Nanoscale
·
2013
·Vol. 5
·期 20
·9764-9772
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IF 6.233
Dongfang Hou,Xianluo Hu,Pei Hu,Wei Zhang,Mingfei Zhang,Yunhui Huang
A novel p–n junction photocatalyst of Bi4Ti3O12 nanofibers–BiOI nanosheets has been fabricated through a simple and economical technique of electrospinning combined with a successive ionic layer adsorption and reaction (SILAR) process. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectra (DRS), and photoluminescence (PL) spectroscopy. The as-formed Bi4Ti3O12 nanofibers are composed of inter-linked nanoparticles of 50–80 nm in size. The thickness of the as-grown BiOI nanosheets is about 10 nm and the size of the BiOI nanosheets increases with the SILAR cycles. In particular, many {001} facets of BiOI nanosheets are exposed, which is favorable to enhance the visible-light photocatalytic activity. The p–n junction photocatalyst exhibits enhanced visible-light-driven photocatalytic activity for decomposition of rhodamine B (RhB) and phenol. The enhanced photocatalytic activity can be attributed to the extended absorption in the visible light region resulting from the BiOI nanosheets and the effective separation of photogenerated carriers driven by the photo-induced potential difference generated at the Bi4Ti3O12–BiOI p–n junction interface.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Jun Wang,Huangjingwei Li,Wanru Liao,Kang Liu,Hongmei Li,Ramadan A. Geioushy,Rafat Tahawy,Mahmoud Sayed,Liangxing Jiang,Junwei Fu,Min Liu
Substandard discharge of industrial wastewater leads to abundant silver ions (Ag + ) emission into water and soil, causing serious environmental threat. Precise and reliable detection of Ag + is vital for environmental surveillance, while it remains a great challenge in complex actual environment. Herein, a lab-to-factory adoptable photoelectrochemical (PEC) approach for highly selective and sensitive detection of Ag + in industrial wastewater has been first demonstrated. BiOI nanosheets (NSs) were prepared as photocathode and showed a spontaneous and selective ion-exchange process with Ag + ions when it immersed into complicated industrial wastewater. The in situ generated AgI/Ag exhibits unique localized surface plasmonic resonance (LSPR) effect to modulate PEC signals for highly selective and sensitive Ag + detection. As a result, the prepared photocathode delivers an ultralow detection limit (0.21 nM) and a broad linear range (up to 300 μM), outperforming most reported results. This work opens a feasible avenue for Ag + monitoring in actual environment.
研究领域:
环境科学
·
分析化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Haibo Li,Zujin Yang,Jingnan Zhang,Yongchao Huang,Hongbing Ji,Yexiang Tong
Semiconductor photocatalysis is a promising method to remove the harmful compounds into harmless molecules. Herein, In-doped BiOI (In-BiOI) photocatalysts with highly exposed dominant {001} facets were synthesized through a facile hydrothermal method. The XRD, SEM and TEM determinations revealed the high crystallinity structure of the samples, and the XPS results confirmed the doping of In. The In-BiOI nanosheets exhibited a higher activity in the photodegradation of p -chloroaniline (PCA) than that of pristine BiOI, among which the In-2 BiOI sample (feed mole ratio of In:Bi = 2%) possessed the best performance. Doping with In didn’t alter the structure, morphology, specific surface area or light absorption capacity of BiOI, but significantly improved its charge separation efficiency and transport capability, which were verified by the results of the lower PL emission, larger photocurrent intensity and smaller arc radius of EIS plots. More importantly, the mechanism of photocatalytic degradation is studied systematically, revealing that O 2− and h + were the major reactive species during the photodegradation process. Finally, the possible role of In-doping in enhancing the photocatalytic performance of BiOI is proposed.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·2048
·
IF 4.4
Shuo Yang,Wenhui Li,Kaiyue Li,Ping Huang,Yuquan Zhuo,Keyan Liu,Ziwen Yang,Donglai Han
