Journal of Environmental Sciences
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2023
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IF 6.9
Yi Yuan,Wen-Long Wang,Zhi-Wei Wang,Jin Wang,Qian-Yuan Wu
Carbon nitride has been extensively used as a visible-light photocatalyst, but it has the disadvantages of a low specific surface area, rapid electron–hole recombination, and relatively low light absorbance. In this study, single-atom Ag was successfully anchored on ultrathin carbon nitride (UTCN) via thermal polymerization, the catalyst obtained is called AgUTCN. The Ag hardly changed the carbon nitride's layered and porous physical structure. AgUTCN exhibited efficient visible-light photocatalytic performances in the degradation of various recalcitrant pollutants, eliminations of 85% were achieved by visible-light irradiation for 1 hr. Doping with Ag improved the photocatalytic performance of UTCN by narrowing the forbidden band gap from 2.49 to 2.36 eV and suppressing electron–hole pair recombination. In addition, Ag doping facilitated O 2 adsorption on UTCN by decreasing the adsorption energy from −0.2 to −2.22 eV and favored the formation of O 2 ·− . Electron spin resonance and radical-quenching experiments showed that O 2 ·− was the major reactive species in the degradation of Acetaminophen (paracetamol, APAP).
研究领域:
环境科学
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材料科学
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化学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 19
·7482-7490
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IF 3.069
Peng Liu,Jianhong Yi,Rui Bao,Dong Fang
Coprecipitation, calcination and photoreduction, in a combined method, were successfully employed to fabricate a flower-like Zn3V2O8 (ZnVO)/nano-precipitated Ag composite powder. XRD, XPS, FESEM, TEM, UV-vis and PL methods were utilized to investigate its microstructure and optical performance. Results showed that the photocatalytic performance was improved due to the expanded absorption edge in the visible light region, narrowed band gap and low recombination rate of electron–hole pairs. Theoretical calculations based on density functional theory (DFT) showed that the band-gap of ZnVO could be narrowed by the hybridization of the O 2p and Zn 3d orbitals of ZnVO–Ag and the formed silver nanoparticles were beneficial for the excitation of the valence band electrons into the conduction band. Furthermore, the electric field distribution simulated by the finite-difference time-domain (FDTD) method suggested that the separation of electron–hole pairs could be accelerated by the silver SPR effect and the Schottky barrier between silver and ZnVO. Finally, a tentative mechanism of the photodegradation properties was explored based on microstructural and photocatalytic analysis.
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
MATERIALS RESEARCH BULLETIN
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2019
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IF 3.355
Zhendong Liu,Zhen Ma
TiO 2 has been regarded as an efficient benchmark photocatalyst that can work under ultraviolet light. However, further modification of TiO 2 for achieving even higher photocatalytic activities is necessary for practical applications and for enriching the family of TiO 2 -based photocatalysts. Herein, a novel Ag-SrTiO 3 /TiO 2 photocatalyst was prepared by hydrothermally treating TiO 2 nanosheets in an aqueous Sr(OH) 2 solution (to form SrTiO 3 nanocubes supported on TiO 2 nanosheets) followed by depositing Ag nanoparticles via photoreduction in the presence of an aqueous AgNO 3 solution. In this case, Ag nanoparticles were found to be deposited on both SrTiO 3 and TiO 2 surfaces. The resulting Ag-SrTiO 3 /TiO 2 was found to be more active than reference catalysts such as TiO 2 , SrTiO 3 /TiO 2 , Ag/TiO 2 , and Ag/SrTiO 3 in photocatalytic degradation of rhodamine B (RhB) and ciprofloxacin hydrochloride (CIP) under simulated sun light. Relevant catalysts were characterized systematically, and possible reasons for the enhanced activity of Ag-SrTiO 3 /TiO 2 was explained.
