生物炭/过一硫酸盐体系同时去除Cu^2+和对硝基苯胺  

Simultaneous removal of Cu^2+and p-nitroaniline from aqueous solution by biochar/peroxymonosulfate system

作　　者：孙鹏[1,2] 张凯凯 张玉 张延荣[1] SUN Peng;ZHANG Kaikai;ZHANG Yu;ZHANG Yanrong(Environmental Science Research Institute,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;Institute of Energy and Environment,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]华中科技大学环境科学与工程学院,湖北武汉430074 [2]内蒙古科技大学能源与环境学院,内蒙古包头014010

出　　处：《化工进展》2020年第10期4268-4274,共7页Chemical Industry and Engineering Progress

基　　金：中国国际科技合作项目(2016YFE0126300)。

摘　　要：目前,重金属离子和有机污染物共存的废水处理是一个世界性的重大问题,对环境保护具有重要的意义。本研究以农业废弃物向日葵秸秆为原料,制备了一种生物炭(BC),用以活化过一硫酸盐(PMS)。BC/PMS体系实现了对水中重金属Cu^2+和有机污染物对硝基苯胺(PNA)的同时去除。探究了pH、BC投加量和PMS浓度等反应条件对同时去除Cu^2+和PNA的影响。研究表明,在BC=2.0g/L、PMS=1.0mmol/L、PNA=20.0mg/L、Cu^2+=2.0mg/L和pH=3.0条件下,60min时Cu^2+和PNA同时去除效率分别为90.00%和100.00%;Cu^2+被BC/PMS体系吸附去除的同时也显著地促进了PNA的降解去除。自由基猝灭实验和电子顺磁共振光谱(EPR)实验表明,BC/PMS/Cu^2+/PNA体系降解PNA为自由基反应和非自由基反应共存过程,且以非自由基反应为主导;自由基反应是基于Cu^2+活化PMS产生SO4^·-和•OH,非自由基反应可归因于BC活化PMS产生活性物种1O2。Nowadays,clean-up of wastewaters with the coexistence of heavy metal ions and organic pollutants is a huge issue worldwide.A sunflower straw-based biochar(BC)was prepared and the simultaneous removal of Cu2+and p-nitroaniline(PNA)in aqueous solutions by BC/peroxymonosulfate(PMS)system was achieved.The effects of reaction conditions such as pH,BC dosage and PMS concentration on simultaneous removal of Cu^2+and PNA were investigated.The results demonstrated that the simultaneous removal efficiency of Cu^2+and PNA reached 90.00%and 100.00%,respectively,with BC of 2.0g/L,PMS of 1.0 mmol/L,PNA of 20.0mg/L,Cu^2+of 2.0mg/L,initial pH of 3.0 and reaction time of 60min.Cu2+was adsorbed and removed by BC/PMS system,which also promoted the degradation efficiency of PNA.Free radical quenching experiments and EPR studies indicated that free radical reaction and non-radical reaction were involved in the BC/PMS/Cu^2+/PNA system,and the non-radical reaction were the main process for the PNA degradation.The free radical reaction was based on the activation of PMS by Cu^2+to produce SO4^·- and•OH.The non-free radical reaction was due to the activation of PMS by BC to generate 1O2.

关 键 词：生物炭 过一硫酸盐 同时去除 铜离子 对硝基苯胺 

分 类 号：X703.1[环境科学与工程—环境工程]