Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Department of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, Department of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China.
J Colloid Interface Sci. 2016 Mar 15;466:388-99. doi: 10.1016/j.jcis.2015.12.054. Epub 2015 Dec 29.
Highly-efficient photocatalyst based on Bi2WO6/SnS heterostructure was prepared via a surface functionalization method using 3-mercaptopropionic (MPA) as the surface functionalizing agent. Compared to bare Bi2WO6 and SnS nanoparticles, the as-formed Bi2WO6/SnS heterostructure exhibits enhanced photocatalytic activity for the degradation of Rhodamine B (Rh B). Photoluminescence and photocurrent measurements demonstrate that the enhanced photocatalytic activity during the photocatalytic process is closely related to the enhanced electron-hole separation efficiency. The photocatalytic activity of the as-formed Bi2WO6/SnS heterostructure can be perfectly remained even after being used for five times, showing excellent durability during the photocatalytic process. The influence of pH and inorganic ions are systematically investigated. And the optimum pH for the photocatalytic process is determined to be 6. The addition of chloride ion will exert negative effect on the photodegradation process of Rh B. The mechanism of photodegradation process was investigated by exploring the quenching effects of different scavengers and the results suggest that the reactive holes play the major role in the photodegradation process of Rh B.
采用巯基丙酸（MPA）作为表面功能化试剂，通过表面功能化方法制备了基于 Bi2WO6/SnS 异质结构的高效光催化剂。与纯 Bi2WO6 和 SnS 纳米粒子相比，形成的 Bi2WO6/SnS 异质结构表现出增强的光催化活性，可用于 Rhodamine B（Rh B）的降解。光致发光和光电流测量表明，在光催化过程中增强的光催化活性与增强的电子-空穴分离效率密切相关。形成的 Bi2WO6/SnS 异质结构的光催化活性即使在使用五次后也能完美保留，在光催化过程中表现出优异的耐久性。系统研究了 pH 值和无机离子的影响。确定光催化过程的最佳 pH 值为 6。氯离子的加入会对 Rh B 的光降解过程产生负面影响。通过探索不同猝灭剂的猝灭效应研究了光降解过程的机理，结果表明，反应性空穴在 Rh B 的光降解过程中起主要作用。
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