APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ling Zhang,Yiquan Xie,Yiwen Jiang,Yaobin Li,Chunying Wang,Shichao Han,Huimin Luan,Xiangju Meng,Feng-Shou Xiao
Catalytic combustion at low temperature has been considered as an effective route for removal of indoor HCHO pollutant, and conventional catalysts are supported noble metal nanoparticles, which are costly for wide applications. Solution of this issue is to use relatively low metal catalysts. Herein, we report that Mn-promoted Ag catalyst supported on pure silica Beta zeolite with a good hydrophobicity is very active for catalytic combustion of HCHO. By optimizing the loadings of Ag and Mn, it is found that 10 wt% Ag with 8 wt% Mn (10 %Ag8 %Mn/Beta-Si) exhibits highest activity, giving the complete HCHO conversion at around 45 °C, which steadily outperform the temperatures (70–145 °C) for full oxidation of HCHO reported previously. The choice of Ag loading with 10 wt.% is due to the highest exposed surface of Ag sites, and the use of Mn loading with 8 wt% is assigned to the balance of density and mobility for active oxygen species in the catalysts. The strategy combining the hydrophobic supports with optimized active oxygen species might offer an alternative way to develop highly efficient heterogeneous catalysts for the removal of air pollutants in the future.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2022
·
IF 3.51
Baohuai Zhao,Baofang Jin,Xiaodong Wu,Duan Weng,Rui Ran
A series of Sm-Mn oxides (SmMnO 3 , SmMn 2 O 5 and Sm 0.9 Ag 0.1 Mn 2 O 5 ) of perovskite-type and mullite crystal phases were synthesized for the catalytic oxidation of CO and C 3 H 8 . The Sm 0.9 Ag 0.1 Mn 2 O 5 composition showed the highest catalytic activity among the series of solids, especially for the CO oxidation to CO 2 with T 50 and T 90 values of 60 and 95 °C, respectively. The catalysts were characterized by powder XRD, Raman, BET, XPS, and H 2 -TPR. It was found that the catalytic performance of the solids was correlated well with their redox properties. Synergetic effects between Ag-related species and the mullite phase resulted in more active surface oxygen species and remarkably lowered the reduction temperature of the Sm 0.9 Ag 0.1 Mn 2 O 5 solid.
研究领域:
材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 12
·1524
·
IF 2.9
Jiayuan Yang,Jixing Cui,Haiping Zhang,Hui Zhang,Jesse Zhu
Antibacterial powder coatings have attracted increasing attention with the awakening of people’s health awareness. Silver antibacterial agent has been widely used in coating system due to its superior stability and durability. However, silver ions have the problems of excessive release rate and the tendency to cause yellowing of the coating film. The addition of Cu2+and Zn2+can effectively alleviate these two phenomena. In this paper, the ternary exchange kinetics of Ag+, Cu2+, and Zn2+were studied to provide a theoretical basis for the synthesis of LTA-Ag-Cu-Zn. The reaction kinetics study shows that the selectivity and the adsorption capacity of LTA to Ag+is higher than that of Cu2+and Zn2+. The thermodynamic analysis discovers that LTA has the highest selectivity for Ag+, and the exchange between the two is spontaneous. In contrast, the selectivity of LTA to Cu2+and Zn2+is concentration-dependent. By establishing the three-ion competitive adsorption curve, it is found that the selectivity of Ag+is the highest, and the selectivity of copper and zinc is similar. These trends result from Ag+ions’ low hydration energy, small hydration radius, and strong electronegativity. This research lays the groundwork for developing high-performance LTA-Ag-Cu-Zn tri-ion exchange antibacterial agents.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2024
·
IF 4.4
Chunlai Zhang,Yingdong Hao,Xingbo Wang,Deng Hu,Nannan Sun,Wei Wei
Photocatalysis is a highly promising strategy for the direct conversion of inert methane (CH4). In this study, a ZnO semiconductor with a nanorod morphology (r-ZnO) was synthesized using a template-directed hydrothermal method, which was further used to prepare nAg/r-ZnO photocatalysts through impregnation and reduction. The structure, composition, and microstructure of nAg/r-ZnO were characterized using techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and UV-visible absorption spectroscopy (UV-vis). The in-depth mechanism of the photocatalytic conversion of CH4 was revealed through electron paramagnetic resonance (EPR) and radical capture experiments. The results showed that the introduction of Ag species promoted the separation of photoinduced electron (e−) and hole (h+) pairs, which facilitated the generation of reactive oxygen species (ROS). Therefore, the performance of photocatalytic CH4 oxidation can be significantly enhanced. Interestingly, formaldehyde (HCHO) was generated as the primary product instead of low-value methanol (CH3OH). Through optimization of Ag loading and reaction conditions, an excellent oxygenate (CH3OOH, CH3OH, and HCHO) yield of 15 551.60 μmol g−1 h−1 with a high selectivity of 98.46% was achieved simultaneously, which has been rarely reported in previous studies.
