Preparation and Photocatalytic Properties of Composite Photocatalyst β-Bi2O3/BiOCOOH with Hierarchical Structure

doi:10.11901/1005.3093.2019.471

Chinese Journal of Materials Research

2020, Vol. 34

Issue (4): 311-320 DOI: 10.11901/1005.3093.2019.471

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Preparation and Photocatalytic Properties of Composite Photocatalyst β-Bi2O3/BiOCOOH with Hierarchical Structure

XUE Wenxing¹, XIE Liyan²(

), WANG Wanjun³, LIU Minghua¹, HUANG Jianhui²

1.College of Environment and Resources, Fuzhou University, Fuzhou 350002, China
2.College of Environmental and Biological Engineering, Fujian Provincial Key Laboratory of Ecology-toxicological Effects & Control for Emerging Contaminants, Key Laboratory of Ecological Environment and Information Atlas, Fujian Provincial University, Putian University, Putian 351100, China
3.Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China

Cite this article:

XUE Wenxing, XIE Liyan, WANG Wanjun, LIU Minghua, HUANG Jianhui. Preparation and Photocatalytic Properties of Composite Photocatalyst β-Bi2O3/BiOCOOH with Hierarchical Structure. Chinese Journal of Materials Research, 2020, 34(4): 311-320.

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Abstract

The BiOCOOH with multi-layered structure was synthesized by hydrothermal method, and then was used as sacrificial precursor to prepare several different products through adjusting heat treatment temperatures, including a new type of composite photocatalytic material β-Bi₂O₃/BiOCOOH with visible light response. The crystal structure, optical absorption performance, morphology, photocurrent and other physical and chemical properties of the products were characterized by means of X-ray diffraction (XRD), UV-Vis DRS, scanning electron microscope (SEM), photoelectric chemical response and other characterization methods. Their photocatalytic activity was assessed via degradation test of Rhodamine B solution. The results show that when the heat treatment temperature gradually increased from 250℃ to 330℃, 400℃ and 450℃, the following transformation occurred: BiOCOOH→β-Bi₂O₃/BiOCOOH→β-Bi₂O₃→α-Bi₂O₃. The visible light catalytic performance of the composite photocatalyst β-Bi₂O₃/BiOCOOH is the best. The degradation rate of Rhodamine B in the presence of β-Bi₂O₃/BiOCOOH composite photocatalyst was 6.7 times and 100 times higher than those in the presence of β-Bi₂O₃and α-Bi₂O₃, respectively. The samples that showed the best decolorization rate for rhodamine B had a mineralization rate of 88% within 90 minutes of illumination. Electrochemical test results show that the composite β-Bi₂O₃/BiOCOOH has a larger photocurrent response and a smaller impedance than the plain materials β-Bi₂O₃ and BiOCOOH. In addition, by considering both of UV-Vis DRS and Mott-Shottky curves comprehensively, the positions of conduction and valence bands of β-Bi₂O₃ and BiOCOOH can be estimated respectively, and it is speculated that β-Bi₂O₃ and BiOCOOH can be closely combined to form z-type photocatalytic structure, thus having higher separation efficiency of photogenerated carriers and effective separation of photogenerated charges.

Key words: composite visible-light photocatalysis self-sacrificial precursor β-Bi₂O₃/BiOCOOH

Received: 13 October 2019

ZTFLH:

O643.36

Fund: the Natural Science Foundation of Fujian Province(No. 2019N0022);the Natural Science Foundation of Fujian Province(No. 2018J01439);Scientific Project of Putian Science and Technology Bureau(No. 2016S1001);Scientific Project of Putian Science and Technology Bureau(No. 2018NP2001);Science and Technology Project of Fujian Provincial Department of Education(No. JT180468);Program for New Century Excellent Talents in Fujian Province University

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	Wenxing XUE
	Liyan XIE
	Wanjun WANG
	Minghua LIU
	Jianhui HUANG

URL:

https://www.cjmr.org/EN/10.11901/1005.3093.2019.471 OR https://www.cjmr.org/EN/Y2020/V34/I4/311

Fig.1 Schematic diagram of sample preparation process

Fig.2 XRD patterns of samples calcined at different temperatures (a) precursor BiOCOOH; (b) samples with heat treatment temperatures from 250℃ to 280℃; (c) samples with heat treatment temperatures from 300℃ to 350℃; (d) samples with heat treatment temperatures of 400℃ and 450℃

Fig.3 SEM images of BiOCOOH (a) (b), β-Bi₂O₃/BiOCOOH (c) (d), β-Bi₂O₃(e) (f), and α-Bi₂O₃(g) (h)

Fig.4 TEM (a) and HRTEM (b) images of β-Bi₂O₃/BiOCOOH

Fig.5 UV-Vis diffuse reflectance spectra of diffenent samples

Fig.6 Nitrogen adsorption-desorption isotherms of the BiOCOOH，β-Bi₂O₃/BiOCOOH，β-Bi₂O₃and α-Bi₂O₃

Fig.7 (a) The absorption of RhB solution at different irradiation time in the presence of β-Bi₂O₃/BiOCOOH obtained at 330℃. (b) The absorption of RhB solution at different irradiation time in the presence of β-Bi₂O₃ obtained at 400℃. (c) Photocatalytic degradation kinetics of RhB over samples calcined at different temperatures. (d) Linear plots of ln(C₀/C_t) as a function of degradation time

Fig.8 TOC removal of RhB over as-synthesized β-Bi₂O₃/BiOCOOH photocatalytic system

Fig.9 Photocurrent transient responses for BiOCOOH，β-Bi₂O₃ and β-Bi₂O₃/BiOCOOH composites

Fig.10 Nyquist impedance plots of BiOCOOH, β-Bi₂O₃, α-Bi₂O₃ and β-Bi₂O₃/BiOCOOH

Fig.11 Mott-Schottky curve of BiOCOOH and β-Bi₂O₃

Fig.12 Schematic diagram of separation of electron-hole pairs over β-Bi₂O₃/BiOCOOH composites under visible light

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