JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Tiantian Yang,Zibo Dong,Inaam Ullah,Ayesha Irfan,Jun He,Jinhe Qi,Mai Li
Efficient interfacial carrier transfer and separation can effectively enhance the photocatalytic performance. Herein, a high-performance g-C 3 N 4 /Ag/BaTiO 3 heterostructure was constructed, which showed promising results in photocatalytic nitrogen fixation and tetracycline degradation. Specifically, Ag-modified tetragonal barium titanate (BaTiO 3 ) nanoparticles were combined with flower-like spherical graphitic carbon nitride (g-C 3 N 4 ) to prepare the g-C 3 N 4 /Ag/BaTiO 3 photocatalyst. The Ag nanoparticles were uniformly distributed on BaTiO 3 through photodeposition, which was subsequently loaded onto g-C 3 N 4 , offering abundant surface active sites and a large surface area for enhanced photocatalytic activity. Four types of composite photocatalysts were prepared. The 1:3-g-C 3 N 4 /Ag/BaTiO 3 photocatalytic composite, composed of g-C 3 N 4 and Ag/BaTiO 3 in a 1:3 ratio, achieved an impressive nitrogen fixation rate of 765.85 μmol g −1 h −1 , greatly exceeding that of pure g-C 3 N 4 and BaTiO 3 by factors of 2.14 and 3.88, respectively. Also 1:3-g-C 3 N 4 /Ag/BaTiO 3 had the highest tetracycline degradation rate of 82.7 %. It was found that the significant improvement of photocatalytic efficiency could be attributed to the ultrasonic vibration-induced piezoelectric polarization of BaTiO 3 , which generates an intrapolar electric field. Additionally, the noble metal Ag nanoparticles with surface plasmon resonance (SPR) effect can be used as electronic mediators to promote charge separation and transfer to form all-solid Z-type heterojunctions. This Z-type heterojunction effectively minimizes the recombination of photogenerated charge carriers of electrons and holes. Studies have shown that this composite photocatalyst exhibits excellent performance in both photocatalytic nitrogen fixation and the degradation of organic pollutants, highlighting the great potential of this composite heterojunction in photocatalysis.
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Molecular Catalysis
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2024
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IF 3.9
Menghan Guo,Jie Ding,Guojing Ji,Tian Xie,Huiwen Pang,Xiang Li,Qin Zhong
Ethyl glycolate (EGly) is a platform molecule in various fields, which has been widely applied for the production of various valuable chemicals. Despite being a traditional catalyst for the conversion of diethyl oxalate (DEO) to EGly, Ag/SiO 2 catalyst exhibits insufficient activity. The present study introduces a novel preparation method that couples H 2 O 2 reduction with deposition precipitation to augment the performance of the catalyst. Performance results show that Ag/SiO 2 catalyst prepared by the new method attains a DEO conversion of 95.6% and an EGly selectivity of 78.0%, showing respective improvements of 10.0 and 15.2% over excess impregnation-evaporating solvent method. Characterization results show that the average silver particles size of Ag/SiO 2 catalyst prepared by the new method is 6 nm, which is 1/2 of the excess impregnation-evaporation solvent method. Simultaneously, it contains a greater quantity of Ag 0 . The smaller and more uniform particles offer greater active site density, leading to enhanced DEO conversion. An increased presence of Ag 0 diminishes DEO overactivation and inhibits the dissociative adsorption of H 2 . Moreover, the amplified quantity of Ag 0 could be attributed to the reduced interfacial charge transport triggered by metal-support interactions (MSIs).
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
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IF 3.9
Jieying Su,Haitao Zhang,Yuanyuan Gong,Qinqin Xu,Maohua Hou,Bin Xu
To develop a material that can be applied in the field of thermoregulation materials for residential buildings and degradation of organic pollutants. A novel microencapsulated phase change material, paraffin@TiO 2 /Ag, was prepared using interfacial condensation technology. The paraffin@TiO 2 /Ag microcapsules' melting point and latent heat were 48.00 °C and 63.56 J/g, respectively, according to the DSC study results, and their encapsulation rate was 46.11 %. In addition, the experimental results of photocatalytic degradation of MB (methylene blue) showed that the paraffin@TiO 2 /Ag microcapsules had high photocatalytic activity for organic dyes under natural light, and the degradation rate of MB reached 99 % when the light exposure time reached 4 h. By comparing the reaction rate constant of MB by paraffin@TiO 2 microcapsules (0.98969 h −1 ) with that of MB by paraffin@TiO 2 /Ag microcapsules (1.15845 h −1 ), it was learned that the introduction of Ag nanoparticles effectively improved the photocatalytic activity of the phase change microcapsules.