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Yiting Liu,Wenjie Chen,Jie Yang,Ning Cai,Jumei Li
Exploring robust, sensitive and reliable surface-enhanced Raman spectroscopy (SERS) substrates largely depends on creating a high density of hot spots. Hererin, we present the fabrication of a unique core-satellite composite, consisting of sandwich Ag/MOF/Ag nanoshells, achieved by constructing two layers of dense Ag satellites with a MOF interlayer on PMAA nanospheres. These innovative sandwich Ag/MOF/Ag nanoshells create two distinct types of plasmonic nanogaps: the interstitial space between the Ag nanoshell layers and the internanogaps between adjacent Ag satellites. This structure significantly increases the number of hot spots compared to traditional core-monolayer metal satellites, leading to enhanced SERS activity. As expected, the composites exhibit an impressive enhancement factor of 3.85 × 10 6 and a low detection limit (LOD) of 10 −9 mol/L for methylene blue. The SERS sensing performance is further validated by successfully quantifying ciprofloxacin (CIP) and paraquat (PQ) in real milk samples with LODs of 3.28 × 10 −7 mol/L for CIP and 1.71 × 10 −8 mol/L for PQ, demonstrating strong potential for ultra-sensitive detection of hazardous pollutants in foods.
研究领域:
分析化学
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纳米技术
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食品安全
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光谱学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Yating Feng,Jiaxue Dai,Chuyun Wang,Hongyang Zhou,Jianhua Li,Gang Ni,Maofeng Zhang,Youju Huang
Perfluoro- and polyfluoroalkyl substances (PFAS) are widely used throughout the world and are extensively found in the environment. The detection of PFAS has become essential to ensuring environmental sustainability and human health. Herein, AuNRs were synthesized by the seed growth method and then the samples were coated with silver shells to form Au@Ag core–shell nanorods (Au@AgNRs). Au@AgNRs monolayer was prepared by oil–water self-assembly on a silicon wafer and then was constructed as a plasmonic AgNPs/Au@AgNRs sandwich structure for surface-enhanced Raman scattering (SERS) detection of PFAS. The shell thickness of Au@AgNRs was optimized and displayed a 11.9-fold SERS intensity higher than the pristine AuNRs. Moreover, the hotspots generated by the electromagnetic field coupling between the interlayer gap achieved 3.6-fold SERS signal enhancement compared to that of the Au@AgNRs monolayer. Besides, the excellent structural uniformity (RSD ∼ 8.0%) makes it ideal for quantitative SERS detection applications. More importantly, the use of the AgNPs/Au@AgNRs sandwich structure sensor enables the highly sensitive detection of model molecules (10–11 M) and quantitative detection of a wide range of fluorinated alkyl substances of perfluorooctanoic acid (PFOA), perfluorohexanoic acid (PFHxA), and potassium perfluorobutanesulfonate (PPFBS), even with a portable Raman device. And the detection concentration can be down to 0.1 ppm for PFAS. This sensitive and quantitative SERS technique has promising prospects in the monitoring of fluorinated alkyl substance contaminations.
