聚多巴胺活化的纤维素材料用于贵金属离子的回收及有机染料催化

Polydopamine Activation of Cellulose for Recovery of Noble-Metal Ions as Organic Dyes Nano-catalysts

以贻贝黏附蛋白多巴胺为改性剂，利用多巴胺的粘附性和自聚合性，在纤维素膜（CM）表面包覆聚多巴胺。利用聚多巴胺较强的吸附还原性在其表面负载上贵金属粒子，用于污水中有机染料的催化降解。利用Uv-vis、TEM、SEM对复合膜进行了分析表征。实验结果表明，随着聚多巴胺包覆时间的延长，对贵金属离子的吸附还原性增强，贵金属纳米颗粒的负载量随着反应温度增加而增加。在催化有机染料过程中，紫外线在200～700nm全波长扫描显示，以0．1M的NaBH4作为还原剂，在纤维素复合膜存在的条件下，有机染料的吸收峰在8min内逐渐减弱直至趋干平缓，溶液颜色变为无色。

Dopamine, as a modifier of adhesive proteins secreted by mussel, utilizing the properties of adhesion and self-polymerization can polymerize spontaneously coating on cellulose membrane （CM）.By the adsorption reducing of polydopamine,it can be loaded on the surface of noble metal nanoparticles used for catalytic degradation of organic dyes in wastewater. The composite membranes were characterized by Uv-vis ,TEM and SEM.The experimental results showed that the adsorption and reduction properties for noble metal ions were enhanced with the increased of the reaction time of the poly （ dopamine）, and also the loading capacity for noble metal nanoparticles increased with the increasing of the reaction temperature.In the catalytic process of organic dyes, Uv-vis scanning the wavelength between 200 - 700 nm displayed that using 0.1M NaBH4 as reducing agent in the presence of cellulose composite films as catalyst, the absorption peak of organic dyes in 8 min gradually weakened until becoming straight line, and finally the color of the solution became colorless.