普鲁士蓝对罗丹明B的光催化降解研究

Visible Light Catalytic Degradation of Rhodamine B in Fenton-like Reagent of Prussian Blue-H_2O_2 and Influences of Anions on Degradation Rate

用普鲁士蓝与过氧化氢作为类-Fenton试剂,在波长大于420 nm的可见光辐射下研究了罗丹明B的光催化降解规律。实验表明:普鲁士蓝与过氧化氢形成的Fenton体系对罗丹明B有显著的降解作用,在没有电解质存在下,9.0 mg·L-1的罗丹明B经过120 min的降解,其降解率达到64.0%,其降解动力学符合一级反应动力学方程。加入KNO3,KCl,KBr,K2SO4电解质后,反应速率有不同程度的影响,在保持钾离子浓度相同的情况下,阴离子对罗丹明B降解速率的影响从大到小的顺序是SO42->Br->Cl->NO3-,其中在0.05 mol·L-1硫酸钾溶液中40 min时罗丹明B的降解率达到了97.0%。

The photo-Fenton degradation of Rhodamine B was studied employing Prussian Blue and hydrogen peroxide as a Fenton-Like reagent under λ 420 nm visible light.Rhodamine B was effectively decomposed under visible irradiation and the degradation ratio reached 64.0% in 120 min when its initial concentration was 9.0 mg·L-1.Kinetic analysis showed the degradation reaction obeys the pseudo-first order reaction kinetic law.The addition of anions such as SO42-,Br-,Cl-,NO3-had different effects on the degradation rate for Rhodamine B.For example,the degradation ratio reached 97.0% in 9.0 mg·L-1 Rhodamine B solution containing 0.05 mol·L-1 K2SO4 in 40 min,the effective order was SO42-Br-Cl-NO3-.The promotion is very useful due to the presence of anions in practical events.