研究领域:
环境科学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yingjie Niu,Ziqi Wang,Yuan Li,Bichan Huang,Teng Ma,Xuanbo Jiang,Hui Cheng,Kaifu Zhang,Chenglin Yi
Lightweight and ultra-thin conformal shielding films can be directly integrated on the surfaces of complex structures without occupying additional three-dimensional (3D) space, holding considerable promise for protecting sensitive precision electronic equipment. Here, titanium carbide/silver (MXene/Ag) nanocomposites were synthesized through electrostatic adsorption and in-situ self-reduction, and subsequently combined with Ag ink to create a MXene/Ag-Ag hybrid ink optimized for aerosol jet printing (AJP). The introduce of ethylene glycol based solvent system largely prevents the aggregation of aerosolized hybrid ink particles and reduce the overspray as well. This hybrid ink exhibited a printing resolution of ∼ 10 μm and excellent electrical stability, with only a 4.8 % increase in resistance of the printed trace after 1000 bending cycles. The internal pores and heterogeneous interfaces of MXene/Ag formed after sintering process significantly enhanced the electromagnetic wave absorption of the film. The specific electromagnetic interference (EMI) shielding effectiveness (SE) (SSE/t, defined as the ratio of EMI SE to the density and thickness) of the MXene/Ag-Ag film reaches 52591.4 dB·cm 2 /g at a thickness of merely 500 nm with only 0.9 mg weight increment. Simultaneously, the successful fabrication of high-quality conformal films on various complex substrates showcases the advanced manufacturing capabilities of AJP. Moreover, the utilization of the shielding film in practical applications, including electric field shielding, wireless charging, and near-field communication (NFC) interruption, highlights the potential of AJP technology for the fabrication of integrated conformal EMI shielding electronics with custom-designed structures.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 88
·期 3
·654-659
·
IF 1.745
Wang Lijuan,Lv Hua,Li Binjie,Zhao Yanbao,Sun Lei
Flower-like ceria (CeO 2 ) architectures consisting of well aligned nanosheets were first synthesized by a glycol solvothermal method. The size of CeO 2 architectures is about 5 μm in width and 10 μm in length, with the nanosheets thickness below 100 nm. Subsequently, the adsorbed Ag ions on the surface of CeO 2 were in situ reduced to form Ag nanoparticles (NPs), leading to the fabrication of Ag/CeO 2 hybrid architectures (HAs). The formed Ag NPs with sizes of 20–40 nm were uniformly loaded on the surface of the CeO 2 sheets. The antibacterial properties of Ag/CeO 2 HAs against Gram-negative E. coli and Gram-positive S. aureus were evaluated by minimum inhibitory concentration (MIC), minimum bactericidal concentration (MBC), and a filter paper inhibition zone method. The results demonstrated that Ag/CeO 2 HAs displayed excellent antibacterial activity toward S. aureus and E. coli , which were attributed to the synergistic antibacterial effect between Ag NPs and CeO 2 in HAs . Here, CeO 2 nanoflowers as a new substrate could restrict Ag NPs aggregations and improve their antibacterial activities. Therefore, the resulted Ag/CeO 2 HAs would be considered as a promising antibacterial agent.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 26
·4895-4902
·
IF 4.034
Changchao Jia,Hsueh-Shih Chen,Ping Yang
In this paper, TiO2 beads were deposited on Ag nanowires to create necklace-like Ag nanowire@TiO2 (Ag NW@TiO2) heterostructures for the first time. They were fabricated via a two-step synthetic method, including the preparation of uniform Ag NWs and the deposition of TiO2 on the Ag surface. Thioglycolic acid (TGA) molecules were used as binding agents to solve the tricky issue of substantial lattice mismatch between the Ag NW core and the TiO2 shell. The amount of water and the permittivity of the solvents are found to be important factors for the formation of the necklace-like heterostructures. Moreover, by varying the amount of titanium butoxide (TBT), the diameter of the TiO2 beads can be feasibly changed. The photocatalytic performance of necklace-like Ag NW@TiO2 was evaluated via degradation of methyl orange (MO) under ultraviolet (UV) light. The results reveal that the molar ratio of TiO2 to Ag contributes to the synergistic effect on the photocatalytic activity, and the best Ti/Ag ratio is found to be 2.8 for the highest photocatalytic performance of the Ag NW@TiO2 heterostructures.
