JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2021
·Vol. 36
·期 3
·303-310
·
IF 0.957
Dai Jinhang,Meng Shunliang,Yang Chuntian,Lü Wenzhong,Chen Xizi,Yin Yuhao,Liang Fei
To get a dielectric material with a high dielectric permittivity and suppressed dielectric loss, nano-Ag with a particle size of 20 nm and Ag@TiO 2 core-shell particles with diameters of approximately 70–120 nm were embedded in polyvinylidene fluoride (PVDF) to fabricate nano-Ag/Ag@TiO 2 /PVDF composites. After being modified by nano-Ag with 3 vol% optimal amount, the relative permittivity ( ε r ) at 100 Hz of 50 vol% Ag@TiO 2 /PVDF composites was 61, and the dielectric loss can be suppressed to 0.04, almost 96.4% lower than that of unmodified composites, and a higher frequency stability of both ε r and loss has also been found. The underlying mechanism of the reduced loss was attributed to Maxwell-Wagner polarization and the Coulomb blockade effect caused by the introduction of a small amount of nano-Ag, which will block the movement of electrons between metal nanoparticles and composites. The space charge polarization and conductance loss are weakened at lower and higher Ag@TiO 2 filling ratios, respectively, thus leading to a very low loss of the composites.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2017
·Vol. 93
·期 3
·761-775
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IF 3.135
Qi Chen,Zongxue Yu,Fei Li,Yang Yang,Yang Pan,Yixin Peng,Xi Yang,Guangyong Zeng
BACKGROUND Membrane separation is a promising process for treatment of dye and oily wastewater if the antifouling capacity and recyclability can be improved. In recent years, the development of photocatalytic materials has provided new methods for research into membrane technology. RESULTS In this study, a novel photocatalytic membrane decorated with RGO-Ag-TiO 2 nanomaterial was fabricated by simple vacuum filtration for degradation of dye and separation of oil–water. First, TiO 2 nanowires were prepared for more effective photocatalysis, reduced graphene oxide (RGO)-Ag-TiO 2 was fabricated by a facile hydrothermal reaction, then it was directly decorated on cellulose acetate (CA) membrane using polyethylene glycol and glutaraldehyde. CONCLUSION The as-prepared photocatalytic membrane can simultaneously degrade dye and separate oil–water emulsions under visible-light irradiation in a short time. The membrane has extremely high water flux (191 L m -2 h -1 ) and rejection rates (almost 100%) of dye–oil–water emulsion. More importantly, the photocatalytic membrane shows excellent antifouling capacity and recyclability, and retains relatively stable dye–oil–water permeation flux (about 27.5 L m -2 h -1 ) and high rejection rates (up to 99%) after six cycles of experiments under visible-light irradiation. Overall, the photocatalytic membrane opens up new avenues for the treatment of wastewater. © 2017 Society of Chemical Industry
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
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Jiwen Li,Yaqian Duan,Linlin Wang,Jingjun Ma
The poor light absorption and low carrier separation efficiency of Titanium dioxide (TiO 2 ) limit its further application. The introduction of plasma metal Ag have the potential to solve these drawbacks owing to its plasma resonance effect. Thus core-shell structure Ag@TiO 2 plasma photocatalysts was prepared by using facile reduction method in this work. More specifically, Ag@TiO 2 composite catalysts with different Ag loading amounts were prepared in the presence of surfactant PVP. Ag@TiO 2 demonstrates excellent light absorption performance and photoelectric separation efficiency compared with pure TiO 2 . As a result, it displays excellent performance of Cr(VI) reduction under visible light. The optimal composite catalysts Ag@TiO 2 –5P achieves exceptional visible-light-driven photocatalytic Cr(VI) reduction efficiency of 0.01416 min −1 that is 2.29 times greater than pure TiO 2 . To investigate the role of PVP, we also synthesized Ag@TiO 2 -5 without PVP. The experimental results show that although Ag@TiO 2 -5 Cr(VI) reduction performance is superior to pure TiO 2 , it significantly decreases compared with Ag@TiO 2 –5P. The results of TEM and optoelectronic testing show that agglomeration of Ag particles leads to a decrease in the photoelectric separation efficiency of Ag@TiO 2 -5. The smaller Ag particles provide more active sites and demonstrating a stronger overall local surface plasmon resonance (LSPR) effect. DMPO spin-trapping ESR spectra testing indicates that ∙O 2 − and ∙OH are the main reactive species. This research provides a potential strategy to prepare Ag-based plasma photocatalysts for environment protection.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2022
