摘要
为探究球磨钒钛磁铁矿尾矿(B-VTMT)活化过硫酸盐(PS)去除地下水中有机污染物2,4-二氯苯酚(2,4-DCP)可行性,采用扫描电子显微镜、X射线衍射仪、X射线光电子能谱等表征手段对B-VTMT的形貌和组成进行测试分析,探讨B-VTMT投加量、PS初始浓度、初始pH、2,4-DCP初始浓度及地下水常见阴离子(Cl^(-)、NO_(3)^(-)、SO_(4)^(2-))对2,4-DCP去除率的影响。结果表明:在B-VTMT投加量为0.5 g/L,PS浓度为5 mmol/L,2,4-DCP初始浓度为20 mg/L,初始pH为7.1,室温条件下39 h内2,4-DCP的去除率为45.4%。自由基淬灭和捕获试验证实,硫酸根自由基(SO_(4)^(-)·)和羟基自由基(·OH)是体系去除2,4-DCP的主要活性自由基,通过高效液相色谱-质谱仪(HPLC-MS)识别了8种中间产物,推测了2,4-DCP可能的降解路径。地下水中Cl-提高了2,4-DCP的去除率,而NO_(3)^(-)和SO_(4)^(2-)降低了2,4-DCP的去除率。研究显示,B-VTMT作为PS的活化剂是一种很有前景的尾矿资源化利用方式。
The removal feasibility of 2,4-dichlorophenol(2,4-DCP)in groundwater by persulfate(PS)activated with ball^(-)milling vanadium-titanium magnetite tailings(B-VTMT)was investigated.The morphology and composition of B-VTMT were analyzed by scanning electron microscope,X-ray diffraction,and X-ray photoelectron spectroscopy.The effects of B-VTMT dosages,initial PS concentrations,initial pH,initial 2,4-DCP concentrations,and common anions in groundwater(Cl^(-),NO_(3)^(-),and SO_(4)^(2-))on 2,4-DCP removal efficiency were explored.The experiment results indicated that:The removal efficiency of 2,4-DCP was 45.4%within 39 h at room temperature under the conditions of B-VTMT dosage of 0.5 g/L,initial PS concentration of 5 mmol/L,initial 2,4-DCP concentration of 20 mg/L and initial pH 7.1.Radical quenching experiments and electron spin-resonance(ESR)spectroscopy confirmed that sulfate radical(SO_(4)^(-)·)and hydroxyl radical(·OH)were the main free radicals of 2,4-DCP removal.Eight intermediates were identified by high performance liquid chromatography-mass spectrometry(HPLC-MS).The possible degradation pathways of 2,4-DCP were speculated.The presence of chloride ions promoted the 2,4-DCP removal efficiency,while nitrate ions and sulfate ions inhibited the 2,4-DCP removal efficiency.It was concluded that B-VTMT could effectively activate PS to remove 2,4-DCP in groundwater,which was a promising way of tailings resource utilization.
作者
夏甫
徐祥健
路红丽
郜普闯
韩旭
肖瀚
王新港
杨昱
姜永海
XIA Fu;XU Xiangjian;LU Hongli;GAO Puchuang;HAN Xu;XIAO Han;WANG Xingang;YANG Yu;JIANG Yonghai(National Engineering Laboratory for Site Remediation Technologies,Beijing Construction Engineering Group Environmental Remediation Co.,Ltd.;State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Chinese Research Academy of Environmental Sciences)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2023年第3期1139-1149,共11页
Journal of Environmental Engineering Technology
基金
污染场地安全修复技术国家工程实验室开放基金(NEL-SRT201704)
国家重点研发计划项目(2019YFC1806200)。
关键词
钒钛磁铁矿尾矿
过硫酸盐
活化机制
影响因素
vanadium-titanium magnetite tailings
persulfate
activation mechanism
influencing factors