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 COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Yu Chen,Chengyu Rong,Wenhui Gao,Siyu Luo,Yuxin Guo,Yingqiu Gu,Guohai Yang,Weiqing Xu,Chengzhou Zhu,Lu-Lu Qu
Reactive oxygen species (ROS) are ideal alternative antibacterial reagents for rapid and effective sterilization. Although a variety of ROS-based antimicrobial strategies have been developed, many are still limited by their inefficiency. Herein, we report the synthesis of the Ag-MXene nanozyme, which have superior peroxidase-like activity for antibacterial applications. As a result, Ag-MXene nanozyme can efficiently increase the level of intracellular ROS, converting H 2 O 2 into hydroxyl radicals that effectively kill both Gram-negative and Gram-positive bacteria and disrupting the bacterial biofilm formation. Moreover, a sensitive and selective colorimetric biosensor was constructed for assaying cholesterol based on the Ag-MXene’s prominent peroxidase-mimicking activity and the cholesterol oxidase cascade reaction. The biosensor exhibits high performance with a linear cholesterol detection range of 2–800 μM, and a detection limit of 0.6 μM. Ag-MXene nanozyme can be used for the rapid detection of cholesterol in serum without complicated sample pretreatment. Collectively, it is conceivable that the proposed Ag-MXene nanozyme could be used as a biocide and as a cholesterol sensor. This study provides a broad prospect for the rapid detection and sterilization of MXene nanozymes in the biomedical field.
研究领域:
生物医学
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材料科学
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分析化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Shixue He,Chao Yang,Mingguang Niu,Dandi Wei,Shasha Chu,Mei Zhong,Jide Wang,Xintai Su,Lu Wang
Well-defined deposition of noble metal nanoparticles is attractive for the synthesis of heterogeneous metal catalysts with excellent activity, stability, and easy separability. Herein, a facile method combining surface coordination deposition with thermal decomposition has been proposed to fabricate Ag/CoFe 2 O 4 composites as magnetic catalysts for hydrogenation reduction of 4-nitrophenol and 2-nitroaniline. This method involved the adsorption of silver ions on cobalt-ferrous oxalate through the surface coordination, and then the thermal decomposition into Ag/CoFe 2 O 4 . The characterizations of XRD , SEM, FTIR, BET, VSM , XPS and Element mapping were utilized to reveal that Ag/CoFe 2 O 4 exhibited a magnetic saturation of 40.4 emu g −1 , a specific surface area of 58.8 m 2 g -1 , and an even distribution of metallic Ag on CoFe 2 O 4 particles. Catalytic reduction tests of 4-nitrophenol and 2-nitroaniline indicated that the Ag contents in Ag/CoFe 2 O 4 seriously affected the catalytic activity of the catalysts. Moreover, the durability test showed that Ag/CoFe 2 O 4 still preserved ∼74.6% of the initial catalytic activity even at the 20th run.
研究领域:
化学
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材料科学
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催化反应
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DOI
高影响因子
Journal of Materiomics
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2015
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IF 0
Junwei Fu,Shaowen Cao,Jiaguo Yu
Photocatalytic hydrogen generation is one of the most promising solutions to convert solar power into green chemical energy. In this work, a multi-component TiO 2 –Ag–Cu 2 O composite was obtained through simple impregnation-calcination of Cu 2 O and subsequent photodeposition of Ag onto electrospun TiO 2 nanotubes. The resulting TiO 2 –Ag–Cu 2 O photocatalyst exhibits excellent photocatalytic H 2 evolution activity due to the synergetic effect of Ag and Cu 2 O on electrospun TiO 2 nanotubes. A dual Z-scheme charge transfer pathway for photocatalytic reactions over TiO 2 –Ag–Cu 2 O composite was proposed and discussed. This work provides a prototype for designing Z-scheme photocatalyst with Ag as an electron mediator.
