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Synthesis of one-dimensional hierarchical Bi2O3 with enhanced photocatalytic reduction of Cr(VI) and degradation of organic compounds under simulated sunlight
Applied Surface Science ( IF 6.3 ) Pub Date : 2023-10-05 , DOI: 10.1016/j.apsusc.2023.158623
Yi Zhang , Yuchen Li , Yin Peng , Jinyun Liu

A one-dimensional (1D) hierarchical Bi2O3 is obtained by calcining hierarchical Bi2O2CO3. Hierarchical Bi2O3 exhibits good photocatalytic activity. Results show that 50 mg/L of Cr(VI) solution, 50 mg/L of tetracycline and 40 mg/L of biphenol A can be photodegraded in 10, 10 and 20 min under simulated sunlight with an apparent rate constant value of 0.331, 0.179 and 0.214 min−1, respectively. This enhanced photocatalytic performance is mainly ascribed to special hierarchical structure and the more negative CB position. Radical capture and EPR measurements all prove the superoxide (O2) radical is the major active species for photocatalytic reaction. The transient photocurrent responses, PL emission and electrochemical impedance indicate 1D hierarchical Bi2O3 displays an improved separation efficiency of photogenerated e-h pairs. These findings would inspire many research for developing high-performance catalysts using under simulated sunlight.

中文翻译:


在模拟阳光下增强光催化还原 Cr(VI) 和降解有机化合物的一维多级 Bi2O3



通过煅烧分层 Bi2O2CO3 获得一维 (1D) 分层 Bi2O3。多级 Bi2O3 表现出良好的光催化活性。结果表明,在模拟阳光下,50 mg/L Cr(VI) 溶液、50 mg/L 四环素和 40 mg/L 双酚 A 可在 10、10 和 20 分钟内光降解,表观速率常数值分别为 0.331、0.179 和 0.214 min-1。这种增强的光催化性能主要归因于特殊的分层结构和更负的 CB 位置。自由基捕获和 EPR 测量都证明超氧化物 (O2−) 自由基是光催化反应的主要活性物质。瞬态光电流响应、PL 发射和电化学阻抗表明 1D 多级 Bi2O3 显示出光生 e-h 对的分离效率提高。这些发现将激发许多研究,以开发在模拟阳光下使用高性能催化剂。
更新日期:2023-10-05
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