Abstract
Heterogeneous sulphate radical based advanced oxidation processes (SR-AOPs) have lately been raised as a promising candidate for water treatment. Despite the progress made, either the stability or the performance of the current catalysts is still far from satisfactory for practical applications. Herein, using polydopamine-cobalt ion complex that inspired by mussel proteins as medium, we facilely fabricate a robust SR-AOPs catalyst with cobalt nanoparticles (NPs) embedded in nitrogen-doped reduced graphene oxide matrix (NRGO@Co). The NRGO scaffold with high porosity and surface area not only stabilizes the NPs but also greatly facilitates the accessibility and adsorption of substrates to the active sites. With the synergistic effect arising from the NRGO and Co NPs, the NRGO@Co hybrid catalyst exhibits enhanced catalytic activity for activation of peroxymonosulfate (PMS) to degrade organic pollutants in water. Furthermore, taking advantage of the favorable magnetic properties, the catalyst can be easily recycled and reused for at least 4 runs with negligible loss of activity. Coupled with systematic investigation in terms of influential factors, mineralization, and radicals identification, make the catalyst hold significant potential for application in remediation of organic pollutants in water.
Highlights
Heterogeneous sulphate radical based advanced oxidation processes (SR-AOPs) have lately been raised as a promising candidate for water treatment
It is envisioned that utilizing nitrogen-doped reduced graphene oxide (NRGO) sheets to support metal nanoparticles (NPs) as catayst for SR-AOPs would exhibit enhanced performance because that: (1) the highly conductive NRGO may facilitate the activation of oxidants in AOPs; (2) the graphitic carbon may offer adsorptive domains for enrichment of organic pollutants in proximity to catalysts[30]
The synthesis route of nitrogen-doped reduced graphene oxide matrix (NRGO@Co) composite is illustrated in Fig. 1, which involves in situ polymerization of dopamine with Co species on Graphene oxide (GO) surface followed by carbonization
Summary
Heterogeneous sulphate radical based advanced oxidation processes (SR-AOPs) have lately been raised as a promising candidate for water treatment. It is envisioned that utilizing NRGO sheets to support metal nanoparticles (NPs) as catayst for SR-AOPs would exhibit enhanced performance because that: (1) the highly conductive NRGO may facilitate the activation of oxidants in AOPs; (2) the graphitic carbon may offer adsorptive domains for enrichment of organic pollutants in proximity to catalysts[30]. Using dopamine-cobalt ion complex as medium, we facilely fabricate N-doped graphitic layers supported Co NPs (NRGO@Co hybrids) with a regular morphology and demonstrate their application in serving as a novel SR-AOPs catalyst for pollutants removal.
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