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Cu-doped ZnO as efficient photocatalyst for the oxidation of arsenite to arsenate under visible light
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2018-07-19 , DOI: 10.1016/j.apcatb.2018.07.026
V. Vaiano , G. Iervolino , L. Rizzo

In this work, photocatalytic oxidation of As(III) to As(V) by ZnO photocatalyts doped with Cu was investigated under visible light. Photocatalysts were successfully prepared by precipitation method. The obtained samples were characterized by N2 adsorption at −196 C, X-Ray fluorescence analysis, X-ray diffraction, Raman spectroscopy, scanning electron microscopy and UV–vis reflectance analysis. In particular, according to XRD analysis, all samples showed an hexagonal wurtzite structure with average crystallite sizes approximately in the range 32–33 nm. The doping with Cu allowed to obtain a decrease of band gap energy from 3.2 eV, typical of pure ZnO, to 2.92 eV. Photocatalytic oxidation tests under visible light showed that undoped ZnO is not able to oxidize the As(III) present in solution, while the complete conversion of As(III) to As(V) was achieved in the presence of Cu doped ZnO photocatalyst. The best photocatalytic activity was observed with ZnO doped with 1.08 mol% of Cu (1.08Cu_ZnO), within 120 min of exposure to visible light irradiation. The same result was observed under solar simulated radiation. Photocatalytic tests were carried out also in real drinking water and complete oxidation of As(III) to As(V) by 1.08Cu_ZnO photocatalyst was achieved in 120 min under both visible light (emitted by LEDs) and solar simulated radiation.



中文翻译:

铜掺杂ZnO作为可见光下砷氧化为砷的有效光催化剂

在这项工作中,研究了在可见光下Zn掺杂的ZnO光催化剂将As(III)光催化氧化为As(V)。通过沉淀法成功制备了光催化剂。获得的样品的特征在于N 2。在-196 C时进行吸附,X射线荧光分析,X射线衍射,拉曼光谱,扫描电子显微镜和UV-vis反射率分析。特别是,根据XRD分析,所有样品均显示出六方纤锌矿结构,平均晶粒尺寸约为32-33 nm。铜的掺杂可以使带隙能量从3.2 eV(纯ZnO的典型值)降低到2.92 eV。可见光下的光催化氧化测试表明,未掺杂的ZnO不能氧化溶液中存在的As(III),而在Cu掺杂的ZnO光催化剂的存在下,As(III)完全转化为As(V)。在暴露于可见光的120分钟内,掺杂1.08 mol%的Cu(1.08Cu_ZnO)的ZnO观察到最佳的光催化活性。在太阳模拟辐射下也观察到了相同的结果。在真实的饮用水中也进行了光催化测试,并且在可见光(由LED发射)和太阳模拟辐射下,在120分钟内实现了1.08Cu_ZnO光催化剂将As(III)完全氧化为As(V)。

更新日期:2018-07-19
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