落叶松单宁光催化降解机理研究（综述）
摘 要：本文论述了国内外光催化降解的研究进展，介绍了它们的催化机理。着重强调了以纳米二氧化钛为光触媒的催化降解并概述了各种光触媒材料的研究情况。论述了植物单宁的结构和应用，其中主要介绍了落叶松单宁，指出研究落叶松单宁光催化降解机理后将具备十分广阔的应用前景和其产生物取代石油基化学品的现实意义。
关键词：落叶松、单宁、二氧化钛、光催化降解
Study on the mechanism of photocatalytic degradation of larch tannin
ABSTRACT：This paper reviews the research progress of photocatalytic degradation at home and abroad, and introduces their catalytic mechanism. The catalytic degradation of nano-titanium dioxide as a photocatalyst is emphasized and the research situation of various photocatalyst materials is summarized. The structure and application of plant tannins are discussed. Among them, larch tannins are mainly introduced. It is pointed out that studying the photocatalytic degradation mechanism of larch tannins will have a very broad application prospect and the practical significance of its products replacing petroleum-based chemicals.
Key words: Larch, tannin, titanium dioxide, photocatalytic degradation
1、光催化
1.1光催化的起源和原理
众所周知，最初的地球环境不适合生物生存，后来光合细菌和植物开始用光合作用，用叶绿素作为催化剂，将无机物转化为有机物，它们花了近30亿年才结束了地球的恶劣环境，创造了地球生物发展的温床。这就是光合作用，而我们的光催化反应则将这个反应反过来了，即催化剂在光的作用下，将有机物转化成了无机物，这对补完自然界的物质循环过程具有巨大的意义。 [1]
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