How to facilitate photogenerated-carrier separation is an important step in developing excellent semiconductor photocatalysts for environmental pollutant removal. Herein, Ag₂MoO₄ (AMO) nanoparticles were assembled onto the surface of BiOBr (BOB) nanosheets to construct a highly efficient Z-scheme AMO/BOB heterojunction photocatalyst. Several analytical techniques were used to elucidate the characteristics and photocatalytic mechanism of the AMO/BOB heterojunction. Photodegradation experiments for removing methylene blue under simulated-sunlight irradiation reveal that a 20%AMO/BOB heterojunction exhibits excellent photodegradation activity with η(30 min) = 93.8% and k_app = 0.08638 min⁻¹, which were greater by 4.5 and 5.6 times in comparison with that of pure BOB and AMO, respectively. Based on the experimental and density functional theory (DFT) calculation results, it is proposed that the Z-scheme carrier transfer/separation mechanism dominates the enhanced photodegradation performance of the composite photocatalysts. Additionally, the potential application of AMO/BOB photocatalysts in degrading various organic pollutants (including organic dyes, antibiotics and other serious organic pollutants) was also investigated.

中文翻译：

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构建用于光催化去除有机污染物的 Z 型 Ag2MoO4/BiOBr 异质结

如何促进光生载流子分离是开发用于环境污染物去除的优良半导体光催化剂的重要一步。在此，将 Ag ₂ MoO ₄ (AMO) 纳米粒子组装到 BiOBr (BOB) 纳米片表面，构建高效 Z 型 AMO/BOB 异质结光催化剂。几种分析技术被用来阐明 AMO/BOB 异质结的特性和光催化机制。在模拟阳光照射下去除亚甲蓝的光降解实验表明，20%AMO/BOB 异质结具有出色的光降解活性，η (30 min) = 93.8% 和k _app = 0.08638 min ^-1，分别是纯 BOB 和 AMO 的 4.5 倍和 5.6 倍。基于实验和密度泛函理论（DFT）计算结果，提出Z型载流子转移/分离机制主导复合光催化剂增强的光降解性能。此外，还研究了 AMO/BOB 光催化剂在降解各种有机污染物（包括有机染料、抗生素和其他严重有机污染物）方面的潜在应用。