纳米CdS/纤维素复合材料光催化脱色刚果红染料研究

Study on photocatalytic decolorization of Congo Red solution with nanosized CdS/cellulose composites

采用低温仿生矿化技术,将纳米CdS粒子修饰到纤维素表面,制备得到纳米CdS/纤维素复合材料.研究了在可见光照射下催化剂的CdS含量、催化剂用量、刚果红染料初始质量浓度和溶液pH对纳米CdS/纤维素复合材料光催化脱色刚果红染料动力学的影响.结果表明:纳米CdS/纤维素复合材料光催化降解刚果红过程遵循Langmuir-Hinshelwood假一级反应动力学.光催化剂的最佳用量为0.5 g/L,刚果红溶液最佳pH=5,初始质量浓度为20 mg/L.在此条件下,纳米CdS/纤维素-0.1复合材料对刚果红溶液光催化脱色速率常数达到0.010 27 min-1,相应的半衰期为83.53 min.

Nanosized CdS/cellulose composites were prepared through modifying CdS particles onto cellu-lose surface using biomimetic mineralization technology at low temperature. The effects of CdS content of photocatalysts, photocatalyst dosage, initial Congo Red （CR） concentration and pH on the kinetics of decoloriza-tion of CR solution were investigated under visible light irradiation. The photocatalytic decolorization was found to follow a pseudo-first-order kinetics according to Langmuir-Hinshelwood （L-H） model. The optimal nano- sized CdS/cellulose-0.1 composites amount was 0.5 g/L. The optimal pH and initial concentration of CR solu-tion were 5 and 20 mg/L. These conditions resulted in a 0.010 27 min^-1 of decolorization rate constant and a 83.53 min of half-life.