摘要
研究了用UV/草酸高铁铵/H2O2体系光降解一种碱性阳离子染料—碱性品红.考察了初始pH、H2O2浓度、草酸高铁铵浓度、碱性品红浓度对碱性品红降解率的影响.试验结果表明:碱性品红降解的最佳初始pH为1.60～2.20,最佳初始H2O2浓度为10.0mmol/L;草酸高铁铵的浓度在0.1～1.0mmol/L时,碱性品红的降解率随浓度的增大而增大;高于1.0mmol/L时,则降解率相差不大;碱性品红的初始浓度增大,降解率减小,而实际降解的浓度则增加;碱性品红的浓度在低和高时,降解动力学过程不一致;随降解的进行,碱性品红在可见光区的吸收峰迅速消失,而降解过程中形成的中间产物吸收峰却消失很慢.
Photodegradation of a basic anion dye-fuchsin basic by using ammonium ferric oxalate and H_2O_2 as a mediator in an aqueous medium was investigated. The influences of parameters such as H_2O_2, fuchsin basic and ammonium ferric oxalate concentration and initial pH, were evaluated. The experimental results indicates that the optimum pH range was 1.60～2.20, and the optimum H_2O_2 concentration was 10.0 mmol/L. The degradation ratio increased with the increasing concentration of ammonium ferric oxalate in the range from 0.1 to 1.0 mmol/L, but no significant increase in degradation ratio was observed when the concentration was above 1.0 mmol/L. When the concentration of fuchsin basic increased, the degradation ratio dropped, while the concentration of degraded fuchsin basic rised. When the concentration of fuchsin basic was low, the degradation followed first-order kinetics, but when it was high, the degradation could be fitted by zero-order kinetics. The absorbtion of fuchsin basic at 543 nm disappeared quickly, while the absorbtion of intermediates formed during the course of fuchsin basic dagradation at 298 nm vanished slowly.
出处
《华南师范大学学报（自然科学版）》
CAS
2005年第2期6-11,共6页
Journal of South China Normal University(Natural Science Edition)
