Shen Huidong, Fu Feng, Xue Wenwen, Yang Xiaoxia, Ajmal Saira, Zhen Yanzhong, Guo Li, Wang Danjun, Chi Ruan
Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, PR China.
Shaanxi Key Laboratory of Chemical Reaction Engineering, College of Chemistry and Chemical Engineering, Yan'an University, Yan'an 716000, PR China.
J Colloid Interface Sci. 2021 Oct;599:741-751. doi: 10.1016/j.jcis.2021.04.122. Epub 2021 Apr 28.
In this work, we designed a novel BiMoO/BiMoO homojunction photocatalyst and successfully fabricated by a facile solvothermal-calcination approach. Experimental characterizations indicated that the formation of BiMoO/BiMoO homojunction was caused by controlling oxygen vacancies formation. Such BiMoO/BiMoO homojunction exhibits about 240 times higher photocatalytic activity towards phenol degradation as compared with pure BiMoO under visible light irradiation. Similarly, for a co-existed phenol and Cr(VI) model system, BiMoO/BiMoO-catalyzed the photodegradation of phenol and the reduction of Cr(VI) simultaneously occur, and BiMoO/BiMoO homojunction also displays a superior photocatalytic activity, that is 4 and 8 times higher than pure BiMoO, respectively. The remarkably boosted photocatalytic activity could be attributed primarily to the highly efficient separation of photogenerated electrons/holes due to the homojunction and the synergistic effect between phenol oxidation and Cr(VI) reduction. Thus, the present insight provides an effective strategy for designing and preparing highly active photocatalysts with the incorporation of oxygen vacancies modulation and applying for environmental remediation.
在本工作中，我们设计了一种新型的BiMoO/BiMoO同质结光催化剂，并通过简便的溶剂热-煅烧方法成功制备。实验表征表明，BiMoO/BiMoO同质结的形成是由控制氧空位的形成所致。与纯BiMoO相比，这种BiMoO/BiMoO同质结在可见光照射下对苯酚降解的光催化活性高出约240倍。同样，对于共存的苯酚和Cr(VI)模型体系，BiMoO/BiMoO催化苯酚的光降解和Cr(VI)的还原同时发生，并且BiMoO/BiMoO同质结也表现出优异的光催化活性，分别比纯BiMoO高4倍和8倍。显著提高的光催化活性主要归因于由于同质结导致的光生电子/空穴的高效分离以及苯酚氧化和Cr(VI)还原之间的协同效应。因此，本研究为设计和制备具有氧空位调控并应用于环境修复的高活性光催化剂提供了一种有效策略。
