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Based on the strong capability of transition metal ions for peroxymonosulfate (PMS) activation and highly affinity of MoS2 towards PMS, thus decorating MoS2 with transition metal ions would efficiently activate PMS for degradation of organic pollutants. In this work, Co/Fe co-doped MoS2 catalyst were synthesized by simple chemical method. The prepared Co/Fe co-doped MoS2 catalyst displayed excellent catalytic activity for organic pollutant degradation. The removal efficiency of RhB and MB is 99% in 6 min and 98% in 15 min under PMS system, respectively. Both the capture experiment and EPR results verified that 1O2 played an important role in the organic pollutant degradation process in PMS system. The catalytic mechanism revealed that the synergistic effect between Mo ion and Co/Fe ions is beneficial for boosting the catalytic properties of Co/Fe co-doped MoS2 catalyst. The cycle experiments confirmed that Co/Fe co-doped MoS2 possesses excellent chemical stability and re-usability. [ABSTRACT FROM AUTHOR]

Photo-assisted activation of permonosulfate (PMS) is an effective technology for degradation of organic contaminants. Herein, the cobalt-doped (Co-doped) g-C3N4 photocatalyst was synthesized by the methods of impregnation and calcination. The catalytic activity of Co-doped g-C3N4 catalyst for degradation of RhB in the photo-assisted PMS activation system was obviously higher than that in solo light irradiation or solo PMS-based advanced oxidation processes system. The Co-CN-2 catalyst presents the highest catalytic activity for degradation of RhB in the photo-assisted PMS activation system. 93.5% of RhB was degraded in 10 min by Co-CN-2 catalyst and the kinetic constant of Co-CN-2 catalyst in photo-assisted PMS activation system is 0.267 min−1, which is 3.71 and 7.36 times to that of Co-CN-2 in solo PMS activation and solo light irradiation system, respectively. The enhanced catalytic activity of Co-CN-2 was mainly attributed to the controllable band structure of g-C3N4 by doping cobalt ions as well as excellent activity of cobalt for PMS activation, and the synergistic interaction between the photo-catalytic and PMS activation plays an important role for degradation of organic pollutants. [ABSTRACT FROM AUTHOR]

Active co-catalysts have been extensively used for improving photocatalytic activity in semiconductor-based photocatalytic systems. Herein, 2D alkalized Ti3C2 (Ti3C2-OH) nano-sheets were coupled with CdS via a facile electrostatic self-assembly strategy and combined with hydrothermal method to prepare Ti3C2-OH/CdS photocatalyst. The morphologies, crystal phases, optical and photoelectrical properties of the prepared photocatalysts were characterized by XRD, SEM, TEM, FTIR, PL, and EIS analysis, respectively. The photocatalytic degradation results verified that the photo-degradation performance of Ti3C2-OH/CdS photocatalyst (degradation of 97% RhB in 100 min) was obviously superior to that of pure CdS (degradation of 70% RhB in 100 min) and Ti3C2/CdS (degradation of 82% RhB in 100 min). The active species trapping experiments for Ti3C2-OH/CdS photocatalyst revealed that the superoxide radical (·O2−) and holes (h+) were the predominant species for degradation of RhB. Furthermore, the Ti3C2-OH co-catalyst in the Ti3C2-OH/CdS composite not only played the role of promoting the effective separation of photo-generated electron–hole pairs, but also constructing strong connections with CdS semiconductor to establish heterostructure, ultimately enhancing the photocatalytic performance of the Ti3C2-OH/CdS photocatalyst. [ABSTRACT FROM AUTHOR]