Tang Hanyu, Bian Zhaoyong, Zhang Lifei, Ma Bei, Wang Hui
College of Water Sciences, Beijing Normal University, Beijing 100875, PR China; State Environmental Protection Key Laboratory of Dioxin Pollution Control, National Research Center for Environmental Analysis and Measurement, Beijing 100029, PR China; Engineering Research Center of Groundwater Pollution Control and Remediation, Ministry of Education of China, Beijing Normal University, Beijing 100875, PR China.
College of Water Sciences, Beijing Normal University, Beijing 100875, PR China.
Sci Total Environ. 2024 Nov 20;952:175959. doi: 10.1016/j.scitotenv.2024.175959. Epub 2024 Aug 31.
In this study, electrochemical dechlorination and detoxification of a mixture of chlorinated ethylenes was investigated under various conditions using a double monoatomic synergistic metal catalytic cathode. Electrocatalytic degradation of mixed chlorinated with stepwise voltage and alternating current exhibited excellent dechlorination efficiency. The removal ratios of 1,2-dichloroethylene (1,2-DCE), trichloroethylene (TCE), and tetrachloroethylene (PCE) reached 78.79 %, 79.27 %, and 93.44 % in 10 min, and 98.14 %, 97.56 %, and 98.70 % in 30 min, respectively. The toxicity was evaluated using a quantitative structure-activity relationship model. The cumulative toxicity was reduced to 8.00 % of the initial cumulative toxicity in 30 min. An electrochemical dechlorination strategy for selective degradation and detoxification of mixtures of chlorinated pollutants is proposed. Controlled dechlorination and detoxification under low-voltage control avoided the accumulation of toxic intermediates. Cumulative toxicity was reduced by strategies of selective dechlorination, and segmented and alternating current decreased the energy consumption. The strategy provides a basis for alternating current electrocatalytic dechlorination associated with mixed chlorinated pollutants treatment.
在本研究中，使用双单原子协同金属催化阴极，在各种条件下研究了氯化乙烯混合物的电化学脱氯和解毒。采用逐步电压和交流电对混合氯化物进行电催化降解，表现出优异的脱氯效率。1,2 - 二氯乙烯（1,2 - DCE）、三氯乙烯（TCE）和四氯乙烯（PCE）在10分钟内的去除率分别达到78.79%、79.27%和93.44%，在30分钟内分别达到98.14%、97.56%和98.70%。使用定量构效关系模型评估毒性。30分钟内累积毒性降至初始累积毒性的8.00%。提出了一种用于选择性降解和解毒氯化污染物混合物的电化学脱氯策略。低压控制下的可控脱氯和解毒避免了有毒中间体的积累。通过选择性脱氯策略降低了累积毒性，分段和交流电降低了能耗。该策略为与混合氯化污染物处理相关的交流电电催化脱氯提供了依据。
