摘要
通过考察NaClO添加量、n(Fe^(2+))∶n(NaClO)、反应时间、土壤p H、腐植酸与无机阴离子对阿特拉津降解效率的影响,对比Fe^(2+)/NaClO氧化处理后土壤微生物群落的变化情况,探究了Fe SO4活化NaClO对土壤中阿特拉津的降解性能。结果表明:当NaClO添加量为10 mmol,n(Fe^(2+))∶n(NaClO)为1∶1时,阿特拉津降解效率最佳,为82%;其降解符合一级反应动力学模型;Fe^(2+)/NaClO体系比单独的NaClO可产生更多的·OH参与阿特拉津降解;降解过程受土壤p H(3~9)影响较小;腐植酸和无机阴离子(Cl-、HCO_(3)^(-))对阿特拉津降解有消极影响。经过Fe^(2+)/NaClO处理后土壤微生物门类丰度发生明显变化,如Proteobacteria门丰度由25.46%变化为72.73%。
This study investigated the feasibility of atrazine degradation in soil by using Fe^(2+)-activated hypochlorite(NaClO).The effect of main factors such as oxidant dosage,the Fe^(2+)to NaClO molar ratio,initial soil p H,etc.on the degradation of atrazine was considered.The results showed that after 8 h reaction,82%of atrazine could be degraded when NaClO dosage was 10 mmol at Fe^(2+)/NaClO molar ratio of 1∶1.The degradation of atrazine followed the pseudo-first-order model.ESR result confirmed that the Fe^(2+)/NaClO system yielded more HO·than that of Na OCl alone to participate in atrazine degradation.The Fe^(2+)/NaClO process could operate over a wide p H range(3~9),while humic acid and inorganic anions(Cl-,HCO_(3)^(-))in the soil matrix had a negative effect on atrazine degradation.After the Fe^(2+)/NaClO treatment,the soil microbial community was obviously affected,and the relative abundance of Proteobacteria rose from 25.46%to 72.73%.
作者
黄凤莲
邹璇
陈灿
钟振宇
李小明
万勇
刘婉蓉
HUANG Feng-lian;ZOU Xuan;CHEN Can;ZHONG Zhen-yu;LI Xiao-ming;WAN Yong;LIU Wan-rong(Hunan Research Academy of Environmental Sciences,Changsha 410004,China;College of Environmental Science and Engineering,Hunan University,Changsha 410082,China;Solid Waste and Chemicals Management Center,Ministry of Environmental Protection,Beijing 100029,China)
出处
《环境工程》
CAS
CSCD
北大核心
2021年第2期160-165,172,共7页
Environmental Engineering
基金
国家重点研发计划(2018YFC1800400)。
关键词
亚铁活化
次氯酸钠
阿特拉津
土壤修复
微生物群落
ferrous activation
sodium hypochlorite
atrazine
soil remediation
microbial community
