APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Kun Wang,Shen Yu,Peng Jiang,Wenrui Liu,Man-Man Yuan,Wangyu Tong,Lihua Chen,Zhao Deng,Baolian Su
CO 2 reduction by a sustainable pathway such as photothermal catalysis is highly demanded currently, high carrier recombination rate still severely limits the performance of photothermal catalysis. Constructing heterojunction interfaces with high exposed area is an effective strategy to solve the problem of carrier recombination. However, fine control of the interface structure is still highly challenging. Herein, Density functional theory (DFT) calculations were constructed to reveal that metallic Bi leads to more densities of states (DOS) generation at the conduction band edge in Bi-BiOBr, which argues that photogenerated electrons are more likely to be delivered to metallic Bi. A TiO 2 @Bi-BiOBr hollow hierarchical core–shell heterojunction was designed, providing a highly exposed interface and Bi between interfaces. Such structure endows the catalyst with excellent photothermal catalytic performance, achieving a CO yield of 30.4 μmol·h −1 ·g −1 . The highly improved performance is attributed to interfacial thermoelectrons transfer boosted by the construction of TiO 2 @BiOBr heterojunction as well as metal Bi. And a possible CO 2 reduction pathway is proposed, which is consistent with the Carbine pathway. This study provides an exciting idea for the modulation of photoelectron transfer at catalyst interfaces.
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
OPTICAL MATERIALS
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2022
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IF 3.754
Jinfen Niu,Kai Wang,Lan Yang,Jiahui Shi,Yue Zhang,Fan Yang,Xiaojiao Yu,Binghua Yao
Photocatalysis can be a potential technique for decomposing antibiotics contaminants from water. In this study, g-C 3 N 4 modified Bi/BiOBr nanosphere were prepared by a simple microwave solvothermal method, and the structure-properties relationships of the Z-scheme heterojunction were evaluated in degrading organic dyes. Various characterization techniques were then applied to elucidate the structure-performance relationships of the resulting heterojunction photocatalysts in degrading CIP. Compared with pristine g-C 3 N 4 or Bi/BiOBr, the g-C 3 N 4 @Bi/BiOBr nanocomposites showed heightened property in photocatalytic degradation of CIP. The photocatalytic efficiency of CIP decomposition over the Z-scheme of g-C 3 N 4 @Bi/BiOBr heterojunction was about 2.38 and 1.35 times homologous to those of original g-C 3 N 4 and Bi/BiOBr. The enhancement in photocatalytic activity of g-C 3 N 4 @Bi/BiOBr could be described by the Z-scheme pathway and the SPR effect of Bi 0 , which broadened visible light absorption and promoted the separation of photoinduced carriers. In addition, the effect of typical water matrix factors, such as pH, anionic, and cationic on photodegradation rate were evaluated. Furthermore, results of scavenging experiments showed that ·OH, ·O 2 − , and h + all participate in the degradation of CIP. Based on the band structure and scavenging measurements, a possible photocatalytic mechanism for the as-synthesized g-C 3 N 4 @Bi/BiOBr composites was proposed.
