Fe(Ⅲ)/丙酮酸钠体系光解过程中生成的Fe(Ⅱ)浓度和·OH的浓度变化  

Concentration change of Fe(Ⅱ) and ·OH produced during photolysis of Fe(Ⅲ)-pyruvate system

作　　者：封享华[1] 丁世敏[1] 龙飞[1] 陈江科 封丽[1] 

机构地区：[1]长江师范学院化学化工学院,重庆408100

出　　处：《环境工程学报》2013年第8期3053-3058,共6页Chinese Journal of Environmental Engineering

基　　金：重庆市教委科学技术研究项目(KJ111311)

摘　　要：以日光灯和金属卤化物灯为主要光源,以Fe(Ⅲ)/丙酮酸钠体系光化学过程中产生的Fe(Ⅱ)和.OH为主要检测对象,探讨了Fe(Ⅲ)/丙酮酸钠体系光解过程中生成的Fe(Ⅱ)和·OH的浓度变化。结果表明,Fe(Ⅲ)/丙酮酸钠体系的光解过程不仅能产生Fe(Ⅱ)和·OH;在丙酮酸钠过量的情况下,光解过程还存在着Fe(Ⅲ)/Fe(Ⅱ)的循环;Fe(Ⅱ)浓度和·OH累积浓度均在pH 3.00时最大;体系的光化学过程中会伴随pH的升高;初始Fe(Ⅲ)浓度和初始丙酮酸钠浓度的提高都有利于Fe(Ⅱ)浓度和·OH累积浓度的提高。Concentrations of Fe（Ⅱ） and ·OH produced during photolysis of Fe（Ⅲ）-pyruvate complex were investigated utilizing fluorescent lamp and metal halide lamp as the primary light sources.The results show that Fe（Ⅱ） and ·OH can be produced during the photolysis of Fe（Ⅲ）-pyruvate,and a cycle of Fe（Ⅲ）/Fe（Ⅱ） exists when excessive pyruvate was in the system.The optimal pH was 3.00 for production of Fe（Ⅱ） and ·OH accumulated.pH of the system increased during irradiation.Increasing initial concentration of Fe（Ⅲ） and sodium pyruvate was helpful to increase the concentration of Fe（Ⅱ） and ·OH accumulated.

关 键 词：氢氧自由基 Fe(Ⅱ) Fe(Ⅲ) 丙酮酸钠 光化学 

分 类 号：X788[环境科学与工程—环境工程]