APPLIED SURFACE SCIENCE
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2017
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IF 3.387
Yuan Bian,Yongjin Ma,Yanyang Shang,Pengfei Tan,Jun Pan
Bi 2 O 2 CO 3 with a narrow band gap ( Eg ∼ 2.93 eV) was self-assembled by Bi 2 O 2 CO 3 nanosheets via a hydrothermal method, and the β-Bi 2 O 3 /Bi 2 O 2.33 @Bi 2 O 2 CO 3 composites were further fabricated using Bi 2 O 2 CO 3 as template by slow thermal decomposition for 4 h, described as: Bi 2 O 2 CO 3 → β-Bi 2 O 3 /Bi 2 O 2.33 @Bi 2 O 2 CO 3 (300 °C) → β-Bi 2 O 3 /Bi 2 O 2.33 (320 °C) → β-Bi 2 O 3 (350 °C). Deep investigation towards the generation and existence of β-Bi 2 O 3 and Bi 2 O 2.33 on the surfaces and interfaces of Bi 2 O 2 CO 3 were also carefully conducted by XRD, HRTEM and XPS analysis. In comparison with pure Bi 2 O 2 CO 3 , β-Bi 2 O 3 /Bi 2 O 2.33 @Bi 2 O 2 CO 3 displayed superior photocatalytic degradation efficiency and stability to cationic dyes under visible-light irradiation. Especially, the as-prepared BOC–300 °C with relatively high specific surface area (12.11 m 2 g −1 ) could entirely remove Rh-B and MB in 45 min and 60 min, which were approximately 4.7 and 6.6 times as high as that of pure Bi 2 O 2 CO 3 , respectively. Further study demonstrated that the enhanced photocatalytic degradation efficiency of β-Bi 2 O 3 /Bi 2 O 2.33 @Bi 2 O 2 CO 3 is surely owing to the well matched band gap and p - n heterojunction, which made it possible for much faster charge transfer rather than electron-hole pairs recombination process.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Sheng-Zhe Zhao,Yi Yang,Ran Lu,Yan Wang,Hong-Lan Huang,Yong-Da Hu,Raul D. Rodriguez,Jin-Ju Chen
The removal of organic contaminants from water poses a significant challenge that can be tackled by integrating adsorption and photocatalytic degradation functions in a single architecture. However, traditional powdery nanomaterials face challenges in separation and lack synergistic function, hampering their practical application. This study presents a one-step hydrothermal synthesis of a convenient recyclable Bi 2 O 2.33 /Bi 2 O 3 @ECNF (electrospun carbon nanofibers), which combines both adsorption and photocatalytic performance. The Bi 2 O 2.33 /Bi 2 O 3 exhibits high adsorption removal of methyl orange (MO), reaching 94.56 % and a maximum capacity of 213.13 mg g −1 . Additionally, the Bi 2 O 2.33 /Bi 2 O 3 shows a high charge transfer rate, strong redox ability, and efficient removal of Rhodamine B (RhB) at 83.01 %. Loading the Bi 2 O 2.33 /Bi 2 O 3 on lightweight carbon fibers allows for easy recycling. The Bi 2 O 2.33 /Bi 2 O 3 @ECNF demonstrates excellent stability and reusability, with a removal rate of 87.37 % for tetracycline hydrochloride (TCH) at high concentrations. This work presents a promising solution for the practical application of photocatalysts by overcoming the limitations of single photocatalysts and minimizing secondary pollution from single adsorbents.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
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2020
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IF 5.339
Shuo Wu,Yan Zhao,Xunxun Deng,Xinlan Yang,Xiuyun Wang,Yanqiu Zhao
This work demonstrates that the photoelectrochemical response of the CdS/Bi 2 O 2.33 direct Z-scheme heterojunction, synthesized by in situ deposition of CdS nanocrystals on the defect engineered Bi 2 O 2.33 , can be modulated by oxygen defect concentration. The appropriate oxygen defects not only increase the visible light absorption, provide active reaction sites to enhance PEC activity, but also promote the separation of carriers. The formation of CdS/Bi 2 O 2.33 direct Z-scheme heterojunction further improves these properties by extending the visible light absorption and promoting separation and transport of carriers, but avoids the usage of noble metal nanoparticles as electron transfer mediators, thus has a low cost and easy fabrication technology. The