ABSTRACT

The Ag₂O/TiO₂ composite photocatalysts (PCs) were synthesised in a facile manner into applied photocatalytic decomposition of methylene blue (MB) dye under visible-light treatment. Then, physicochemical belongings of as-fabricated PCs were analytically categorised by powder XRD, FT-IR, HRSEM with an EDXS, HRTEM, UV-Vis DRS and PL spectroscopy. Associated with the pristine TiO₂ and Ag₂O, the united Ag₂O/TiO₂ NC exposed greater photo-decomposition actions (~95.4%) in MB dye under visible-light treatment. The photo-degradation rate constant of Ag₂O/TiO₂ heterostructured composite was about 0.03504 min⁻¹, which is almost 1.8 and 1.2 times superior to pristine TiO₂ and Ag₂O NPs, individually. Besides, the as-fabricated Ag₂O/TiO₂ NC exhibits high reutilising stability for the next five consecutive consumptions. Hence it proposes that the liability for strong visible-light fascination capacity, narrow bandgap, effectual separation and hindered the recombination of photo-excited electron-hole (e⁻/h⁺) pairs by the construction of greatly dispersed Ag₂O NPs.

摘要

Ag ₂ O/TiO ₂复合光催化剂（PCs）以一种简便的方式合成到可见光处理下亚甲蓝（MB）染料的光催化分解中。然后，通过粉末 XRD、FT-IR、HRSEM 和 EDXS、HRTEM、UV-Vis DRS 和 PL 光谱对制成的 PC 的物理化学成分进行分析分类。与原始的 TiO ₂和 Ag ₂ O 相关，联合的 Ag ₂ O/TiO ₂ NC 在可见光处理下在 MB 染料中暴露出更大的光分解作用（~95.4%）。_{Ag 2} O/TiO ₂异质结构复合材料的光降解速率常数约为0.03504 min ^-1，这几乎分别是原始 TiO ₂和 Ag ₂ O NPs 的 1.8 和 1.2 倍。此外，制备的Ag ₂ O/TiO ₂ NC 在接下来的五次连续消耗中表现出很高的再利用稳定性。因此，它提出通过构建高度分散的Ag ₂ O NPs ，具有强可见光迷人能力，窄带隙，有效分离和阻碍光激发电子-空穴（e ^- /h ^{+ ）对的重组的责任。}