Li Yuanyuan, Wu Meijun, Wang Yaoqiong, Yang Qimei, Li Xiaoyan, Zhang Bin, Yang Dingfeng
Department of Biological and Chemical Engineering, Cooperative Innovation Center of Lipid Resources and Children's Daily Chemicals, Chongqing University of Education, Chongqing, China.
College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, China.
Front Chem. 2020 Feb 11;8:75. doi: 10.3389/fchem.2020.00075. eCollection 2020.
The design of highly efficient and stable photocatalysts to utilize solar energy is a significant challenge in photocatalysis. In this work, a series of novel heterojunction photocatalysts, LiSnO/g-CN, was successfully prepared via a facile calcining method, and exhibited superior photocatalytic activity toward the photodegradation of Rhodamine B solution under visible light irradiation as compared with pure LiSnO and g-CN. The maximum kinetic rate constant of photocatalytic degradation of Rhodamine B within 60 min was 0.0302 min, and the composites still retained excellent performance after four successive recycles. Chemical reactive species trapping experiments and electron paramagnetic resonance demonstrated that hydroxyl radicals (·OH) and superoxide ions ( ) were the dominant active species in the photocatalytic oxidation of Rhodamine B solution, while holes (h) only played a minor role. We demonstrated that the enhancement of the photocatalytic activity could be assigned to the formation of a junction photocatalytic system, which benefitted the efficient separation of photogenerated carriers. This study provides a visible light-responsive heterojunction photocatalyst with potential applications in environmental remediation.
设计高效稳定的光催化剂以利用太阳能是光催化领域的一项重大挑战。在本工作中，通过简便的煅烧方法成功制备了一系列新型异质结光催化剂LiSnO/g-CN，与纯LiSnO和g-CN相比，其在可见光照射下对罗丹明B溶液的光降解表现出优异的光催化活性。60分钟内罗丹明B光催化降解的最大动力学速率常数为0.0302 min⁻¹，且复合材料在连续四次循环后仍保持优异性能。化学反应活性物种捕获实验和电子顺磁共振表明，羟基自由基(·OH)和超氧离子( )是罗丹明B溶液光催化氧化中的主要活性物种，而空穴(h⁺)仅起次要作用。我们证明光催化活性的增强可归因于形成了异质结光催化体系，这有利于光生载流子的有效分离。本研究提供了一种在环境修复中具有潜在应用的可见光响应型异质结光催化剂。
