Dechlorination and detoxication of pesticides and chlorine salt enrichment using molten NaOH-KOH
ZHAO You-cai1,2, DAI Shi-jin1, ZHENG Yi-lin1, LI Qiang3, WANG Yun-xue4, YAN Zhen-hui5, WU Qi-fang6, YANG Ying-sheng6, LING Jin-ming7, WANG Yan-ming8, NIU Dong-jie1,2
1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China;
3. China Everbright Greentech Management Limited, Shenzhen 518040, China;
4. Rizhao Zili Environmental Protection Technology Co., LTD, Rizhao 276800, China;
5. Shanghai Solid Waste Disposal Center, Shanghai 201815, China;
6. Shanghai Tianhan Environmental Resources Co., LTD, Shanghai 201112, China;
7. Beijing GeoEnviron Engineering & Technology, Inc, Beijing 100095, China;
8. Shanghai Municipal Engineering Design & Research Institute Co., Ltd, Shanghai 200092, China
In this paper, molten NaOH-KOH mixture was selected as the medium for the destruction of pesticides, with the 2,4-dichlorophenol as an example. The effect of temperature, hydroxide amount and reaction time were investigated. The equal molal weight showed a best dechlorination rate and the increased temperature as well as hydroxide amount can promoted the dechlorination reaction. When the temperature of 200℃, reaction time of 180min and hydroxide amount of 20g, the dechlorination efficiency acquired 80.1%. The FTIR spectra demonstrated the cleavage of benzene ring and C-Cl bond, leading to the generation of intermediate products. Gases like HCl was restrained by the molten salt medium to form chlorine salt, according to the XRD patterns.
赵由才, 戴世金, 郑怡琳, 李强, 王云学, 晏振辉, 吴奇方, 杨颖胜, 凌锦明, 王艳明, 牛冬杰. 低温碱性熔体脱氯解毒农药废物及氯盐的富集[J]. 中国环境科学, 2018, 38(10): 3775-3780.
ZHAO You-cai, DAI Shi-jin, ZHENG Yi-lin, LI Qiang, WANG Yun-xue, YAN Zhen-hui, WU Qi-fang, YANG Ying-sheng, LING Jin-ming, WANG Yan-ming, NIU Dong-jie. Dechlorination and detoxication of pesticides and chlorine salt enrichment using molten NaOH-KOH. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(10): 3775-3780.
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