正六棱型MoO3-x微米柱光催化剂的制备及性能

引用本文: 唐飞, 杜多勤, 谭芸妃, 秦莉晓. 正六棱型MoO_3-x微米柱光催化剂的制备及性能[J]. 应用化学, 2021, 38(1): 92-98. doi: 10.19894/j.issn.1000-0518.190335 shu

Citation: Fei TANG, Duo-Qin DU, Yun-Fei TAN, Li-Xiao QIN. Preparation and Characterization of MoO_3-x Hexagonal Microrods as High-Efficiency Photocatalysts[J]. Chinese Journal of Applied Chemistry, 2021, 38(1): 92-98. doi: 10.19894/j.issn.1000-0518.190335 shu

正六棱型MoO_3-x微米柱光催化剂的制备及性能

唐飞 ^{1, 2,} ,
杜多勤 ^1, ,
谭芸妃 ^1, ,
秦莉晓 ^{1,
,}

1.
重庆大学化学化工学院, 重庆 401331
2.
重庆斯泰克瑞登梅尔材料技术有限公司, 重庆 401221

通讯作者: 秦莉晓, E-mail: lxqin@cqu.edu.cn

基金项目:
国家自然科学基金 21776025

中央高校基本科研业务费 2018CDKYGL0002

中央高校基本科研业务费 2018CDKYHG0028

重庆市基础研究与前沿技术研究计划 CSTC2016JCYJA0474

摘要: 首先采用低温水相合成法制备了正六棱型MoO₃微米柱，然后以抗坏血酸为还原剂一步还原法制备了一种表面氧空位可控的MoO_3-x光催化材料。MoO_3-x具有较窄的禁带宽度和较大的光吸收范围。以罗丹明B为模拟污染物的光催化降解实验表明，随着氧空位的增加，MoO_3-x的催化活性明显增加。对于Mo⁵⁺摩尔分数为20.1%的MoO_2.799样品，降解90%的初始质量浓度为10 mg/L的罗丹明溶液只需要60 min。本研究为高性能半导体光催化材料的制备提供了一种新思路。

关键词:

English

Preparation and Characterization of MoO_3-x Hexagonal Microrods as High-Efficiency Photocatalysts

1.
School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
2.
Chongqing Star-Tech & JRS Specialty Products Co. Ltd., Chongqing 401221, China

Corresponding author: Li-Xiao QIN, lxqin@cqu.edu.cn

Received Date: 16 December 2019
Accepted Date: 14 August 2020
Available Online: 10 January 2021
Fund Project:
the National Natural Science Foundation of China

the Fundamental Research Funds for the Central Universities

the Fundamental Research Funds for the Central Universities

Chongqing Research Program of Basic Research and Frontier Technology

Abstract: Hexagonal MoO_3-x microrods with rich surface oxygen vacancies were prepared from MoO₃ using a facile and controllable one-step reduction method with ascorbic acid as the reducing agent. The as-prepared MoO_3-x microrods exhibit much better photocatalytic activity than MoO₃ for degrading Rhodamine B due to the narrower band gap and wider range of sunlight absorption. Moreover, the photocatalytic activity of MoO_3-x increases significantly with an increase in surface oxygen vacancies. For the MoO_2.799 sample with a Mo⁵⁺ content of 20.1%, it only takes 60 minutes to degrade 90% of Rhodamine B in a solution with an initial concentration of 10 mg/L. This study may present a new strategy to synthesize semiconductor photocatalysts.

Key words:

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图 1 MoO₃ (A)和MoO_3-x (B)的SEM照片

Figure 1 SEM images of MoO₃ (A) and MoO_3-x(B)

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图 2 MoO₃和MoO_3-x 的XRD图

Figure 2 XRD patterns of MoO_3-x and MoO₃ samples

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图 3 MoO₃和不同改性时间下MoO₃的XPS图(A-G)和MoO_3-x中Mo⁵⁺含量随改性时间的变化曲线(H)

Figure 3 XPS images of MoO₃ (A) and the reduced MoO_3-x powders modified at 0.5 (B), 1 (C), 2 (D), 4 (E), 8 (F) and 10 h (G), and (H) the effect of reaction time on the Mo⁵⁺ content of MoO_3-x

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图 4 MoO₃和MoO_2.799的紫外可见漫反射光谱(A)和(hv)²与hv的关系图(B)

Figure 4 UV-Vis spectra of MoO₃ and MoO_2.799(A) and the plot of (hv)² vs hv (B)

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图 5 MoO₃及MoO_3-x对罗丹明B的降解率

Figure 5 Catalytic degradation of RB on the MoO₃ and MoO_3-x powders

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