g-C3N4/MoS2纳米片/氧化石墨烯三元复合催化剂的制备及可见光催化性能

doi:10.15541/jim20170263

摘要/Abstract

摘要：

采用球磨法制备 g-C₃N₄/MoS₂纳米片/氧化石墨烯(GO)三元复合催化剂。运用X 射线衍射(XRD)、透射电子显微镜(TEM)、紫外-可见吸收光谱(UV-Vis)和光致激发光谱(PL)等分析手段, 对催化剂的结构、形貌和光学性能进行表征。结果表明: MoS₂纳米片和g-C₃N₄形成异质结结构, 均匀地分散在氧化石墨烯的表面上。以罗丹明B(RhB)为模拟污染物, 研究三元复合催化剂在可见光照射下的光催化特性。结果显示: 三元复合催化剂在120 min内对RhB的降解率达到96%, 其降解动力学常数分别是g-C₃N₄、g-C₃N₄/ MoS₂、g-C₃N₄/GO复合催化剂的3、2.1和2.8倍。根据实验结果及能带结构提出了三元复合催化剂可能的光催化机理。

关键词: 氮化碳, 二硫化钼纳米片, 氧化石墨烯, 光催化

Abstract:

The g-C₃N₄/MoS₂ nanosheets/graphene oxide (GO) ternary composite photocatalyst was successfully prepared by a ball milling method. Its structure, morphology and optical property were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis absorption spectroscopy (DRS), and photoluminescence spectroscopy (PL), respectively. The results indicated that the heterogeneous structure of MoS₂ nanosheets and g-C₃N₄ were formed on the surface of GO. The photocatalytic activity of the photocatalyst was evaluated by degradation of organic Rhodamine B (RhB) under visible light irradiation. The ternary composite photocatalyst could degrade 96% of RhB within 120 min, about 3, 2.1 and 2.8 times higher than that of the g-C₃N₄, g-C₃N₄/MoS₂ composite and g-C₃N₄/GO composite. Based on the experimental results and the band structure, a possible charge transfer mechanism of ternary composite photocatalyst was proposed.

Key words: carbon nitride, molybdenum disulfide nanosheets, graphene oxide, photocatalysis

中图分类号:

O643

阎鑫, 卢锦花, 惠小艳, 闫从祥, 高强, 孙国栋. g-C₃N₄/MoS₂纳米片/氧化石墨烯三元复合催化剂的制备及可见光催化性能[J]. 无机材料学报, 2018, 33(5): 515-520.

YAN Xin, LU Jin-Hua, HUI Xiao-Yan, YAN Cong-Xiang, GAO Qiang, SUN Guo-Dong. Preparation and Visible Light Photocatalytic Property of g-C₃N₄/MoS₂ Nanosheets/GO Ternary Composite Photocatalyst[J]. Journal of Inorganic Materials, 2018, 33(5): 515-520.

图/表 8

图1 GO、MoS2纳米片、g-C3N4、g-C3N4/GO、g-C3N4/MoS2纳米片、g-C3N4/MoS2纳米片/GO复合催化剂的XRD图谱

Fig. 1 XRD patterns of GO, MoS2 nanosheets, g-C3N4, g-C3N4/GO, g-C3N4/MoS2 nanosheets, g-C3N4/MoS2 nanosheets/ GO photocatalyst

图2 g-C3N4/MoS2纳米片/GO复合催化剂的透射电镜照片(a)和高分辨电镜照片(b)

Fig. 2 TEM (a) and HRTEM (b) images of g-C3N4/MoS2 nanosheets/GO ternary composite photocatalyst

图3 g-C3N4、g-C3N4/GO、g-C3N4/MoS2纳米片、g-C3N4/MoS2纳米片/GO复合催化剂的UV-Vis吸收光谱图

Fig. 3 UV-Vis absorption spectra of g-C3N4, g-C3N4/GO, g- C3N4/MoS2 nanosheets, g-C3N4/MoS2 nanosheets/GO photocatalyst

图4 g-C3N4、g-C3N4/GO、g-C3N4/MoS2纳米片、g-C3N4/MoS2纳米片/GO复合催化剂的荧光发射光谱图

Fig. 4 PL spectra of g-C3N4, g-C3N4/GO, g-C3N4/MoS2 nanosheets, g-C3N4/MoS2 nanosheets/GO photocatalyst

图5 g-C3N4、g-C3N4/GO、g-C3N4/MoS2纳米片、g-C3N4/MoS2纳米片/GO复合催化剂对RhB的光催化降解曲线

Fig. 5 Degradation curves of RhB by g-C3N4, g-C3N4/GO, g- C3N4/MoS2 nanosheets, g-C3N4/MoS2 nanosheets/GO photocatalyst

图6 g-C3N4、g-C3N4/GO、g-C3N4/MoS2纳米片、g-C3N4/MoS2纳米片/GO复合催化剂对RhB的动力学拟合线

Fig. 6 Kinetic plots of photocatalytic degradation of RhB by g-C3N4, g-C3N4/GO, g-C3N4/MoS2 nanosheets, g-C3N4/MoS2 nanosheets/GO photocatalyst

图7 不同催化剂在可见光下照射120 min后对降解RhB溶液中TOC 的去除率

Fig. 7 TOC removal efficiencies of the degraded RhB solution over different samples under visible light irradiation for 120 min

图8 g-C3N4/MoS2纳米片/GO复合催化剂光催化机理示意图

Fig. 8 Schematic diagram of the photocatalytic degradation and charge transfer mechanism in the g-C3N4/MoS2 nanosheets/GO photocatalyst

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g-C₃N₄/MoS₂纳米片/氧化石墨烯三元复合催化剂的制备及可见光催化性能

Preparation and Visible Light Photocatalytic Property of g-C₃N₄/MoS₂ Nanosheets/GO Ternary Composite Photocatalyst

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