Oxidation of gas phase ammonia via accelerated generation of radical species and synergy of photo electrochemical catalysis with persulfate activation by CuO-Co
3O
4 on cathode electrode.
JOURNAL OF HAZARDOUS MATERIALS 2020;
388:121793. [PMID:
31836365 DOI:
10.1016/j.jhazmat.2019.121793]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/21/2019] [Accepted: 11/29/2019] [Indexed: 06/10/2023]
Abstract
To enhance the efficiency of SO4- based advanced oxidation processes (AOPs) in synergy with photocatalysis in eliminating contaminants, heterogeneous CuO-Co3O4 catalysts were synthesized by a co-precipitation method and evaluated in oxidizing ammonia (NH3). The removal of 96.1 % NH3 at room temperature was achieved in persulfate/photo-electrochemical catalysis (PEC/PS). The factors influencing NH3 removal include molar ratios of Cu/Co in CuO-Co3O4, external resistance and PS concentration. The activation of PS is affected by loading of metal oxides catalyst and its Cu/Co molar ratio (2 is optimal). On the catalyst surface, Co and Cu species were the primary reactive sites. The reaction mechanism involves the in-situ PS activation in synergy with PEC, accelerating the production of radical species, thereby enhancing ammonia oxidation and removal.
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