Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (2): 322-332.DOI: 10.1016/S1872-2067(19)63447-9

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Mechanistic studies on peroxymonosulfate activation by g-C3N4 under visible light for enhanced oxidation of light-inert dimethyl phthalate

Lijie Xua, Lanyue Qia, Yang Suna, Han Gongb, Yiliang Chena, Chun Peic, Lu Gand   

  1. a College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037, Jiangsu, China;
    b College of Marine Sciences, South China Agricultural University, Guangzhou 510642, Guangdong, China;
    c Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, School of Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China;
    d College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China
  • Received:2019-04-19 Revised:2019-07-05 Online:2020-02-18 Published:2019-11-04
  • Supported by:
    This work was supported by the Natural Science Foundation of Jiangsu Province (BK20160936, BK20160938), the National Natural Science Foundation of China (51708297), and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). The advanced analysis and testing center of Nanjing Forestry University is also acknowledged.

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Abstract: Excitation of metal-free graphitic carbon nitride (g-C3N4) under visible light can successfully achieve efficient activation of peroxymonosulfate (PMS). Synergistic effects and involved mechanism were systematically investigated using a light-inert endocrine disrupting compound, dimethyl phthalate (DMP), as the target pollutant. Under visible light irradiation, DMP could not be degraded by direct g-C3N4-mediated photocatalysis, while in the presence of PMS, the dominant radicals were converted from ·O2 to SO4·- and ·OH, resulting in effective DMP degradation and mineralization. Results showed that higher dosage of PMS or g-C3N4 could increase the activation amount of PMS and corresponding DMP degradation efficiency, but the latter approach was more productive in terms of making the most of PMS. High DMP concentration hindered effective contact between PMS and g-C3N4, but could provide efficient use of PMS. Higher DMP degradation efficiency was achieved at pH lower than the point of zero charge (5.4). Based on intermediates identification, the DMP degradation was found mainly through radical attack (·OH and SO4·-) of the benzene ring and oxidation of the aliphatic chains.

Key words: Graphitic carbon nitride, Visible light, Peroxymonosulfate, Dimethyl phthalate, Activation, Degradation