Abstract：
Y2O3 is a cost-effective and environmentally friendly wide-band gap photocatalyst with extensive application potential. However, its limited ability to be excited by visible light restricts its practical uses. In this study, we coupled the narrow bandgap semiconductor AgI with Y2O3 to form a Z-scheme heterostructure, significantly promoting its photocatalytic degradation activity. Characterization and experimental results demonstrated the formation of Y-O-Ag bonds through coupling with AgI, leading to an increase in oxygen vacancies in Y2O3, which promotes the chemisorption of H2O and O2. The Y-O-Ag bond introduction promotes electron transfer, improves hole utilization, and boosts energy transfer efficiency, thus promoting the efficient generation of ·OH and 1O2. The photocatalytic degradation rates of RhB and o-nitrophenol by 7.5% AgI/Y2O3 were 26.5 and 4 times higher than those of pure Y2O3, respectively. This study provides theoretical support for the Z-scheme heterojunction to improve photocatalytic activity and offers efficient solutions and practical design ideas for sewage purification.
摘要：
Y2O3是一种经济高效、环境友好的宽带隙光催化剂，具有广泛的应用潜力。然而,它被可见光激发的能力有限，限制了它的实际应用。在这项研究中,我们将窄带隙半导体AgI与Y2O3耦合形成Z方案异质结构，显著促进其光催化降解活性。表征和实验结果表明，通过与AgI耦合形成Y-O-Ag键，导致Y2O3中的氧空位增加，从而促进H2O和O2的化学吸附。Y-O-Ag键的引入促进了电子转移,提高孔的利用率，提高了能量转移效率，从而促进·OH和1O2的高效生成。7.5％AgI/Y2O3对RhB和邻硝基苯酚的光催化降解率分别比纯Y2O3高26.5和4倍。本研究为Z型异质结提高光催化活性提供了理论支持,为污水净化提供了高效的解决方案和实用的设计思路。
