Abstract

We have synthesized oxide composites based on TiO₂ modified with aliovalent cations, W⁶⁺, Co³⁺, Cu²⁺, and Fe³⁺, in the range 5–30 wt %. Its deviation from stoichiometry is increased by active generation of Ti³⁺ cations during vacuum calcination at temperatures from 500 to 800°C. The photocatalytic activity (PCA) of the composites for dye degradation reactions under illumination with visible light exceeds that of analogous samples calcined in air. The PCA of the synthesized materials is an intricate function of their composition and structure. The highest PCA, which considerably exceeds the PCA of TiO₂ of similar origin and that of the commercially available Degussa P-25 TiO₂, is offered by the optimal compositions of the W- and Cu-modified samples for ferroin and methylene blue degradation and the Co- and Fe-modified samples for aniline degradation.

中文翻译：

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非化学计量二氧化钛基复合材料的合成，性能和可见光光催化活性

摘要

我们已经合成了基于TiO _2的氧化物复合材料，该复合材料经5-30 wt％的重金属阳离子W ⁶⁺，Co ³⁺，Cu ²⁺和Fe ³⁺改性。通过在500至800°C的温度下真空煅烧过程中主动生成Ti ³⁺阳离子，可增加其与化学计量比的偏差。复合材料在可见光照射下对染料降解反应的光催化活性（PCA）超过了在空气中煅烧的类似样品的光催化活性。合成材料的PCA是其组成和结构的复杂功能。最高的PCA，大大超过TiO ₂的PCA具有相似来源和市售Degussa P-25 TiO _2的样品，由W和Cu改性的样品对铁蛋白和亚甲蓝的降解以及Co和Fe改性的样品对苯胺的降解的最佳组成提供。