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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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4227-4243
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IF 1.674
Deng Anquan,Zhu Yufu
TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres have been synthesized via a low-temperature hydrothermal method using SiO 2 spheres as templates, combined with a light-induced reduction method and a hydrogen peroxide oxidation process. Scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses have demonstrated that Ag and Ag 2 O nanoparticles were successfully deposited on the surfaces of TiO 2 /SiO 2 nanocomposite spheres and porous TiO 2 nanospheres forming nanoheterojunctions. The photocatalytic experiment results reveal that all the as-prepared catalysts possess improved photocatalytic activities compared with P25 nanoparticles. Both TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres exhibit excellent photocatalytic performances, which can be attributed to the synergistic effects of different kinds of nanoparticles. The synergistic mechanism of these nanoparticles is also discussed in detail.
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COMPOSITE INTERFACES
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2020
·
IF 2.32
Lele Liu,Piqi Zhao,Shoude Wang,Ning Xie,Han Wang,Valeria Strokova,Lingchao Lu,Xin Cheng
How to give a full play of the photocatalytic performance of TiO2 in coatings has attracted immense academic interests in recent years. A major challenge is the good dispersion, more reactivity area and cost-effective fabrication. Here, TiO2-silica aerogel composite (AG/TiO2) was achieved in one step by silane coupling reaction. And the absorbance test proved that the bonding between them possessed satisfactory mechanical stability. SEM-EDS and BET analysis showed TiO2 could be well dispersed on the surface of AG clusters until it reached the maximum load amount approximate 6 wt%, which was in accordance with the regularity of photocatalytic performance. In the case of the optimum, the RhB degradation rate of AG/TiO2 could reach 82% by UV irradiation for 4 h. Subsequently, AG/TiO2 was mixed with polyacrylate emulsion to prepare photocatalytic functional coating. During the film formation process, the AG/TiO2 particles were supposed to migrate up spontaneously, which was proved by semi-quantitative XPS analysis of Si-dispersion. It would undoubtedly improve the rate of effective utilization of TiO2 in coatings. And the photocatalytic efficiency of RhB could be up to 88% at a low percentage (6%) after 8 h UV illumination. Furthermore, we also proved that the gradient-dispersed AG/TiO2 did not impair the mechanical properties of PAE coating.
研究领域:
材料科学
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环境科学
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Biomaterials Science
·
2022
·Vol. 10
·期 7
·1812-1820
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IF 7.59
Yanping Xu,Dinghu Zhang,Jie Lin,Xiaoxia Wu,Xiawei Xu,Ozioma Udochukwu Akakuru,Hao Zhang,Zhewei Zhang,Yujiao Xie,Aiguo Wu,Guoliang Shao
Circulating tumor cells (CTCs) usually shed from primary and metastatic tumors serve as an important tumor marker, and easily cause fatal distant metastasis in cancer patients. Accurately and effectively detecting CTCs in a peripheral blood sample is of great significance in early tumor diagnosis, efficacy evaluation, and postoperative condition monitoring. In this work, a TiO2@Ag nanostructure is structured as a SERS substrate, rhodamine 6G (R6G) is used as a Raman signal molecule, the reduced bovine serum protein (rBSA) acts as a protective agent, and folic acid (FA) acts as a target molecule to specifically recognize cancer cells. A TiO2@Ag-based SERS bioprobe is successfully prepared with the feature of ultrahigh sensitivity, good specificity, low toxicity, and high accuracy in CTC detection. The remarkable SERS activity of the TiO2@Ag nanostructure is synergistically contributed by surface plasmon resonance and photon-induced charge transfer mechanism. The limit of detection for rhodamine 6G (R6G) molecules adsorbed on the TiO2@Ag SERS substrate is 5 × 10−14 M, and the corresponding SERS enhancement factor can reach 7.61 × 107. The designed TiO2@Ag–R6G–rBSA–FA SERS bioprobe is effectively utilized in detecting various cancer cells in rabbit blood, and the limit of detection (LOD) for the target cancer cell is 1 cell per mL. Notably, CTCs in peripheral blood of six clinical liver cancer patients are successfully recognized via the TiO2@Ag-based SERS bioprobe. Accurately recognizing CTCs in peripheral blood based on the TiO2@Ag–R6G–rBSA–FA SERS bioprobe is also carefully verified by in situ immunofluorescence staining experiments, which directly supports the CTC detection accuracy of the SERS strategy. These results demonstrate that the TiO2@Ag-based SERS bioprobe has great application potential in early screening and diagnosis of tumors.
