CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Qinglong Zeng,Xiaofeng Xie,Xiao Wang,Yan Wang,Guanhong Lu,David Y.H. Pui,Jing Sun
The ever increasing problem of air pollution has provoked the research and development of highly-efficient photocatalysts. Herein, Ag nanowires@TiO 2 composite photocatalyst with improved photocatalytic performance was fabricated by a facile one-step solvothermal procedure. The formation of one-dimensional Ag nanowires@TiO 2 core-shell nanostructures could not only broaden the light-absorbing range of TiO 2 catalysts through the surface plasmon resonance effect of Ag nanowires , but also enable the effective separation of photoinduced electron-hole pairs. Under the irradiation of a 260 W fluorescent lamp, the composite with 0.5 wt% Ag nanowires exhibited the highest photocatalytic activity in short contact time (4.8 min), and the corresponding gaseous acetaldehyde removal ratio was 72%, which was much higher than that of bare TiO 2 (37%). The photocatalyst also showed ultrastable activity in the 15 weeks usage, which ensured their practical applications in the air purification field. An in-depth mechanism of the photodecomposition of acetaldehyde was proposed on the basis of the electron spin resonance (ESR) tests and the scavenger experiments. O 2 − reactive radicals was found to play a predominant role in the oxidation and decomposition of acetaldehyde. The outstanding performance of the composite materials and the thoroughly understanding of the reaction mechanism would cast light on the purposively design and optimization of TiO 2 -based catalysts.
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
JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 10
·1-10
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IF 2.009
Jiang Xinde,Wang Zhenxi,Zhang Xiaohang,Jiang Guixian,Peng Yong,Xu Sheng,Cao Meng,Dai Xin,Liu Zuhan,Ma Jianye
A green bioreduction method was used to prepare highly efficient supported TiO 2 photocatalysts with bimetallic (Au-Ag) nanoparticles at room temperature using Cinnamomum camphora leaf extract as both the protective agent and reducing agent. The resulted Au-Ag/TiO 2 exhibits high photocatalytic activity toward the degradation of organic dyes. It was demonstrated that after some of the biomolecules were removed through ionic-liquid extraction and/or calcinations, the Au-Ag/TiO 2 photocatalyst exhibits significantly enhanced catalytic performance toward the degradation of methyl orange compared to the pristine untreated catalyst. As a result, 300 mL of 20 mg/mL methyl orange can be fully degraded in 30 min. These can be explained by the sufficient biomolecules could protect the nanoparticles stay in small size, but excess biomolecules played an unfavorable role in hindering the electron transportation during the catalytic reaction. The low-cost preparation, the high activity, together with the good stability and recyclability make this developed Au-Ag/TiO 2 a promising photocatalyst toward the degradation of wastewater.
研究领域:
环境科学
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材料科学
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生物学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Weie Wang,Qinqin Sang,Ming Yang,Juan Du,Libin Yang,Xin Jiang,Xiaoxia Han,Bing Zhao
Herein, a surface-enhanced Raman scattering (SERS) strategy based on semiconducting substrate was exploited for detection of several antibiotic residues both in ultrapure water system and in actual water system. The as-prepared Ag-TiO 2 (Ag synchronously deposited and doped TiO 2 ) nanoparticle SERS-active substrate can achieve high sensitive SERS detection for difloxacin hydrochloride, ciprofloxacin, enrofloxacin, danofloxacin and enoxacin (five widely used quinolone antibiotics) in actual water samples, and the detection limits are as low as 4.36 × 10 −12 , 7.08 × 10 −11 , 3.94 × 10 −11 , 3.16 × 10 −11 and 3.15 × 10 −10 mol/L, respectively. These detection limits are far below the maximum of residue limit (3.01 × 10 −7 mol/L) stipulated by the European Union. And, the desirable quantitative relationships can be obtained in a wide concentration range. The recoveries of five antibiotic residues from spiked actual water samples are found to be more than 80.8% with the relative standard deviations between 2.1% and 4.7%. Even, the proposed SERS method can accurately distinguish every antibiotic species from a mixed antibiotic residue sample with multiple antibiotics. And, Ag-TiO 2 nanoparticles can also serve as an efficient photocatalyst for photocatalytic degradation of these antibiotic residues, which provides a multi-functional platform for synchronous determination and degradation of antibiotic residues in real environment.