研究领域:
材料科学
·
纳米技术
·
光催化
·
表面工程
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yang Yang,Mengyao Tan,Xiaoman Li,Min Luo
The photocatalytic nitrogen reduction reaction provides an alternative process for nitrogen cycling and ammonia (NH3) production under mild conditions. Herein, we have synthesized Ag-loaded In2O3 (Ag@In2O3-X) by solvothermal and photoreduction methods. The introduction of Ag significantly alters the band structure of In2O3, resulting in a slight reduction in the band gap and a more negative conduction band position, thereby facilitating the generation of reductive electrons in In2O3. Moreover, the synergistic interaction between loaded Ag nanoparticles and In2O3 forms a Schottky barrier, which widens the light absorption range and promotes charge separation. Under simulated sunlight, the photocatalytic nitrogen fixation performance of Ag@In2O3-5 reaches 35.56 μmol h−1 gcat−1, which is higher than other composites and 3.58 times that of pure In2O3. At the same time, the catalyst has good structural stability and cycle life. Density functional theory (DFT) calculations demonstrate that Ag exhibits a stronger interaction with N2 and lowers the potential barrier of the N2 hydrogenation reaction. The synergistic effect between precious metals and semiconductors offers novel insights and presents challenges for the photocatalytic N2 fixation process. This work provides new insights and challenges for designing and synthesizing nanomaterials for photocatalytic nitrogen fixation.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2025
·
IF 2.6
Yinkun Liao,Yibo Hu,Yuanhao Zhou,Jingkun Chen,Xue Yang,Meng Gu,Kuan Ren,Jingtai Zhao,Qianli Li,He Feng
Copper halide scintillation materials with self-trapped exciton (STE) photoluminescence have attracted great interest in the field of optoelectronics. However, it is challenging for Cs3Cu2Br5 materials to achieve wider spectral emission and high spatial resolution X-ray imaging in applications. Herein, combining XRD and energy dispersive spectroscopy results, it is proved that Ag+ is doped into the Cs3Cu2Br5 lattice through an ion doping process, and PL is regulated from 460 nm to 543 nm. By density functional theory calculation, the band gap is reduced from 2.25 eV of Cs3Cu2Br5 to 1.99 eV of Cs3Cu2Br5:Ag, which is also consistent with the spectral redshift. The gradient study of the silver ion concentration from 5% to 35% shows that the best silver ion concentration is 25%. The experimental results show that the doped silver ions can improve the PL, PLE, PLQY, XEL and other properties of the material, such as the PLQY which increased from 27.38% to 90.62%. At the same time, Cs3Cu2Br5:Ag also has good stability, it can be stored in air for 30 days, and its PL intensity remains at 90.73%. The X-ray space of the Cs3Cu2Br5:Ag-UV scintillation film measured in a laboratory imaging system can reach 18.3 lp mm−1.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Richuan Rao,Hanwen Liang,Chunming Hu,Huaze Dong,Xiongzi Dong,Yongqiang Tang,Song Fang,Qiang Ling
Ag-CeO 2 nanoassemblys are prepared with a simple melamine-induced thermal decomposition method. Ag-CeO 2 nanoassemblys have a structure composed of Ag nanoparticles and CeO 2 nanoparticles. For Ag-CeO 2 nanoassemblys, Ag introduction can partially or completely activate lattice oxygen species of CeO 2 nanoparticles and however, the ease of Ag-CeO 2 interface oxygen activation is strongly influenced by their pyrolysis temperature. Ag-CeO 2 nanoassemblys prepared at 350 °C have only partial activation of CeO 2 surface oxygen. If the calcination temperature increases to 400 °C, Ag-CeO 2 nanoassemblys are fully activated to form more reducible interfacial lattice oxygen and to promote their low-temperature reductivity. Although excessive calcination temperature (500 °C) induces full activation of Ag-CeO 2 interface lattice oxygen, Ag-CeO 2 nanoassemblys will construct a new Ag-CeO 2 interface that is relative difficult to reduce, causing a less amount of reducible interface lattice oxygen provided at higher temperature. Ag-CeO 2 nanoassemblys are investigated to reveal the relationship of Ag-CeO 2 interfacial oxygen activation and CO catalytic oxidation performance. Ag-CeO 2 nanoassemblys with more interfacial lattice oxygen provided at lower temperature are found to have higher catalytic activity than that catalyst with the partially or excessively activated interfacial oxygen.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）