Journal of Biomedical Research
·
2018
·
IF 0
Mei-qing Sun,Zhan-lin Ding,Hong Wang,Guang-ping Yu,Li,Ming-chun Li,Meng-meng Zhen
BiOBr nanosheets are important photocatalytic nanomaterials. However, their biological effects remain to be explored. In this study, we investigated the antifungal effect of BiOBr nanosheets on Candida albicans . Strikingly, the nanosheets strongly inhibited the growth of C. albicans [IC 50 =(96±4.7) mg/L], hyphal development and biofilm formation. Compareed to the antifungal effect of the cationic surfactant cetyltrimethylammonium bromide, the inhibitory effect of the nanosheets on fungal pathogen was attributed to cetyltrimethylammonium bromide adsorbed by the nanosheets. Thermal gravity analysis and cetyltrimethylammonium bromide release experiment indicated that only 0.42% cetyltrimethylammonium bromide on BiOBr nanosheets was released. Taken together, this study uncovers the contribution of surfactant released from the nanosheets to their antifungal activity.
研究领域:
微生物学
·
纳米医学
·
药物递送
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DOI
PubMed
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Huiming Shi,Quanquan Shi,Xinrui Gu,Binli Wang,Brock Lumbers,Gao Li
The highly efficient photo-oxidation of alcohols has sparked significant potential to cope with environmental pollution and the ever-increasing energy crisis. This study reports a unique Ti 3 C 2 /BiOBr (TB) heterojunction with a rich inter-face based on in situ exfoliation of MXene and subsequently anchored onto BiOBr sheets. The TB nano-composites exhibited substantially improved photo-catalytic activity towards the photo-oxidation of benzyl alcohol (BA) to benzaldehyde and achieved a formation rate of 1.73 mmol g −1 h −1 , greater than pristine BiOBr. The ultra-thin inter-facial contact boosted the oxygen vacancies (O v ) and Ti 3+ and possessed the most negative adsorption energy, which boosted the transfer and separation of inter-facial charge carriers and the adsorption and dissociation of BA. Overall, the successful synthesis of TB composite, along with its exceptional photo-catalytic performance, offers valuable insights for applications in green chemistry and environmental remediation.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Chu-Ya Wang,Qi Zeng,Guangcan Zhu
Bisphenol A (BPA), a typical endocrine disrupting chemical, is widespread in aqueous environment and cannot be efficiently treated by traditional water treatment technologies . Bismuth oxybromide (BiOBr) is a promising photocatalyst with a special layered structure. However, its band gap (2.8 eV) is not narrow enough for the efficient harvesting of visible light, severely restricting its practical use. Given that the band gap of Bi 2 S 3 is only 1.3 eV, S-doping modification could be used to tailor the band structure of BiOBr. Here, series of S-doped BiOBr nanosheets was prepared through a facile hydrothermal procedure. The as-prepared S 0.2 -BiOBr nanosheets showed a narrower band gap of 2.33 eV. The intrinsic photocatalytic activity of S 0.2 -BiOBr sample for the degradation of BPA was 2.78 times higher than that of BiOBr under visible light degradation. Moreover, the mechanism of BPA degradation over the S-doped BiOBr under visible light irradiation was elucidated based on the experimental results and density functional theoretical calculations. Overall, a feasible and effective doping method was proposed to improve the utilization efficiency of visible light.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Miao Hu,Aihua Yan,Xinyang Wang,Fei Huang,Qiaopeng Cui,Fan Li,Ji Huang
Ce-doped bismuth oxybromide (BiOBr) nanoplates were successfully synthesized by a facile hydrothermal method. The phase, composition, chemical state, microstructures, spectrum response, band gap, electron transfer and photocatalytic activity were analyzed in detail by a series of advanced tools. The results indicated that Ce 3+ ions were successfully incorporated into the crystal lattice of BiOBr. With the increase of Ce-doped amounts, the morphology gradually changed from nanowalls to nanoplates. Moreover, introducing Ce 3+ ions into BiOBr crystal not only slightly blue-shifed the adsorption edge, but also slightly widened the band gap. Compared to pure BiOBr, Ce-doped samples exhibited enhanced photocatalytic activity towards Rhodamine B (RhB) degradation under visible-light irradiation. The enhanced performance may result from higher specific surface area, faster charge transfer and lower carrier recombination. This works further reveal the mechanism of enhanced photocatalytic activity about rare-earth doped photocatalysts.
