【摘要】 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.更多还原

【Abstract】 Nanosized CdS/cellulose composites were prepared through modifying CdS particles onto cellulose 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 decolorization 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 nanosized CdS/cellulose-0.1 composites amount was 0.5 g/L. The optimal pH and initial concentration of CR solution were 5 and 20 mg/L. These conditions resulted in a 0.010 27 min-1of decolorization rate constant and a 83.53 min of half-life.更多还原