Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (1): 79-84.doi: 10.1007/s40242-018-8213-z

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Effective Removal of Tetracycline by Using Biochar Supported Fe3O4 as a UV-Fenton Catalyst

YU Xiaodan1,2, LIN Xinchen3, LI Weiguang4, FENG Wei2,3   

  1. 1. School of Environment, Harbin Institute of Technology, Harbin 150090, P. R. China;
    2. Key Labroratory of Songliao Aquatic Environnment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, P. R. China;
    3. Key Laboratory of Groundwater Resource and Environment, Ministry Education, College of Environment and Resources, Jilin University, Changchun 130021, P. R. China;
    4. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, P. R. China
  • Received:2018-06-26 Revised:2018-09-14 Online:2019-02-01 Published:2018-10-29
  • Contact: LI Weiguang, FENG Wei E-mail:hitliwg@126.com;weifeng@jlu.edu.cn

Abstract: Novel Fe3O4-decorate hierarchical porous carbon skeleton derived from maize straw (Fe3O4@MSC) was synthesized by a facile co-precipitation process and a calcination process, which was developed as a UV assisted heterogeneous Fenton-like catalyst. The as-synthesized catalysts were characterized via X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Brunauer-Emmet-Teller (BET) and vibrating sample magnetometer (VSM) at room temperature. The morphology and structure analysis revealed that the as-prepared Fe3O4@MSC retained the original pore morphology of the maize straw material. The non-uniform polyhedral Fe3O4 grew on the whole surface of the MSC, which reduced the aggragation of Fe3O4 and provided more active sites to strengthen the UV-assisted Fenton-like reaction. As a result, the tetracycline (TC) degradation efficiency after 40 min reaction and total organic carbon (TOC) removal efficiency after 2 h reaction of Fe3O4@MSC catalyzing UV-Fenton system reached 99.2% and 72.1%, respectively, which were more substantial than those of Fe3O4@MSC/H2O2 (31.5% and 2%), UV/H2O2 system (68% and 23.4%) and UV/Fe3O4/H2O2 (80% and 37.5%). The electron spin resonance (ESR) results showed that the ·OH played an important role in the catalytic reaction. A possible degradation pathway of TC was proposed on the basis of the identified intermediates. Overall, the UV assisted heterogeneous Fenton-like process in Fe3O4@MSC improved the cycle of Fe3+/Fe2+ and activated the interfacial catalytic site, which eventually realized the enhancement of degradation and mineralization to tetracycline.

Key words: Fe3O4, Carbon skeleton of maize straw, Heterogeneous Fenton-like catalyst, UV irradiation, Degradation of tetracycline