竹炭负载氧空位型BiOI/BiOCl复合光催化剂脱硝机理

夏旻; 赵然; 龚小丽; 秦俊琪; 王寒梅; 夏东升; 王栋

竹炭负载氧空位型BiOI/BiOCl复合光催化剂脱硝机理

1.
武汉纺织大学环境工程学院, 湖北武汉 430200
2.
武汉纺织大学材料科学与工程学院, 湖北武汉 430200

基金项目:

湖北省教育厅青年人才项目 Q20151605

纺织新材料及其应用湖北省重点实验室开放课题 Fzxcl2017004

生物质纤维与生态染整湖北省重点实验室开放课题 STRZ2017005

详细信息

中图分类号: X511
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- 被引次数: 0
出版历程
- 收稿日期: 2017-07-04
- 修回日期: 2017-10-24
- 网络出版日期: 2021-01-23
- 刊出日期: 2017-12-10

Mechanism for NO_x removal over the bamboo charcoal supported BiOI/BiOCl composite photocatalyst with oxygen vacancy

1.
School of Environmental Engineering, Wuhan Textile University, Wuhan 430200, China
2.
School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China

Funds:

the Scientific Research Plan Project of Education Department of Hubei Q20151605

Open Source Project of Hubei Key Laboratory of Advanced Textile Materials & Application Fzxcl2017004

Open Source Project of Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing STRZ2017005

More Information

Corresponding author: ZHAO Ran, Tel:15271863943, E-mail:ranzhao.hust@gmail.com

摘要

摘要: 以竹炭为载体，采用溶剂热法制备了氧空位（OV）型BiOI/BiOCl光催化剂，考察了温度和光照强度对其催化脱硝性能的影响，采用SEM、XPS、XRD、PL、Uv-vis等表征方法研究了该复合光催化剂上的脱硝机理。结果表明，在氙灯功率500 W、温度30 ℃时，最佳脱硝效率可达73%。氧空位改性可以增大竹炭的比表面积和孔容，提高其吸附能力，同时使C=O双键和-COO形式的酸性官能团分解为C-O官能团；OV改性还增加了光催化活性位点，减少了电子空穴对复合概率，从而提高了对NO的光催化降解效率。
- 光催化 /
- 氧空位 /
- 脱硝 /
- BiOI /
- BiOCl /
- 竹炭
Abstract: BiOI/BiOCl composite photocatalysts with oxygen vacancy (OV) were successfully synthesized by solvothermal method with bamboo charcoal (BC) as the carrier. The effect of temperature and light on the catalytic performance in the removal of NO_x was considered and the photocatalytic reaction mechanism was investigated with the assistance of SEM, XPS, XRD, PL and Uv-vis analysis. The results indicated that optimum denitrification efficiency of 73% can be achieved under 30℃ and with a xenon lamp of 500 W. After the modification with the OV agents, the specific surface area and pore capacity of BC were greatly enhanced; the adsorption capacity was also improved and the functional groups of C=O and -COO can be efficiently broken into C-O functional groups. Meanwhile, the modification with OV agents can increase the photocatalytically active sites, reduce the recombination rate of electron hole pairs, and thus improve the efficiency of NO photocatalytic degradation.
- photocatalysis /
- oxygen vacancy /
- NO degradation /
- BiOI /
- BiOCl /
- bamboo charcoal

HTML全文

图 1 实验装置示意图

Figure 1 Schematic diagram of the experimental setup

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图 2 BC/Bi和BC/Bi-OV的SEM照片

Figure 2 SEM images of BC/Bi and BC/Bi-OV

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图 3 BC/Bi和BC/Bi-OV的XRD谱图

Figure 3 XRD patterns of the BC/Bi and BC/Bi-OV

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图 4 BC/Bi和BC/Bi-OV XPS全谱图、Bi 4f谱图、BC/Bi和BC/Bi-OV的C 1s分峰

Figure 4 (a) XPS full spectra, (b) Bi 4f spectra of the BC/Bi and BC/Bi-OV, (c) C 1s peaks of BC/Bi, (d) C 1s peaks of BC/Bi-OV

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图 5 BC/Bi和BC/Bi-OV的PL发射光谱(λ_ex=354 nm)和Uv-vis吸收光谱谱图

Figure 5 PL emission spectra (λ_ex=354 nm) (a) and Uv-vis absorption spectra (b) of BC/Bi and BC/Bi-OV

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图 6 温度对BC/Bi-OV脱硝效率的影响

Figure 6 Effect of temperature on the denitration efficiency

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图 7 光照强度对BC/Bi-OV脱硝效率和OV改性的影响

Figure 7 Effect of light intensity on denitrification efficiency over BC/Bi-OV (a) and effect of OV modification on the denitrification efficiency (b)

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图 8 BC/Bi-OV的脱硝机理示意图

Figure 8 Reaction mechanism for the NO degradation over BC/Bi-OV

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表 1 基于XPS光谱C 1s不同官能团的相对含量

Table 1 Relative content of various functional groups based on the C 1s XPS spectra

Functional group /%	Binding energy E/eV	Half peak width E/eV	Relative content w/%
Functional group /%	Binding energy E/eV	Half peak width E/eV	BC/Bi	BC/Bi-OV
Graphite carbon	284.3±0.2	1.4±0.2	14.14	26.98
C-O	285.0±0.5	2.0±0.3	18.61	36.01
C=O	286.5±0.4	2.3±0.2	45.39	15.00
-COO	288.5±0.4	2.1±0.5	14.71	4.43
π-π^*	290.4±0.3	2.6±0.3	7.15	17.58

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