Catalysts
·
2020
·Vol. 10
·期 7
·746
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IF 3.52
Yuxiang Lu,Jikai Mao,Zelin Wang,Yazhou Qin,Jianguang Zhou
Controllable morphological metal catalytic materials have always been a focus in research. In the previous work, hexapod AgCl was successfully synthesized. In this paper, hexapod Ag@AgCl microstructures with diverse Ag contents are prepared through NaBH4reduction. They are characterized by scanning electron microscopy (SEM) and the element distribution is proved by an energy dispersive X-ray spectrometer (EDS). They are porous dendritic microstructures with a large specific surface area and a rough surface, which display high catalytic performance and surface-enhanced Raman spectroscopy (SERS) activity. Furthermore, the hexapod Ag@AgCl microstructure is devoted as a dual catalyst to monitor the reduction of 4-nitrothiophenol (4-NTP) to 4-aminothiophenol (4-ATP) in situ using SERS. Ultraviolet–visible (UV–Vis) spectroscopy was employed to evaluate the catalytic performance of the hexapod Ag@AgCl microstructures. The consequences show that the velocity of reaction became faster with a corresponding increase in silver content and the reaction mechanism was cleared. In addition to preparing a good catalyst, this work also promotes the combination of micro-nano materials and spectroscopy technology.Keywords:Ag@AgCl microstructure;in situ monitoring;surface-enhanced Raman spectroscopy;4-nitrothiophenol reduction
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ADVANCED SYNTHESIS & CATALYSIS
·
2016
·Vol. 358
·期 16
·2631-2641
·
IF 6.453
Lingling Wang,Min Yu,Chaolong Wu,Nan Deng,Chao Wang,Xiaoquan Yao
In this contribution, an Ag/g-C 3 N 4 nanocomposite was synthesized and utilized as highly efficient and green photocatalyst for organic reactions under visible light irradiation. A layered, porous g-C 3 N 4 was synthesized following a modified solvothermal-roasting process by using melamine and cyanuric chloride as precursor. Silver nanoparticles (NPs) were well anchored on g-C 3 N 4 nanosheets, which were prepared by a facile impregnation–roasting method. The inexpensive, stable g-C 3 N 4 coupled with the localized surface plasmon resonance (LSPR) effect of Ag NPs exhibited high photocatalytic activities toward aerobic oxidative amidation of aromatic aldehydes under visible light irradiation. Good to excellent yields were achieved for various substrates under the light of a 25 W compact fluorescent light (CFL) bulb in air. The operationally easy procedure provides an economical, green, and mild alternative for the formation of amide bonds.
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Journal of Water Process Engineering
·
2026
·
IF 6.6
Yao Wang,Ziling Guo,Ziyan Shen,Liang Zhang,Bing Xu,Kangkang Wang,Zhixian He,Shengnan Zhang
A superhydrophilic/underwater superoleophobic Ag/ZrO₂-PC coating was fabricated on stainless steel mesh. • The coating exhibits a separation efficiency of >99.9% and a flux of 1.82 × 10 4 L·m −2 ·h −1 . • Efficiency remains >98.7% under acid, alkali, and saline conditions. • Photocatalytic self-cleaning recovers surface wettability (51° → 13.8°) under visible light. As environmental pollution intensifies and water quality regulations become increasingly stringent, the development of efficient separation technologies has emerged as a critical priority. In this study, Ag/ZrO 2 -PC (AZPC) composite coatings with photocatalytic self-cleaning properties were fabricated on stainless-steel meshes via metal-organic deposition combined with hydrothermal processing, enabling highly efficient oil-water separation. The resultant coatings exhibit a micro−/nano-scale rough topography, which impacts superhydrophilicity (water contact angle (WCA) of 0°) and underwater superoleophobicity (underwater oil contact angle (UOCA) of 161°). The composite membrane achieves an oil-water separation efficiency exceeding 99.9%, with a maximum permeation flux of 1.82 × 10 4 L·m −2 ·h −1 . After 20 separation cycles, the membrane retains a separation efficiency above 98.6% for different oil-water mixtures, demonstrating excellent cyclic stability. Furthermore, after 60 min of visible-light irradiation, the surface WCA decreased significantly from 51° to 13.8°, thereby demonstrating superior self-cleaning capability. Collectively, these findings indicate that the as-prepared composite material demonstrates outstanding stability and durability, rendering it highly promising for practical applications in high-efficiency oil-water separation.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 9
