仿生矿化法制备壳聚糖/纳米CdS复合粒子对猩红B光催化降解研究

用仿生矿化法制备了壳聚糖/纳米CdS复合粒子，并用于可见光光催化降解猩红B染料模拟废水，系统地研究了染料初始浓度、pH值、催化剂投加量、光照情况和催化剂重复使用等因素对猩红B的光解脱色效率的影响。结果表明，当pH=3.0，催化剂投加量为0.7 g/L的条件下，对初始溶液为20 mg/L的猩红B模拟废水，60 min之内脱色率超过96%。酸性媒介比碱性媒介更有利于猩红B染料光解脱色。实验范围内Br^-、NO^-₃和Cl^-等无机阴离子，均对降解脱色有促进作用，其中NO₃^-对脱色作用促进最显著。处理前后的UV-Vis谱图分析表明猩红B在壳聚糖/纳米CdS复合粒子可见光光解处理过程中脱色是因为染料发生氧化光降作用。催化剂重复利用5次后，处理60 min对猩红B的脱色率仍可达到80.7%。

Study on photocatalytic decolourization of biebrich red by chitosan/nano CdS composite particle prepared by simulating bio-mineralization

The chitosan/nano CdS composite particle was prepared successfully by simulating bio-mineralization process.The photocatalytic decolourization of biebrich red using the catalyst was investigated under amplified sunlight illumination.The influences of initial concentrations of biebrich red,initial pH of the reaction system,dose of catalyst,different anions and the reusability of the catalyst on biebrich red decolorization efficiency were investigated.The experimental results indicated that the decolorization...