Photo-assisted peroxymonosulfate activation via 2D/2D heterostructure of Ti3C2/g-C3N4 for degradation of diclofenac. (November 2020)

• Record Type: Journal Article
• Authors: He, Jie; Yang, Jingling; Jiang, Fengxing; Liu, Peng; Zhu, Mingshan
• Is Part Of: Chemosphere. Volume 258(2020)
• Publication Date: 2020-11
• Subjects: Broad pH range -- Peroxymonosulfate -- g-C3N4 -- Ti3C2 -- Diclofenac degradation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127339
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this paper, a two dimensional/two dimensional (2D/2D) heterostructure of Ti3 C2 /g-C3 N4 (T/CN) was constructed and used to activate peroxymonosulfate (PMS) for the degradation of diclofenac (DCF) in water in the presence of light illumination. Compared with single photocatalytic process by T/CN (0.040/min) and with pure g-C3 N4 nanosheets in PMS system (0.071/min), 5.0 and 3.0 times enhanced activities were achieved in the T/CN-PMS system at optimum Ti3 C2 (1.0 wt%) loading under light illumination (0.21/min). Moreover, the decomposing processes of DCF in T/CN-PMS system were applicable in a wide initial pH range (3∼14), therefore, overcoming the limitation of pH dependence in traditional PMS system. Based on the synergistic effect of photocatalysis and PMS oxidation processes, the 1 O2 was generated as primary reactive species for the removal of DCF in T/CN-PMS system. The DCF degradation mechanism was further proposed through the results of liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) calculations. Graphical abstract: Image 1 Highlights: 2D/2D heterostructure of Ti3 C2 /g-C3 N4 was used to activate peroxymonosulfate (PMS). The performance of PMS activation to remove diclofenac is improved by light assisted. The degradation of DCF by Ti3 C2 /g-C3 N4 activated PMS over a broad pH range (pH = 3∼14).