Q[6]/CdS-Ag2S复合光催化剂的合成及光催化性质

doi:10.15541/jim20190323

摘要/Abstract

摘要：

CdS因具有独特的光电化学性能而被广泛用于光催化研究, CdS与窄带隙半导体和有机物复合是重要的光催化研究方向。研究采用化学沉淀法制备了六元瓜环(Q[6])复合和Ag₂S掺杂的硫化镉光催化剂(Q[6]/CdS-Ag₂S), 通过不同手段对复合催化剂进行表征。实验以可见光为光源, 罗丹明B为模拟污染物, 考察了六元瓜环对CdS-Ag₂S光催化性能的影响。结果表明: 经Q[6]复合后的Q[6]/CdS-Ag₂S形貌为菜花状, 颗粒粒径变小。复合催化剂Q[6]/CdS-Ag₂S的催化性能明显优于CdS-Ag₂S, 光催化反应110 min, 15 mg复合催化剂对100 mL 6 mg/L罗丹明B溶液的催化降解效率达到92.4%。

关键词: 六元瓜环, 复合催化剂, 光催化, 染料

Abstract:

CdS is widely used in photocatalytic research due to its unique photoelectrochemical properties. CdS recombination with narrow bandgap semiconductors and organic compounds plays an important role in photocatalyst exploration. In this study, a cucurbit[6]uril (Q[6]) composite and Ag₂S-doped cadmium sulfide photocatalyst (Q[6]/CdS-Ag₂S) were prepared by chemical precipitation method and their composite was characterized by different methods. The experiment is designed to use visible light as the light source and Rhodamine B as the simulated pollutant. Meanwhile, the effects of Q[6] on the photocatalytic performance of CdSAg₂S were investigated. The results showed that the morphology of Q[6]/CdS-Ag₂S composite after cucurbit[6]uril recombination was similar to cauliflower, while the particle size become smaller. Catalytic performance of the composite catalyst Q[6]/CdS-Ag₂S was significantly higher than that of CdS-Ag₂S, the photocatalytic reaction lasts 110 min, showing the catalytic degradation effciency of 92.4% using 15 mg composite catalyst on 100 mL, 6 mg/L Rhodamine B solution.

Key words: cucurbit[6] uril, composite catalyst, photocatalysis, dye

中图分类号:

O614

彭章美,赵安婷,付茂芬. Q[6]/CdS-Ag₂S复合光催化剂的合成及光催化性质[J]. 无机材料学报, 2020, 35(6): 703-708.

PENG Zhangmei,ZHAO Anting,FU Maofen. Synthesis and Photocatalytic Properties of Cucurbit[6]uril/CdS-Ag₂S Composite Photocatalyst[J]. Journal of Inorganic Materials, 2020, 35(6): 703-708.

图/表 7

图1 CdS(a), Q[6]/CdS-Ag2S(b, c)的SEM照片(插图为EDS图谱)及CdS-Ag2S(d)的HRTEM照片

Fig. 1 SEM images of CdS (a), Q[6]/CdS-Ag2S (b, c) with inset in (b) showing the corresponding EDS mapping and HRTEM image of CdS-Ag2S (d)

图2 CdS和Q6/CdS-Ag2S的XRD图谱

Fig. 2 XRD pattems of CdS and Q[6]/CdS-Ag2S

图3 CdS、CdS-Ag2S和Q[6]/CdS-Ag2S的固体荧光光谱图

Fig. 3 Solid fluorescence spectra of CdS, CdS-Ag2S and Q[6]/CdS-Ag2S

图4 CdS-Ag2S和Q[6]/CdS-Ag2S的拉曼光谱

Fig. 4 Raman spectra of CdS-Ag2S and Q[6]/CdS-Ag2S

图5 Q[6]/CdS-Ag2S(a)和15 mg不同催化剂(b)的催化降解罗丹明B的曲线图; Q[6]/CdS-Ag2S的紫外可见光谱图(c)及循环实验图(d)

Fig. 5 Photocatalytic degradation of Rhodamine B by Q[6]/CdS-Ag2S(a) and 15 mg different catalysts (b); UV-visible spectra varied with reaction time (c) and cyclic experiment (d) of Q[6]/CdS-Ag2S

图6 抑制剂EDTA(a)、甲醇(b)和异丙醇(c)对Q[6]/CdS-Ag2S降解罗丹明B的影响

Fig. 6 Effect of inhibitors EDTA (a), methanol (b) and isopropanol (c) on degradation Rhodamine B by Q[6]/CdS-Ag2S

图7 Q[6]/CdS-Ag2S光催化降解罗丹明B的机理示意图

Fig. 7 Mechanism diagram of photocatalysis of degradation of Rhodamine B by Q[6]/CdS-Ag2S

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Q[6]/CdS-Ag₂S复合光催化剂的合成及光催化性质

Synthesis and Photocatalytic Properties of Cucurbit[6]uril/CdS-Ag₂S Composite Photocatalyst

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