RSC Advances
·
2016
·Vol. 6
·期 73
·69580-69585
·
IF 3.289
Xingrong Xiao,Nuoxin Xu,Yongchang Jiang,Qilong Zhang,Enjie Yu,Hui Yang
Ag-loaded TiO2 hybrid particles (TiO2@Ag) were synthesized as fillers by using an ethylene glycol reduction method. Based on this, the TiO2@Ag/P(VDF-HFP) hybrid films were prepared by embedding TiO2 nanoparticles in a poly(vinylidene fluoride-co-hexafluoropropylene) [P(VDF-HFP)] matrix. Morphology and thermal analysis show that the introduction of TiO2@Ag does not disrupt the continuity of the polymer matrix, while the strong interaction between fillers and matrix influences the crystallization process of the composite. The adhesion of Ag to TiO2 efficiently separates the Ag particles from connecting and suppresses the formation of a conductive network, and the ultra-small Ag nanoparticles “trap” the carriers due to coulombic blockade and quantum confinement effect, which results in low dielectric loss and electrical conductivity of the composites. As a consequence, the dielectric permittivity of polymer nanocomposites was enhanced by 300% over the P(VDF-HFP) matrix at a filler content of 30 vol% while maintaining a rather low dielectric loss (0.037 at 1 kHz), demonstrating promising applications in electronic devices.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Haitao Xiong,Mengyang Wang,Ruirui Qiang,Yingchun Wu,Xingwang Zheng
Photodeposited TiO 2 /Ag nanocomposites were generally used to be a friendly catalyst for degrading organic contaminant in environmental field. However, electrochemiluminescence (ECL) sensing analysis based on photocatalysts remains a significant challenge. Herein, polyvinylimide (PEI)-TiO 2 /Ag nanocomposites (PEI-TiO 2 /AgNCPs) film with reduced graphene oxide(r-GO) was constructed as a sensing interface for copper(II) ECL detection. TiO 2 /Ag nanocomposites was prepared by reversed phase microemulsion method and photodeposition technique. Moreover, it was discovered that a small amount of Cu 2+ could obviously boost the ECL signal of ninhydrin-hydrogen peroxide system. Signal amplification was achieved by using the synergistic effect between r-GO and TiO 2 /Ag nanocomposites, and the efficiently concentrated effect of PEI to Cu 2+ . Furthermore, the investigation showed that ECL mechanism of ninhydrin-hydrogen peroxide system was attributed to the generated hydroxyl radical and superoxide anion during the several type of reactions. Thus for the first time, an ultrasensitive ECL approach for detecting Cu 2+ could be performed using ninhydrin as an ECL signal probe and hydrogen peroxide as a co-reaction reagent. Under the suitable circumstances, the proposed method showed an excellent linear relationship in the concentration range of Cu 2+ from 1.0 fM to 5.0 nM. Detection limit was estimated to be as low as 0.26 fM. The sensing interface expanded the application of photodeposited TiO 2 /Ag nanocomposites in ultrasensitive ECL detection. It has potential applications in other components and biological analysis.
研究领域:
分析化学
·
环境科学
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 6
·1-11
·
IF 2.8
Ji Xiaohong,Ji Wenhui,Pourhashem Sepideh,Wang Wei,Duan Jizhou,Hou Baorong
Core-shell nanofibers consisted of chitosan/polyvinyl alcohol as shell and TiO 2 /Ag nanoparticles as core (abbreviated as (TiO 2 @AgNPs)@(CS/PVA)) are synthesized by electrospinning method for improving the functional properties of the epoxy polymer coatings. The agglomeration of the core-shell network is prevented through fabrication on carbon steel surface. Meanwhile, the presence of unique amine and hydroxyl functional groups on the surface of the CS/PVA nanofibers would provide a crosslinking with the epoxy resin molecules with merits of reducing the gaps between epoxy coating and fillers and enhancing the blocking effect of the fibers. The electrochemical impedance spectroscopy reveals that the resistance of the epoxy coating loaded with the core-shell nanofibers is almost 3 times more than that of the blank sample during 30 days of soaking in the 3.5 wt% NaCl electrolyte. Moreover, the (TiO 2 @AgNPs)@(CS/PVA)/epoxy coating has shown high antibacterial activity against S. aureus with the highest antibacterial rate of 87% after 24 h storage in the solution of phosphate buffer salt. The developed core-shell nanofibers embedded within epoxy coating with enhanced anticorrosion and antibacterial properties could provide a promising application in various maritime fields for achieving both anticorrosion and antifouling properties in one coating system.
