炭基-Co3O4复合材料活化过一硫酸盐降解阿特拉津

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.

Biochar-Co3O4 composite activates peroxymonosulfate to degrade atrazine

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.