Ultrasonic-assisted synthesis of mesoporous g-C3N4/Na-bentonite composites and its application for efficient photocatalytic simultaneous removal of Cr(VI) and RhB

被引：49
作者：
Guo, Yadan [1 ,2 ]
Li, Chenxi [2 ]
Guo, Yiqin [2 ]
Wang, Xuegang [1 ,2 ]
Li, Xiaomeng [2 ]
机构：
[1] East China Univ Technol, State Key Lab Nucl Resources & Environm, Nanchang 330013, Jiangxi, Peoples R China
[2] East China Univ Technol, Sch Water Resources & Environm Engn, 418 Guanglan Rd, Nanchang 330013, Jiangxi, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2019年 / 578卷
基金：
中国国家自然科学基金;
关键词：
Ultrasound-assisted; g-C3N4; Na-bentonite; Cr(VI); RhB/Cr(VI)mix-system; ORGANIC POLLUTANTS DEGRADATION; RHODAMINE-B; Z-SCHEME; FACILE SYNTHESIS; HYBRID PHOTOCATALYST; REDUCTION; PERFORMANCE; G-C3N4; BENTONITE; NANOCOMPOSITES;
D O I：
10.1016/j.colsurfa.2019.123624
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：
Graphitic carbon nitride (g-C3N4) is a new type of nonmetal polymeric semiconductor photocatalyst for removal of pollutants. To overcome the low BET surface and the low electron-hole recombination rate of the g-C3N4 photocatalysts, we successfully synthesized g-C3N4/Na-bentonite composites using an ultrasonic-assisted method. The XRD showed that the composite was composed of g-C3N4 and Na-bentonite. The analyses of TEM and XPS indicated that graphite carbon nitride was successfully intercalated on Na-bentonite via the ultrasonicassisted strategy, and the g-C3N4/Na-bentonite nanocomposites presented remarkable light absorption capacities and mesoporous structure observed by UV-vis DRS and BET method. In addition, the as-prepared composites can be used for the photocatalytic removal of single RhB or Cr(VI), and the efficiencies of the Cr(VI) reduction are increased from 53.2% to 88.6% in RhB/Cr(VI) mix-system. Superior stability and high efficiencies of g-C3N4/Nabentonite composites were also exhibited for up to 4 cycles. The photocatalytic enhancement was due to the strong adsorption and the higher charge separation efficiency of as-prepared g-C3N4/Na-bentonite composites.
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页数：9
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