PDF(Pubmed)
Abstract：
The efficient separation of photogenerated charge carriers and strong oxidizing properties can improve photocatalytic performance. Here, we combine the construction of a tightly connected S-scheme heterojunction with the exposure of an active crystal plane to prepare g-C3N4/BiOBr for the degradation of high-concentration organic pollutants. This strategy effectively improves the separation efficiency of photogenerated carriers and the number of active sites. Notably, the synthesized g-C3N4/BiOBr displays excellent photocatalytic degradation activity towards various organic pollutants, including methylene blue (MB, 90.8%), congo red (CR, 99.2%), and tetracycline (TC, 89%). Furthermore, the photocatalytic degradation performance of g-C3N4/BiOBr for MB maintains 80% efficiency under natural water quality (tap water, lake water, river water), and a wide pH range (pH = 4-10). Its excellent photocatalytic activity is attributed to the tight connection between g-C3N4 and BiOBr in the S-scheme heterojunction interface, as well as the exposure of highly active (001) crystal planes. These improve the efficiency of the separation of photogenerated carriers, and maintain their strong oxidation capability. This work presents a simple approach to improving the separation of electrons and holes by tightly combining two components within a heterojunction.
摘要：
光生电荷载流子的有效分离和强氧化性能可以提高光催化性能。这里,我们将紧密相连的S方案异质结的构造与活性晶体平面的暴露相结合，以制备g-C3N4/BiOBr，用于降解高浓度有机污染物。该策略有效地提高了光生载流子的分离效率和活性位点的数量。值得注意的是,合成的g-C3N4/BiOBr对各种有机污染物表现出优异的光催化降解活性，包括亚甲蓝(MB，90.8%），刚果红(CR，99.2%)，和四环素（TC，89%）。此外，g-C3N4/BiOBr对MB的光催化降解性能在自然水质(自来水，湖水,河水)，和宽pH范围（pH=4-10）。其优异的光催化活性归因于S方案异质结界面中g-C3N4和BiOBr之间的紧密连接，以及高活性（001）晶面的曝光。这些提高了光生载流子的分离效率，并保持其强大的氧化能力。这项工作提出了一种简单的方法，通过在异质结内紧密结合两种成分来改善电子和空穴的分离。
