Construction of NH2-MIL-101(Fe)/g-C3N4 hybrids based on interfacial Lewis acid-base interaction and its enhanced photocatalytic redox capability

被引：29
作者：
Chen, Feng [1 ,2 ]
Wang, Huihu [1 ,2 ]
Hu, Haiping [1 ,2 ]
Gan, Jianchang [1 ,2 ]
Su, Ming [1 ,2 ]
Xu, Huang [1 ,2 ]
Wei, Chenhuinan [1 ,2 ]
机构：
[1] Hubei Univ Technol, Hubei Prov Key Lab Green Mat Light Ind, Wuhan, Peoples R China
[2] Hubei Univ Technol, Sch Mat & Chem Engn, Wuhan 430068, Hubei, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2021年 / 631卷
关键词：
g-C3N4; NH2-MIL-101(Fe); Heterojunction; Ciprofloxacin degradation; Cr(VI) reduction; METAL-ORGANIC FRAMEWORK; EFFICIENT REMOVAL; DEGRADATION; REDUCTION; TIO2; CIPROFLOXACIN; G-C3N4; HETEROJUNCTION; PERFORMANCE; COMPOSITES;
D O I：
10.1016/j.colsurfa.2021.127710
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Good interfacial bonding is an important factor to improve the photocatalytic activity of heterojunctions. In this work, a novel hybrid composed of NH2-MIL-101(Fe) and carboxylated g-C3N4 (CCN) was synthesized by a facile hydrothermal method based on interfacial Lewis acid-base interaction. By carboxylating the surface of g-C3N4 bulks, the surface acidic center -COOH is constructed, which can interact with the basic center -NH2 on the surface of NH2-MIL-101(Fe). As a result, a good interface binding and electron channel between them are formed, thus accelerating the separation of photogenerated electron-hole pairs and improve the photocatalytic activity of hybrids. The maximum ciprofloxacin degradation efficiency over 15% NH2-MIL-101(Fe)/CCN was 94% within 120 min under visible light irradiation. h(+) and center dot OH are the main active species in the ciprofloxacin degradation process. In addition, the reduction efficiency of Cr(VI) over 10% NH2-MIL-101(Fe)/CCN reached 76% within 60 min, which was 2.71 and 1.62 times higher than pure CCN and NH2-MIL-101(Fe). The addition of ammonium oxalate can effectively enhance the Cr(VI) reduction efficiency by accelerating the dynamic process of the electron-hole pairs separation. The photocatalytic mechanism for ciprofloxacin degradation and Cr(VI) reduction over NH2-MIL-101(Fe)/CCN hybrid was proposed.
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页数：12
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