光催化
木质素
材料科学
光化学
苯乙酮
键裂
苯酚
异质结
劈理(地质)
化学工程
催化作用
有机化学
化学
光电子学
复合材料
工程类
断裂(地质)
作者
Jin-Yu Wang,Zhong-Zhu Hu,Xin Sun,Yaqin Gao,Junlin Wang,Jie Xu,Jian Gan
标识
DOI:10.1016/j.surfin.2022.102505
摘要
Photocatalytic cleavage of lignin Cβ-O-4 bonds is a very effective method to promote the high-value utilization of lignin because lignin can provide a large number of aromatics. However, the higher carrier recombination rate severely inhibits the efficiency of photocatalytic cleavage of Cβ-O-4 bonds in lignin model compound. Here, heterojunction photocatalysts CdS-C3N4 were successfully synthesized through the photodeposition of different masses of CdS on the surface of C3N4. The obtained photocatalyst CdS-C3N4 can effectively break the lignin Cβ-O-4 bonds in 2-Phenoxy-1-phenylethanol (lignin model compound) and the products formed are mainly phenol (Phol) and acetophenone (Ap). More importantly, the yields of Phol and Ap were up to 86.5% and 74.3%, after only irradiation for 1.5 h, respectively, under optimum conditions. A mechanistic study showed that photocatalytic reaction follows a photogenerated electron-hole coupled mechanism. The high photocatalytic performance of CdS-C3N4 is mainly ascribed to the fast photogenerated electron-hole separation capability and good dispersion of CdS on C3N4. This work offers an idea for selective cleavage of lignin Cβ-O-4 bonds by constructing a heterojunction photocatalyst.
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