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
SOLID STATE SCIENCES
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2022
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IF 3.752
Peijie Weng,Qing Cai,Linfeng Zhang,Huadong Wu,Kun Wu,Jia Guo
In this study, the Mo -doped hollow hierarchical Bi/BiOBr microspheres are prepared by the solvothermal method with the Sn 2+ as reductant. The prepared composites show a good degradation effect for ciprofloxacin (CIP) under visible light. Especially, the BSM-22 composite show the best photocatalytic activity, with the apparent rate constant k as high as 0.03014 min −1 , which is 26.9 times that of the pure BiOBr. It is assumed that the introduction of Sn 2+ facilitate the formation of hollow hierarchical microspheres structure of BiOBr microspheres and the appearance of metallic Bi on the surfaces. Therefore, the transfer and separation efficiency of photogenerated charges is increased in the composites. Impressive, benefit from the microtopography of the hollow structure, the specific surface area of the BSM-22 (53.476 m 2 /g) is 21.76 times than that of the BiOBr (2.458 m 2 /g). The doping of Mo reduces the band gap of BiOBr (exactly from 2.61 to 1.96 eV) and broaden the photoabsorption region. Therefore, the photocatalytic activity of the Mo -doped Bi/BiOBr microspheres are heavily improved in dealing with different kinds of antibiotic molecules. More importantly, these results show that the design strategies of heteroatom doping, metal bismuth production, and morphology control of the bismuth oxybromide composite can greatly improve the visible-light catalytic activity.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2015
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IF 3.091
Meichao Gao,Dafeng Zhang,Xipeng Pu,Hong Li,Dongdong Lv,Bingbing Zhang,Xin Shao
Bi/BiOBr photocatalysts with improved photodegradation performances were synthesized by a facile one-step hydrothermal method using ethanol–water mixed solution. The samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, UV–vis diffuse reflectance spectroscopy and photoluminescence spectroscopy. The addition of ethanol results in the partial reduction of Bi 3+ ions to metallic Bi, different morphology from pure BiOBr , and the formation of oxygen vacancies. The dosage of ethanol plays a vital role in the morphologies and photodegradation performances of as-obtained Bi/BiOBr. The Bi/BiOBr photocatalysts show improved photodegradation performances, which is attributed to the high surface area, narrow band gap, and inhibited recombination of electron–hole pairs .
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
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2021
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IF 2.986
Chunbei Wu,Chuxin Zhou,Yuanyuan Chen,Zhigang Peng,Jun Yang,Yuanming Zhang
A Bi-BiOBr/BiPO4 heterojunction structure was successfully synthesized via a two-step solvothermal method with ethylene glycol as a reducer. Little BiPO4 irregular polyhedrons and little metal Bi spherical nanoparticles were uniformly dispersed on the surface of BiOBr nanosheets with intimate contact and formed a heterojunction structure between BiPO4 and BiOBr. It was found that Bi-BiOBr/BiPO4 had a significant improvement in photocatalytic performance for RhB degradation compared to bare BiOBr and BiPO4. The photocatalytic degradation rate constant of 0.2-Bi/BiOBr/BiPO4 was 1.44 h-1, which was 3.8 times and 14.2 times more than that of bare BiOBr and BiPO4, respectively. This is attributed to the formation of a ternary heterojunction, which benefits the separation of photogenerated electron-hole pairs. Furthermore, with the introduction of metal Bi, the SPR effect of metal Bi can effectively improve the absorption ability of Bi-BiOBr/BiPO4 photocatalyst, resulting in enhanced photoactivity. In this work, the mechanism of photocatalytic degradation was studied by using the photochemical technique and the capture experiment of active species, and it was revealed that h+ and ⋅O2- played a major role in the photocatalytic 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
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Dafeng Zhang,Hao Liu,Changhua Su,Hong Li,Yanling Geng