研究领域:
材料科学
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能源科学
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DOI
JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Ling Zhou,Jie Yang,Xinyue Wang,Gao Song,Fan Lu,Lijun You,Jumei Li
A novel highly active surface enhanced Raman scattering (SERS) substrate of Ag nanoparticles decorated Ag@ZrO 2 composite nanosphere was prepared and characterized. A uniform ZrO 2 shell was firstly coated over Ag cores by sol-gel process using zirconium butoxide as Zr precursor to achieve Ag@ZrO 2 nanospheres and then Ag nanoparticles were in situ deposited on the Ag@ZrO 2 through the reduction of AgNO 3 to produce Ag@ZrO 2 @Ag composite nanospheres. The cover density of Ag nanoparticles on Ag@ZrO 2 @Ag nanospheres could be controlled by changing the concentration of AgNO 3 . TEM , FE-SEM, EDX, UV–vis and XRD analyses were used to characterize their morphology, structure and composition . The SERS property of Ag@ZrO 2 @Ag was evaluated using 4-mercaptobenzoic acid (4-MBA) as Raman probe molecules. The experimental results showed Ag@ZrO 2 @Ag nanospheres presented remarkably SERS activity, high signal reproducibility (RSD = 6.39%) and exceptional storing stability. Subsequently, the Ag@ZrO 2 @Ag nanospheres acted as SERS substrates to sense Cr (VI) in water at various concentrations, and the SERS results showed great linear correlation between SERS intensities and the concentration of Cr (VI) (R 2 = 0.97) with the detection limit of 0.5 μM, which is below the safety level (1 μM) in drinking water of United States Environmental Protection Agency. The Ag@ZrO 2 @Ag nanospheres were also successfully used to confirm the concentration of Cr (VI) in real industrial wastewater. These results demonstrated the extraordinary potential of Ag@ZrO 2 @Ag composite nanospheres serving as SERS substrates for trace and quantitative determination of Cr (VI) in environmental field.
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
IEEE SENSORS JOURNAL
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2025
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IF 4.5
Zelong Li,Xuemei Lin,Zengshan Yu,Guochao Shi,Wenying Zhou,Jiahao Cui,Shan Guo,Mingli Wang
Accurate and sensitive detection of bilirubin, cholic acid, and Alanine aminotransferase (ALT) is essential for the early detection of hepatobiliary diseases in healthcare and the medical field. Integrating surface-enhanced Raman scattering (SERS) with deep learning algorithm has shown great application prospect in the early identification of markers of hepatobiliary diseases. Here, an regular Ag decorated Cu-Ag nanoisland-liked SERS biosensor (Ag@5/Ag-Cu@20/PSS) was constructed by using pattered sappire substrate as a template. An additional 5 mins of Ag nanofilm significantly improved the SERS signal intensity and homogeneity, and the sensitivity was enhanced by two orders of magnitude up to 10-10 M for 4-aminothiophenol (4-ATP). Importantly, deep learning algorithms included temporal convolutional networks (TCN), convolutional neural networks (CNN), recurrent neural network (RNN) and Transformer were used to deeply mine SERS spectral data of bilirubin, cholic acid and ALT, extract effective features, and establish an accurate classification and prediction model. Results indicating that the developed SERS biosensor combined with Transformer model demonstrated excellent accuracy (ACC) of 0.9816±0.0090 in qualitatively and quantitatively analyzing of bilirubin, cholic acid, and ALT. The successful application of the SERS biosensor will help improve the accuracy of early identification of bilirubin, cholic acid, and ALT disease markers and promote the early intervention and treatment of hepatobiliary diseases.
