磁性氧化石墨烯/MIL-101(Fe)活化H_(2)O_(2)降解亚甲基蓝

Activation of hydrogen peroxide by magnetic graphene oxide/MIL-101(Fe) composites for degradation of methylene blue

针对MIL-101(Fe)活化H_(2)O_(2)降解亚甲基蓝(MB)效率低、难分离问题,采用水热合成法制备磁性氧化石墨烯/MIL-101(Fe)(MGO/MIL-101(Fe))。采用XRD、FESEM、FTIR、VSM和氮气吸附-脱附等方法对所制备材料进行了表征与分析。以MB为目标污染物,考察了pH、H_(2)O_(2)体积分数和MGO/MIL-101(Fe)投加量对MB降解性能的影响。结果表明,MGO/MIL-101(Fe)表面含有羧基、环氧基等含氧官能团,磁性能良好,饱和磁化强度为16.89 emu·g^(-1),具有超顺磁性;比表面积、平均孔容和平均孔径分别为84.72 m^(2)/g、0.25 cm^(3)/g和14.87 nm。当pH为3.5、H_(2)O_(2)体积分数为1%,MGO/MIL-101(Fe)投加量为0.05 g·L^(-1)时,MB的去除率为81.60%,且其稳定性和循环使用性能较好。在外加磁场作用下,MGO/MIL-101(Fe)可以作为易于分离的非均相类芬顿催化剂用于降解MB废水。

Magnetic graphene oxide/MIL-101(Fe)(MGO/MIL-101(Fe)) was prepared by hydrothermal synthesis method to solve the problem of low efficiency and difficult separation of methylene blue(MB) degradation by activation of H_(2)O_(2).The prepared materials were characterized and analyzed by XRD,FESEM,FTIR,VSM and N_(2) adsorption-desorption isotherms.MB was selected as target pollutant.The effects of pH,H_(2)O_(2) volume fraction and MGO/MIL-101(Fe) dosage on degradation performance of MB were investigated.The results show that the surface of MGO/MIL-101(Fe) contains oxygen-containing functional groups such as carboxyl group and epoxyl group,and has excellent magnetic properties and superparamagnetic properties.The saturation magnetization of MGO/Mil-101(Fe) is 16.89 emu·g^(-1).The specific surface area,average pore volume and average pore size are 84.72 mz/g,0.25cm^(3)/g and 14.87 nm,respectively.The removal rate of MB reaches 81.60%when pH is 3.5,H_(2)O_(2) volume fraction is 1%,MGO/MIL-101(Fe) dosage is 0.05 g·L^(-1) and its stability and recycling performance are favourable.Under an external magnetic field,MGO/MIL-101(Fe) can be easily separated as heterogeneous Fenton catalyst for degradation of MB wastewater.