Facile fabrication of Fe/Zr binary MOFs for arsenic removal in water:High capacity,fast kinetics and good reusability  

作　　者：Qi Guo Yuan Li Li-Wei Zheng Xiao-YangWei Yan Xu Yi-Wen Shen Ke-Gang Zhang Chun-Gang Yuan 

机构地区：[1]Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control,Department of Environmental Science&Engineering,North China Electric Power University,Baoding 071000,China [2]Wetland Research Center for Baiyangdian Lake,North China Electric Power University,Baoding 071000,China

出　　处：《Journal of Environmental Sciences》2023年第6期213-223,共11页环境科学学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(No.21777040);the Beijing Natural Science Foundation(No.8182051);the Fundamental Research Funds for the Central Universities(No.2017ZZD07).

摘　　要：A water-stable bimetallic Fe/Zrmetal-organic framework[UiO-66(Fe/Zr)]for exceptional decontamination of arsenic in water was fabricated through a facile one-step strategy.The batch adsorption experiments revealed the excellent performances with ultrafast adsorption kinetics due to the synergistic effects of two functional centers and large surface area(498.33 m^(2)/g).The absorption capacity of UiO-66(Fe/Zr)for arsenate[As(V)]and arsenite[As(III)]reached as high as 204.1 mg/g and 101.7 mg/g,respectively.Langmuir model was suitable to describe the adsorption behaviors of arsenic on UiO-66(Fe/Zr).The fast kinetics(adsorption equilibrium in 30min,10mg/L As)and pseudo-second-ordermodel implied the strong chemisorption between arsenic ions and UiO-66(Fe/Zr),which was further confirmed by DFT theoretical calculations.The results of FT-IR,XPS analysis and TCLP test demonstrated that arsenic was immobilized on the surface of UiO-66(Fe/Zr)through Fe/Zr-O-As bonds,and the leaching rates of the adsorbed As(III)and As(V)from the spent adsorbent were only 5.6%and 1.4%,respectively.UiO-66(Fe/Zr)can be regenerated for five cycles without obvious removal efficiency decrease.The original arsenic(1.0mg/L)in lake and tapwater was effectively removed in 2.0 hr[99.0%of As(III)and 99.8%of As(V)].The bimetallic UiO-66(Fe/Zr)has great potentials in water deep purification of arsenic with fast kinetics and high capacity.

关 键 词：ARSENIC Removal Metal-organic frameworks BIMETALLIC 

分 类 号：X52[环境科学与工程—环境工程]