Bi2WO6-Cu2S复合材料的制备及其有机物降解应用

针对传统光催化剂可见光利用率低下以及体相/界面光生电子-空穴复合严重难题，利用水热法制备二维结构的Bi₂WO₆纳米片，为进一步改善光吸收，基于能级匹配原则，通过水热法在二维Bi₂WO₆纳米片表面原位生长Cu₂S构建Bi₂WO₆-Cu₂S异质结，基于二维Bi₂WO₆纳米片优良的压电性能以及Bi₂WO₆-Cu₂S异质结良好的光吸收及载流子传输性能，构建光-电-压电三种效应协同催化体系，探索最优降解实验条件，并成功用于水中罗丹明B的降解中。结果表明在光-电-压电效应协同作用下，设计的Bi₂WO₆-Cu₂S对罗丹明B的降解率在40 min内达到87%,为利用光电催化和压电催化的协同作用设计独特的异质结结构开辟了一条新途径。

Fabrication of Bi2WO6-Cu2S heterostructures for piezo-photoelectric degradation of organic dye

Owing to the low visible-light utilization of traditional photocatalysts and the serious problem of photogenerated electron-hole recombination at the bulk/interface, two-dimensional Bi₂WO₆ nanosheets were prepared herein using the hydrothermal method. Based on the principle of energy-level matching, Cu₂S was grown on the surface of the two-dimensional Bi₂WO₆ nanosheets using the hydrothermal method to construct Bi₂WO₆-Cu₂S heterojunctions for improved light absorption. Based on the excellent piezoelectric properties of the nanosheets and the excellent optical absorption and carrier transport properties of the Bi₂WO₆-Cu₂S heterojunctions, a piezo-photoelectric synergistic catalytic system was constructed and the optimal degradation experimental conditions were explored. The Bi₂WO₆-Cu₂S material was successfully applied for the degradation of Rhodamine B(RhB) in water. The results showed that under the synergistic photoelectric-piezoelectric effect, the degradation rate of RhB by the designed Bi₂WO₆-Cu₂S reached 87% in 40 min. This study provides a new way for designing unique heterojunction structures via the synergistic action of photocatalysis and piezoelectric catalysis.