文献类型：期刊文献

英文题名：Natural manganese sand activates sodium hypochlorite to enhance ionic organic contaminants removal: Optimization, modeling, and mechanism

作者：Huang, Qian[1];Meng, Guangyuan[1];Zhang, Xinwan[1];Fang, Zhengnan[1];Yan, Ying[1,2];Liao, Benren[3,4];Zhang, Lehua[1,2,5];Chen, Peng[1,6]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Natl Engn Lab Ind Wastewater Treatment, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[3]Shanghai 4 Reagent & HV Chem Co Ltd, Shanghai 200940, Peoples R China;[4]Shanghai 4 Reagent Chem Co Ltd, Shanghai 201512, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[6]130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2023

卷号：866

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20230213361712);WOS:【SCI-EXPANDED(收录号:WOS:000921469100001)】；

基金：This work was supported by the National Key Research and Development Program of China (Developing Highly Efficient Means of Water Utilization, 2019YFC0408202) and the National Natural Science Foundation of China (NSFC) (21876050) .

语种：英文

外文关键词：Natural manganese sand; Sodium hypochlorite; Kinetic study; Electron transfer

摘要：Although sodium hypochlorite acting as an oxidant has been investigated for the role it plays in the degradation of organic contaminants, little attention has been paid to its activation and efficient utilization. In this study, natural manganese sand (NMS) was verified to be effective for activation of sodium hypochlorite (NaClO). Due to the generation of O-2(center dot-), the removal efficiency of ionic organic contaminants in NMS/NaClO system was 1.9-4.1 times higher than that in NMS or NaClO alone. Hence, NMS activated NaClO system performed similar to 96.6% contaminants removal efficiency at a wide pH range (pH 5-9). Kinetic modeling yielded that the NMS dosage was more important than NaClO dosage. Long-termstability was observed in the presence of various salts (bicarbonate, sulfate, phosphate, and chloride). Characterization results revealed that electron transfer among NMS, NaClO, and organic contaminants was responsible for NaClO activation. Then NaClO-based Fenton-like process was proposed by tracing the degradation intermediates of methyl orange (MO) and generations of reactive oxygen species in the MO/NMS/NaClO system. This study presents the potential of NMS to activate NaClO and enhance ionic organic contaminants removal from aquatic environments.