Wan Jinzhong, Guo Yang, Zhang Zehang, Deng Rufeng, Wang Xiang, Cao Shaohua, Zhang Xiaodong, Miao Yifei, Jiang Jinlin, Song Zhen, Long Tao, Sun Cheng, Zhu Xin
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
State Environmental Protection Key Laboratory of Soil Environmental Management and Pollution Control, Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China.
Sci Total Environ. 2024 Jul 10;933:173053. doi: 10.1016/j.scitotenv.2024.173053. Epub 2024 May 8.
Nitrochlorobenzene (NCB) is very common in pesticide and chemical industries, which has become a major problem in soil environment. However, the remediation of NCB contaminated soil is received finite concern. Using biochar as a substrate for nanoscale-zero valent iron (nZVI/p-BC) to activate peroxodisulfate (PDS), a novel heterogeneous oxidative system had been applied in the current study to remediate NCB contaminants in soil. The degradation efficiencies and kinetics of m-NCB, p-NCB, and o-NCB by various systems were contrasted in soil slurry. Key factors including the dosage of nZVI/p-BC, the molar ratio of nZVI/PDS, initial pH and temperature on degradation of NCB were further examined. The results confirmed that the nZVI/p-BC/PDS displayed the remarkable performance for removing NCB compared with other systems. Higher temperature with nZVI/PDS molar ratio of 2:1 under the acidic condition favored the reduction of NCB. The treatment for NCB with optimal conditions were evaluated for the engineering application. The mechanism of nZVI/p-BC/PDS indicated that electron transfer between p-BC and nZVI was responsible for activation of PDS, generating active species (SO•, •OH and O) via both the free and non-free radical pathways. Experimental results revealed prominent availability of nZVI/p-BC/PDS system in remediation of actual contaminated field by NCB.
硝基氯苯（NCB）在农药和化工行业中非常常见，已成为土壤环境中的一个主要问题。然而，NCB污染土壤的修复受到的关注有限。本研究采用生物炭作为纳米零价铁（nZVI/p-BC）的载体来活化过二硫酸盐（PDS），应用了一种新型的非均相氧化体系来修复土壤中的NCB污染物。在土壤浆液中对比了不同体系对间硝基氯苯（m-NCB）、对硝基氯苯（p-NCB）和邻硝基氯苯（o-NCB）的降解效率和动力学。进一步考察了nZVI/p-BC用量、nZVI/PDS摩尔比、初始pH值和温度等关键因素对NCB降解的影响。结果证实，与其他体系相比，nZVI/p-BC/PDS在去除NCB方面表现出显著性能。在酸性条件下，较高温度和nZVI/PDS摩尔比为2:1有利于NCB的还原。对最佳条件下NCB的处理进行了工程应用评估。nZVI/p-BC/PDS的作用机制表明，p-BC与nZVI之间的电子转移负责PDS的活化，通过自由基和非自由基途径产生活性物种（SO•、•OH和O）。实验结果表明，nZVI/p-BC/PDS体系在修复实际NCB污染场地方面具有显著的可行性。
