Photocatalytic oxidation activity enhanced by iron-oxalate chelates for Fenton-like oxidation of As(III) in oxalate systems
Photocatalytic oxidation activity enhanced by iron-oxalate chelates for Fenton-like oxidation of As(III) in oxalate systems
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DOI：
10.1016/j.jece.2022.108232
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发表时间：
2022-07
影响因子：
7.7
通讯作者：
Jinglin Yin;Junliang Yang;Yanmei Li;Ziyang Xiang;Ting Yang;Jing Wang;Tao Xu;Qionghui Wang
中科院分区：
文献类型：
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作者：
Jinglin Yin;Junliang Yang;Yanmei Li;Ziyang Xiang;Ting Yang;Jing Wang;Tao Xu;Qionghui Wang
This study investigated the Fenton-like oxidation of As(III) by three types of iron oxides in oxalate systems. The effects of pH, oxalate concentration and atmosphere on the oxidation of As(III) by iron oxide photocatalyst were studied. Firstly, hydrothermal carbon (HTC) was used as the carrier to load three kinds of iron oxides to prepare new composite materials, including α–FeOOH, αsingle bondFe2O3and Fe3O4, which can solve the dispersion problem of iron oxide by using a large number of rich functional groups on the HTC surface. The experiment results showed that under the conditions of O2, pH = 5.0 and oxalate concentration of 0.5 mmol·Lsingle bond1, As(III) was completely oxidized by α–FeOOH and α–Fe2O3at 15 min and 20 min, respectively. Density functional theory (DFT) was used to study the surface adsorption energy of iron oxide and oxalate. The calculated results showed that the order of adsorption energy of three iron oxides for the oxalate is αsingle bondFeOOH > αsingle bondFe2O3> Fe3O4. FeIII(C2O4)+, a mononuclear bidentate iron oxalate chelate with the strongest photosensitivity, was constructed in the Fe-Oxalate system containing only Fe(III), resulting in the photocatalytic efficiency of α–FeOOH and αsingle bondFe2O3was superior to that of Fe3O4. These findings contribute to arsenic remediation of water bodies by using iron materials and oxalate in the natural environment.
