摘要
以工业固体废弃物粉煤灰漂珠(FACs)为载体,采用金属有机沉积法联合光还原法制备了新颖的复合材料Pt-BiVO4/FACs。利用XRD、SEM、XPS和DRS等手段对材料进行了表征。结果表明:Pt主要以游离态分散在材料的表面;Pt-BiVO4为单斜相结构;复合材料在可见光区的吸收增强。在λ>400nm的可见光照射下,研究了所制备的材料光催化降解亚甲基蓝的效能。研究发现:同BiVO4、BiVO4/FACs样品相比,Pt-BiVO4/FACs样品的光催化活性大为提高,其中2wt.%Pt-BiVO4/FACs的复合材料显示了最高的光催化效能,其一级反应速率常数(k1)是BiVO4的6.6倍,是BiVO4/FACs的2.8倍。由于漂珠质轻中空的特性,该材料可漂浮于水面,既能充分吸收光能,又利于催化剂的回收和重复利用。
In order to use visible light more effectively in photocatalytic reactions,novel fly ash cenospheres supported Pt-BiVO4 composite （Pt-BiVO4/FACs） photocatalysts were prepared by modified metalorganie decomposition process, followed by photochemical reduction. The composites were characterized by X-ray diffraction （XRD） ,scanning electron microscope （SEM） ,X-ray photoelectron spectra （XPS）, and UV-vis diffused reflectance spectroscopy （DRS） techniques. The results indicated that the visible light absorption of the composite was greatly enhanced. The Pt element was present in the metallic form and dispersed in the composite samples. Photocatalytic activities of the composite were evaluated by the methylene blue （MB） degradation under visible light irradiation. The results indicated that the photocatalytic efficiency was significantly improved after the Pt species was loaded and the 2 wt% Pt-loaded composite showed the highest photocatalytic activity. Moreover, the present study provided a useful strategy to design heterogeneous catalysis,in which catalytic materials were supported on fly ash eenospheres,an industrial solid waste produced from coal-firing power plants.
出处
《化工新型材料》
CAS
CSCD
北大核心
2014年第11期73-75,78,共4页
New Chemical Materials
基金
中国博士后科学基金(2012M511254)
江苏省教育厅自然科学研究项目(12KJD610004)
