Wei Yunxia, Li Wenlu, Miao Hong, Zhang Hanjie, Ma Mingguang
Provincial Key Laboratory of Gansu Higher Education for City Environmental Pollution Control, College of Chemistry and Chemical Engineering, Lanzhou City University Lanzhou 730070 P. R. China
Department of Chemistry, Tsinghua University Beijing 100084 P. R. China.
RSC Adv. 2018 Oct 15;8(62):35367-35373. doi: 10.1039/c8ra06304d.
BiWO@TCNQ visible light photocatalyst with a core-shell structure was synthesized by adsorption methods. The core-shell structure results in the fast transfer of photogenerated carriers, reduced carrier recombination and photogenerated holes on the HOMO level of TCNQ can be injected into the VB of BiWO under visible light irradiation, resulting in the direct oxidation of organic pollutants. The photocatalytic activity of BiWO@TCNQ was gradually enhanced with an increasing proportion of TCNQ. When the mass fraction of TCNQ reaches 0.5%, it exhibits the highest visible light activity. The apparent rate constant of BiWO@TCNQ-0.5% is almost 2.2 times as high as that of pure BiWO.
采用吸附法合成了具有核壳结构的BiWO@TCNQ可见光光催化剂。核壳结构使得光生载流子快速转移，减少了载流子复合，并且在可见光照射下，TCNQ的HOMO能级上的光生空穴能够注入到BiWO的价带中，从而实现有机污染物的直接氧化。随着TCNQ比例的增加，BiWO@TCNQ的光催化活性逐渐增强。当TCNQ的质量分数达到0.5%时，它表现出最高的可见光活性。BiWO@TCNQ-0.5%的表观速率常数几乎是纯BiWO的2.2倍。
