聚吡咯/纳米SiO_2复合材料的制备及氧化性能  

Preparation and Oxidative Property of Polypyrrole/Nano-SiO_2 Composite

作　　者：吴小华[1] 康秋红[1] 钱方明[1] 蒋莉莉[1] 方克鸣[1] 

机构地区：[1]浙江师范大学化学与生命科学学院,金华321004

出　　处：《高分子学报》2015年第5期596-601,共6页Acta Polymerica Sinica

基　　金：浙江省自然科学基金(基金号LY12B05001)资助项目

摘　　要：采用化学氧化法制备聚吡咯/纳米Si O2(PPy/n Si O2)复合材料,通过扫描电子显微镜和红外光谱对其进行表征,并将其应用到对苯二酚的氧化反应中.结果表明,PPy/n Si O2复合材料中,PPy较均匀地负载在纳米Si O2表面.在弱酸性介质中,PPy/n Si O2对对苯二酚具有很好的氧化性能.反应2 h内,对苯二酚的氧化过程符合表观一级反应动力学.结合紫外-可见光谱法分析表明,聚吡咯通过与对苯二酚之间的氢键相互作用形成聚吡咯活性中间体,将对苯二酚氧化为对苯醌,聚吡咯具有氧化剂和催化剂的双重功能.Polypyrrole/nano-SiO2 composite （PPy/nSiO2） was prepared by chemical oxidative polymerization and characterized by SEM and FTIR techniques. It was used for oxidative degradation of hydroquinone. The results showed that polypyrrole was loaded on the surface of nano-SiO2 evenly. With nSiO2 used as the carrier, agglomeration phenomenon of polypyrrole could be effectively inhibited. As compared with PPy, PPy/nSiO2 exhibited high oxidative property for hydroquinone in weak acid solutions, and the degradation process was in line with the rule of the apparent first-order kinetics within 2 h. The results of UV-Visihle spectroscopy showed that hydroquinone was oxidized to be benzoquinone by the polypyrrole reactive intermediates,which was formed between hydroquinone and polypyrrole by hydrogen bond interactions. After recovery treatment of PPy/nSiO2 , oxidation removal of hydroquinone on PPy/nSiO2 within 120 min was 84.1% under the same conditions. Polypyrrole had a dual function both as the catalyst and the oxidant for oxidative degradation of hydroquinone.

关 键 词：聚吡咯 二氧化硅 对苯二酚 氧化 紫外-可见光谱法 

分 类 号：TB331[一般工业技术—材料科学与工程]