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CHEMICAL ENGINEERING SCIENCE
·
2024
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IF 4.1
Yinhe Hai,Tong Guan,Yibin Feng,Ziheng Zhen,Youwei Yang,Ying Hu,Jing Lv,Yue Wang,Xinbin Ma
A promising route for producing biodegradable polyglycolic acid material from syngas has garnered increasing attentions. In this route, one of the pivotal issues is developing favorable catalysts for semi-hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG). Silver catalysts were reported to be effective but suffered from the high cost. Herein, we prepared small-sized Cu@Ag/SiO 2 catalysts with appropriate Ag/Cu ratios by a facile wet impregnation method. This core–shell structure facilitated the intermetallic electronic transference from Cu to Ag. The surface exposure of electron-rich silver species could promote the catalytic activity and MG desorption in the DMO hydrogenation, which achieved high efficiency without compromising the MG selectivity. The optimal catalyst with Ag/Cu mass ratio of 3/2 displayed excellent space time yield towards MG of 47.3 g·g Ag −1 ·h −1 . These insights could offer a potential strategy to reduce the silver-based catalyst cost for the semi-hydrogenation of DMO to MG.
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ACS Nano
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2025
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IF 16
Xiuling Guo,Chao Feng,Zihao Yang,Shingo Hasegawa,Ken Motokura,Yong Yang
Engineering the local coordination environment of single metal atoms is an effective strategy to improve their catalytic activity, selectivity, and stability. In this study, we develop an asymmetric Pd–Ag diatomic site on the surface of g-C3N4 for the selective electrocatalytic semihydrogenation of alkynes. The single Pd atom catalyst, which has a locally symmetric Pd coordination, was inactive for the semihydrogenation of phenylacetylene in a 1 M KOH and 1,4-dioxane solution at an applied potential of −1.3 V (vs RHE). In sharp contrast, doping Ag sites into single Pd atom catalyst to form paired Pd–Ag diatomic sites with asymmetric Pd coordination substantially enhanced the reaction, resulting in a high conversion (>98%) with exceptional time-independent selectivity to styrene under identical conditions. Characterization and theoretical calculations reveal that the introduction of a Ag site into single Pd atoms disrupts their symmetry coordination by forming Pd–Ag bonds with N2–Pd–Ag–N configuration, thereby modulating the electronic and geometric structures of Pd sites, which in turn benefits the adsorption and activation of substrate and lowers energy barrier for the rate-determining step of semihydrogenation, ultimately enhancing the electrocatalytic reaction. This work provides a facile and powerful strategy for the design of advanced catalysts by tuning the local coordination environment for selective catalysis.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Ye Zhang,Kai Yan,Yi Jiang,Sheng-Da Liu,Gui-Xia Liu
Aqueous zinc-ion batteries (AZIBs) offer advantages such as high specific capacity, affordability, and minimal assembly environment requirements, positioning them as a promising candidate for next-generation energy storage system. However, the performance of the AZIBs is greatly influenced by dendrite formation and side reactions occurring on the surface of the zinc metal anode. In this study, a high-stability Zn@Ag anode material was prepared using electron beam evaporation. The presence of Ag coating lowers the nucleation overpotential for Zn and encourages its preferential growth on the (002) crystal face, thereby inhibiting dendrite formation. The Zn@Ag symmetric battery exhibits outstanding performance in Zn deposition and stripping, achieving 2070 h at a current density of 1 mA cm −2 /1 mAh cm −2 . Additionally, it shows stable cycling for 1580 h even at a higher current of 5 mA cm −2 . Furthermore, the enhanced corrosion resistance and inhibition of hydrogen evolution reaction (HER) in Zn@Ag compared to bare Zn contribute to its superior stability. The full battery Zn@Ag||MnO 2 exhibits higher capacity and superior long-term cycling performance than Zn||MnO 2 . This approach offers a potential solution for optimizing design of Zn anodes in AZIBs.
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FOOD CHEMISTRY
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2024
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IF 8.5
Liming Guo,Jie Zhang,Ying Bao,Yi Zhang,Dexu Zhang,Xiangyu Ma,Jiadong Zhang
Aflatoxin B 1 (AFB 1 ), a pernicious constituent of the aflatoxin family, predominantly contaminates cereals, oils, and their derivatives. Acknowledged as a Class I carcinogen by the World Health Organization (WHO), the expeditious and quantitative discernment of AFB 1 remains imperative. This investigation delineates that aluminum ions can precipitate the coalescence of iodine-modified silver nanoparticles, thereby engendering hot spots conducive for label-free AFB 1 identification via Surface-Enhanced Raman Spectroscopy (SERS). This methodology manifests a remarkable limit of detection (LOD) at 0.47 fg/mL, surpassing the sensitivity thresholds of conventional survey techniques. Moreover, this method has good anti-interference ability, with a relative error of less than 10% and a relative standard deviation of less than 6% in quantitative results. Collectively, these findings illuminate the substantial application potential and viability of this approach in the quantitative analysis of AFB 1 , underpinning a significant advancement in food safety diagnostics.
