Lignin is an abundant but underutilized biomass resource on Earth. Cleavage of the lignin C–C bond is one of the main strategies for achieving high-value utilization of lignin. In recent years, photocatalytic technology has been widely used to cleave lignin C–C bonds. In particular, graphitic carbon nitride-based (GCN-based) photocatalysts have received increasing attention for their ability to photocatalytically cleave lignin C–C bonds. This review offers a thorough overview of the following three elements. (1) The design principles of GCN-based photocatalysts for photocatalytic cleavage of lignin C–C bonds were discussed in detail. (2) The effects of radicals, electronic structures, π-conjugation effects, and surface properties on the photocatalytic cleavage of lignin C–C bonds were comprehensively analyzed. (3) The mechanisms involved in the photocatalytic breaking of lignin C–C bonds were also summarized in detail. Finally, we also discuss the potential and future challenges of using GCN-based photocatalysts for breaking lignin C–C bonds.

中文翻译：

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氮化碳基光催化剂在木质素 C-C 键裂解中的研究进展：材料设计与解理机 Scheme


木质素是地球上一种丰富但未得到充分利用的生物质资源。木质素 C-C 键的裂解是实现木质素高价值利用的主要策略之一。近年来，光催化技术已被广泛用于裂解木质素 C-C 键。特别是，石墨氮化碳基 （GCN 基） 光催化剂因其光催化裂解木质素 C-C 键的能力而受到越来越多的关注。这篇评论对以下三个要素进行了全面概述。（1） 详细讨论了基于 GCN 的光催化剂用于光催化裂解木质素 C-C 键的设计原理。（2） 综合分析了自由基、电子结构、π共轭效应和表面性质对木质素 C-C 键光催化裂解的影响。（3） 还详细总结了光催化破坏木质素 C-C 键的机制。最后，我们还讨论了使用基于 GCN 的光催化剂破坏木质素 C-C 键的潜在和未来挑战。