Facile one-step synthesis of onion-like carbon modified ultrathin g-C3N4 2D nanosheets with enhanced visible-light photocatalytic performance

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:533

Article

Wang, Yameng^1,2  Cai, Haoyuan^1,2  Qian, Fangfang^1,2  Li, Yiming^1,2  Yu, Jianqiang³  Yang, Xiaolong³  Bao, Mutai^1,2  Li, Ximing⁴ 

[1] Ocean Univ China, Key Lab Marine Chem Theory & Technol, Minist Educ, 238 Song Ling Rd, Qingdao 266100, Peoples R China

[2] Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China

[3] Qingdao Univ, Sch Chem & Chem Engn, 308 Ning Xia Rd, Qingdao 266071, Peoples R China

[4] Sinopec, Shengli Oilfield Co, Petr Engn Technol Res Inst, Dongying 257000, Peoples R China

关键词: g-C3N4 ultrathin nanosheets;    Agar;    Carbon doped;    Mesoporous;    Visible-light photocatalysis;   

DOI  :  10.1016/j.jcis.2018.08.039

来源: Elsevier

【 摘 要 】

Herein, novel mesoporous carbon-doped g-C3N4 ultrathin nanosheets (C/CNNS) have been synthesized for the first time through a facile one-step thermal condensation method using agar-melamine gel (AMG) as precursor. A series of characterizations were carried out to explore the structure, morphology and optoelectronic properties of the C/CNNS photocatalyst. The resultant C/CNNS-0.5 exhibited the optimum photocatalytic performance with respect to bulk g-C3N4 by using Rhodamine B, Phenol, Bisphenol A and Phenanthrene as target pollutants under visible light irradiation. Such remarkable enhancement of photocatalytic activity was mainly attributed to the synergistic effect of onion-like carbon (OLC) and ultrathin 2D nanosheets structure. The introduction of OLC could effectively expand visible-light absorption regions. Besides, OLC can act as an electron receiver to facilitate charge separation and inhibit the recombination of photogenerated carriers. 2D nanosheets structure provides more active sites for photo catalytic reactions, which further improve photocatalytic activity of C/CNNS-0.5 photocatalyst. The photocatalytic mechanism of C/CNNS for removing organic pollutants was explored by electron spin resonance (ESR) technique. Much different from the bulk g-C3N4, superoxide radical (O-center dot(2)-) and hydroxyl radical ((OH)-O-center dot) were the two main radicals, while for the bulk g-C3N4, there is only the O-center dot(2)- radical worked in the photocatalytic reaction. (C) 2018 Elsevier Inc. All rights reserved.

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