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ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Yingying Huang,Sihang Zhang,Shouxiang Jiang,Jiangtao Xu
Flexible surface-enhanced Raman spectroscopy (SERS) substrates have garnered more and more attention due to their noninvasive sample collection ability. However, the improvement of SERS performance gradually reaches a bottleneck with numerous studies on exploration of active materials. In this study, we constructed an Ag@TiO2@cotton SERS substrate with randomly distributed TiO2 nanocavities, which can generate a strong coupling cavity mode, thus dramatically enhancing SERS activities. The prepared SERS substrates demonstrate high detection sensitivity, with a limit of 10–10 M for MB solution, an impressive enhancement factor (EF) of 2.7 × 108, excellent signal reproducibility, and remarkable stability. Furthermore, the proposed material allows the sensitive detection of MG with a limit of 1.0 × 10–10 M through a wiping fish collection method. These flexible Ag@TiO2@cotton substrates expand the range of available SERS substrates, and their easy fabrication method and long-term sensitivity hold promise for the trace analysis of harmful substances.
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CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Zhuoshi Li,Yinhe Hai,Yibin Feng,Tong Guan,Tiantian Xiao,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Methyl glycolate (MG) is an important building block for synthesizing biodegradable material of polyglycolic acid. Hydrogenation of coal-based dimethyl oxalate (DMO) to MG is quite promising, where Ag-based catalysts exhibited excellent selectivity. Here, a series of Ag/SiO 2 -x catalysts with particle sizes of 1.4–13.5 nm were prepared, which showed significant structural sensitivity in DMO hydrogenation. For Ag nanoparticles of 1.4–2.7 nm, the turnover frequency (TOF) was linearly increased with the surface electron density of silver, but when the Ag nanoparticles further enlarged, no significant variation of TOF was observed. Combining DFT calculation and experimental results of the model catalyst, triangular nanoplate, it was deduced that the Ag (1 1 1) played a dominant role in DMO hydrogenation to MG, originating from the benefited MG desorption as well as promoted dissociation of H 2 and DMO. This understanding about Ag particle size effect may provide guidance for designing efficient catalysts for DMO hydrogenation to MG.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Naiqiang Wang,Xiaoqing Si,Baiqi Zhang,Jianwei Gao,Mingsheng Li,Tong Lin,Rui Li,Chun Li,Junlei Qi,Jian Cao
A novel sintered-joining of Al 2 O 3 and AlN is achieved for the first time using micro-Ag particle interlayers in air. In comparison with reactive air brazing , this method addresses the issue of reduced strength caused by air holes in brazed joints . Also, this sintered-joining method can be performed at a lower temperature (920 °C), improving the joint strength by relieving the residual stresses. The sintering effect of micro-Ag particles and their high density of dislocations promote the recovery and recrystallization of the Ag interlayer, as well as the interdiffusion of Ag and ceramic. Ag–O clusters formed at the interface can be embedded into oxygen vacancies on the ceramic surface, playing a key role in interfacial joining. By optimizing joining temperature, assembly pressure and holding time, a maximum joint shear strength of 85.2 MPa is achieved at 920 °C for 30 min with an assembly pressure of 1 MPa. This study successfully prepares Al 2 O 3 /AlN joints with excellent mechanical properties, providing a reliable foundation for the fabrication of power integrated circuits with efficient operation.
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FOOD CHEMISTRY
·
2024
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IF 8.5
Xinhui Shu,Ping Guo,Gan Zhang,Wei Zhang,Hong Hu,Juan Peng,Yonghua Xiong,Bingfeng Ma,Weihua Lai
Pyrimethanil (PYR) is a fungicide that is harmful to consumers when present in foods at concentrations greater than maximum permitted residue levels. High-performance immunoprobes and dual-readout strategy may be useful for constructing sensitive lateral flow immunoassay (LFIA). Herein, the prepared litchi-like Au–Ag bimetallic nanospheres (LBNPs) exhibited high mass extinction coefficients and fluorescence quenching constants. Benefiting from LBNPs and dual-readout mode, the limits of detection of LBNPs-CM-LFIA and LBNPs-FQ-LFIA for PYR were 0.957 and 0.713 ng mL −1 , which were 2.54- and 3.41-fold lower than that of gold nanoparticles-based LFIA, respectively. The limits of quantitation of LBNPs-CM-LFIA and LBNPs-FQ-LFIA were 3.740 and 1.672 ng mL −1 , respectively. LBNPs-LFIA was applied to detect PYR in cucumber and grape samples with satisfactory recovery (90%–111%). LBNPs-LFIA showed good agreement with LC-MS/MS for the detection of PYR in the samples. Accordingly, this sensitive and accurate dual-readout LFIA based on LBNPs can be effectively applied for food safety.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
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IF 3.909
QingBo Xu,XiaTing Ke,LiWen Shen,NaiQin Ge,YanYan Zhang,FeiYa Fu,XiangDong Liu
To obtain durably antimicrobial cotton fabric, carboxymethyl chitosan (CMC) was covalently linked to cotton fibers via an esterification with the cellulose hydroxyl groups, and the silver nanoparticles (Ag NPs) were adhered to the fiber surface by the coordination bonds with the amino groups of CMC. The finished cotton fabrics have an excellent antibacterial function and outstanding laundering durability. Even after 50 consecutive laundering tests, the modified cotton fabrics still show satisfactory bacterial reduction rates (BR) against both S. aureus and E. coli , which are all higher than 94%. These findings allow for broader applications of antimicrobial cotton textiles with a decreased safety risk and lower environmental impact arise from the Ag NPs.
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