Pan Yusong,Zhu Yuan,Wang Yuanqing,Huang Run,Pan Chengling
Based on the strong capability of transition metal ions for peroxymonosulfate (PMS) activation and highly affinity of MoS 2 towards PMS, thus decorating MoS 2 with transition metal ions would efficiently activate PMS for degradation of organic pollutants. In this work, Co/Fe co-doped MoS 2 catalyst were synthesized by simple chemical method. The prepared Co/Fe co-doped MoS 2 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 1 O 2 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 MoS 2 catalyst. The cycle experiments confirmed that Co/Fe co-doped MoS 2 possesses excellent chemical stability and re-usability.
Peng Liu,Dengjie Zhong,Yunlan Xu,Nianbing Zhong,Guangjun He
Co/Fe co-doped porous graphite carbon (Co/Fe-PGC) nanocomposites were successfully prepared by one-step pyrolysis with CoFe-MOF, in which the Co/Fe nanoparticles were uniformly coated on porous graphite carbon derived from MOF. It was used to microelectrolysis-Fenton degrade rhodamine B through the main active substance ∙OH. The color and TOC removal rate of 100 mg/L rhodamine B reached 99.41% and 64.6%, respectively, for 30 min. Rhodamine B was degraded into small molecular organic acids, alcohols and lipids by N-demethylation and chromophore cleavage, until it was finally degraded into CO 2 and H 2 O, and no new colored organics were produced in the degradation process. The degradation process follows the first-order reaction kinetics, and its rate constant is much higher than that of the previous similar studies. The excellent catalytic performance of Co/Fe-PGC catalyst is attributed to the coupling effect of micro-electrolysis and Fenton reaction, and the acceleration of cobalt on electron transport and Fe 2+ reduction. Co 0 /Fe 0 undergoes galvanic corrosion to generate Co 2+ /Fe 2+ and H 2 O 2 , and then these products undergo Fenton reaction to generate Co 3+ /Fe 3+ and ∙OH, thus forming a circulating system of Co 3+ /Fe 3+ and Co 2+ /Fe 2+ , enhancing the activation of H 2 O 2 and ensuring the efficient degradation of RhB.
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