研究领域:
环境科学
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分析化学
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药学
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DOI
PubMed
高影响因子
Polymers
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2018
·Vol. 10
·期 6
·586
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IF 2.935
Xizi Chen,Fei Liang,Wenzhong Lu,Zheng Jin,Yifei Zhao,Ming Fu
In this paper, nanocomposites that contain core-shell Ag/TiO2particles as the filler and polytetrafluoroethylene (PTFE) as the matrix were investigated. Two surfactants, namely octyl phosphonic acid (OPA) and pentafluorobenzyl phosphonic acid (PFBPA), were applied to modify Ag/TiO2fillers for uniform dispersion in the matrix. Fourier transform infrared spectroscopy analysis of bonds between the TiO2shells and the phosphonic modifiers shows Ti–O–P chemical bonding between the Ag/TiO2fillers and the modifiers. Thermogravimetric analysis results show a superior adsorption effect of PFBPA over OPA on the Ag/TiO2filler surface at the same weight percentage. For nanocomposites that contain modified Ag/TiO2nanoparticles, the loss was reduced despite the high permittivity at the same loading. The permittivity of the nanocomposites by PFBPA is larger than that of OPA, because the more uniform dispersion of inorganic particles in the PTFE matrix enhances the interfacial polarization effect. The mechanism of enhanced dielectric performance was studied and discussed.Keywords:core–shell structure;interfacial modification;dielectric properties;nanocomposites
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
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2015
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IF 4.772
Dong Yang,Yuanyuan Sun,Zhenwei Tong,Yao Tian,Yuanbing Li,Zhongyi Jiang
Inspired by the bioadhesion mechanism found in mussel, a catechol derivative, 3-(3,4-dihydroxyphenyl)propionic acid (diHPP), is employed as both linker and reducer of Ag+ to synthesize the Ag/TiO2 nanotube (Ag/TNT) heterojunction under ambient conditions in this study. In the prepared Ag/TNT composite, Ag nanocrystals about 3.8 nm in diameter distribute over the TNT surface uniformly and form the heterojunction structure with TNT. The diHPP first links to the TNT surface through the bidentate chelation of catechol group with Ti4+ and then acts as both an anchor and a reducer to in situ nucleate and grow Ag nanocrystals on the TNT surface. By adjusting the AgNO3 concentration, the loading amount of Ag nanocrystals on the TNT surface can be controlled easily, and the visible-light absorption ability of Ag/TNT heterojunctions enhances with increasing the Ag loading amount. Moreover, their photocatalytic activity was evaluated by the degradation capability of Rhodamine B (RhB) under visible light. The Ag/TNT heterojunctions exhibit the high visible-light photocatalytic activity, which can almost degrade 100% RhB within 2 h. This excellent performance can be attributed to the local electric field caused by the surface plasmon resonance (SPR) of Ag nanocrystals and the high adsorption capability of TNTs with large specific surface area.
研究领域:
材料科学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
COMPOSITE INTERFACES
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2020
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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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DOI
高影响因子
APPLIED THERMAL ENGINEERING
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2017
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IF 3.444
Haoran Li,Yurong He,Ziyu Liu,Yimin Huang,Baocheng Jiang
Research in collection and conversion of solar energy has attracted an increasing interest because of the fact that conventional energy resources are becoming increasingly exhausted. For this reason, Ag@TiO 2 core–shell nanoparticles (NPs) with great absorptivity in the visible region were synthesized in this work. Subsequently, an experimental study on photo-thermal performances including steam generation and solar energy capture in a thermal receiver containing the Ag@TiO 2 NPs-based nanofluids was conducted. The effects of the NP concentration as well as the optical concentration were taken into consideration. The results showed that the nanofluids can be used for direct steam generation with a short period of solar irradiation time, even at the illumination intensity of 1 sun (1 sun = 1 kW/m 2 ). An evaporation efficiency of 53.6% can be achieved when the NP concentration is only 200 ppm owing to local heating induced by the surface plasmon resonance of the NPs. In addition, it is found that the nanofluid with a lower NP concentration has a higher temperature rise during illumination. Our findings also showed that the absorbed solar energy is transferred preferentially into latent heat enthalpy and consumed for steam generation instead of heating the nanofluids.