Photocatalytic technology holds significant promise for sustainable development and environmental protection due to its ability to utilize renewable energy sources and degrade pollutants efficiently. In this study, BiOI nanosheets (NSs) were synthesized using a simple water bath method with varying amounts of mannitol and reaction temperatures to investigate their structural, morphological, photoelectronic, and photocatalytic properties. Notably, the introduction of mannitol played a critical role in inducing a transition in BiOI from an n-type to a p-type semiconductor, as evidenced by Mott–Schottky (M-S) and band structure analyses. This transformation enhanced the density of holes (h + ) as primary charge carriers and resulted in the most negative conduction band (CB) position (−0.822 V vs. NHE), which facilitated the generation of superoxide radicals (·O 2− ) and enhanced photocatalytic activity. Among the samples, the BiOI-0.25-60 NSs (synthesized with 0.25 g of mannitol at 60 °C) exhibited the highest performance, characterized by the largest specific surface area (24.46 m 2 /g), optimal band gap energy (2.28 eV), and efficient photogenerated charge separation. Photocatalytic experiments demonstrated that BiOI-0.25-60 NSs achieved superior methylene blue (MB) degradation efficiency of 96.5% under simulated sunlight, 1.14 times higher than BiOI-0-70 NSs. Additionally, BiOI-0.25-60 NSs effectively degraded tetracycline (TC), 2,4-dichlorophenol (2,4-D), and rhodamine B (Rh B). Key factors such as photocatalyst concentration, MB concentration, and solution pH were analyzed, and the BiOI-0.25-60 NSs demonstrated excellent recyclability, retaining over 94.3% of their activity after three cycles. Scavenger tests further identified ·O 2− and h + as the dominant active species driving the photocatalytic process. In this study, the pivotal role of mannitol in modulating the semiconductor characteristics of BiOI nanomaterials is underscored, particularly in promoting the n-type to p-type transition and enhancing photocatalytic efficiency. These findings provide a valuable strategy for designing high-performance p-type photocatalysts for environmental remediation applications.
研究领域:
材料科学
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环境科学
·
半导体物理
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Rui Ji,Zhuzhu Zhang,Lechen Tian,Liujun Jin,Qingfeng Xu,Jianmei Lu
A novel BiOI-incorporated NH 2 -UiO-66 composite photocatalyst, NH 2 -UiO-66@BiOI, was prepared using an in-situ successive ion-insertion method. The in situ grown BiOI nanosheets exhibited an ultrathin structure and were uniformly dispersed on NH 2 -UiO-66. The formation of tight heterojunctions, characteristics of enhanced visible light absorption and availability of abundant exposed active sites facilitated the efficient activation of peroxymonosulfate and the rapid degradation of Bisphenol A in water (12 min). Surprisingly, the photocatalyst maintained a fast degradation rate of Bisphenol A under the interference of different conditions. The research explored the charge transfer pathways and radical species between the heterojunction components, indicating that the heterojunction type of the NH 2 -UiO-66@BiOI was Z-scheme. In addition, the degraded intermediate components and high mineralization rate indicated that Bisphenol A was deeply degraded. In conclusion, this study synthesized metal–organic framework-based photocatalysts through a simple preparation method, which has potential application value in the rapid degradation of bisphenol A.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 10
·5966-5975
·
IF 3.094
Haocheng Yang,Jinjun Chen,Yong Zuo,Miao Zhang,Gang He,Zhaoqi Sun
In this study, TiO 2 nanorod arrays (TNR), Ag quantum dots (QDs) sensitized with TNR TiO 2 /Ag, bismuth oxyhalide (BiOI) nanosheets, and Ag QDs co-modified with TNR and TiO 2 /BiOI/Ag (TBA) were prepared by a stepwise process. The morphological, structural, compositional, optical, photocatalytic (PC), and photoelectrochemical (PEC) properties of the samples were investigated. The TBA-2 sample exhibited the highest photocurrent density (281.8 μA/cm 2 ) and photodegradation efficiency (93.3%), with values 9.7 times and 2.25 times higher than those for TNR, respectively. The improvement in sample performance can be attributed to the formation of a heterojunction between BiOI and TiO 2 , thereby enhancing the absorption of visible light and improving the charge separation efficiency; Ag QDs limit interfacial electron-hole pair recombination. The experimental results show that TBA can effectively promote light-induced carrier transport and visible light absorption, while inhibiting the recombination rate of the electron-hole pairs, PEC, and PC.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMISTRY
·
2017
·Vol. 35
·期 1
·30-34
·
IF 1.852
Ling Qian,Chongwu Wang,Aiping Chen,Huagui Yang
Bismuth vanadate (BiVO 4 ) has been identified as one of the excellent visible-light-responsive photoanode for use in the photoelectrochemical water splitting. Recently intense research efforts have been devoted to the development of highly efficient BiVO 4 photoanode. Herein, we reported a low-cost and scalable method for preparing nanostructured BiVO 4 film. A much enhanced photocurrent (1.5 mA•cm −2 ) was obtained for such film, which was 6.5 times higher than that of planar film at 1.23 V [vs. RHE (Reversible Hydrogen Electrode)]. The method provides an eco-friendly, reproducible and facile way to scale up on different substrates with attractive potential.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Xiaomin Yang,Xin Li,Lizhi Zhang,Jingming Gong
