Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (7): 3572-3581.DOI: 10.16085/j.issn.1000-6613.2022-1700

• Industrial catalysis • Previous Articles     Next Articles

Properties and mechanism of eriochrome black T degradation by carbon nanotube-cobalt ferrite composites activated persulfate

GONG Pengcheng1,2(), YAN Qun1(), CHEN Jinfu1,2, WEN Junyu1,2, SU Xiaojie1,2   

  1. 1.School of Civil and Surveying &Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
    2.Research Center for Water Quality Security Technology at Ganjiang River Basin, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
  • Received:2022-09-13 Revised:2022-11-20 Online:2023-08-14 Published:2023-07-15
  • Contact: YAN Qun

铁酸钴复合碳纳米管活化过硫酸盐降解铬黑T的性能及机理

龚鹏程1,2(), 严群1(), 陈锦富1,2, 温俊宇1,2, 苏晓洁1,2   

  1. 1.江西理工大学土木与测绘工程学院,江西 赣州 341000
    2.江西理工大学赣江流域水质安全保障中心,江西 赣州 341000
  • 通讯作者: 严群
  • 作者简介:龚鹏程(1996—),男,硕士研究生,研究方向为水污染控制高级氧化技术。E-mail:1093173169@qq.com
  • 基金资助:
    “十二五”国家科技支撑计划(2012BAC11B07);江西省科技厅自然科学基金(20122BAB203027)

Abstract:

Cobalt ferrite and carbon nanotubes (CoFe2O4/CNT) composites with different mass ratios were prepared by hydrothermal method, and then used to activate persulfate (PMS) to degrade the azo dye eriochrome black T (EBT). Scanning electron microscope, X-ray diffractometer and X-ray photoelectron spectroscopy were used for sample characterization. The results showed that the introduction of CNT lessened the agglomeration of CoFe2O4, and accelerated the electron transfer process on the surface of CoFe2O4, and thus improved the catalytic activity. The CoFe2O4/CNT of mass ratio 4∶1 showed the highest catalytic activity, and the degradation process of EBT by CoFe2O4/CNT-4∶1+PMS was in accordance with the pseudo-first-order kinetics model, with the reaction rate constant 2.02 times higher than that of CoFe2O4+PMS system. Under the conditions of CoFe2O4/CNT-4∶1 dosage of 0.20g/L, PMS dosage of 0.20g/L, EBT concentration of 100mg/L, pH of 5.8 and the reaction temperature of 25℃, the degradation rate of EBT could reach 99.8% after 60min of reaction and could still reach 67.8% even when CoFe2O4/CNT-4∶1 had been reused for three times. Quenching experiments showed that there were four kinds of active substances in the reaction system, that is SO4-·, ·OH, O2-· and 1O2, among which 1O2 was the dominant one. Valence cycle of Fe2+/Fe3+ and Co2+/Co3+ and oxygen species change promoted the formation of active substances.

Key words: cobalt ferrite, carbon nanotubes, activation, catalyst support, degradation

摘要:

采用水热法制备了不同质量比铁酸钴/碳纳米管(CoFe2O4/CNT)复合材料,并将其用于活化过一硫酸盐(PMS)降解偶氮染料铬黑T(EBT)。使用扫描电镜、X射线衍射仪、X射线光电子能谱仪等方法进行了表征。结果表明,引入CNT改善了CoFe2O4团聚现象,同时CNT加速CoFe2O4表面电子转移过程进一步提高了CoFe2O4催化活性。质量比为4∶1的CoFe2O4/CNT表现出最高催化活性,CoFe2O4/CNT-4∶1+PMS降解EBT过程符合准一级动力学模型,其反应速率常数是CoFe2O4+PMS体系的2.02倍。单因素条件实验得出在CoFe2O4/CNT-4∶1投加量为0.20g/L、PMS投加量为0.20g/L、EBT质量浓度为100mg/L、pH为5.8、反应温度为25℃条件下,反应60min后EBT降解率可达到99.8%。CoFe2O4/CNT-4∶1循环使用三次后EBT降解率能达到67.8%。猝灭实验证明反应体系中存在着SO4-·、·OH、O2-·和1O2四种活性物质,其中1O2是主要活性物质。Fe2+/Fe3+、Co2+/Co3+价态循环和氧物种改变促进了活性物质生成。

关键词: 铁酸钴, 碳纳米管, 活化作用, 催化剂载体, 降解

CLC Number: 

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