研究领域:
材料科学
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能源研究
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纳米技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Yan Yang,Zhijie Zhang,Yali He,Zhihua Wang,Yanbao Zhao,Lei Sun
In order to develop a novel method for bacteria detection, Ag@TiO 2 electrospinning Nanofibrous felts have been fabricated by in situ decoration of size tunable Ag nanoparticles on anatase TiO 2 nanofibers. The morphologies and structures of the as-prepared Ag@TiO 2 electrospinning nanofibrous felts were characterized by techniques of scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, and X-ray diffraction. The result show that Ag NPs were uniformly deposited on the surfaces of TiO 2 nanofibers, especially when the deposition time in Tollens’ reagent was 10 min. The free-standing composite nanofibrous felts processes superb performance of surface enhanced Raman scattering, which was demonstrated by small probe mecules of 4-mercaptobenzoic acid and 4-mercaptophenol, and the lowest detection limit was near to10 −9 mol/L. More importantly, the as-fabricated Ag@TiO 2 nanofibrous felts as SERS substrate can detect biomacromolecules such as bacteria of Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) directly without previous bacteria-aptamer conjugation as the traditonal process. In addition, the composite nanofibrous felts also show outstanding antimicrobial activities against both Gram-negative of E. coli and Gram-positive of S. aureus , evaluated by method of absorption and microscopic observation. The results show that the bacteriostasis rate is reached to 99%, especially significant for E. coli . The free-standing, high porous, and flexible substrate of Ag@TiO 2 electrospun nanofibrous membranes have potential application in versatile fields such as microorganism sensors and water purifier.
研究领域:
材料科学
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生物医学工程
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环境科学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
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2022
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IF 4.855
Yina Tan,YaFei Hou,Qian Lin,YaQian Zhen,Peng Du,LaiHui Luo,WeiPing Li
Designing and regulating the microstructure of core–shell fillers are effective ways to fabricate polymer-based nanocomposites with excellent energy storage performances. Along this line, the unique structure combination of 0D metallic Ag nanoparticles (NPs) and 1D bark-like TiO2 nanowires (NWs) were successfully prepared. Through regulating the volume fraction of Ag NPs (x vol %) in the Ag@TiO2 NWs, the polarization and breakdown strength of Ag@TiO2/PVDF nanocomposites have been optimized, which is evidenced both by the experimental results and finite element simulation. As a result, remarkably enhanced energy storage performances are realized in these nanocomposites. For instance, the 6 vol % Ag@TiO2/PVDF nanocomposite shows an excellent performance of the highest discharged energy density of 16.3 J/cm3 at 376 MV/m, increased by 222% compared with that of pure PVDF (7.4 J/cm3, 335 MV/m). Meanwhile, its charge and discharge efficiency remain up to 77% owing to the reduction of the leakage current density caused by the Coulomb blocking effect of small-sized Ag NPs and the prolonged breakdown path resulted by TiO2 NWs. This proof-of-concept study provides an innovative design thinking of the hybrid structure for obtaining nanocomposites with extraordinary energy storage performances.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2024
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IF 8.5
Peilin Wu,Jiwen Fan,Yunze Tai,Xun He,Dongdong Zheng,Yongchao Yao,Shengjun Sun,Binwu Ying,Yao Luo,Wenchuang Hu,Xuping Sun,Yi Li
Developing an accurate, cost-effective, reliable, and stable glucose detection sensor for the food industry poses a significant yet challenging endeavor. Herein, we present a silver nanoparticle-decorated titanium dioxide nanoribbon array on titanium plate (Ag@TiO 2 /TP) as an efficient electrode for non-enzymatic glucose detection in alkaline environments. Electrochemical evaluations of the Ag@TiO 2 /TP electrode reveal a broad linear response range (0.001 mM - 4 mM), high sensitivity (19,106 and 4264 μA mM −1 cm −2 ), rapid response time (6 s), and a notably low detection limit (0.18 μM, S/N = 3). Moreover, its efficacy in measuring glucose in beverage samples shows its practical applicability. The impressive performance and structural benefits of the Ag@TiO 2 /TP electrode highlight its potential in advancing electrochemical sensors for small molecule detection.