研究领域:
生物医学工程
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纳米技术
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癌症生物学
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分析化学
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 26
·11076-11084
·
IF 3.288
Yin'an Zhu,Ye Pan,Enming Zhang,Weiji Dai
Hetero-junctions are widely considered as efficient and promising separators for photogenerated electron–hole pairs in photocatalytic processes. In this work, a self-assembled urchin-like TiO2@Ag–CuO hetero-junction was fabricated via a two-step approach combining a dealloying method with calcination using alloy ribbons as the precursors. This nanostructure exhibits enhanced degradation efficiency toward tetracycline hydrochloride (TC) under visible light irradiation, achieving a degradability of 82.86% after 3 hours, higher than those of P25, CuO, TiO2@Ag and TiO2@CuO binary hetero-junctions. The photocurrent response and electrochemical impedance spectroscopy studies reveal that the TiO2@Ag–CuO hetero-junction possesses an excellent separation ability and a long lifespan with regard to photogenerated electron–hole pairs, which may contribute to its enhanced photocatalytic ability. In addition, this unique nanostucture maintained good degradation stability even after four-cycle utilization. The findings of this work provide new ideas to prepare multicomponent hetero-junctions for water purification.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
·
IF 7.46
Xiuting Li,Hongmei Liu,Chenjie Gu,Jinjie Zhang,Tao Jiang
The acquisition of a robust plasmonic substrate with both appreciable molecule anchoring and quantitative detection features is a prerequisite for the reliable adhibition of surface-enhanced Raman scattering (SERS) technology. Herein, an innovative sophisticated SERS substrate was proposed by spin-coating titanium dioxide (TiO 2 ) onto a flexible polydimethylsiloxane (PDMS) film followed by the modification of triangular silver (Ag) nanoplates through in-situ reduction. The absence of organic surfactants during this process rendered the substrate great opportunity in effectively enriching molecules and the assembly of TiO 2 and Ag made it a reusable and sensitive SERS platform. After a recyclable monitoring of 4-aminothiophenol (4-ATP) with different concentrations was carried out by reusing the hybrid substrate for 8 cycles, a limit of detection as low as 1.58 × 10 −9 M was achieved. The distinctive intrinsic Raman signal from PDMS matrix was further verified to successfully correct the poor detection linearity by serving as internal standard and the coefficient of linear correlation (R 2 ) was improved from 0.967 to 0.997. In this regard, the as-prepared multifunctional PDMS/TiO 2 /Ag hybrid substrate with simulation-estimated electromagnetic “hot spots” exhibited remarkable quantitative recyclable detection performance.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
·
IF 3.9
Jieying Su,Haitao Zhang,Yuanyuan Gong,Qinqin Xu,Maohua Hou,Bin Xu
To develop a material that can be applied in the field of thermoregulation materials for residential buildings and degradation of organic pollutants. A novel microencapsulated phase change material, paraffin@TiO 2 /Ag, was prepared using interfacial condensation technology. The paraffin@TiO 2 /Ag microcapsules' melting point and latent heat were 48.00 °C and 63.56 J/g, respectively, according to the DSC study results, and their encapsulation rate was 46.11 %. In addition, the experimental results of photocatalytic degradation of MB (methylene blue) showed that the paraffin@TiO 2 /Ag microcapsules had high photocatalytic activity for organic dyes under natural light, and the degradation rate of MB reached 99 % when the light exposure time reached 4 h. By comparing the reaction rate constant of MB by paraffin@TiO 2 microcapsules (0.98969 h −1 ) with that of MB by paraffin@TiO 2 /Ag microcapsules (1.15845 h −1 ), it was learned that the introduction of Ag nanoparticles effectively improved the photocatalytic activity of the phase change microcapsules.