·
IF 6.267
Fengjuan Miao,Bingcheng Sun,Bairui Tao,Yanchun Wang,Paul K. Chu
In this paper, we demonstrate the application of a novel ternary nanocomposite MoS 2 /Ag/TiO 2 photoanode in high efficiency plasma dye sensitive solar cell (PDSSC). Ternary nanocomposites MoS 2 /Ag/TiO 2 was successfully synthesized by a simple solvothermal method without any hazardous substances. In order to achieve higher photoelectric conversion efficiency of DSSC, the photoanode’s ability of capturing light and electron transfer rates needs to be improved. Ag provides a power for light capture, while MoS 2 inhibits electron–hole recombination and promotes electron transport in the ternary nano-composite MoS 2 /Ag/TiO 2 . The nanocomposite was characterized by scanning electron microscope and transmission electronmicroscope, which indicated that the MoS 2 /Ag/TiO 2 was synthesized. Due to local surface plasmon resonance (LSPR), silver nanoparticles were doped onto TiO 2 nanoparticles, which greatly improved the optical parameters. The synthesis of Ag nanoparticles and MoS 2 was confirmed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The performance of dye sensitive solar cell (DSSC) composed of ternary nano-composite material MoS 2 /Ag/TiO 2 was tested, the photoelectric conversion efficiency (PCE) reaches 9.3%, which is 26% higher than that of pure TiO 2 nanoparticle photoanode.
研究领域:
材料科学
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能源科学
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光化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Zhengyi Zhang,Jiajie Yu,Jingying Yang,Xiang Lv,Tianhe Wang
Porous Ag/TiO 2 composite films were prepared by spin coating of titania on normal glass slides and subsequent photochemical deposition of silver nanoparticles (AgNPs). The films were characterized by XRD and FESEM to reveal micro structural and morphological differences between films obtained under varied conditions. The SERS properties of these films were investigated using aqueous crystal violet (CV) as probe molecules. The results indicate that the content of polyethylene glycol (PEG) and photo-reduction time had significant influences on both the microstructure and SERS performance of Ag/TiO 2 films. The highest SERS sensitivity that allowed as low as 10 −10 M aqueous CV to be detected, was achieved with the PEG/(C 4 H 9 O) 4 Ti molar ratio being 0.08% and with 30 min of UV irradiation. With this film a linear relationship was established through experiment between SERS intensity and CV concentration from 10 −10 to 10 −5 M, which could be used as a calibration curve for CV concentration measurement. In addition, the film could be reused as a SERS substrate for up to four times without significantly losing SERS sensitivity if a simple regeneration was followed. It is visualized that the Ag/TiO 2 film on glass has potentials for being developed into a practical SERS substrate with high sensitivity and good reusability.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 27
·期 7
·7025-7039
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IF 2.914
Gao Boru,Wang Jin,Dou Mengmeng,Xu Ce,Huang Xue
In present study, an efficient ternary Ag/TiO 2 /mesoporous g-C 3 N 4 (M-g-C 3 N 4 ) photocatalyst was successfully synthesized through depositing Ag nanoparticles (NPs) on the surface of TiO 2 /M-g-C 3 N 4 heterojunction. Ag/TiO 2 /M-g-C 3 N 4 nanocomposite displayed the highest degradation efficiency for amoxicillin (AMX) compared to TiO 2 /M-g-C 3 N 4 heterojunction, M-g-C 3 N 4 , and bulk-g-C 3 N 4 (B-g-C 3 N 4 ). The removal efficiency of AMX in real situation, surface water (SW), hospital wastewater (HW), and waste water treatment plant (WWTP) also were studied to illustrate the effectiveness of Ag/TiO 2 /M-g-C 3 N 4 photocatalysts. The vulnerable atoms in AMX structure were revealed through DFT calculation. Additionally, the dominating active groups produced in time of the photocatalytic procedure were determined on account of free radical trapping experiments and ESR spectra. The mechanism of photocatalytic degradation was proposed and verified. The transfer of the electrons and the inhibition of the recombination of photogenerated electron-holes were enhanced effectively under the synergistic effect of the Ag NPs and TiO 2 . As a consequence, the catalytic activity of the composite was improved under visible light.