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分别将水合氧化铁/锆/铈3种纳米颗粒负载到强碱性阴离子交换树脂D201上,制备得到3种树脂基纳米复合材料HFO-201、HZO-201和HCO-201。3种纳米复合材料的比表面积、孔道结构等特征参数通过氮气吸附仪进行测定,并根据Brunauer-Emmett-Teller(BET)和Barrett-Joyner-Halenda(BJH)模型进行计算。通过静态吸附实验考察了各种材料对水中As(Ⅲ)的吸附性能,结果表明,与HFO-201和HZO-201相比较,载铈复合材料HCO-201除As(Ⅲ)表现出更高的吸附容量、更快的吸附速率及更好的吸附选择性;模拟实际污水除砷工艺,开展固定床动态吸附研究,HCO-201的有效处理体积可达2900BV,高于HFO-201和HZO-201的有效处理体积(300BV、1150BV),吸附饱和后的HCO-201纳米复合材料可以通过NaOH-NaCl混合溶液实现完全再生。通过X射线光电子能谱(XPS)初步分析,HCO-201除砷机理可能是负载的Ce先氧化As(Ⅲ)成As(V),再进行吸附,从而实现As(Ⅲ)的强化去除。
Three kinds of nanocomposites of HFO-201, HZO-201 and HCO-201 were prepared by loading three types of hydrated iron oxide / zirconium / cerium nanoparticles onto strong basic anion exchange resin D201, respectively The specific surface area, pore structure and other characteristic parameters were measured by a nitrogen adsorption apparatus and calculated according to Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) models. Adsorption properties of As (Ⅲ) in water were investigated by static adsorption experiments. The results showed that the As (Ⅲ) -supported cerium composite HCO-201 exhibited a higher content of As (Ⅲ) than that of HFO-201 and HZO-201 Adsorption capacity, faster adsorption rate and better adsorption selectivity; simulation of actual wastewater arsenic removal technology, to carry out fixed bed dynamic adsorption studies, HCO-201 effective processing volume up to 2900BV, higher than the HFO-201 and HZO-201 Effective treatment volume (300BV, 1150BV), HCO-201 nanocomposites after adsorption saturation can be fully regenerated by NaOH-NaCl mixed solution. According to the preliminary analysis of XPS, the mechanism of arsenic removal by HCO-201 may be that the supported Ce oxidizes As (V) to As (V) and then adsorbs to enhance the removal of As (III).