Catalysis Science & Technology
·
2017
·Vol. 7
·期 10
·2129-2139
·
IF 5.773
Houlin Wang,Shuang Liu,Zhen Zhao,Xin Zou,Minghan Liu,Wei Liu,Xiaodong Wu,Duan Weng
Different Ag/CeO2 catalysts with uniform structures and diverse surface oxygen vacancy (VO-s) contents were synthesized via a modified solution combustion method. Based on the results of Raman spectroscopy, H2-TPR and isothermal soot oxidation, it was suggested that even with gaseous O2 participating in the reaction, ceria surface sites around the catalyst–soot contact points can still be reduced by soot gradually. This interfacial reduction led to the generation of extra VO-s without changing the oxygen vacancies in the bulk of CeO2. Notably, this VO-s dynamic change and the insufficient O2− regeneration/delivery further resulted in the activation and deactivation of Ag/CeO2 during reaction with soot. This means that both the existence of ceria VO-s and its dynamic change during reaction may have a crucial influence on catalyst behavior. By further exploring these activity variations, the VO-s content, catalyst–soot contact condition and extra oxygen supplier were proved to be the three most important structural factors behind the soot oxidation activity of all the ceria-based catalysts. In this sense, Ag/CeO2 catalysts with appropriate morphology and moderate initial VO-s content may exhibit good activity for soot oxidation.
研究领域:
催化化学
·
环境科学
·
材料科学
·
表面化学
·
能源化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Long Wu,Weimin Zhang,Chen Liu,Mohamed F. Foda,Yongheng Zhu
In this work, based on the strawberry-like SiO 2 /Ag nanocomposites (SANC) immersed filter paper, a newly surface-enhanced Raman scattering (SERS) substrate was constructed for the detection of acrylamide (AAm) in food products. To construct filter paper-based SANC (F-SANC) SERS substrates, SiO 2 nanoparticles (SNP) were firstly synthesized and acted as carriers. After that, the in-situ preparation of silver nanoparticles (Ag NP) on SNP surface was carried out to form the strawberry-like three-dimensional (3D) structure of SANC. Finally, SANC were entangled into the filter paper to produce nanoarchitecture, thus providing enhanced plasmon resonance between SANC with strong SERS signal. Under the optimized conditions, the method exhibited good performance toward AAm with a vast linear response from 0.1 nM to 50 μM (R = 0.9935), limit of detection (LOD) of 0.02 nM (S/N = 3), and the recoveries of 80.5%~105.6% for practical samples. This strategy showed good robustness in the rapid and sensitive detection of AAm, which could be a promising strategy in food analysis and verification.
研究领域:
食品科学
·
分析化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yingze Cao,Weifeng Zhang,Bingyang Li,Pengfei Wang,Lin Feng,Yen Wei
In this study, a multifunctional material for highly efficient oil/water separation and catalytic reduction has been fabricated via a facile two-step immersion method. Firstly, PVA sponge was coated with polydopamine and polyethylenepolyamine codeposition films, and then Ag nanoparticle was reduced and anchored on sponge. The as-prepared [email protected] /PEPA sponge exhibits superhydrophilic/underwater superoleophobic wettability and the Ag nanoparticles on the sponge possess catalytic performance. The composite materials can simultaneously achieve has been significantly promoting and decomposition of water-miscible contaminants as the water pass through the sponge in a short time. The separation efficiencies of various oil/water mixtures are above 99.9% in a single unit operation with high fluxes, and 4-nitrophenol can be effectively reduced while the water pass through the modified sponge. The multifunctional composite sponge allows continuous treatment of polluted oily wastewater and has broad potential in purification engineering.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Junlei Zhang,Zhen Ma
