摘要
【目的】工业快速发展导致水体中氯酚类污染物含量上升,对生态系统和人类生存发展造成影响,高效降解工业废水中难降解污染物2,4-二氯酚(2,4-DCP)成为。【方法】通过一步浸渍法制备了具有贫/富电子活性中心的Co_(3)O_(4)包覆碳纤维催化剂(Co_(3)O_(4)@CF),并应用于活化过硫酸盐降解2,4-DCP研究中。【结果】研究结果表明,Co_(3)O_(4)被均匀的涂覆在具有规则骨架结构的碳纤维表面,在Co(Ⅱ)-π的相互作用下形成了富电子钴中心和贫电子碳中心。在pH值为3.0~7.8,2,4-DCP的质量浓度为50mg/L,Co_(3)O_(4)@CF质量浓度为0.1g/L,PMS浓度为10mmol/L的初始条件下,Co_(3)O_(4)@CF在20min内可实现2,4-DCP的完全降解。在此过程中,Co_(3)O_(4)@CF可诱导反应体系中电子从贫电子中心向富电子中心转移,实现Co_(3+)的快速还原和PMS的快速活化。表征结果也进一步证明,碳纤维不仅可以作为载体,还可以通过其结构缺陷参与过硫酸盐活化的链式自由基反应,从而促进SO_(4)^(-)·转换为1O_(2)和O_(2)^(-)·,达到高效降解2,4-DCP的目的。
【Purposes】Rapid industrial development has led to increased levels of chlorophenolic pollutants in water bodies,which poses threats to ecosystems and human survival.【Methods】In order to efficiently degrade the refractory contaminant 2,4-dichlorophenol(2,4-DCP)in industrial wastewater,a Co_(3)O_(4)-coated carbon fiber catalyst(Co_(3)O_(4)@CF)with poor/rich electron-active centers was prepared by one-step impregnation method,and applied to the study of activated persulfate degradation of 2,4-DCP.【Findings】The results show that Co_(3)O_(4) is uniformly coated on the surface of carbon fibers with regular skeleton structure,and electron-rich cobalt centers and electron-poor carbon centers are formed under the Co(Ⅱ)-πinteractions.Under the initial conditions of pH 3.0~7.8,2,4-DCP mass concentration of 50 mg/L,Co_(3)O_(4)@CF mass concentration of 0.1 g/L,and PMS concentration of 10 mmol/L,the complete degradation of 2,4-DCP is achieved by Co_(3)O_(4)@CF within 20 min.During the process,Co_(3)O_(4)@CF can induce the transfer of electrons from electron-poor to electron-rich centers in the reaction system to achieve rapid reduction of Co_(3+)and rapid activation of PMS.The characterization results further demonstrate that carbon fibers can not only at as carriers,but also participate in the PMS activated chain radical reaction through their structural defects,thus promoting the conversion of SO_(4)^(-)·to 1O_(2) and O_(2)^(-)·for the efficient degradation of 2,4-DCP.
作者
张禹洵
卫月星
焦路畅
秦育红
申浩楠
贺冲
崔丽萍
ZHANG Yuxun;WEI Yuexing;JIAO Luchang;QIN Yuhong;SHEN Haonan;HE Chong;CUI Liping(College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China)
出处
《太原理工大学学报》
CAS
北大核心
2024年第3期538-549,共12页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(22206149,21975172)
山西省自然科学青年基金项目(20210302124220)。