Triphenyl Phosphate (TPhP), as a typical model of organophosphorus flame retardants (OPFRs), has been regarded as emerging environmental contaminants of health concern. In this study, a rapid and highly sensitive visible-light-response PEC sensor has been developed for the detection of Triphenyl Phosphate (TPhP) using electrospun template directed molecularly imprinted nanofibers modified BiOI nanoflake arrays (BiOINFs) as a photoactive electrode. The molecularly imprinted electrospun nanofibers (labeled as MI-ESNFs) were carefully characterized by scanning electron microscopy (SEM), UV spectra , FTIR spectra measurements and various electrochemical techniques . Under the optimized experimental conditions, the photoelectrochemical response was linearly proportional to the logarithm value of TPhP concentrations in the range of 0.01 ng mL −1 to 500 ng mL −1 . Meanwhile, the sensor exhibited high selectivity and stability.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 23
·5123-5130
·
IF 7
Hong Wang,Mengmeng Gu,Menghua Yan,Xiuming Wu,Yuming Dong,Guang-Li Wang
Cathodic photoelectrochemistry, a research hotspot in state-of-art bioassays, is generally circumscribed by its monotonous signal transduction tactic of photoinduced electron transfer (PET) mechanism, which significantly narrows the scope of its applications. In this study, we reveal the surface oxygen vacancy (VO) formation elicited by the spontaneous coordination of catechol (CA) onto the surface of BiOI nanoplates for the innovative operation of the cathodic PEC signal transduction tactic. The in situ-generated VO functions as a carrier separation center to efficiently promote photocurrent generation. Taking tyrosinase (TYR) and Escherichia coli O157:H7 (E. coli O157:H7) as model targets, the established signal transduction tactic was validated as efficient and sensitive for the detection of the two targets with linear ranges from 1.0 × 10−4 to 1.0 U mL−1 and 5.0 to 1.0 × 106 CFU mL−1, respectively. Low-detection limits of 1.0 × 10−4 U mL−1 and 3.0 CFU mL−1 were achieved for TYR and E. coli O157:H7, respectively. This study opens up a new perspective of in situ generated surface VO on semiconductors, which underlies an innovative PEC signal transduction mechanism with convincing analytical performance. Hopefully, it might encourage more explorations of new methodologies for introducing surface vacancies with exquisite applications.
研究领域:
光电化学
·
生物分析
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分析化学
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纳米材料
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生物传感器
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 25
·2201276
·
IF 19.924
Peixian Lei,Huan Duan,Ling Qin,Xianhua Wei,Rui Tao,Zegao Wang,Feng Guo,Menglin Song,Wenjing Jie,Jianhua Hao
Artificial optoelectronic synapses with both electrical and light-induced synaptic behaviors have recently been studied for applications in neuromorphic computing and artificial vision systems. However, the combination of visual perception and high-performance information processing capabilities still faces challenges. In this work, the authors demonstrate a memristor based on 2D bismuth oxyiodide (BiOI) nanosheets that can exhibit bipolar resistive switching (RS) performance as well as electrical and light-induced synaptic plasticity eminently suitable for low-power optoelectronic synapses. The fabricated memristor exhibits high-performance RS behaviors with a high ON/OFF ratio up to 10 5 , an ultralow SET voltage of ≈0.05 V which is one order of magnitude lower than that of most reported memristors based on 2D materials, and low power consumption. Furthermore, the memristor demonstrates not only electrical voltage-driven long-term potentiation, depression plasticity, and paired-pulse facilitation, but also light-induced short- and long-term plasticity. Moreover, the photonic synapse can be used to simulate the “learning experience” behaviors of human brain. Consequently, not only the memristor based on BiOI nanosheets shows ultra-low SET voltage and low-power consumption, but also the optoelectronic synapse provides new material and strategy to construct low-power retina-like vision sensors with functions of perceiving and processing information.
研究领域:
神经形态电子学
·
光电子学
·
纳米材料
·
人工智能硬件
·
电阻开关器件
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DOI
高影响因子
危险品化学品经营许可证（带存储）