摘要
考察pH值、温度、H2O2、Cu(Ⅱ)和Fe(Ⅱ)添加量对Cu(Ⅱ)-Fe(Ⅱ)-H2O2催化氧化降解甲基橙(MO)的影响。提出了羟基自由基降解甲基橙的机理,并通过数据处理得到了甲基橙的降解动力学模型。研究结果表明:Cu(Ⅱ)和Fe(II)对甲基橙的降解存在协同催化效应,处理200 mL质量浓度为1.5 g/L的甲基橙模拟废水的最佳催化氧化条件为:pH 3.0,温度60℃,过氧化氢(体积分数30%)10 g/L,硫酸铜4.0 g/L,硫酸亚铁0.1 g/L,反应速率常数0.943 min-1;Cu(Ⅱ)-Fe(Ⅱ)-H2O2催化体系对甲基橙的降解速率高,5 min即可实现对甲基橙的完全降解。
The effects of pH value, temperature, and the quantities of H2O2, Cu（ Ⅱ ） and Fe（ Ⅱ ） on the degradation efficiency of Cu（ Ⅱ ）-Fe（ Ⅱ ）H2O2 for methyl orange（MO） were investigated, and the synergetic catalytic effects of Cu（ Ⅱ ） and Fe（ Ⅱ ） on the catalytic oxidation for methyl orange were found. The mechanism of producing hydroxyl radicals by Cu（ Ⅱ ） or Fe（ Ⅱ ） and its catalytic oxidation mechanism for methyl orange were proposed, and the overall oxidation dynamic equation was obtained. The results show that the optimum conditions of degrading 200 mL methyl orange simulated wastewater are obtained as follows： the concentration of 1.5 g/L, pH 3.0, temperature 60 ℃, H2O210.0 mg/L, CuSO4 4.0 g/L and FeSO4 0.1 g/L. The constant of reaction rate is 0.943 min^-1. The degradation rate of Cu（ Ⅱ ）-Fe（ Ⅱ ）H2O2 for methyl orange is high, i.e. methyl orange can be completely degraded within 5 min.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第3期480-485,共6页
Journal of Central South University:Science and Technology
基金
国家高技术研究发展计划资助项目(20060102Z2009)
国家自然科学基金资助项目(20376034)
江苏省自然科学基金资助项目(BK2006181)
江苏省省级污染防治专项资金资助项目(2006-1-W-19)
关键词
催化氧化
甲基橙
铜
亚铁
过氧化氢
反应速率常数
catalytic oxidation
methyl orange
copper
ferrous
hydrogen peroxide
constant of reaction rate