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Guoxiang Yang,Haibo Yin,Wenhua Liu,Yuping Yang,Quan Zou,Liulin Luo,Huiping Li,Yuning Huo,Hexing Li
The hybrid Ag/TiO 2 -N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag + ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO 2 -N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter baumannii was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of O 2 − radical, the synergistic effect of Ag nanoparticles and TiO 2 -N could induce the structure change of bacteria with the leakage of K + ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO 2 -N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO 2 -N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO 2 -N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
研究领域:
材料科学
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微生物学
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光催化技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xia Yang,Xin Qi,Guoqiang Ma,Zhaoyang Li,Qian Liu,Sara Khan,Yongjie Zhao,Leilei Zhang,Zhi Geng,Yingna Guo
Z -Scheme Ag/TiO 2 /AgMIL-101(Cr) was prepared by co-doping Ag and TiO 2 with AgMIL-101(Cr) via solvothermal synthesis combined with sol-gel method. Ag and anatase TiO 2 nanoparticles were well dispersed on the surface of AgMIL-101(Cr) with octahedral structure. 5 wt% Ag and 50% TiO 2 co-doping on the AgMIL-101(Cr) (Ag 5 T 50 Ag 5 M) exhibited large specific surface area (346.5 m 2 ·g −1 ) and narrow band gap 2.16 eV. Only 10 min of UV light irradiation resulted in the conversion of nitrate and nitrogen selectivity up to 100% over Ag 5 T 50 Ag 5 M. After 5 cycles of nitrate removal, the conversion of nitrate remained 90% indicating that catalyst had stable reusability. Moreover, instead of formic acid , ofloxacin (OFX) was used as a hole scavenger to evaluate the ability of Ag 5 T 50 Ag 5 M for the nitrate reduction. The result showed that the concentration of OFX was important factor to affect the conversion of nitrate. Based on the above discussion about the characterization and photocatalytic nitrate reduction, combined with the photoluminescence and electrochemical measurement results, the enhanced conversion of nitrate and nitrogen selectivity was reasonably explained. Finally, the route of electron transfer during the three constituents constructed Z -Scheme system and the mechanism of nitrate reduction to nitrogen was presumed.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Yongkang Shi,Yan Nie,Hualong Xu,Pengyu Bi,Boyang Chen,Xinyue Hou,Hongchao Ma,Meiwen Cao
Surface coating technology is an effective anti-corrosion strategy which can form a layer of anti-corrosion film on metal surface , effectively preventing it from oxidation and corrosion. Among various strategies, silanization treatment of metals is the most commonly used one. However, using silane-based coatings alone often leads to poor anti-corrosion performance due to insufficient mechanical strength and presence of surface defects . In order to improve the corrosion resistance of silane coatings, a hybrid surface coating has been constructed by introducing epoxy resin and Ag/TiO 2 nanoparticles into the silane film in this work. After adding epoxy resin, the thickness of the silane film greatly increases, which improves its mechanical properties . Ag/TiO 2 nanoparticles can enhance the cross-linking between silane molecules and epoxy resin, thereby preventing formation of surface defects. The epoxy resin-silane-Ag/TiO 2 composite surface coating is coated on the surface of AA2024 aluminum alloy using spin coating method. Electrochemical and salt spray tests indicate excellent corrosion resistance performance of the composite coating . This composite coating technology may have potential applications on the surfaces of various metal products such as medical devices and aerospace materials, and will shed light on the development of new surface coating technologies.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xinwei Zhang,Xiaotian Zhang,Rong Wang,Yijia Zhong,Kunting Li,Lei Xu,Huimin Feng