·期 2
·302-309
·
IF 6.569
Jiayu Xin,Fei Li,Zhen Li,Jiaqi Zhao,Yu Wang
Single-atom dispersed carbon nitride photocatalysts have been extensively associated with clean energy conversion, storage and utilization. However, it is still a challenge to elucidate the relationship between the electronic structure of catalysts and their photocatalytic properties. In this work, single atom Ag/C3N4 catalysts have been prepared via pyrolyzing cyanuric acid, AgNO3 and melamine as precursors. We observe that their photocatalytic activity increases on increasing the concentration of Ag from 0.32% to 0.53%, and subsequently decreases on further increasing the concentration of Ag, which indicates that the concentration of Ag atoms can control the performance of single-atom catalysts. Deep investigations suggest that the concentration of Ag atoms can modulate the bottom of the conduction band (CB) and the maximum of the valence band (VB). The higher the bottom of the CB is, the better the performance of catalysts is. In contrast to bulk carbon nitride, the rate constants of the optimized single-atom photocatalyst Ag/C3N4 with 0.53% Ag for rhodamine B (RhB) and tetracycline (TC) degradation are enhanced approximately 165.3 and 24.9 times, respectively. Furthermore, the ESR spectrum shows that the superoxide radical plays a major role in the photocatalytic process. This work provides a new insight into the structure–property relationship and our strategy provides guidance for the synthesis of other single-atom photocatalysts.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Zheng Feng,Peng Zhang,Xue Yang,Xiaowei Guo,Jiamin Yu,Liangguang Du,Jimin Shao,Hui Liang,Hong Jiang
Surface-enhanced Raman spectroscopy (SERS) has great potential for rapid detection of trace levels of pesticides in food. Scientists have much interested in this analytical technique due to its sensitivity, rapid detection, simplicity, and low cost. However, most of researchers are only focusing on the detection of a single pesticide residue . In this paper, we firstly report the simultaneous detection of two pesticide residues in tobacco leaves by using composite SERS substrate of SiO 2 @Ag nanoparticles . The entire analysis time is less than 10 min. The detection results show satisfactory linearity in the range of 0.1–25 mg/kg and 1–25 mg/kg with the limit of detection of 0.1 mg/kg and 1 mg/kg for carbendazim and flumetralin in tobacco samples, respectively. The recovery rates of carbendazim and flumetralin in the tobacco leaves are 85.2 ∼ 112.12 % and 90.38 ∼ 113.42 %, respectively. The detection results also show good uniformity and reproducibility, with a relative standard deviation(RSD) value of 4.4 % between substrates. Our reported substrate combined with portable Raman spectrometer provides a powerful tool for simultaneous detection of multiple pesticide residues for food safety.
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Small
·
2024
·
IF 13
Yuxin Zou,Guoqiang Liu,Hanxin Wang,Kang Du,Jinglun Guo,Zhenling Shang,Ruisheng Guo,Feng Zhou,Weimin Liu
Conductive hydrogels have attracted widespread attention in the fields of biomedicine and health monitoring. However, their practical application is severely hindered by the lengthy and energy-intensive polymerization process and weak mechanical properties. Here, a rapid polymerization method of polyacrylic acid/gelatin double-network organohydrogel is designed by integrating tannic acid (TA) and Ag nanoparticles on conductive MXene nanosheets as catalyst in a binary solvent of water and glycerol, requiring no external energy input. The synergistic effect of TA and Ag NPs maintains the dynamic redox activity of phenol and quinone within the system, enhancing the efficiency of ammonium persulfate to generate radicals, leading to polymerization within 10 min. Also, ternary composite MXene@TA-Ag can act as conductive agents, enhanced fillers, adhesion promoters, and antibacterial agents of organohydrogels, granting them excellent multi-functionality. The organohydrogels exhibit excellent stretchability (1740%) and high tensile strength (184 kPa). The strain sensors based on the organohydrogels exhibit ultrahigh sensitivity ( GF = 3.86), low detection limit (0.1%), and excellent stability (>1000 cycles, >7 days). These sensors can monitor the human limb movements, respiratory and vocal cord vibration, as well as various levels of arteries. Therefore, this organohydrogel holds potential for applications in fields such as human health monitoring and speech recognition.
