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纳米TiO₂光催化降解碱木质素研究

Research on Degradation of Alkali Lignin by Nano Titanium Dioxide Photocatalysis

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【Author】 CHEN Yun-ping1,2,FU Yan-bin3,YANG Ping1,CHEN Li1,CHENG Xian-su2(1.Department of Chemistry and Chemical Engineering,Minjiang University,Fuzhou 350108,China;2.College of Material Science and Engineering,Fuzhou University,Fuzhou 350002,China;3.Fujian Environmental Monitoring Central Station,Fuzhou 350003,China)

【机构】闽江学院化学与化学工程系；福州大学材料科学与工程学院；福建省环境监测中心站；

【摘要】通过纳米TiO2光催化氧化降解碱木质素,发现在木质素5g,催化剂用量为0.75g/L、光照时间为2.5h和pH值为10时,降解率可达70%以上。利用GC-MS对降解产物进行分析,结果表明,木质素本身具有复杂的结构形式,降解过程主要是进攻木质素侧链上的羰基和双键,使其发生氧化反应,改变结构或将侧链碎解。经过降解后可以得到紫丁香基衍生物、香草醛、愈创木基衍生物等小分子物质。更多还原

【Abstract】 The degradation rate of alkali lignin was over 70% at the condition of lignin 5g,the dosage of catalyst 0.75g/L,illumination time 2.5 h and pH value 10 by nano titanium dioxide photocatalysis. The GC-MS analysis results showed the structure of lignin was complex. In the process of degradation of alkali lignin,the aromatic structure and the side chain were preferential oxidized or broken. The degradation products were vanilla,guaiacyl derivative and other small molecula substances.更多还原