Environmental Science and Technology Research Center, Department of Environmental Health Engineering, School of Public Health, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
Department of Environmental Health Engineering, School of Health, Rafsanjan University of Medical Sceiences, Rafsanjan, Iran.
Chemosphere. 2018 Sep;207:303-312. doi: 10.1016/j.chemosphere.2018.05.106. Epub 2018 May 18.
The efficiency of photocatalytic oxidation process in arsenite (As(III)) removal from contaminated water by a new FeO-MnO nanocomposite under UV radiation was investigated. The effect of nanocomposite dosage, pH and initial As(III) concentration on the photocatalytic oxidation of As(III) were studied by experimental design. The synthesized nanocomposite had a uniform and spherical morphological structure and contained 49.83% of FeO and 29.36% of MnO. Based on the experimental design model, in photocatalytic oxidation process, the effect of pH was higher than other parameters. At nanocomposite concentrations of more than 12 mg L, pH 4 to 6 and oxidation time of 30 min, photocatalytic oxidation efficiency was more than 95% for initial As(III) concentration of less than 500 μg L. By decreasing pH and increasing the nanocomposite concentration, the photocatalytic oxidation efficiency was increased. Furthermore, by increasing the oxidation time from 10 to 240 min, in addition to oxidation of As(III) to arsenate (As(V)), the residual As(V) was adsorbed on the FeO-MnO nanocomposite and total As concentration was decreased. Therefore, FeO-MnO nanocomposite as a bimetal oxide, at low doses and short time, can enhance and improve the efficiency of the photocatalytic oxidation and adsorption of As(III) from contaminated water resources. Furthermore, the energy and material costs of the UV/FeO-MnO system for photocatalytic oxidation of 1 mg L As(III) in the 1 L laboratory scale reactor was 0.0051 €.
采用新型 FeO-MnO 纳米复合材料在紫外辐射下对受污染水中亚砷酸盐（As(III)）的光催化氧化过程的效率进行了研究。通过实验设计研究了纳米复合材料用量、pH 值和初始 As(III)浓度对 As(III)光催化氧化的影响。合成的纳米复合材料具有均匀的球形形态结构，含有 49.83%的 FeO 和 29.36%的 MnO。基于实验设计模型，在光催化氧化过程中，pH 的影响大于其他参数。在纳米复合材料浓度高于 12mg/L、pH 值为 4 到 6 和氧化时间为 30min 的条件下，初始 As(III)浓度低于 500μg/L 时，光催化氧化效率大于 95%。通过降低 pH 值和增加纳米复合材料浓度，可以提高光催化氧化效率。此外，通过将氧化时间从 10 分钟增加到 240 分钟，除了将 As(III)氧化为砷酸盐（As(V)）之外，残留的 As(V)被吸附在 FeO-MnO 纳米复合材料上，总砷浓度降低。因此，FeO-MnO 纳米复合材料作为一种双金属氧化物，在低剂量和短时间内，可以增强和提高光催化氧化和吸附受污染水源中 As(III)的效率。此外，UV/FeO-MnO 系统用于在 1L 实验室规模反应器中光催化氧化 1mg/L As(III)的能量和材料成本为 0.0051 欧元。