Ag-Ag 3 VO 4 /AgIO 3 composites composed of Ag-Ag 3 VO 4 particles (major component) and AgIO 3 nanosheets (minor component) were obtained via photoreduction of Ag 3 VO 4 /AgIO 3 composites prepared by sequential precipitation. The optimal Ag-Ag 3 VO 4 /AgIO 3 catalysts (in particular, the one with an AgIO 3 /Ag 3 VO 4 mass ratio of 6.4%) were found to be more active than AgIO 3 , Ag 3 VO 4 , and Ag-Ag 3 VO 4 in the photocatalytic degradation of rhodamine B (RhB), methylene blue (MB), methyl orange (MO), and tetracycline hydrochloride (TC) under visible-light irradiation. Ag-Ag 3 VO 4 /AgIO 3 can be reused in cycling experiments. Photogenerated holes (h + ) and superoxide radical anions ( O 2 − ) were demonstrated by radical-capture experiments as the main active species in the photocatalytic degradation of RhB. The more efficient separation and transfer of photogenerated electron-hole pairs are responsible for the enhanced activity of Ag-Ag 3 VO 4 /AgIO 3 . A possible photocatalytic mechanism is proposed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
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.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Feihu Mu,Chunxia Liu,Yun Xie,Shijian Zhou,Benlin Dai,Dehua Xia,Haibao Huang,Wei Zhao,Cheng Sun,Yan Kong,Dennis Y.C. Leung
A novel metal–organic framework (MOF)-derived rodlike AgCl/Ag/In 2 O 3 plasmonic photocatalyst has been successfully prepared by electrostatic self-assembly, co-precipitation, in-situ photoreduction, and calcination. The photocatalytic activity of the samples was systematically investigated by photocatalytic tetracycline (TC) oxidation and Cr(VI) reduction under visible light irradiation. Among the as-prepared samples, AgCl/Ag/In 2 O 3 -2 displayed the most effective photocatalytic activity. For photocatalytic TC oxidation, the apparent rate constant of AgCl/Ag/In 2 O 3 -2 was 0.5036 min −1 , which was 2.7, 6.5, and 1.8 times higher than that of In 2 O 3 (0.1845 min −1 ), AgCl/In 2 O 3 (0.1544 min −1 ) and Ag/In 2 O 3 (0.2850 min −1 ), respectively. In addition, AgCl/Ag/In 2 O 3 -2 also exhibited the highest activity for photocatalytic Cr(VI) reduction, and the photocatalytic Cr(VI) reduction rate of AgCl/Ag/In 2 O 3 -2 in 3hrs could reach 94.8%. The superior photocatalytic activity was due to the enhanced absorption in the visible light region caused by localized surface plasmon resonance (LSPR) and the efficient interfacial charge migration and separation in AgCl/Ag/In 2 O 3 samples. Moreover, the intermediates formed in the photocatalytic TC oxidation were identified by GC–MS. Finally, a series of characterizations and simulations (density functional theory, cambridge serial total energy package, and finite difference time domain) were carried out to demonstrate the plasmonic Z-scheme photocatalytic mechanism.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 44
·e2307320120
·
IF 11.1
Yangyang Yu,Ye He,Ping Yan,Shengyao Wang,Fan Dong
The selective photocatalytic conversion of CO2 and H2O to high value-added C2H4 remains a great challenge, mainly attributed to the difficulties in C–C coupling of reaction intermediates and desorption of C2H4* intermediates from the catalyst surface. These two key issues can be simultaneously overcome by alloying Ag with Cu which gives enhanced activity to both reactions. Herein, we developed a facile stepwise photodeposition strategy to load Cu–Ag alloy sub-nanoclusters (ASNCs) on TiO2 for CO2 photoreduction to produce C2H4. The optimized catalyst exhibits a record-high C2H4 formation rate (1110.6 ± 82.5 μmol g−1 h−1) with selectivity of 49.1 ± 1.9%, which is an order-of-magnitude enhancement relative to current work for C2H4 photosynthesis. The in situ FT-IR spectra combined with DFT calculations reveal the synergistic effect of Cu and Ag in Cu–Ag ASNCs, which enable an excellent C–C coupling capability like Ag and promoted C2H4* desorption property like Cu, thus advancing the selective and efficient production of C2H4. The present work provides a deeper understanding on cluster chemistry and C–C coupling mechanism for CO2 reduction on ASNCs and develops a feasible strategy for photoreduction CO2 to C2 fuels or industrial feedstocks.
