Citation: Zhen Shen, Yipeng Zhou, Yue Guo, Jie Zhao, Jianhua Song, Yu Xie, Yun Ling, Wei Zhang. Tuning the concentration of surface/bulk oxygen vacancies in CeO₂ nanorods to promote highly efficient photodegradation of organic dyes[J]. Chinese Chemical Letters, ;2021, 32(8): 2524-2528. doi: 10.1016/j.cclet.2021.01.044 shu

Tuning the concentration of surface/bulk oxygen vacancies in CeO₂ nanorods to promote highly efficient photodegradation of organic dyes

Zhen Shen ^{a, b, 1} ,
Yipeng Zhou ^{a, 1} ,
Yue Guo ^b ,
Jie Zhao ^{a, b, **,} ,
Jianhua Song ^a ,
Yu Xie ^{a, *,} ,
Yun Ling ^a ,
Wei Zhang ^{c, *,}

a.
Department of Material Chemistry, Nanchang Hangkong University, Nanchang 330063, China
b.
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
c.
School of Ecology and Environment Science, Zhengzhou University, Zhengzhou 450001, China

^**

zhaojienju@163.com

xieyu_121@163.com

zhangwei88@zzu.edu.cn

Received Date: 20 November 2020
Revised Date: 23 December 2020
Accepted Date: 22 January 2021
Available Online: 27 January 2021

Figures(4)

To enhance the photodegradation ability of CeO₂ for organic dyes, an effective strategy is to introduce oxygen vacancies (V_o). In general, the introduced V_o are simultaneously present both on the surface and in the bulk of CeO₂. The surface oxygen vacancies (V_o-s) can decrease the band gap, thus enhancing light absorption to produce more photogenerated e⁻ for photodegradation. However, the bulk oxygen vacancies (V_o-b) will inhibit photocatalytic activity by increasing the recombination of photogenerated e⁻ and V_o-b. Therefore, regulating the concentrations of V_o-s to V_o-b is a breakthrough for achieving the best utilization of photogenerated e⁻ during photodegradation. We used an easy hydrothermal method to achieve tunable concentrations of V_o-s to V_o-b in CeO₂ nanorods. The optimized CeO₂ presents a 70.2% removal of rhodamine B after 120 min of ultraviolet−visible light irradiation, and a superior photodegradation performance of multiple organics. This tuning strategy for V_o also provides guidance for developing other advanced metal-oxide semiconductor photocatalysts for the photodegradation of organic dyes.
- CeO₂,
- Nanorods,
- Oxygen vacancy,
- Photodegradation,
- Organic pollutant
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Tuning the concentration of surface/bulk oxygen vacancies in CeO2 nanorods to promote highly efficient photodegradation of organic dyes

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通讯作者: 陈斌, bchen63@163.com

Tuning the concentration of surface/bulk oxygen vacancies in CeO₂ nanorods to promote highly efficient photodegradation of organic dyes