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| Enhanced removal of organics by permanganate preoxidation using tannic acid as a model compound – Role of in situ formed manganese dioxide | |
| 作者姓名： | ZHANG Lizhu MA Jun LI Xin WANG Shutao |
| 作者单位： | ZHANG Lizhu(School of Science, Harbin Institute of Technology, Harbin 150090, China;School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China);MA Jun,WANG Shutao(School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China);LI Xin(School of Science, Harbin Institute of Technology, Harbin 150090, China) |
| 基金项目： | the National Natural Science Foundation of China under the scheme of Inno-vation Team Fund，黑龙江省自然科学基金，the State Key Laboratory of Urban Water Resource and Environment under the scheme of Environmental Function Materials and Application |
| 摘 要： | |
| 关 键 词： | 模型化合物 有机物去除 二氧化锰 原位形成 单宁酸 高锰酸钾 预氧化 三氯化铝 |
| 收稿时间： | 29 August 2008 |
| 修稿时间： | 27 November 2008 |
Enhanced removal of organics by permanganate preoxidation using tannic acid as a model compound - Role of in situ formed manganese dioxide |
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| ZHANG Lizhu,MA Jun,LI Xin,WANG Shutao.Enhanced removal of organics by permanganate preoxidation using tannic acid as a model compound - Role of in situ formed manganese dioxide[J].Journal of Environmental Sciences,2009,21(7):872-876. | |
| Authors: | ZHANG Lizhu MA Jun LI Xin and WANG Shutao |
| Institution: | 1. School of Science, Harbin Institute of Technology, Harbin 150090, China;School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China 3. School of Science, Harbin Institute of Technology, Harbin 150090, China |
| Abstract: | The effect of permanganate preoxidation on organic matter removal during the coagulation with aluminum chloride was investigated using tannic acid as a model compound. Results showed that a small amount of KMnO4 (0.75 mg/L) increased the removal efficiency of tannic acid up to 20%, as compared to the process of coagulation by aluminum chloride alone. The key factor enhancing the removal efficiency of tannic acid in preoxidation process was the in situ formation of a reductant manganese dioxide. The complexation model was used to describe the reaction between MnO2 and tannic acid. Under weak pH condition, tannic acid was difficult to be adsorbed by MnO2 due to the static electrical repulsive forces. The presence of Ca2+ served as a bridge to hold the negative charged MnO2 and tannic acid together, which could be a crucial factor influencing tannic acid adsorption by in-situ manganese dioxide. |
| Keywords: | KMnO4 MnO2 adsorption coagulation oxidation tannic acid |
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