研究领域:
材料科学
·
化学工程
·
生物学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 26
·1-16
·
IF 2.8
Wei Qian,Zheng Meng
Microplastics (MPs) pose significant environmental and health risks, and conventional disposal methods often suffer from inefficiency and potential ecological harm. Photocatalytic degradation has emerged as a promising solution. However, traditional TiO 2 -based photocatalysts are limited by high electron–hole recombination rates, narrow visible light absorption, and poor reusability. In this study, we develop and optimize a Fe 3 O 4 @TiO 2 /Ag nanocomposite for the efficient degradation of polyethylene (PE) MPs with facile recovery. The synergistic integration of Fe 3 O 4 and Ag with TiO 2 enhances visible light absorption and mitigates charge carrier recombination. Notably, the Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits a degradation efficiency of 15.54%, outperforming Fe 3 O 4 @TiO 2 (12.63%) and pristine TiO 2 (1.15%). Moreover, the composite maintains its performance over five consecutive cycles, underscoring its durability. The degradation efficiency of Fe 3 O 4 @TiO 2 /Ag was further optimized using response surface methodology. Overall, the developed Fe 3 O 4 @TiO 2 /Ag nanocomposite exhibits excellent photocatalytic efficiency, magnetic recoverability, and long-term stability, highlighting its potential for practical applications in mitigating microplastic pollution.
研究领域:
环境科学
·
材料工程
·
纳米技术
·
化学工程
·
污染控制
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2013
·
IF 2.562
Qinhui Chen,Longhui Zheng,Baoling Chen,Jinhuo Lin
Janus particles possess heterogeneous surface chemistries which can potentially enhance their interfacial activity and be exploited as useful catalysis agent. It is challenging to control the geometry of the Janus particles and to produce Janus particles in large quantities. In this report, we use a general approach of emulsion swelling assisted protrusion to synthesize the Janus composite particles of titania – poly (vinylbenzyl chloride-divinylbenzene) (TiO 2 -poly (VBC–DVB)). The size of the lobe of poly (VBC–DVB) is tunable. After a series of reactions, including Kornblum oxidation reaction and Tollens’ reaction, the target product of TiO 2 –Ag Janus composite particles is obtained.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Fengquan Gao,Yong Yang,Tianhe Wang
TiO 2 /Ag nanostructured porous films were prepared by spin coating of P25 TiO 2 /colloidal silica on glass substrate and subsequent photochemical deposition of silver nanoparticles (AgNPs). The adhesion strength of the film on glass substrate was evaluated and the result indicated that porous films formed on the glass substrates were robust and durable. The porous structure of TiO 2 /SiO 2 film facilitated the implantation of uniformly dispersed AgNPs having sizes generally less than 10 nm. By acting as electron scavengers, AgNPs effectively provided an alternative electron transfer route, thus enhancing the photocatalytic efficiency for degradation of methylene blue (MB). Compared with the bare TiO 2 film derived from P25, TiO 2 /Ag porous films showed an improved photocatalytic activity. This conclusion was further supported by photocurrent density measurements on the films. The study also demonstrated experimentally that TiO 2 /Ag porous films had sustained stability with the photocatalysis maintaining its original activity after at least four consecutive reaction cycles.
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高影响因子
APPLIED SURFACE SCIENCE
·
2012
·
IF 2.103
Fajia Liu,Hu Liu,Xiaoyun Li,Huanyu Zhao,Danping Zhu,Yingying Zheng,Chaorong Li
The antibacterial and photocatalytic PVC film was prepared by doping heteronanostructure of TiO 2 nanowire@Ag nanoparticles. TiO 2 nanowire with 50–60 nm in diameter and 0.1 mm in length was prepared by a hydrothermal method, and Ag nanopartical about 5–10 nm in diameter was grafted on the surface of TiO 2 nanowire evenly in the solution. The antimicrobial ability and the photocatalytic properties of the nano-TiO 2 @Ag/PVC film were systematically investigated by changing the influence factors such as the content of nano-TiO 2 @Ag, pH value and the cultivation condition. It confirmed that the nano-TiO 2 @Ag nanostructure could increase the antibacterial efficiency of the PVC film. Further, nano-TiO 2 @Ag/PVC film also showed enhanced photocatalytic activity to decompose Rhodmine B (RhB).