Bi/BiOBr composites with oxygen vacancies were synthesized by a simple combustion method. The as-synthesized catalysts were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, UV–Vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy. Along with the formation of BiOBr, the reduction of partial Bi 3+ cations was achieved, and thus Bi/BiOBr composites were one-pot obtained. Moreover, the formation of oxygen vacancies was confirmed. Compared with pure BiOBr, Bi/BiOBr composites exhibit significantly improved photodegradation performances under visible light irradiation, which can be attributed to the surface plasma resonance effect, electron sink effect of metallic Bi nanoparticles, and the narrowed band gap caused by the formed oxygen vacancies. Moreover, the main active species and photocatalytic mechanism of Bi/BiOBr under visible light irradiation were discussed in detail.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Qian Wang,Huanshun Yin,Jia Ding,Yunlei Zhou,Shiyun Ai
5-Formyluracil (5fU) is considered an important epigenetic modification agent involved in gene regulation, cell differentiation, and development. 5fU exists in many cells and tissues but is highly similar to the structure of 5-formylcytosine (5fC) and is less abundant in genome. Therefore, the development of a rapid, sensitive, and highly selective method to detect 5fU is desired. In this study, a photoelectrochemical biosensor based on WS2/Bi/BiOBr nanocomposites, black TiO2 (b-TiO2), and hemin/G-quadruplex was described, which was found to be highly sensitive and selective for 5-formyluracil-2′-deoxyuridine-5′-triphosphate (5fdUTP) detection. WS2/Bi/BiOBr was first employed as a photosensitive material, and 3,4-diaminobenzoic acid (DABA) was adopted as a 5fdUTP recognition and capture reagent, where DABA was captured by polyethylene polyamine through covalent reaction to form a stable amid bond. Then, a benzimidazole bond was formed between DABA and −CHO of 5fdUTP, and 5fdUTP was selectively captured on the electrode. Using b-TiO2 as a cross-linker, a guanine-rich ssDNA sequence was further immobilized on the electrode surface by covalent reaction with the 5fdUTP phosphate group. With the assistance of K+ and hemin, the hemin/G-quadruplex structure was formed on the electrode. The hemin molecules in the structure of hemin/G-quadruplex obviously enhanced the PEC response of the biosensor for detecting 5fdUTP, with a linear range of 0.005–500 nM and a detection limit of 1.53 pM (S/N = 3). In addition, this method exhibits optimistic selectivity. The precision and accuracy of this method were evaluated by studying the content of 5fdUTP in genome DNA of crop tissues with standard addition recovery experiments.
研究领域:
生物化学
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分析化学
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分子生物学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
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2023
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IF 6.2
Suo Wang,Huanshun Yin,Jia Ding,Haodong Chen,Lingsong Wang,Yunlei Zhou,Kexue Liu,Jun Wang
Bi/BiOBr/Bi 2 O 2 CO 3 heterojunction was synthesized by one-pot hydrothermal method using DMF as carbon source for Bi 2 O 2 CO 3 and reducing agent for Bi 3+ , NaBr as bromine source and Bi(NO 3 ) 3 as bismuth source. The photocatalytic properties were evaluated with photodegradation of rhodamine B, tetracycline and oxytetracycline under visible light with the degradation efficiency of 99.83% ( k = 0.5843 min −1 , 9 min), 81.75% ( k = 0.0247 min −1 , 60 min) and 70.23% ( k = 0.0225 min −1 , 60 min), respectively. The enhanced photoactivity is ascribed to the increased separation efficiency of photogenerated electron-hole pair and improved electron migration rate, causing by strong visible-light adsorption, surface plasmon resonance of Bi nanoparticles and the matched energy band between BiOBr and Bi 2 O 2 CO 3 . In addition, as nitrogen-containing organic pollutants of rhodamine B, tetracycline and oxytetracycline, N element was proved to form ammonium under photocatalysis with indoxyl blue method. More importantly, this work also evaluated the ecotoxicological effects of pollutant, indicating the decreased ecotoxicological effects of pollutant after degradation.
