非贵金属修饰可以有效增强单一半导体的光生电荷分离, 进而改善光催化活性。采用一种简单的抗坏血酸室温还原法制备了WO₃-Cu复合光催化材料, 并用不同表征手段对其组成和结构进行了表征。结果显示, Cu颗粒沉积在WO₃纳米立方的表面, 在模拟太阳光照射下, 与WO₃相比, WO₃-Cu复合材料具有良好的光催化降解刚果红的能力。活性物种捕捉实验以及顺磁共振结果表明, 光诱导产生的空穴、羟基自由基、超氧自由基阴离子等活性物种在刚果红降解过程中起主要作用。根据光电化学测试结果, WO₃在光催化过程中产生的电子快速转移向Cu颗粒, 可以有效分离光生电子-空穴对并加快光生载流子迁移, 进而有利于光催化反应的发生, 从而使WO₃表现出较高的光催化活性。

Non-noble metal decoration is a promising strategy for promoting semiconductor photocatalysis by effectively enhancing charge separation. Cube-like WO₃-Cu hybrid was successfully synthesized by a facile ascorbic acid reduction method at room temperature. The composition and morphology characterization showed that the Cu particle was deposited on the surface of WO₃ nanocube. The WO₃-Cu-1.0 hybrid (when 1.0 mmol CuSO₄∙5H₂O was involved into the reaction system) exhibited promoted photocatalytic capability towards Congo Red photodegradation under simulated sun light irradiation. The trapping experiments of active species during photocatalysis and ESR spectra of DMPO•OH signal of WO₃-Cu-1.0 composite confirmed that the photogenerated holes (h ⁺), •OH, and •O₂^-were the predominant active species during Conge Red degradation. Based on the photo/electro-chemical measurements, it was proposed that efficient charge transfer was accomplished between the WO₃ nanocube and Cu nanoparticles, which promoted electron-holes separation and subsequently photocatalysis reaction in the Congo Red solution. This work provides a facile preparation method for a binary photocatalyst system in which a semiconductor coupled with non-noble metal.