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
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Chun Sun,Yelin Ding,Yiwei Zhao,Zhihui Deng,Kai Lian,Zhengtong Wang,Jiazhi Cui,Ruifeng Wang,Jiabao Bai
BiOBr has garnered significant attention for photocatalysis owing to its distinctive layered structure. Nevertheless, it is full of challenges to synthesize high-quality BiOBr nanosheets by a simple room-temperature strategy due to the rapid chemical reaction between (Bi 2 O 2 ) 2+ cations and Br - anions. Herein, a Cs 3 Bi 2 Br 9 conversion strategy is proposed to fabricate BiOBr nanosheets with highly exposed (001) facets. BiOBr nanoclusters can grow on the surface of Cs 3 Bi 2 Br 9 during the hydrolysis process, which can prevent further corrosion of Cs 3 Bi 2 Br 9 , resulting in a sluggish BiOBr formation rate. During the conversion process, atom rearrangement occurs, leading to the creation of abundant oxygen vacancies. Furthermore, through precise adjustment of the amount of Cs, we can finely modulate the width and thickness of BiOBr nanosheets. As a result, the optimal sample achieves complete photodegradation of rhodamine B under 12.5 min of light irradiation. Utilizing this facile and convenient preparation method, an ohmic heterojunction comprising MXene and BiOBr has been synthesized, effectively promoting the separation of photogenerated carriers. Excitingly, the fabricated BiOBr/MXene exhibits higher photocatalytic efficiency than the single BiOBr, which can degrade rhodamine B within 7.5 min.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2025
·
IF 6.3
Rong Wang,Weikun Zhu,Jiayi Hu,Siyang Liao,Cheng Chen,Baihang Chen,Shaobin Huang,Jiangyao Chen
Bismuth-based photocatalyst has garnered significant attention for degrading dyes and antibiotics in wastewater. However, their photocatalytic performance remains limited due to the high recombination rate of photoinduced carriers. Constructing a bismuth-based photocatalyst with high-efficiency and rapid degradation performance is crucial for its practical application. In this study, BiOBr nanosheets, with an ultra-thin structure and abundant (001) facet exposure, exhibiting stable photoelectric conversion ability, were successfully synthesized through a simply solvothermal method. Under simulated solar light irradiation, the catalyst achieved 100 % degradation of rhodamine B within 5 min and 97.6 % degradation of tetracycline within 30 min, while over 90 % degradation efficiency after 5 cycles was preserved, demonstrating high, rapid and stable performance of the catalyst. Moreover, 90.7 % and 44.5 % of removal and mineralization efficiencies for TC within 30 min were observed under natural sunlight irradiation. Superoxide radicals and photo-generated holes were the primary species responsible for the degradation of pollutants and the former contributed more effect in long reaction time. Finally, a possible photocatalytic oxidation pathway of tetracycline was proposed based on identified five main intermediates. The BiOBr nanosheets catalyst exhibits great potential for industrial applications in the elimination of hazardous and difficult-to-degrade organic pollutants in wastewater.
