粘胶基沸石咪唑骨架材料的制备及其对染料的脱色

为提高沸石咪唑骨架材料(ZIF-8)对染料的脱色性能,以粘胶织物为基材,在其表面负载氧化石墨烯,再原位生长ZIF-8得到氧化石墨烯/ZIF-8粘胶基功能材料,然后还原得到还原氧化石墨烯(rGO)/ZIF-8功能材料。借助扫描电子显微镜、X射线衍射仪、傅里叶红外光谱仪等对功能材料进行表征,分析其在不同光源下对活性黑KN-B染料的光催化降解效果及光催化机制。结果表明:rGO/ZIF-8粘胶基功能材料在模拟太阳光下,对20 mg/L 的活性黑KN-B染料的脱色率在90 min时达到97.1%,其与太阳光反应产生的导带电子被水中的溶解氧捕获形成过氧阴离子自由基(·O ^2-),是使活性黑KN-B染料降解的主要活性物质;重复使用3次后, rGO/ZIF-8粘胶基功能材料对活性黑KN-B染料的脱色率保持在90%以上。

Preparation and decolorization of rayon based zeoliticimidazolate framework functional material

In order to improve the decolorization performance of zeoliticimidazolate framework material(ZIF-8)for dyes,reduced graphene oxide(rGO)/ZIF-8 rayon based functional materials were prepared by loading graphene oxide(GO)and ZIF-8 on rayon surface followed by reducing.The functional materials were characterized by scanning electron microscopy,X-ray diffraction,and Fourier transform infrared spectrometer.The photocatalytic degradation of Reactive Black KN-B dye by rGO/ZIF-8 rayon based functional material under different light sources was studied,and the photocatalytic mechanism was discussed.The results show that the decolorization ratio of rGO/ZIF-8 rayon based functional material for Reactive Black KN-B dye is 97.1%,and the superoxide anion radical(·O2-)produced by the reaction between the functional material and sunlight are captured by dissolved oxygen in water,which is the main active substance to degrade Reactive Black KN-B.After being reused for three times,the decolorization ratio of Reactive Black KN-B dye remains to be more than 90%.