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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
Jie Yang,Ling Zhou,Xin-Yue Wang,Gao Song,Li-Jun You,Ju-Mei Li
Herein, the robust core-satellite Ag/TiO 2 /Ag composite nanospheres were successfully developed. We firstly fabricated large silver nanoparticles with sufficient plasmonic activity as cores and then encapsulated uniform titanium dioxide interlayer shell around Ag cores, which serves as the highly functionalized substrates to achieve uniform and plentiful surface chemical properties. Next, the outer shell of small silver satellites was formed in-situ via controllable reduction of AgNO 3 by n -butylamine, which acts as the remarkable enhancer for surface enhanced Raman scattering (SERS). The Ag/TiO 2 /Ag composite nanospheres with exceptional SERS sensitivity were easily prepared via facilely tuning the coverage and grain sizes of silver satellites. Then the optimized Ag/TiO 2 /Ag composite nanospheres were employed to quantitatively detect methylene blue (MB) in solution. The results showed good linear relationship between SERS intensities and logarithm concentrations of MB and the limit of detection is low to 10 −10 M. Moreover, the highly uniform and robust Ag/TiO 2 /Ag composite nanospheres display outstanding reproducibility (RSD = 4.02%) and highly storage stability. Owing to the intrinsic catalytic activity of small Ag satellites, Ag/TiO 2 /Ag nanospheres were further applied to effectively follow the degradation reaction process of crystal violet by SERS. Altogether, the core-satellite Ag/TiO 2 /Ag nanospheres present multiple SERS application potential in various fields, such as quantitative chemical analysis, trace detection of pollutants and in-situ reaction monitoring.
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaoyan He,Yanling Liang,Jing Li,Yuanyuan Lu,Xin Tian,Zhiqiang Wang,Runze Cao,Penggai Ma,Shuo Ma,Xiaoquan Lu
Solar interfacial evaporation technology, as an emerging sustainable water purification strategy, provides both an economical and environmentally friendly way to solve water resource problems. However, it still faces certain limitations and challenges in treating polluted wastewater containing volatile organic compounds (VOCs). In this paper, MXene-TiO 2 -Ag composites were embedded into a polyvinyl alcohol (PVA) hydrogel system using kapok fibres as biomass templates, and a bifunctional and environmentally friendly solar evaporation system (MTAH) was successfully constructed for both efficient solar freshwater production and phenol removal (typical VOC). The MTAH evaporator demonstrated excellent evaporation performance with an evaporation rate as high as 3.09 kg m −2 h −1 and a photothermal conversion efficiency as high as 93.16 % under 1 solar light intensity. The self-growth property of TiO 2 on the MXene surface endowed the evaporator with the ability of photocatalytic degradation of pollutants. In addition, the incorporation of trace Ag nanoparticles played positive roles, which not only significantly enhanced the photothermal conversion performance of MXene, but also broadened the light response range of TiO 2 and effectively suppressed the complexation of photogenerated electron-hole pairs. The MTAH evaporator shows an excellent removal rate of 91.84 % for high VOC concentrations (100 ppm phenol), effectively avoiding secondary contamination of the condensate. The finding paved the course for the sustainable and eco-friendly solution for freshwater scarcity.