研究领域:
化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Liang-Liang Wu,Li-Ying Wang,Zheng-Jun Xie,Na Pan,Chi-Fang Peng
This paper reported that the peroxidase-like activity of DNA-Ag/Pt nanoclusters (NCs) can be inhibited significantly by l -cysteine. Based on this finding, a highly sensitive and selective colorimetric detection for l -cysteine was developed with a detection limit (LOD) of 2.0 nM and a linear range from 5.0 nM to 500 nM. This detection for l -cysteine was highly selectivity over other amino acids . The high sensitivity and selectivity of this method facilitated the detection of l -cysteine in biological samples. Moreover, this method developed here was low-cost and simple. These results indicated the excellent analytical application of Ag/Pt NCs as enzyme mimic .
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Zhou Shiqiang,Chen Mingpeng,Lu Qingjie,Zhang Yumin,Zhang Jin,Li Bo,Wei Haitang,Hu Jicu,Wang Huapeng,Liu Qingju
Formaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In 2 O 3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In 2 O 3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In 2 O 3 exhibits a sluggish response (R a /R g = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In 2 O 3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In 2 O 3 nanograin, greatly enhancing the selectivity and sensitivity.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Yao Yao,Mingli Yin,Junqing Yan,Dong Yang,Shengzhong (Frank) Liu
Ag-WO 3 core-shell nanospheres (CSNSs) are fabricated for gas sensor applications. It is found that the sensor based on Ag-WO 3 CSNSs dramatically improve the sensor performance towards alcohol vapor, with significantly lower optimum working temperature (260 °C) and superior detection limit (0.20 ppm) comparing to pure WO 3 hollow nanospheres (HNSs). The Ag-WO 3 sensor displays an ultrahigh sensitivity under visible light illumination. When illuminated under a 150 W xenon arc light source, the response is increased from 62 to 160, the optimum working temperature is reduced from 260 to 190 °C, and the detection limit is improved from 0.20 to 0.032 ppm. This work may offer an attractive strategy to improve sensitivity of light-enhanced plasmonic metal-oxide based gas sensors.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2016
·
IF 4.219
Zhong Lu,Jingting Gao,Qingfeng He,Jie Wu,Donghui Liang,Hao Yang,Rong Chen
Nano Ag/ZnO hybrid material has been considered to be a promising nanocomposites for biomedical application because it has enhanced antibacterial activity and low cytotoxicity. Here a sponge-like nano Ag/ZnO-loaded chitosan composite dressing was first synthesized via preparing a chitosan sponge by lyophilization process, followed by the incorporation of Ag/ZnO nanocomposites into chitosan sponge. The porosity, swelling, blood clotting and in vitro antibacterial activity against drug-sensitive and drug-resistant pathogenic bacteria were evaluated. The results demonstrate that the prepared composite dressing shows high porosity and swelling as well as enhanced blood clotting and antibacterial activity. Cytocompatibility test evaluated in vitro illustrates the very low toxic nature of the composite dressing. Furthermore, the in vivo evaluation in mice reveals that the chitosan-Ag/ZnO composite dressing enhances the wound healing and promotes re-epithelialization and collagen deposition. These results strongly support the possibility of using this novel chitosan-AgZnO composite dressing for wound care application.
研究领域:
生物医学工程
·
材料科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2018
·
IF 3.463
Kun Liu,Tao Qin,Yongbin Sun,Chao Hou,Xiaoqun Cao,Shoujun Jiang
Ag 2 Mn 5 /SiC catalyst is simply obtained by in-situ reaction-induced of their corresponding nitrate compounds onto SiC support, which exhibits excellent catalytic activity and stability in the gas phase oxidation of alcohols (94% conversion of benzyl alcohol and 98% selectivity of benzaldehyde). The catalytic activity could maintain at least 300 h after four regenerations due to the formation of highly active Ag 0 -Mn 3 O 4 species. XRD and XPS indicate that active Ag 0 -Mn 3 O 4 species is formed from Ag 2 O and MnO 2 in the reaction conditions. The synergistic effect between 34 nm Ag nanoparticles and 5.5 nm Mn 3 O 4 nanoparticles in alcohol oxidation reaction is prominent, which is testified by HRTEM and three-step experiment.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）