研究领域:
生物医学工程
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分析化学
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人工智能
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DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2023
·Vol. 53
·期 2
·899-906
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IF 2.1
Wang Caiyun,Zhou Yanhong,Liu Zhimin
A composite of WO 3 and WS 2 has a wider wavelength range of light adsorption and light emission than WS 2 . A noble metal nanostructure can be utilized to adjust the photoluminescence (PL) of luminescent materials. In this study, WO 3 -WS 2 flakes were synthesized. A straightforward bath method has been employed to synthesize Ag nanoparticles (NPs). The average size of Ag NPs is approximately 60 nm. The Fourier transform infrared (FT-IR) peak of WO 3 -WS 2 flake at 495 cm −1 is from an alkane S–S bond stretching vibration. The PL intensity of WO 3 -WS 2 was attenuated subsequent to its integration with Ag NPs. The PL quantum yield of the WO 3 -WS 2 /Ag composite can reach 0.11%. This occurrence can be explained by the pronounced resonance absorption and diminished light extraction induced by the Ag NPs. This decreased light emission of the Ag NPs incorporated with WO 3 -WS 2 may be employed in some situations needing extinction, such as photography and projection. Graphical Abstract
研究领域:
材料科学
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光学
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DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 48
·30051-30059
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IF 3.108
Minghui Shang,Huilin Hou,Fengmei Gao,Lin Wang,Weiyou Yang
Photocatalytic hydrogen evolution is a promising solution to energy and environmental problems. The grand challenge for its application is how to make photocatalysts with satisfactory efficiency. In the present work, exploration of Ag@TiO2 mesoporous nanofibers via two strategies is reported, namely in situ electrospinning preparation (strategy I) and electrospinning combined with subsequent photodeposition (strategy II). The photocatalytic behavior of the as-synthesized Ag@TiO2 hybrid nanofibers was evaluated in terms of hydrogen evolution efficiency for the photodecomposition of water under Xe lamp irradiation. It was found that incorporation of Ag nanoparticles into the TiO2 mesoporous nanofibers could enhance remarkably their photocatalytic efficiency. The products prepared through strategy I exhibited the highest photocatalytic performance as compared with those prepared by strategy II. Current work might give some insight into exploration of stable binary photocatalysts, which have potential applications for efficient hydrogen evolution.
研究领域:
材料科学
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能源科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Xian Li,Jiafeng He,Weilong Zhang,Lijun You,Jumei Li
A sandwich structured Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) magnetic nanosphere with Ag nanoparticles as an interim layer was fabricated with in situ deposition of Ag nanoparticles onto Fe 3 O 4 nanospheres and subsequent coating an outmost shell of mesoporous TiO 2 -ZrO 2 . As compared to Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag with Ag nanoparticles as the outmost layer, unique Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) sandwich nanospheres possess higher efficient charge migration and larger specific surface area disclosed by the BET and photoelectrochemical characterizations, so they present improved photocatalytic activity toward Cr(VI) reduction. In addition, they have high thermal stability because mesoporous TiO 2 -ZrO 2 outmost shell could protect the interim Ag nanoparticles from damage and agglomeration at high temperature. Results showed reduction efficiency of Cr(VI) of Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) reached 98.4 % in 30 min, as 1.6 times as that of Fe 3 O 4 /m(TiO 2 -ZrO 2 )/Ag. The Fe 3 O 4 /Ag/m(TiO 2 -ZrO 2 ) still obtained 91.3 % and 87.9 % reduction ratio after calcination at 500 ℃ and recycling 5 times, respectively. The photocatalytic mechanism was also revealed by scavenger experiments and ERP analysis. This work provided a good example for further design and preparation of magnetic photocatalysts with high performance for the remediation of heavy metal pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2021
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IF 4.527
Xin Liu,Mengmeng Fan,Xuguang Zhu,Zengguo Tian,Xin-Jian Li,Hongzhang Song
Bi 2 Sr 2 Co 2 O y with excellent thermoelectric properties has received extensive attention from scientific researchers. In this study, Bi 2 Sr 2 Co 2 O y ceramic samples were prepared using the solid-phase sintering method. By Ag + substitution for Bi 3+ , the hole concentration and electrical conductivity were optimised. On this basis, nano-SiC particles were introduced to increase grain boundaries, improve phonon scattering, reduce the mean free path of phonons, and reduce the lattice thermal conductivity . A sample with a nominal composition of Bi 1.8 Ag 0.2 Sr 2 Co 2 O y + 0.025 wt% SiC had a maximum ZT value of 0.35 at 923 K, which was approximately 67 % higher than the ZT value of pure Bi 2 Sr 2 Co 2 O y . These results confirmed that under the combined action of Ag substitution and SiC doping, the thermoelectric performance of Bi 2 Sr 2 Co 2 O y was significantly improved.
研究领域:
材料科学
·
热电材料研究
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DOI
高影响因子
危险品化学品经营许可证（带存储）