竹叶源介孔二氧化硅的制备及其对亚甲基蓝的光催化降解性能

Preparation of Mesoporous Silica from Bamboo Leaves and Its Photocatalytic Degradation for Methylene Blue

通过灰化、碱溶及模板法从废弃竹叶中制备了介孔纳米二氧化硅(SiO_(2)),研究了其对亚甲基蓝(methylene blue,MB)的光催化降解性能。通过X射线衍射法(X-ray diffraction method,XRD)、扫描电子显微镜(scanning electron microscope,SEM)和透射电子显微镜(transmission electron microscope,TEM)分析证明了制备的竹叶源SiO_(2)具有排列整齐的介孔结构。利用该材料对一定浓度的MB溶液进行降解研究,与无光照的对照组相比,有光照条件下的降解率最高,验证了竹叶源SiO_(2)具有光催化性。在6 h内,0.05 g竹叶源介孔SiO_(2)对初始浓度为0.02~0.10 mmol/L的MB的降解率能达到70%~100%,说明废弃竹子制备的SiO_(2)可用于染料废水中MB类染料的降解处理。

Mesoporous nano-SiO_(2) was prepared from waste bamboo leaves by ashing,alkali dissolution and template method,and its photocatalytic degradation for methylene blue(MB)was studied.The x-ray diffraction(XRD)analysis and scanning electron micro-scope(SEM),transmission electron misroscope(TEM)observation showed that SiO_(2) from bamboo leaves prepared by the above meth-od has a well-arranged mesoporous structure.The photocatalytic degradation of MB solution with a certain amount of this material was studied.It was found that the degradation efficiency of SiO_(2) with light was the highest compared with the control group of SiO_(2) without light,which verified the photocatalytic property of SiO_(2) from bamboo leaves.The degradation efficiencies of MB were reach 70%~100%for an initial concentration of 0.02~0.1 mmol/L with 50 mg mesoporous SiO_(2) within 6 h,indicating that SiO2 prepared from waste bamboo can be used for the degradation of MB dyes in dye wastewater.