单原子Co-C-N催化过一硫酸盐降解金橙Ⅱ  

Degradation of AO7 with peroxymonosulfate catalyzed by Co-C-N single atom

作　　者：徐劼 王柯晴 田丹 吴梅 李思佳 鲍秀敏 许晓毅 XU Jie;WANG Ke-qing;TIAN Dan;WU Mei;LI Si-jia;BAO Xiu-min;XU Xiao-yi(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215000,China;Sinosteel Tiancheng Environmental Protection Science&Technology Co.,Ltd,Wuhan 430080,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009 [2]中钢集团天澄环保科技股份有限公司,湖北武汉430080

出　　处：《中国环境科学》2021年第1期151-160,共10页China Environmental Science

基　　金：国家自然科学基金资助项目(51778391);水体污染控制与治理科技重大专项(2017ZX07201001)。

摘　　要：采用模板蚀刻法合成单原子Co-C-N催化剂并催化过一硫酸盐(PMS)降解偶氮染料金橙Ⅱ(AO7).考察了催化剂投加量、PMS浓度、pH值和染料废水中常见的Cl-对Co-C-N/PMS体系去除AO7的影响,探讨了体系的反应机理,分析了矿化能力和催化剂重复利用性能.结果表明,在Co-C-N/PMS体系中,反应随着催化剂投加量和PMS浓度的升高而加快,pH=3.0~9.0的范围内均能有效去除AO7.中性条件下,当Co-C-N投加量50mg/L、PMS浓度1.0mmol/L、AO7浓度0.05mmol/L时,AO7可在10min内被完全去除.非均相体系活化产生的SO4^·-是降解AO7的主要活性物种,基于C基诱导PMS产生的1O2也通过非自由基体系参与了降解反应,反应主要发生在催化剂表面.Co-C-N/PMS体系对AO7具有优良的去除能力和矿化效果.相较于单独Co-C-N吸附AO7过程,Co-C-N/PMS体系在提高反应速率的同时极大提升了催化剂的重复利用性能.Monoatomic Co-C-N catalyst was synthesized by a template etching method and then was used to activate peroxymonosulfate(PMS)for degradation of decolorize azo dye orange 7(AO7).The effects of catalyst dosage,PMS concentration,pH value of reaction medium and Cl-commonly exists in dye wastewater on the removal of AO7 in Co-C-N/PMS system were systematically evaluated.The reaction mechanism was inferred,the mineralization ability and the reuse of catalyst were investigated.Experimental results showed that Co-C-N can effectively activate PMS to degrade AO7,and the reaction rate for AO7 removal can be accelerated with an increase in Co-C-N dosage and PMS concentration.AO7 can be removed effectively in the range of pH=3.0 to 9.0.When the concentration of Co-C-N dosage、the PMS and AO7 concentration were 50mg/L、1.0mmol/L and 0.05mmol/L respectively,AO7 can be completely removed within 10min under a neutral condition.SO4^·- produced by PMS activation of heterogeneous system was the main active species for the degradation of AO7,and 1O2 produced by C-induced PMS was also involved in the degradation reaction through non-free radical system.The oxidation reaction mainly occurs on the surface of the catalyst.Co-C-N/PMS system has excellent removal ability and strong mineralization effect for AO7.Compared with the single Co-C-N adsorption process of AO7,Co-C-N/PMS system not only can increases the reaction rate,but also greatly improves the recyclability of the catalyst.

关 键 词：单原子 硫酸根自由基(SO4^·-) 氧化 单线态氧(1O2) 

分 类 号：X703[环境科学与工程—环境工程]