZIF-8 were further studied. The results showed that the Fe 3 O 4 @ZIF-8 has a specific surface area of 316 m 2 /g and has excellent adsorption performance. At 25 °C, the initial concentration of arsenic was 46.916 mg/L, and pH 3 was the optimum condition for the Fe 3 O 4 @ZIF-8 to adsorb arsenic. When the dosage of the Fe 3 O 4 @ZIF-8 was 0.60 g/L, the adsorption of arsenic by the Fe 3 O 4 @ZIF-8 can reach 76 mg/g, and the removal rate can reach 97.20%. The adsorption process of arsenic to the Fe 3 O 4 @ZIF-8 can be well described by the Langmuir isotherm model and the second-order kinetic equation. At pH 3 and temperature 298 K, the maximum adsorption capacity of arsenic by the Fe 3 O 4 @ZIF-8 was 116.114 mg/g. Through the analysis of thermodynamic parameters, it is proved that the adsorption process of arsenic by the Fe 3 O 4 @ZIF-8 is a spontaneous endothermic reaction. The Fe 3 O 4 @ZIF-8 has broad prospects for removing As(V) pollution in wastewater, because of its strong adsorption capacity, good water stability, and easy preparation.

Keywords: Fe 3 O 4 @ZIF-8; As(V); nano Fe 3 O 4; adsorption properties (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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