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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。
A novel composite Pt-BiVO4 / FACs was prepared by metal organic deposition combined with photoreduction using industrial solid waste fly ash floating beads (FACs) as support. The materials were characterized by XRD, SEM, XPS and DRS. The results show that Pt is mainly dispersed in the free state on the surface of the material; Pt-BiVO4 is monoclinic phase; the absorption of the composite in the visible region is enhanced. Under the visible light irradiation with λ> 400nm, the photocatalytic degradation of methylene blue by the prepared materials was studied. The results show that the photocatalytic activity of Pt-BiVO4 / FACs samples is much higher than that of BiVO4 and BiVO4 / FACs, and the composite with 2wt.% Pt-BiVO4 / FACs shows the highest photocatalytic activity. The reaction rate constant (k1) is 6.6 times that of BiVO4 and 2.8 times that of BiVO4 / FACs. Due to its light hollow nature, the material floats on the surface of the water, allowing it to absorb light energy and facilitate catalyst recovery and reuse.