ABSTRACT

A novel ternary ZnO/CdS/GO heterostructure with boosting photocatalytic performance and stability was prepared by a simple hydrothermal method. The morphology, crystal structure, chemical composition and optical properties of the composite were thoroughly investigated. Results show that the obtained ZnO/2CdS/10GO composite exhibits the optimal activity towards RhB removal under sunlight irradiation, which is higher than that of pristine ZnO and CdS. The enhanced photocatalytic performance of the composite is attributed to the close heterostructure and excellent conductivity of GO. Besides, the radical trapping experiments revealed that superoxide radical (^•O₂⁻) and holes (h⁺) were the vital active species in the photocatalytic process. Meanwhile, the corresponding photocatalytic mechanism was also investigated. In all, this work supplies a facile route to design highly efficient and stable photocatalysts for water purification.

摘要

通过简单的水热法制备了一种具有提高光催化性能和稳定性的新型三元 ZnO/CdS/GO 异质结构。对复合材料的形貌、晶体结构、化学成分和光学性能进行了深入研究。结果表明，所获得的 ZnO/2CdS/10GO 复合材料在阳光照射下表现出最佳的 RhB 去除活性，高于原始 ZnO 和 CdS。复合材料增强的光催化性能归因于GO的紧密异质结构和优异的导电性。此外，自由基捕获实验表明，超氧自由基（^• O ₂ ^-）和空穴（h ⁺) 是光催化过程中的重要活性物质。同时，还研究了相应的光催化机理。总之，这项工作为设计高效稳定的水净化光催化剂提供了一条简便的途径。