环境化学
李克斌,罗倩,魏红,张涛,陈经涛.Cu2+/吡啶/H2O2对直接大红4BE的快速脱色研究[J].环境科学学报,2010,30(11):2242-2249
Cu2+/吡啶/H2O2对直接大红4BE的快速脱色研究
- Rapid decolorization of direct red 4BE by Cu(Ⅱ)/pyridine/H2O2
- 基金项目：陕西省教育厅科学研究计划项目(No09JK757)
- 作者
- 单位
- 李克斌
- 西北大学化学与材料科学学院/合成与天然功能分子化学教育部重点实验室, 西安 710069
- 罗倩
- 西北大学化学与材料科学学院/合成与天然功能分子化学教育部重点实验室, 西安 710069
- 魏红
- 西安理工大学市政与环境工程系, 西安 710048
- 张涛
- 西北大学化学与材料科学学院/合成与天然功能分子化学教育部重点实验室, 西安 710069
- 陈经涛
- 陕西教育学院化学系, 西安 710061
- 摘要：为了明确影响Cu2+/吡啶/H2O2对模拟染料(DR4BE)废水脱色的主要因素,采用动力学分析、正交和Box-Behnken实验设计研究了不同溶液pH、Cu2+、吡啶、H2O2浓度及Cu2+、吡啶和H2O2组合对初始脱色速率常数和最终脱色率的影响.同时,采用自由基抑制、H2O2催化分解实验探索了Cu2+/吡啶/H2O2对染料的脱色机理.结果发现,Cu2+/吡啶/H2O2能有效使DR4BE快速脱色,脱色效率远高于Cu2+/H2O2;pH是影响初始脱色速率最重要的因素,吡啶、Cu2+及pH是影响最终脱色率最重要的因素;溶液pH在7.0左右时有利于该脱色过程的快速进行.Cu2+与吡啶的交互作用相对较强,吡啶、Cu2+与H2O2的交互作用相对较弱.羟基自由基氧化是Cu2+/吡啶/H2O2对染料DR4BE初始快速脱色的主要机理.研究结果还表明,Cu2+/吡啶/H2O2体系可用于中性条件下染料废水的快速脱色处理.
- Abstract：The decolorization of simulated wastewater containing the dye direct red 4BE(R4BE) by Cu (Ⅱ) /pyridine/H2O2 was studied.The solution pH,concentration of Cu (Ⅱ),pyridine and H2O2 and the effect of their combination on the decolorization process was studied by kinetic analysis, orthogonal and Box-Behnken methods.Experiments on hydroxyl radical inhibition and catalyzed H2O2 decomposition were conducted to investigate the decolorization mechanism of the dye,and the results indicate that the Cu (Ⅱ) /pyridine/H2O2 system can decolorize DR4BEat a much higher efficiency than the Cu (Ⅱ) /H2O2 system.The pHis the most important factor affecting the initial rate of decolorization,while the pyridine,copper and hydrogen peroxide concentrations are important factors that influence the final decolorization efficiency.Aneutral pHis favorable for decolorization of DR4BEby Cu (Ⅱ) /pyridine/H2O2. Moreover,copper and pyridine showed a significant interactive effect,while Cu (Ⅱ) /H2O2 and pyridine/H2O2 showed slight interaction effects.Hydroxyl radical oxidation is the main mechanism in Cu (Ⅱ) /pyridine/H2O2 decolorization of dye DR4BE.This study further hints that the Cu (Ⅱ) /pyridine/H2O2 process provides an alternative method for rapid decolorization of dye wastewater under near-neutral conditions.
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