VOCs emission in gas phase or liquid phase need to be well controlled . We prepared monatomic catalyst Co-g-C3N4 and tested its photocatalytic activation of H2O2 and PMS for oxidation of Rhodamine B and liquid phase VOCs; Co atomically dispersed in g-C3N4, increased the visible light response and activity, and reduces the band gap. Co-g-C3N4/H2O2 and Co-g-C3N4/PMS systems were both effective in RhB degradation. The optimum Co loading capacity was 0.35 wt%. The stability tests of Co-g-C3N4/H2O2 and Co-g-C3N4/PMS photo-Fenton-like systems, indicated that Co-g-C3N4/PMS system performs better. In the Co-g-C3N4/PMS (0.1 mM PMS) and Co-gC3N4/H2O2 (9.8 mM H2O2) system, nearly 100% pollutant was degraded in respectively only 2 min and 16 min. The kinetic rate constant of Co-g-C3N4/PMS is 1.57 min<sup>-1</sup> , and the removal capacity is 6.10 g/hg . The best conditions of Co-g-C3N4/PMS system are acidic and/or neutral, and the best conditions of Co-g-C3N4/H2O2 system are neutral. The Co-g-C3N4/PMS system has optimal performance, with PMS 0.10 mM, and catalyst 0.4 g/L . The Co-g-C3N4/PMS generated hydroxyl radical and sulfate radical as the main reactive oxidative species, while the hydroxyl radicals are the main species in Co-g-C3N4/H2O2 system. The use of metal monatomic catalyst to activate oxidants for catalytic oxidation degradation of VOCs provides a new idea for the catalytic oxidation of VOCs.<br/>Another Ag/AgBr/TiO2-ZnO catalyst was also synthesized and tested in the microbial fuel cell as the photoelectrochemical cathodic catalyst for oxidation of VOC absorbed in liquid phase. It improved the performance of PEC-MFC system, to achieve oxidative removal of high concentration VOCs. A single cycle electrocatalysis with microbial fuel cell system (EC-MFC) and a single cycle photo electrochemical catalysis with microbial fuel cell system (PEC-MFC) were  able to remove ethyl acetate and isopropanol  successfully. The double-circulating photo electrochemical catalysis with microbial fuel cell system (PEC-MFC) could rapidly degrade the ethyl acetate in the absorbed solution. In summary, the composite catalytic materials and pollution control research provides new ways of thinking for practical application.

Study on VOCs pollution control by Co-g-C3N4 activating PMS or H2O2 or AgAgBr/ZnO/TiO2 in EC-MFC, PEC-MFC systems

ACS Spring 2022

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