一步法直接合成rGO/Bi2O2CO3及其光催化性能研究

doi:10.15541/jim20170043

摘要/Abstract

摘要：

采用简单易行的一锅水热法, 制备了还原氧化石墨烯(RGO)复合的Bi₂O₂CO₃光催化剂。通过XRD、N₂吸附、XPS、SEM和TEM等测试手段对光催化剂进行表征。结果表明: 石墨烯与Bi₂O₂CO₃纳米片形成了有效复合。在设计吸附饱和排除RGO物理吸附的影响下, 发现复合光催化剂的性能明显提高, 其中RGO复合量为6.0wt%时活性最佳, 其光催化降解RhB的速率是Bi₂O₂CO₃的3.02倍, 并具有良好的循环稳定性。光电谱学分析表明复合RGO有效抑制了光生电子-空穴对的复合, 且拓宽和增强了催化剂的可见光吸收。机理分析表明: RGO/Bi₂O₂CO₃中O₂可多位点捕获光生电子, 从而产生更多活性物种O₂^-·, 实现对污染物的快速有效降解。

关键词: 石墨烯, Bi₂O₂CO₃, 光催化, 活性物种

Abstract:

RGO/Bi₂O₂CO₃ photocatalyst was prepared by one-pot hydrothermal method. The samples were characterized by XRD, N₂ adsorption, XPS, SEM, and TEM. The results indicate that Bi₂O₂CO₃ are effectively composited by the reduced graphene oxide (RGO). The photocatalytic property of RGO/Bi₂O₂CO₃ composite is obviously improved after exclusion of physical adsorption from graphene. Specifically, the sample composited by 6.0wt% RGO shows the best photocatalytic activity with a rate constant as fast as 3.02-folds of Bi₂O₂CO₃ for degradation of RhB. Photoelectrochemical analysis indicate that the introduction of RGO effectively inhibits the recombination of photogenerated e^-/h⁺ pairs and broadens the visible light absorption of Bi₂O₂CO₃. Mechanism exploration shows that more active species O₂^-· is produced due to the multi-site electron capture of O₂ in the composite.

Key words: graphene, Bi₂O₂CO₃, photocatalysis, active species

中图分类号:

TQ174

张国英, 沈星杞, 杨立民, 魏雪敏, 张欣. 一步法直接合成rGO/Bi₂O₂CO₃及其光催化性能研究[J]. 无机材料学报, 2017, 32(11): 1202-1208.

ZHANG Guo-Ying, SHEN Xing-Qi, YANG Li-Ming, WEI Xue-Min, ZHANG Xin. RGO/Bi₂O₂CO₃: One-step Synthesis and Photocatalytic Property[J]. Journal of Inorganic Materials, 2017, 32(11): 1202-1208.

图/表 8

图1 不同样品的XRD图谱

Fig. 1 XRD patterns of different samples (a) Graphite and GO; (b) RGO, BG0% and BG6%

图2 复合光催化剂BG6%的XPS图谱

Fig. 2 XPS spectra of BG6% composite (a) Survey spectrum; (b) O1s; (c) Bi4f of BG 6% and mixing 6%; (d) C1s of GO, BG6% and mixing RGO-6%

图3 BG0% (a, b)和BG6%(c~f)的扫描及透射电镜照片

Fig. 3 SEM and TEM images of BG0% (a, b) and BG6% (c-f)

图4 系列BG样品的 (a) N2吸-脱附等温线和 (b) DRS光谱

Fig. 4 (a) Nitrogen adsorption-desorption isotherms with corresponding pore-size distribution curves (inset) and (b) UV-Vis DRS of series BG samples

图5 (a)系列BG样品光催化降解RhB的活性, BG0% (b)及BG6% (c)对RhB的光催化降解过程及相应动力学曲线(插图), (d) BG6%的循环性能

Fig. 5 Photocatalytic activity of BG samples (a), temporal evolution of RhB absorption spectra over BG0%(b) and BG 6% (c) with corresponding dynamic plots (inset), circulation runs of BG6% photocatalyst (d)

图6 系列BG光催化剂的 (a)荧光光谱和(b)电化学阻抗谱

Fig. 6 (a) PL spectra and (b) EIS Nyquist curves of pure BOC and BG composites

图7 捕获剂对BG6%光催化降解RhB的影响

Fig. 7 Effects of scavengers on the degradation of RhB over BG6% photocatalyst

图8 RGO/BOC的界面电荷分离与迁移示意图

Fig. 8 Schematic illustration of charge migration on the interface of RGO/BOC

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一步法直接合成rGO/Bi₂O₂CO₃及其光催化性能研究

RGO/Bi₂O₂CO₃: One-step Synthesis and Photocatalytic Property

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