光催化降解木质素机理与影响因素的研究进展

Progress on Mechanism and Influencing Factors of Photocatalytic Degradation of Lignin

光催化降解木质素,使大分子木质素降解为小分子增值产品,是一种高效且环保的方法。文中首先综述了光催化降解木质素的作用机理,包括光生空穴(h_(VB)^(+))/电子(e_(CB)^(-)),·OH和O_(2)^(-)·的生成路径以及其各自对木质素β-O-4键断裂的作用机制;其次是反应pH,光催化剂种类、改良和用量,氧化剂种类、用量和与光催化剂组合对光催化降解木质素的影响;最后对光催化降解木质素进行了总结与展望。

Photocatalytic degradation of lignin and the degradation of macromolecular lignin into small mole-cule value-added products are efficient and environmental protection method.Firstly,the mechanism of photocata-lytic degradation of lignin was reviewed,including the formation path of photogenerated holes(h_(VB)^(+))/electrons(e_(CB)^(-)),·OH and O_(2)^(-)·and their respective action mechanisms onβ-O-4 bond breakage.Secondly,the influence on photocatalytic degradation of lignin includes reaction pH,type,improvement and dosage of photocatalyst,type and dosage of oxidant,and the combination between photocatalyst and oxidant was summarized.Finally,the photocata-lytic degradation of lignin was prospected.