研究领域:
环境科学
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材料科学
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化学工程
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毒理学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Hualin Jiang,Qi Wang,Pinghua Chen,Huitao Zheng,Jinwen Shi,Hongying Shu,Yanbiao Liu
The development of advanced and robust photocatalysts is vital for efficient photocatalytic degradation of the antibiotic tetracycline . Herein, a hierarchical heterojunction (Bi)BiOBr/rGO was facilely synthesized by employing an in-situ reduction strategy. An obvious synergistic effect between adsorption and photocatalysis was observed. A >98% tetracycline degradation efficiency was obtained within 20 min, and high performance could be maintained for over 50 h in a continuous operation without any post-treatment. The experimental and DFT calculation results suggested that there existed a built-in electric field between the interfaces, leading to the fast electron migration. Furthermore, rGO could significantly enhance the tetracycline adsorption, and Bi largely suppressed the charge carrier recombination owing to the surface plasmon resonance (SPR) effect. A possible tetracycline degradation pathway was proposed based on the HPLC-MS analysis. This study provides pathways for the rational design of advanced and robust photocatalysts to effectively degrade emerging contaminants in practical continuous-flow configurations.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Ziyan Liu,Junrong Chen,Yuanlan Wang,Wenqing Zhang,Wenlei Wang,Jing Wang
The photocatalytic reduction of CO 2 to CO is often constrained by suboptimal visible-light harvesting, interfacial recombination losses, and durability under repeated cycling. Here we design a Bi–BiOBr@CNF architecture that integrates metallic Bi (for plasmon-assisted excitation and interfacial electron transfer), oxygen/bromine vacancies (for CO 2 adsorption/activation), and a conductive CNF network (for dispersion and transport). Photoelectrochemical characterizations elucidate the synergistic mechanism. Under visible light, the catalyst delivers CO as the single detectable product with high selectivity; cycling tests reveal performance decay that is mechanistically linked to defect evolution, and a moderate-temperature regeneration restores activity. The results elucidate the respective roles of Bi 0 , O V , Br V , and the CNF scaffold within an integrated mechanistic framework, and indicate a viable strategy for durable photocatalytic reduction of CO 2 to CO.
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Dayu Li,Longfei Li,Wenchao Zhang,Chao Zhang
Construction of heterojunction can inhibit the recombination of electron holes and improve the sunlight absorption, thus improving the photocatalytic performance of semiconductors. In this research, Bi@BiOBr/ZnO coatings are in-situ grown on nickel foam by a facile hydrothermal method . Before coating deposition the nickel foam surface is modified under different radiofrequency plasma atmospheres (O2, H2/Ar, Ar, CH4) in pulsed mode. The plasma treating effects on the coating morphology, crystallization, chemical and photocatalytic properties are investigated. It is found that various morphologies of Bi@BiOBr/ZnO coatings have been grown on the plasma-treated nickel foam surface by using the different plasma atmospheres. The polycrystalline structure including Bi, BiOBr and ZnO phases has been identified for the different coatings. The photocatalytic mechanism includes the SPR effect of metal Bi which can inhibit the recombination of electron holes and heterojunction structure of BiOBr–ZnO has good effects on the photodegradation performance of MO solution under visible light .
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2021
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IF 5.565
Yongjin Li,Yingying Zhang,Jiajing Wang,Youzhun Fan,Taizhong Xiao,Zhaoyi Yin,Tianhui Wang,Jianbei Qiu,Zhiguo Song
For better use of solar energy, the development of efficient broadband photocatalyst has attracted extraordinary attention. In this study, a ternary composite consisting of Sr 2 LaF 7 :Yb 3+ ,Er 3+ upconversion (UC) nanocrystals and Bi nanoparticles loaded BiOBr nanosheets with oxygen vacancies (OVs, SLFBB) was designed and synthesized by multistep solvent-thermal method. Mechanisms of in-situ formation of Bi nanoparticles and OVs in BiOBr/Sr 2 LaF 7 :Yb 3+ ,Er 3+ composites (SFLB) are clarified. The Bi metal and OVs enhanced the light-harvesting capacity in the region of visible-near-infrared (Vis-NIR), and promoted the separation of electron–hole (e − /h + ) pairs. Furthermore, the surface plasmon resonance (SPR) effect of Bi metal can improve the energy transfer from Sr 2 LaF 7 :Yb 3+ ,Er 3+ to BiOBr via nonradiative energy transfer process, resulting in enhancing the light utilization from upconverting NIR into Vis light. Due to the synergistic effects of UC function, SPR and OVs, the SFLBB exhibited obviously enhanced photocatalytic ability for the degradation of BPA with a rate of 8.9 × 10 −3 min −1 , which is about 2.78 times higher than 3.2 × 10 −3 min −1 of BiOBr (BOB) under UV–Vis-NIR light irradiation. This work provides a novel strategy for the project of high-efficiency Bismuth-based broadband photocatalysts, which is helpful to further understand the mechanism of enhanced photocatalysis by UC function and plasmonic effect.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）