作　　者： (吴宏海）; (张璇）; ;

机构地区： 华南师范大学

出　　处： 《华南师范大学学报（自然科学版）》 2021年第4期40-48,共9页

摘　　要： 通过引入铁氧化物并煅烧处理对蒙脱石进行优化设计,成功合成了铁柱撑蒙脱石复合催化剂(FPMt).采用X射线衍射(XRD)、热重分析(TG)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FT-IR)、N2吸附-脱附(BET)等分析方法对FPMt样品结构与表面性质进行表征,以邻硝基苯酚(2-NP,22μmol/L)作为代表性污染物研究FPMt的还原催化活性.结果表明:与蒙脱石相比,FPMt表面电子传输活性得到明显提高,原因是引入赤铁矿的FPMt吸附位点增多同时酸位减少,从而显著增强材料表面的还原催化活性.除溶液pH和Fe(Ⅱ)浓度外,催化剂的结构完整性、赤铁矿的结晶度等均为影响催化剂还原活性的重要因素.最后提出了FPMt表面络合态Fe(Ⅱ)的还原催化活性显著提高的介导机制. Iron-pillared montmorillonite composite catalyst(FPMt)was successfully synthesized by optimizing the design of montmorillonite through the introduction of iron oxides and the calcination treatment.The structural and surface properties of FPMt samples were characterized with X-ray diffraction(XRD),thermogravimetric analysis(TG),TEM,FT-IR,N2 adsorption and desorption isotherms,and 2-Nitrophenol(2-NP,22μmol/L)was used as a representative pollutant to identify the reduction catalytic activity of FPMt.The results showed that,compared to montmorillonite,the surface electron transport activity of FPMt was significantly improved due to the increase of adsorption sites of Fe(Ⅱ)and the corresponding reduction of acid sites on the surface of FPMt,significantly enhancing the reduction catalytic performance of the material.In addition to the solution pH and Fe(Ⅱ)concentration,the structural integrity of the catalyst and the crystallinity of hematite are important factors affecting the catalytic activity.Finally,a mediating mechanism for the significant increase in the reduction catalytic activity of complexed Fe(Ⅱ)on the surface of FPMt was proposed.

关 键 词： 铁柱撑蒙脱石 煅烧 亚铁 还原催化 邻硝基苯酚 赤铁矿

领　　域： [环境科学与工程—环境工程] [理学—物理化学] [理学—化学]