研究报告

  • 张博,黎素,张扬,肖纯.富氧空位MoO2强化Fe2+/过一硫酸盐体系降解四环素[J].环境科学学报,2022,42(11):66-76

  • 富氧空位MoO2强化Fe2+/过一硫酸盐体系降解四环素
  • Oxygen vacancy-rich MoO2 strengthening the Fe2+/PMS system for the degradation of Tetracycline
  • 基金项目:肇庆市科技创新指导类项目(No. 2021040302003,201904030201); 肇庆学院校级科研基金项目(No. 201902,202012,202021,202022)
  • 作者
  • 单位
  • 张博
  • 肇庆学院环境与化学工程学院,肇庆 526061;广东省环境健康与资源利用重点实验室,肇庆 526061
  • 黎素
  • 肇庆学院环境与化学工程学院,肇庆 526061;广东省环境健康与资源利用重点实验室,肇庆 526061
  • 张扬
  • 肇庆学院环境与化学工程学院,肇庆 526061;广东省环境健康与资源利用重点实验室,肇庆 526061
  • 肖纯
  • 肇庆学院环境与化学工程学院,肇庆 526061
  • 摘要:采用NaBH4超声还原法合成了富含氧空位的MoO2,并通过多种表征方法证明了氧空位的存在.10-MoO2作为助催化剂显著增强了Fe2+/过一硫酸盐体系催化性能,构建的10-MoO2/Fe2+/PMS体系可快速降解四环素(TC),10 min内对TC的降解率接近100%.系统研究了各种影响因素对TC降解效果的影响,探讨了助催化剂的稳定性及该体系的实用性.电化学、铁离子循环及自由基捕获实验的结果表明,由于氧空位(Ovacancy)的存在,降低了MoO2的电阻,增强了电子转移能力,加速了Fe3+/Fe2+循环,提高了活性氧物种的产率,从而增强了Fe2+/PMS类芬顿体系的催化活性.本研究为类芬顿法处理抗生素废水提供了一种新的视角.
  • Abstract:Oxygen-vacancy-rich MoO2 was synthesized by ultrasonic reduction method with NaBH4, and the existence of oxygen vacancies was demonstrated by various characterization methods. By employing 10-MoO2 as a cocatalyst, the catalytic effect of the Fe+/peroxymonosulfate system promoted significantly, and the tetracycline (TC) could be degraded rapidly by the 10-MoO2/Fe2+/PMS system, close to 100% within 10 min. The effects of various factors on the degradation of TC were systematically studied. The stability of the cocatalyst and the practical feasibility of the system were discussed. The results of electrochemical, iron ions cycle and radical trapping experiments showed that due to the existence of oxygen vacancies (Ovacancy), the resistance of MoO2 was reduced and the electron transfer ability was improved, which acceleratinges the cyclic transformation cycle of Fe3+/Fe2+, so as to promote the generatingon of reactive oxygen species, and thereby enhance the catalytic activity of Fe2+/PMS Fenton-like system was enhanced. This study provides a new perspective for the treatment of antibiotic wastewater by Fenton-like method.

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