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
Catalysis Science & Technology
·
2018
·Vol. 8
·期 10
·2588-2597
·
IF 5.365
Yuwei Mi,Haiping Li,Yongfang Zhang,Na Du,Wanguo Hou
Crystal facet engineering is one of the most important ways to enhance the photoactivity of photocatalysts, but it remains challenging so far. In addition, the effects of exposed facets and crystallite sizes on the photoactivity of BiOX (X = Cl, Br, or I) nanosheets have been widely investigated. However, it is still unclear which one between the exposed facets and the crystallite sizes is more important for the photoactivity of the BiOX nanosheets. In this work, a series of BiOBr nanosheets with tunable exposed facets and crystallite sizes were solvothermally synthesized in a mixed solvent of n-propanol, water, and acetic acid. The regulation of the exposed facets and crystallite sizes was achieved simply by changing the n-propanol/water volume ratios (Rp/w, 0/30 to 30/0) of the mixed solvent. At low n-propanol contents (Rp/w < 15/15), the obtained BiOBr nanosheets expose dominantly (001) facets, while at high n-propanol contents (Rp/w > 20/10), they expose dominantly (010) facets. With increasing Rp/w, the lateral size and thickness of the BiOBr nanosheets all decrease, from 1700 to 174 nm and from 156 to 17 nm, respectively. The effects of exposed facets and thicknesses of BiOBr nanosheets on the photocatalytic activity, evaluated by degradation of salicylic acid and rhodamine B under visible-light irradiation, were investigated. The exposed facet and thickness of BiOBr nanosheets are both important for their photocatalytic performance. The (001) facets exhibit a higher photocatalytic activity than the (010) facets. For the BiOBr nanosheets with the same (001) or (010) exposed facets, the photocatalytic activity increases with a decrease in their thickness. This study provides a new facile way to adjust the exposed facets and crystallite sizes of BiOX, and the findings may provide guidance for crystal facet engineering of other photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Zhijie Zhang,Liang Li,Ying Jiang,Jiayue Xu
Heterojunction manipulation has been deemed as a promising approach in exploring efficient photocatalysts for CO2 reduction. In this article, a novel step-scheme (S-scheme) photocatalyst of CsPbBr3 quantum dots/BiOBr nanosheets (CPB/BiOBr) was fabricated via a facile self-assembly process. The strong interaction, staggered energy band alignments, and much different Fermi levels between CsPbBr3 and BiOBr promised the formation of an S-scheme heterojunction. The resultant CPB/BiOBr heterojunction delivered remarkable photocatalytic performance in CO2 reduction, with an electron consumption rate of 72.3 μmol g–1 h–1, which was 4.1 and 5.7 times that of single CsPbBr3 and BiOBr, respectively. The superior photocatalytic performance originated from the impactful spatial separation of photoinduced electron–hole pairs, as well as the preservation of strongly reductive electrons for CO2 reduction. This work offers a rational strategy to design S-scheme heterojunctions based on lead halide perovskites, which are expected to have potential applications in the field of photocatalysis and solar energy utilization.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 13
·3185
·
IF 4.2
Li Lin,Si Xiao,Chuxuan Wang,Manhong Huang,Ling Xu,Yi Huang
The development of superlyophobic materials in liquid systems, enabling synchronous oil/water separation and dye removal from water, is highly desirable. In this study, we employed a novel superwetting array-like BiOBr nanosheets anchored on waste rock wool (RW) fibers through a simple neutralization alcoholysis method. The resulting BiOBr/RW fibers exhibited superoleophilic and superhydrophilic properties in air but demonstrated underwater superoleophobic and underoil superhydrophobic characteristics. Utilizing its dual superlyophobicity, the fiber layer demonstrated high separation efficiencies and flux velocity for oil/water mixtures by prewetting under a gravity-driven mechanism. Additionally, the novel BiOBr/RW fibers also exhibited excellent dual superlyophobicity and effective separation for immiscible oil/oil systems. Furthermore, the BiOBr/RW fibers could serve as a filter to continuously separate oil/water mixtures with high flux velocity and removal rates (>93.9%) for water-soluble dye rhodamine B (RhB) simultaneously by directly activating peroxymonosulfate (PMS) in cyclic experiments. More importantly, the mechanism of simultaneous oil/water separation and RhB degradation was proposed based on the reactive oxygen species (ROS) quenching experiments and electron paramagnetic resonance (EPR) analysis. Considering the simple modified process and the waste RW as raw material, this work may open up innovative, economical, and environmentally friendly avenues for the effective treatment of wastewater contaminated with oil and water-soluble pollutants.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Mingming Li,Yue Gong,Jiaqiang Wen,Zhengda Li,Yanjie Wang,Tao He
The development of advanced photoactive materials has aroused widespread interest, but is severely plagued by the inherent narrow photo-responsive range and rapid recombination of electrons and holes. In this study, the unconventional BiOBr nanosheets decorated with Bi 0 and oxygen vacancies (OVs) are successfully synthesized through a facial one-pot hydrothermal method, followed by heat treatment. Cetyltrimethylammonium bromide and mannitol contribute to the selective exposure of (001) and (010) facets, respectively. The absence of the outermost Br atoms facilitates the simultaneous generation of OVs and Bi 0 on the surface during heating, forming the Schottky junction. The synergy of SPR in the Bi 0 metal, OVs and Schottky junction can effectively enhance the light absorption and charge separation. This work proposes and verifies a feasible approach to construct defects in-situ by regulating the crystal facets and manipulating the surface atomic arrangement and coordination.