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
Lei Wang,Jafar Ali,Changbo Zhang,Gilles Mailhot,Gang Pan
High throughput of polyacylonitile (PAN)-based Ag/TiO 2 composite nanofibers were prepared by using needleless electrospinning method. The morphology and crystallinity characterization revealed uniform and smooth nanofibers with an average diameter ranged from 160 to 260 nm. The enhanced photocatalytic activity of PAN/Ag/TiO 2 compared with PAN/TiO 2 nanofibers under visible light irradiation was linked with high interfacial charge transfer and low bandgap due to Ag entity. High photodegradation efficiency for methyl orange, rhodamine B and methylene blue were achieved as 99.5%, 92% and 99% respectively during the 4 h experiment. Effect of key parameters (i.e. pH, oxygen and Ag/TiO 2 loading dosage) on photodegradation efficiency of dyes were also investigated. Active species trapping experiments demonstrated that O 2 − and OH were dominant active species in the photocatalytic degradation of dyes. These composite nanofibers have also exhibited excellent antibacterial activity, e.g. 95% of E. coli and 99% of S. aureus were killed in 2 h. Bifunctional nanofibers can be easily recovered from the aqueous solution as compared with the TiO 2 nanoparticles. Moreover, the daily production rate of nanofibers has reached over 1.4 kg in the laboratory test, which is 60 times higher than that using the single needle electrospinning method. This production rate may be further optimized in the pilot scale studies. High productivity and strong catalytic properties of nanofibers propose their potential applications in environmental remediation for economically and eco-friendly wastewater and air treatment materials.
研究领域:
环境科学
·
材料科学
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DOI
Gels
·
2026
·Vol. 12
·期 10
·858
·
IF 6.4
Gang Wang,Yu Wang,Yi Yang,Zhihua Cheng,Rong Liu,Lina Chang,Guangyu Zhang,Jiamu Dai,Du Nie,Chuanfeng Zang
Recoverable photocatalysts with broad optical response are of interest for practical water treatment. A 5,10,15,20-tetrakis(4-hydroxyphenyl)porphyrin (THPP)/TiO2/Ag composite was prepared hydrothermally and immobilized on activated carbon fiber (ACF) aerogel by silane-assisted dip coating. The design combined potential THPP photosensitization and Ag-mediated interfacial effects with TiO2photocatalytic sites and an adsorptive, recoverable ACF support. Structural and spectroscopic characterization supported incorporation of the components and changes in optical response and emission behavior. Overall apparent methylene blue removal reached 88.7% under UV irradiation and 88.0% under xenon-lamp irradiation. The concentration profiles were approximately fitted using an apparent pseudo-first-order model. Increasing the number of immersion cycles did not further improve the photocatalytic performance. These results demonstrate adsorption-assisted dye removal using an immobilized multiphase composite. The proposed charge-transfer pathway is presented as a mechanistic interpretation rather than a directly established electronic configuration.
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高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 28
·14642-14650
·
IF 7.443
Yongmei Ma,Honglin Liu,Zhenzhen Han,Liangbao Yang,Jinhuai Liu
An effective near-infrared (NIR) active photocatalyst, NaYF4:Yb,Tm@TiO2/Ag (UC@TiO2/Ag) core@comby shell composite, was synthesized by a simple three-step hydrothermal process. Under the full-spectrum light of a Xe lamp in UV-Vis absorbance experiments, about 96% of R6G dyes in solution were degraded by UC@TiO2/Ag in 120 minutes, while only about 64% of the dyes were degraded by pure TiO2 under the same conditions. Under a UV-filtered Xe lamp, about 35% of the dyes were degraded by UC@TiO2/Ag in 120 minutes; interestingly, only about 8% of the dyes were degraded by pure TiO2. Under irradiation by a 785 nm laser in surface enhanced Raman scattering (SERS) experiments, the photodegradation rate constants were 0.02612 s−1 for UC@TiO2/Ag and 0.00046 s−1 for TiO2/Ag, indicating a nearly 58 fold improvement. After deducting the photobleaching effect, the photodegradation rate constants for UC@TiO2/Ag under 633 and 532 nm lasers were 0.00715 s−1 and 0.00565 s−1, respectively, revealing a sharp decrease under irradiation at shorter wavelengths. Electron spin resonance (ESR) analysis revealed that the presence of UC in this photocatalytic system certainly induced the increase of ˙OH free radicals with NIR irradiation, i.e. the UC core converts NIR light into ultraviolet (UV) light and initiates excellent photocatalytic activity of the TiO2/Ag comby shell. Furthermore, the decorating of Ag nanoparticles not only enhances the photocatalytic ability, but also provides a structural basis for monitoring the photocatalytic kinetics by the SERS technique. By virtue of monochrome laser lines, SERS analysis provides direct evidence to prove the capability of UC-initiated non-UV photocatalysis and the improvement of the utilization of non-UV lights on TiO2. The results revealed that this new photocatalytic platform can efficiently utilize different bands of the solar spectrum and also find new applications in SERS fields.