研究领域:
材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Weilin Zhong,Chao Wang,Suqing Peng,Riyang Shu,Zhipeng Tian,Yanping Du,Ying Chen
Photothermal reforming of biomass-derived hydrocarbons is an efficient approach to generate renewable hydrogen driven by solar. However, the current understanding of the general thermal effect on hydrogen production is limited since the photothermal and thermal radiation from solar is difficult to separate. Herein, an experimental study is carried out by synthesizing a series of photothermal catalysts composed of Ag nanoparticles supported on TiO 2 nanoflake (TNF). The structure of the Ag/TNF was examined by XRD , XPS , and HRTEM , respectively. The local temperature rise of the Ag/TNF was detected during the photothermal reforming reaction of the aqueous bio-glycerol, and its influence on H 2 yield was analyzed. By introducing different weight ratios of Ag nanoparticles on TNF, the equilibrium temperature was obviously increased due to the localized surface plasmon resonance (LSPR) effect and dynamic balance between LSPR and heat dissipation was found. It was observed that increasing the weight ratio of Ag particles could result in an increased temperature and lower hydrogen yields. In fact, such photothermal reforming hydrogen production was a synergistic effect between photogenerated-electrons and phonons. Therefore, precisely regulating the photothermal effect by controlling the metal nanoparticles loading to achieve proper thermal balance and high catalytic activity is one effective countermeasure to enhance hydrogen production.
研究领域:
化学工程
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可再生能源
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材料科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Weichen Zhao,Qihang Ding,Bingshuai Zhou,Jia Liu,Yujia Shi,Chengyu Liu,Chunyan Li,Biao Dong,Manlin Qi,Jong Seung Kim,Lin Wang
Sonodynamic therapy (SDT) is promising for combating deep-seated infectious diseases by generating substantial reactive oxygen species (ROS) through the profound tissue penetration capabilities of ultrasound. However, the compact protective structures of bacterial biofilms present a formidable challenge, impeding ROS efficacy. Given that ROS have a limited diffusion range and current sonosensitizers struggle to infiltrate biofilms, complete eradication of pathogenic bacteria often remains unachieved. In this study, mesoporous titanium dioxide (TiO 2 ) nanoparticles are engineered asymmetrically coated with a thin layer of Ag and loaded with L-arginine (LA) to construct ultrasound-propelled nanomotors. These Ag-TiO 2 -LA Janus nanoparticles demonstrate robust self-propulsion upon ultrasonic activation, allowing for deeper penetration into biofilm matrices and enhancing localized biofilm disruption through improved SDT outcomes. Additionally, the incorporation of Ag not only broadens TiO 2 ’s absorption spectrum but also confers photothermal capabilities upon NIR laser excitation at 808 nm. The Ag-TiO 2 -LA nanomotor amalgamates TiO 2 ’s sonodynamic potential with Ag's photothermal properties, forging a versatile antimicrobial agent capable of efficient biofilm penetration and a synergistic antibacterial effect when subjected to dual NIR and ultrasound stimuli. This innovative, singularly-structured nanoparticle stands out as an effective combatant against bacterial biofilms and accelerates the healing process of infected wounds, showcasing potential for multifaceted clinical applications.
研究领域:
纳米技术
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生物医学工程
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材料科学
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微生物学
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治疗学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）