研究领域:
材料科学
·
光化学
·
纳米技术
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 1
·297-306
·
IF 9.9
Xie Jing,Lu Zhenjiang,Feng Yue,Huang Jianguo,Hu Jindou,Hao Aize,Cao Yali
Defect modulation currently plays a decisive role in addressing the poor photoabsorption, sluggish electron hole separation, and high CO 2 activation barrier in photocatalytic CO 2 reduction. However, hunting for a straightforward strategy to balance the concentration of oxygen vacancy and metal cation defect in one photocatalyst is still a great challenge. Herein, a bismuth vacancies BiOBr nanosheets (BiOBr-1) on the exposed [001] facets were constructed via an acetic acid molecule modification strategy, which can repair oxygen defect by bismuth vacancy in low-temperature solid-state chemical method. Benefiting from the formed bismuth defects that can not only broaden light absorption and elevate charge separation efficiency, but also enhance adsorption and activation of CO 2 molecules, the evolution rates of photocatalytic CO 2 conversion into CO (71.23 µmol·g −1 ·h −1 ) and CH 4 (8.90 µmol·g −1 ·h −1 ) attained by BiOBr-1 are superior 7.1 and 11 times to that of plate-like BiOBr. The photocatalytic mechanisms including adsorption concentration and activation process of CO 2 are further revealed by the in situ diffuse reflectance infrared flourier transform spectra (DRIFTS). This finding of the existence of distinct defects in ultrathin nanosheets undoubtedly leads to new possibilities for photocatalyst design using two-dimensional materials with high solar-driven photocatalytic activity.
研究领域:
材料科学
·
环境科学
·
纳米技术
·
催化
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 4
·1-16
·
IF 2.8
Wu Sheng,Wang Tingting,Li Yingwei
A novel 3D octahedral BiOBr/UiO-66 heterostructure photocatalyst was synthesized through the in-situ growth of BiOBr nanosheets on octahedral UiO-66 at ambient temperature. This heterojunction of type II exhibits a substantial specific surface area, promoting intimate interfacial contact which favors carrier transmission and enhances the contact area of the semiconductor surface reaction. The morphology and structure of the catalyst were characterized via SEM and TEM. Transient photocurrent and electrochemical impedance spectroscopy confirm the advantageous nature of the heterojunction for carrier separation. Further investigation delves into the photocatalytic degradation of RhB. After 70 min of light irradiation, the removal rate of RhB reached a remarkable 94.9% using the 60% BiOBr/UiO-66 composition. Furthermore, the apparent kinetic constant of the 60% BiOBr/UiO-66 was measured to be 0.03522 min −1 , surpassing pure BiOBr (0.01238 min −1 ) by a factor of 2.9 and UiO-66 (0.00035 min-1) by a factor of 100. Experiments involving free radical capture provide evidence that superoxide radicals (·O 2− ), electrons(e − ) and holes (h + ) are the principal active species during the photodegradation process. Accordingly, a proposed photocatalytic mechanism for the BiOBr/UiO-66 heterojunction emerges.
研究领域:
材料科学
·
纳米技术
·
环境科学
·
光催化
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）