研究领域:
材料科学
·
光催化
·
纳米技术
·
光谱学
·
环境化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Xiang Lv,Fengquan Gao,Yong Yang,Tianhe Wang
We report a simple but novel technique to prepare chemically durable TiO2/Ag films on FTO substrates via coating of P25 TiO2 with colloidal silica as a high temperature binder and subsequent electrochemical deposition of silver nanoparticles (AgNPs). The porous nanostructure facilitated implantation of AgNPs by electrochemical deposition. Extensive measurements on photocatalytic activities of the films prepared under varied conditions showed that TiO2/Ag enhanced MB degradation. Possible mechanisms of such enhancement were discussed in terms of delayed recombination of photogenerated electrons/holes via Schottky barriers and beneficial effects of Surface Plasmon. Experimental results of both electrochemical impedance spectra and transient photocurrent responses on the films supported the observed photocatalytic enhancement by TiO2/Ag heterostructures. The study offers an effective technique to implant uniformly dispersed AgNPs around 3 nm in size within a porous structure and may also provide a strategy for preparations of other functional films on FTO substrates.
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高影响因子
THIN SOLID FILMS
·
2024
·
IF 2
Tran Dung Hoang,Thuy Chinh Nguyen,Thanh Tung Doan,Thanh Dung Ngo,Thi Yen Nguyen,Ba Thanh Ngo,Thanh Thuy Tran,Trong Lu Le
Polyvinyl alcohol (PVA) is a widely used polymer in the electrospinning technique. It is water-soluble, which limits the application of electrospun PVA matrix. In this study, chitosan (CS) and biosynthesized TiO 2 @Ag nanoparticles were incorporated into PVA to enhance its antibacterial properties and photocatalysis. The PVA/CS/TiO 2 @Ag nanofiber mat was prepared using the electrospinning method with a voltage of 20 kV, a needle-collector distance of 15 cm, and a flow rate of 0.5 mL. h − 1 . The concentrations of the PVA and CS solutions were 10% and 2%, respectively. The TiO 2 @Ag nanoparticles were synthesized using AgNO 3 solution, TiO 2 nanoparticles as precursors, and Cleistocalyx operculatus leaf extract as a reducing agent. The morphology and structure of the PVA/CS/TiO 2 @Ag nanofiber mat were analyzed using scanning electron microscopy and infrared spectroscopy. The PVA/CS/TiO 2 @Ag nanofibers exhibited an average fibril diameter of 116.4 nm. Additionally, the antibacterial activity against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ), as well as the photocatalytic properties of these mats, were assessed. The results indicated that the addition of CS and TiO 2 @Ag led to changes in the hydrophilic properties and antibacterial efficacy of PVA. The inhibition zones of the PVA/CS/TiO 2 @Ag nanofiber mat against E. coli and S. aureus were measured at 5 and 4 mm, respectively. The water contact angle of PVA/CS/TiO 2 @Ag nanofiber mat showed a significant increase. The PVA/CS/TiO 2 @Ag nanofibers were able to degrade 94.56 ± 0.57% and 98.17 ± 0.11% of methylene blue dye under sunlight irradiation after 10 and 20 min of exposure, respectively. These findings suggest that the PVA/CS/TiO 2 @Ag nanofiber mat has the potential for applications in the textile industry or medicinal field as antibacterial and photocatalytic coatings.
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高影响因子
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