响应面法优化NaClO_2/UV降解藏红T及动力学研究

采用NaClO_2/UV降解藏红T染料废水,研究染料初始质量浓度、p H、NaClO_2投加量、UV照射时间对藏红T脱色率的影响及降解过程的动力学,应用响应曲面法优化得出最佳条件.通过紫外可见光谱及红外光谱分析,考察藏红T染料的矿化程度.结果表明,NaClO_2/UV能够有效降解藏红T,降解过程符合一级动力学,单个因素对藏红T降解效果的影响顺序为:p HUV照射时间初始质量浓度NaClO_2投加量.当p H为4.45、初始质量浓度为44.02 mg·L-1、NaClO_2投加量为136.54 mg·L-1、UV照射时间为19.40 min时,藏红T的脱色率达到97.31%.

Kinetics Study and Optimization of NaClO2/UV Treated Safranine T Based Response Surface Methodology

Safranine T was degraded by NaClO2/UV method. The effects of initial dye concentration, pH, NaClO2 dosage and UV irradiation time on Safranine T decolorization rate were studied, as well as the kinetics. The optimal condition was obtained using response surface methodology. Ultraviolet visible spectrum and infrared absorption spectrum were conducted to evaluate the mineralization of Safranine T. The results showed that NaClO2/UV can effectively degrade Safranine T and the degradation process follows first order kinetics. The effect order of four factors was pH >UV irradiation time > initial dye concentration > NaClO2 dosage. Under the optimum conditions that pH of 4.45, initial dye concentration of 44.02 mg.L-1, NaClO2 dosage of 136.54 mg.L-1, UV irradiation time of 19.40 min, decolorization rate of Safranine T reached to 97.31%.