CdS/Bi 2 O 2.33 direct Z-scheme junction shows significantly improved photocurrent response as compared with those containing less oxygen defects, and is applied as a photoelectrochemical assay platform for Hg 2+ . The specific interaction between Hg 2+ and the S 2− in CdS significantly quenches the photocurrent response of the CdS/Bi 2 O 2.33 due to the formation of HgS. The photocurrent decrease is linear to the concentration of Hg 2+ in the range from 10 −11 to 10 −6 g/mL, with the limit of detection of 3.2 pg/mL. High accuracy and good reproducibility are realized in the real sample analysis of urine, river water, and sea water. The integration of oxygen defect engineering and direct Z-scheme electron transport principle provides a new avenue for fabricating high performance photoelectrochemical materials, which can be further combined with bio-recognition strategy for the ultrasensitive detection of biological molecules.
研究领域:
材料科学
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
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2023
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IF 7.3
R. Lu,S.-Z. Zhao,Y. Yang,Y. Wang,H.-L. Huang,Y.-D. Hu,R.D. Rodriguez,J.-J. Chen
TiO 2 nanotubes decorated with Bi 2 O 3 /Bi 2 O 2.33 nanosheets were prepared through a facile avenue that combines sacrifice template and hydrothermal methods . The TiO 2 nanotube structure provided a large specific surface area, and the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterojunction broadened the light absorption range by reducing the bandgap to 2.746 eV. The TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure demonstrated high adsorption capability for methyl orange (100 mg/L) with a 70% adsorption rate after 60 min. The photocatalytic performance of the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) heterostructure was evaluated through the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH). The removal rates of RhB (10 mg/L) and high concentration TCH (50 mg/L) could reach 93% and 96% after 60 min and 120 min of light irradiation, respectively. Theoretical calculations showed that the TiO 2 /(Bi 2 O 3 /Bi 2 O 2.33 ) structure enhanced photogenerated charge separation, leading to improved degradation of organic pollutants. This study provides a facile way for designing and creating heterostructural nanotubes with enhanced performance for removing organic pollutants.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Chuanyu Zhu,Lulu Zhang,Luyao Cui,Ziqiang Zhang,Rui Li,Yunfang Wang,Yawen Wang,Caimei Fan,Zhuobin Yu,Jianxin Liu
In the process of photocatalytic ammonia synthesis , efficient activation of nitrogen molecules constitutes a fundamental challenge. During the N 2 activation, the close interdependence between the acceptance and donation of electron results in their mutual limitation, leading to high energy barrier for N 2 activation and unsatisfactory photocatalytic performance. This work decoupled the electron acceptance and donation processes by constructing Fe-Bi dual active sites, resulting in enhancing N 2 activation through the high electron trapping ability of Fe 3+ and strong electron donating ability of Bi 2+ . The photocatalytic nitrogen reduction efficiency of 3%Fe/Bi 2 O 2.33 (118.71 μmol g cat −1 h −1 ) is 5.3 times that of Bi 2 O 2.33 (22.41 μmol g cat −1 h −1 ). In-situ Fourier transform infrared (In situ FTIR) spectroscopy and density functional theory (DFT) calculations manifest that Fe 3+ -Bi 2+ dual active sites work together to promote nitrogen adsorption and activation, and the reaction path is more inclined toward alternate hydrogenation path. N 2 adsorption and activation properties are optimized by heteronuclear bimetallic active sites, which offers a new way for the rational design of nitrogen-fixing photocatalysts .
研究领域:
材料科学
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催化
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光化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）