JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Kaiyue Gao,Chengming Zhang,Yi Zhang,Xiaoyu Zhou,Shuo Gu,Kehua Zhang,Xiufang Wang,Xiaojie Song
The conversion of N 2 to NH 3 is one of the most promising processes in maintaining natural life and chemical production. Photocatalytic nitrogen reduction reaction (NRR) has the advantage of clean and sustainable, which is considered to be an ideal synthesis technology. In this work, we report the successful synthesis of Bi 12 O 17 Br 2 ultrathin nanosheets through simple alkali treatment and solvothermal method . The Bi 12 O 17 Br 2 ultrathin nanosheets can improve the separation of carriers and the transfer of photogenerated electrons to N 2 molecules, thus improving the photocatalytic efficiency. Of note, the higher Bi/Br atomic ratio in Bi 12 O 17 Br 2 is beneficial to broaden the light absorption edge, and the high concentration of O atoms is easy to produce oxygen vacancies on the surface during the synthesis process of Bi 12 O 17 Br 2 . The abundant oxygen vacancies and high specific surface area enable N 2 molecules and water to have powerful chemical adsorption and activation. In addition, the photocatalytic reduction of N 2 to NH 3 in pure water shows excellent and stable performance, and the average generation rate of NH 3 reaches up to 620.5 μmol·L -1 ·h −1 . This study discovers that rich oxygen vacancies and ultrathin morphology may have a significant part in the process of the photocatalytic nitrogen reduction reaction.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Shikai Xue,Xin Li,Lin Li,Shan Huang,Jinhua Luo,Haiyan Wang,Qiujun Lu,Guoxing Yin,Fuyou Du
The photocatalytic process is a promising, cost-effective, and environmentally friendly method for remediating environmental pollution. Unfortunately, practical applications have been limited by the shortage of highly efficient photocatalysts. To overcome this problem, a unique cactus-like Bi 12 O 17 Br 2 /Bi 2 O 3 /Bi 25 FeO 40 (BBF) was synthesized facilely by hydrolyzing of rod-like MOF (CAU-17/MIL-100(Fe)) precursor, and the ratio of photocatalyst was adjusted by controlling the hydrolysis time. In this photocatalyst, Bi 12 O 17 Br 2 and Bi 25 FeO 40 were dispersed in Bi 2 O 3 , as well as Bi 12 O 17 Br 2 and Bi 2 O 3 were attached to an S-type heterojunction. The developed BBF demonstrated high photocatalytic efficiency and exceptional stability in degrading five bisphenol pollutants. The photocatalytic degradation of bisphenol A (BPA) using BBF could reach up to 98.7% within 60 min under visible light irradiation. Further characterization demonstrated a significant improvement in the photogenerated charge transfer efficiency and confirmed the S-scheme structure of BBF. Additionally, the possible degradation pathways and the evolution of intermediate toxicity of BPA were discussed according to the intermediates detected in the photocatalytic reaction process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Jianli Chen,Shuoshuo Zang,Kaiyue Gao,Chengming Zhang,Xiufang Wang,Hewen Liu
Herein, a novel ultrathin 2D/2D heterostructure, Bi 12 O 17 Br 2 with oxygen vacancies/ZnCr layered double hydroxides (V o -Bi 12 O 17 Br 2 /ZnCr-LDHs, V o -BZ) is prepared by solvothermal and coprecipitation methods for photocatalytic reduction of N 2 to NH 3 . The optimal 2D/2D V o -BZ heterostructure photocatalyst shows production rate of ammonia production of 286.0 μmol·g −1 ·h −1 . It is 12.5 and 3.6 times higher than that of pure ZnCr-LDHs and V o -Bi 12 O 17 Br 2 . The improved photocatalytic nitrogen reduction performance is attributed to the intimate contact interface, matching bandgap structure, the shortened migration distance, and thus significantly improved separation and transfer efficiency of hole-electron pairs and light adsorption ability. The large number of oxygen vacancies and high specific surface promote the absorption, activation and deionization of N 2 molecules. The theoretical simulation calculation indicates that the free energy of nitrogen molecules on the surface of Vo-BZ is favorable for the absorption and activation of N 2 molecules. The existence of oxygen vacancies and formation of heterojunctions can dramatically reduce energy barrier of nitrogen molecule hydrogenation process to boost photocatalytic N 2 reduction. This study provides a new idea for the development of efficient photocatalytic nitrogen fixing catalysts.
研究领域:
材料科学
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环境科学
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催化化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Kunfeng Zhang,Jinxia Liang,Sainan Yang,Fangfei Song,Hongxia Chen,Baozhong Zhang,Bo Peng,Hanyu Chen,Hongxing Dai
Constructing an S-scheme heterojunction presents an effective strategy to enhance photocatalytic efficiency via accelerating photoexcited charge separation while preserving strong redox potentials. Herein, amorphous Ni(OH) 2 (a-NH) was in-situ integrated with crystalline Bi 12 O 17 Br 2 (BOB) nanosheets to form an amorphous/crystalline a-NH/BOB S-scheme heterojunction. The as-synthesized a-NH/BOB-0.5 photocatalyst exhibited superior bisphenol A (BPA) degradation efficiency, achieving 48.7 and 3.7-fold enhancements compared to individual a-NH and BOB, respectively. Comprehensive investigations revealed that the improved photocatalytic activity originated from the synergistic effects of enhanced light-harvesting ability and the formation of strong interfacial electric field at the amorphous/crystalline interface. Moreover, the influences of solution pH, coexisting anions, and water matrices on BPA degradation efficiency were also investigated. Reaction mechanism and toxicity assessment demonstrated that BPA could be gradually transformed into small molecules with low toxicity. This work demonstrates an efficient approach for the design of high-performance photocatalysts for environmental remediation by constructing amorphous/crystalline interface and S-scheme charge transfer mechanism.
研究领域:
环境科学
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材料科学
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催化
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）