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|Title:||N-doped graphene from metal-organic frameworks for catalytic oxidation of p-hydroxylbenzoic acid: N-functionality and mechanism|
|Citation:||ACS Sustainable Chemistry and Engineering, 2017; 5(3):2693-2701|
|Publisher:||American Chemical Society|
|Ping Liang, Chi Zhang, Xiaoguang Duan, Hongqi Sun, Shaomin Liu, Moses O. Tade, and Shaobin Wang|
|Abstract:||N-doped graphene has been considered as a promising catalyst with surface metal-free active sites for environmental remediation. Several MIL-100 (Fe)-templated N-doped graphene samples were synthesized using dicyandiamide, melamine, and urea as the nitrogen precursors. Excellent catalytic oxidation of p-hydroxylbenzoic acid (PHBA) was observed on the as-synthesized samples via peroxymonosulfate (PMS) activation. The mechanism was investigated by both electron paramagnetic resonance (EPR, 5,5- dimethyl-1-pyrroline N-oxide and 2,2,6,6-tetramethyl-4-piperidinol as the trapping agents) and quenching tests (ethanol and sodium azide as the radical scavengers). Benzoic acid and furfuryl alcohol were also employed as probing reagents for hydroxyl/sulfate radicals and singlet oxygen, respectively. The results confirmed that singlet oxygen was generated and dominated the PHBA degradation on N-doped graphene, rather than hydroxyl/sulfate radicals. With the novel N-doped graphene, this study illustrates the formation mechanism of nitrogen functionalities for reactive radicals via PMS activation for removal of organic contaminants in water.|
|Keywords:||MIL-100 (Fe); N-doped graphene; environmental catalysis; singlet oxygen; peroxymonosulfate activation|
|Description:||Published: February 13, 2017|
|Rights:||© 2017 American Chemical Society|
|Appears in Collections:||Chemical Engineering publications|
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