摘要
利用水热浸渍法制备了生物炭基-Co3O4复合材料(Co-OB),采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶变换衰减全反射红外光谱仪(ATR-IR)等手段对Co-OB进行表征,并研究了其活化过一硫酸盐(PMS)降解阿特拉津(ATZ)的性能,探究了PMS投加量、腐殖酸(HA)和Cl-对ATZ降解的影响.结果表明,在Co-OB活化投加量0.025g/L,PMS浓度200μmol/L,ATZ浓度20μmol/L,室温条件下10min内ATZ的去除率为86.3%,与生物炭(OB)和Co3O4相比,其去除率为后两者之和的2.2倍.随着PMS浓度增加,ATZ去除率显著提高.Cl-、HA的存在抑制了ATZ的降解,且随Cl-、HA浓度增加,抑制程度增大.自由基猝灭实验表明⋅OH和SO4⋅-是ATZ降解的主要活性物种.通过液相色谱-质谱联用仪(LC-MS)分析出6种中间产物,并推测出ATZ的降解途径.稳定性实验表明Co-OB具有重复使用性及低Co2+溶出.
Co3O4-biochar composite(Co-OB)was prepared by hydrothermal impregnation,and characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD)and attenuated total reflection-infrared spectroscopy(ATR-IR).Degradation efficiency of atrazine(ATZ)was evaluated by Co-OB activated peroxymonosulfate(PMS).The effects of PMS concentration,humic acid(HA)and Cl-on ATZ degradation were investigated.When 20μmol/L ATZ was treated by 0.025g/L Co-OB and 200μmol/L PMS in room temperature,a removal rate of ATZ at 86.3%was achieved within 10min.The efficiency of Co-OB/PMS oxidation of ATZ was 2.2times higher than the sum of that in biochar(OB)and Co3O4 activation.The ATZ removal rate was significantly increased with increasing PMS concentration.Presence of Cl-and HA played negative effects on the degradation of ATZ,and the inhibitory effect was more obvious as the concentration of Cl-and HA increased.The radical scavenging experiments showed that⋅OH and SO4⋅-played a dominant role in ATZ degradation.Six transformation intermediates were documented by liquid chromatography-mass spectrometry(LC-MS),and a degradation pathway of ATZ during Co-OB/PMS oxidation was presumed.The stability experiments showed that Co-OB was reusable corresponding with low Co2+dissolution.
作者
陈天民
陈颢明
马红玉
唐可欣
赵言文
CHEN Tian-ming;CHEN Hao-ming;MA Hong-yu;TANG Ke-xin;ZHAO Yan-wen(College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China;School of Environmental and Biological Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第11期4786-4794,共9页
China Environmental Science
基金
南京理工大学科研启动经费(AZ89991/197)。