S-scheme heterojunction catalysts have attracted much attention due to their ability to effectively separate photo-generated electrons and holes while optimizing the redox ability of carriers. We have prepared an efficient visible-light catalytic PDPB/Ag–TiO 2 S-scheme heterojunction by in-situ synthesis methods . The catalysts were characterized for their structure, composition , morphology, and photoelectrochemical properties. The hydrogen production rate of PDPB/Ag–TiO 2 -2 was 1473.6 μmol/g/h. The results of SPV analysis showed that the spontaneous interfacial charge transfer from PDPB to Ag–TiO 2 in the contact interface region resulted in the presence of an internal electric field . This enhanced internal electric field effectively drove directional charge migration through the S-scheme mechanism, improving charge separation and utilization. The PDPB/Ag–TiO 2 -2 composites also maintained stable photocatalytic activity after running for four cycles. Overall, this study brings fresh preparation ideas for the conjugated polymer-TiO 2 composites with high photocatalytic efficiency.
研究领域:
材料科学
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能源化学
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光催化
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 14
·1-13
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IF 2.8
Hou Enhui,Kong Zhiguo,Wu Jianfeng,Wang Hairui,Nie Ping,Lu Ming,Chang Limin
Mxenes, a general term for a novel class of two-dimensional carbon–nitrogen compounds, which attracted extraordinary attention because of their unique electrochemical property. In this paper, an Ag-TiO 2 /MXene composite material was prepared for paraquat (PQ) detection by differential pulse voltammetry (DPV). It was found that the detection limit reached as low as 0.01 μM and linear range was from 0.05 to 15 μM (split into two sections: 0.05 to 1 μM and 1 μM to 15 μM). The Ag-TiO 2 /MXene composite electrode material exhibits excellent anti-interference properties to the species including the ions such as Cu 2+ , Na + , Ca 2+ , Zn 2+ , Cl − , SO 4 2− and biomass molecules such as glucose, ascorbic acid and uric acid. In the presence of organophosphorus pesticides, the electrode also showed good anti-interference. The excellent paraquat detection capability of the Ag–TiO 2 /MXene electrode material should be attributed to the synergistic effect obtained by decorating Ag and TiO 2 on MXene. In conclusion, the functionalization of MXenes through surface-modification provided a feasible route for ultrasensitive electrochemical sensors construction.
研究领域:
材料科学
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电化学
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环境监测
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Lianying Lu,Guohong Wang,Ziwei Xiong,Zifei Hu,Yuwei Liao,Juan Wang,Jun Li
A heterojunction of plasmonic Ag particles on Ti 3+ -doped macro-/meso-porous TiO 2 framework consisting of parallel microchannels, denoted as Ag/TiO 2- x , has been fabricated by a simple microwave-assisted process employing vitamin C as the reducing agent for forming TiO 2- x framework followed by photochemical deposition of Ag particles. Charge transport and recombination processes were detected through transient photocurrent responses. The visible-light photocatalytic hydrogen production rate and the apparent reaction rate constant of RhB photodegradation with 3%-Ag/TiO 2- x catalyst are about 5.3 and 14.0 fold higher than those with the pristine macro-/meso-porous TiO 2 framework, respectively. A mechanism based on the synergistic effects of Ag plasmonics and Ti 3+ -doping at the Ag/TiO 2- x heterojunction is proposed, which consistently explains the high photocatalytic performance in hydrogen evolution and the improved photocatalytic decomposition of RhB under visible light. This study demonstrates the effective route to synthesize new heterojunction photocatalytic materials with multifunctional properties using low-cost and rapid microwave processes.
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
危险品化学品经营许可证（带存储）