摘要
文章通过共沉淀法合成了纳米磁铁矿,并利用XRD、TEM、VSM以及XAS对其形貌结构及磁性能进行表征,考察其在有氧条件下对邻苯二甲酸二丁酯(DBP)的催化活性。结果显示,向pH值为6.5的废水中加入过量磁性纳米材料,第1天在无氧条件下放置,第2天分2次共曝气30 min后,DBP的去除率达到64%,在反应期间磁铁矿被部分氧化成磁赤铁矿。通过液相色谱-质谱联用仪(UHPLC-MS/MS)鉴定了DBP的降解产物,推测了DBP可能的降解途径。同时,文章解释了该反应的反应机理,利用乙醇猝灭实验,提供了羟基自由基(HO·)参与了DBP的氧化降解反应的证据。该研究说明纳米磁铁矿是一种具有潜在优势的催化剂,能用于催化降解土壤和废水中的难降解有机污染物。
Nano-magnetite was synthesized through coprecipitation method,and the material was characterized by XRD, TEM,VSM and XAS.The oxidative capacity of nano-magnetite (Fe3O4)was investigated,and the composite was used as the heterogeneous Fenton-like catalyst for the removal of dibutyl phthalate (DBP).Results show that nearly 64% of DBP was eliminated after 30 min (two times)exposure to air bubbling in solution with pH value 6.5 in the presence of an excess of nano-magnetite.A partial oxidation of magnetite was also found to maghemite during the reaction.The intermediate products of DBP were identified by liquid chromatography-mass spectroscopy (UHPLC-MS/MS).At the same time,the mechanism of the reaction was explained.The evidence was provided that hydroxyl radicals (HO-)were involved in the oxidative degradation of DBP,as indicated by the quenching of the degradation reaction in the presence of ethanol.This study points out the promising potentialities of nano-magnetite for the treatment of soils and wastewater contaminated by organic pollutants.
作者
陆仁强
LU Renqiang(School of Civil and Environmental Engineering,Hunan University of Science and Engineering,Yongzhou 425199,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第12期49-55,61,共8页
Environmental Science & Technology