研究领域:
材料科学
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环境工程
·
太阳能利用
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光催化
·
水净化
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Ao Li,Linbei Xie,Sijie Zhou,Min Zhang,Yi Ding,Ping Wang
In this study, the magnetic core-shell nanomaterial Fe 3 O 4 /SiO 2 /N-TiO 2 /Ag/AgCl (FSNT/Ag/AgCl) that efficiently degraded methyl orange (MO) was produced. The dosages of tetrabutyl titanate (TBOT), urea and AgNO 3 were optimized by response surface methodology (RSM). Scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy analysis (XPS), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD), fourier transform infrared spectrometer (FT-IR), and UV–vis diffuse reflectance spectrum (UV–vis DRS) were used to characterize the nanomaterial. The particle size of FSNT/Ag/AgCl was 91.98 nm, and it presented a core-shell structure with Fe 3 O 4 as the core, SiO 2 and N-TiO 2 wrapped in Fe 3 O 4 , and Ag/AgCl deposited on the outermost layer. Performance and mechanism research experiments showed that under the optimized conditions of 1 g/L FSNT/Ag/AgCl, pH = 9, temperature of 35℃ and initial MO concentration of 10 mg/L, about 90 % of MO was degraded in 20 min. The mineralization rate was 35.2 % within 120 min. Holes (h + ) and superoxide anions (·O 2 − ) were the main active substances in the whole photocatalytic degradation. FSNT/Ag/AgCl could be recovered by magnet. After 5 repeated experiments, the degradation rate of MO within 100 min still reached 88.5 %. This work provides a recyclable core-shell nanomaterial for faster degradation of dye wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Lei Wang,Changbo Zhang,Feng Gao,Gilles Mailhot,Gang Pan
Algae as an abundant natural biomass, more attention has been paid to explore its potential application in environmental pollutants treatment. This work prepared the algae-TiO 2 /Ag bionano hybrid material by loading algae cells on the ultrafine TiO 2 /Ag chitosan hybrid nanofiber mat. For the first time, the synergistic photocatalytic effect of fresh algae and TiO 2 /Ag nanomaterial was investigated by removal of Cr(VI). The addition of algae significantly improved the photo-removal of Cr(VI) in the system with TiO 2 /Ag hybrid nanomaterial under visible light irradiation. Meanwhile, the photocatalytic mechanism was studied. The photogenerated reactive oxygen species were quantified and the addition of algae apparently decreased the yields of OH to 31.0 μM, while improved the yields of 1 O 2 and O 2 − in the reaction system with TiO 2 /Ag hybrid nanofiber mats. The change of superoxide dismutase activity and malondialdehyde content in algae indicated that TiO 2 /Ag could impose oxidative stress and cause lipid peroxidation in algae cells. During the course of irradiation, algae released substances could act as scavenger for holes, thus inhibited the recombination of hole/electron and enhanced the photocatalytic reduction of Cr(VI) by electrons on TiO 2 surface. Algae was simultaneously photodegraded in the system and the resulting O 2 − , organic free radicals could promote the reduction of Cr(VI). This functional hybrid nanofiber mat was easily recovered and maintained a great photocatalytic activity on the five successive cycles. This algae-photocatalyst hybrid material has promising applications potential in heavy metal removal and organic pollutants treatment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Haifeng Zhu,Renjie Ding,Jiashun Zhou,Zhiyuan Lang,Huihua Luo,Kehui Xue,Yaping Zhang,Lianqing Yu
This work proposes a novel strategy which the microwave plasma chemical vapor deposition (MPCVD) technology was used as one important preparation process for synthesizing TiO 2 @Ag@graphene ternary junction. The ternary junction exhibits an enhanced photocatalytic hydrogen production rate of 4.44 mmol·g −1 ·h −1 , which is approximately 9.25 times higher than that of pure TiO 2 (0.48 mmol·g −1 ·h −1 ). The remarkable photocatalytic activity can be attributed to the strong synergistic effect between TiO 2 @Ag and graphene. The loaded Ag and graphene can not only act as electronic conductors to effectively promote the separation of charges, but also obviously improve the response of visible light of TiO 2 . The photogenerated electrons are transferred from TiO 2 to graphene via the Ag medium was further verified by DFT calculations. Constructing an Ag-graphene interface can activate carbon atoms, which can quickly capture electron to fill the π* orbital of graphene. TiO 2 @Ag@graphene ternary junction exhibits a lower ΔG H* value of 0.51 eV than that of TiO 2 @Ag (1.49 eV), which indicates that TiO 2 @Ag@graphene ternary junction with optimal absorption energy for the hydrogen intermediate.
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高影响因子
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