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Materials Today Bio
·
2025
·
IF 10.2
Xinying Liu,Baohui Liu,Conglong Chen,Chaowei Hong,Jia Xu,Yixuan Ruan,Ling Huang,Shanni Hong,Wei Chen,Ye Kuang
A significant challenge in modern radiotherapy (RT) is to minimize the detrimental effects on adjacent healthy tissues while concurrently increasing the susceptibility of tumor tissue to radiation. Investigating nanoradiosensitizers with multifunctional properties has a lot of potential as a highly effective strategy for augmenting the efficacy of RT. A novel Janus Ag/Fe-HfO 2 nanoparticle was synthesized in a single-step process. This versatile nanoradiosensitizer combines photothermal capabilities, enzyme-like activities, and the capacity for magnetic resonance imaging (MRI). The surfaces have been meticulously engineered with PEG to boost biocompatibility and adorned with RGD-targeting peptides that selectively target tumor cells (Ag/Fe-HfO 2 -PEG-RGD). The characterization results have demonstrated the successful preparation of Janus Ag/Fe-HfO 2 nanoparticles with a diameter of roughly 10 nm. Furthermore, the photothermal properties, MRI ability, and enzymatic catalytic activities (generate O 2 , produce hydroxyl radical, and consume GSH) of Ag/Fe-HfO 2 -PEG-RGD were verified in vitro experiments. In vivo experiments, by integrating T 1 -weighted MRI-guided RT with the enzymatic activities of these nanoparticles, along with the application of photothermal heating, we have achieved a synergistic enhancement in the therapeutic efficacy of RT. Moreover, it stimulates tumor-specific immune responses, leading to an increased presence of tumor-infiltrating CD8 + T cells. This integrated multimodal nanotherapeutic platform, which capitalizes on the potent enhancement of RT effects, offers a promising new strategy in the ongoing battle against cancer.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhihan He,Linjia Li,Youyu Pang,Meng Cui,Yanhong Lin,Tengfeng Xie
The photocatalytic synthesis of hydrogen peroxide (H₂O₂) through the two-electron oxygen reduction reaction (ORR) presents a sustainable approach for the production of this industrially crucial compound. However, the photocatalytic efficiency is hindered by inefficient charge separation and sluggish interfacial reaction dynamics. In this study, we have fabricated Ag-modified sulfur vacancy-rich ultrathin ZnIn₂S₄ nanosheets (Ag-Sv-ZIS) as highly effective ORR catalysts, which display a H₂O₂ production rate of 8966 μmol g −1 h −1 under visible light irradiation (≥420 nm). In-situ transient surface photovoltage (TPV) spectra and femtosecond transient absorption (fs-TA) spectra indicate that the incorporation of Ag efficiently promotes the interfacial charge transfer between the photocatalyst and O₂. This research offers novel perspectives on the design of high-performance photocatalysts via the rational engineering of active sites and surface reaction dynamics for efficient photocatalytic H₂O₂ synthesis.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xinyue Wang,Chen Chen,Geoffrey I.N. Waterhouse,Xuguang Qiao,Yufeng Sun,Zhixiang Xu
Herein, a novel surface enhanced Raman spectroscopy (SERS) aptasensor was developed for amantadine (AMD) detection, based on magnetite nanoparticles coated with polyethylenimine, silver nanoclusters and aptamers (Fe 3 O 4 @PEI@AgNC-apt) as the capture probe and complementary DNA-modified gold nanorods (AuNRs@4-MPBA@Ag-c-DNA containing 4-mercaptophenylboric acid molecules) as the reporter probe. In the presence of AMD, the AMD and the reporter probe competed for the aptamer on the surface of the capture probe, resulting in the reporter probe detaching from the capture probe leading to a decrease in intensity of the SERS signal at 1067 cm −1 for 4-MPBA. Under optimal conditions, a good linear relationship was established between the SERS intensity at 1067 cm −1 and the logarithm of the AMD concentration over the range 10 −6 -10 2 mg L −1 , with a LOD of 0.50 × 10 −6 mg L −1 . The AMD levels in spiked samples were evaluated using the SERS aptasensor, with good recoveries ranging from 90.57% to 113.49% being obtained.
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Small
·
2025
·
IF 12.1
Yongping Qu,Huajun Zhou,Yuzhen Zhang,Peihua Zhao,Kai Yuan,Rui Zhou,Hui Gao,Yanzhong Wang
Seawater electrolysis is a promising route for hydrogen production. However, the elevated concentration of Cl − in seawater can cause the serious corrosion of electrode materials, which limits the large-scale application of seawater splitting for the generation of green hydrogen. Herein, nickel iron layered double hydroxide@Ag/iron foam (NiFe-LDH@Ag/IF) composites are synthesized using a two-step method at room temperature. The introduction of Ag not only induces the electron density redistribution of NiFe-LDH to promote the formation of NiFeOOH as the catalytically active sites, but also impress the corrosion of chloride ions during the seawater oxidation. The as-prepared NiFe-LDH@Ag/IF only requires a low overpotential of 255 mV at a current density of 500 mA cm −2 in alkaline solution, and it can stably operate for 1000 h without degradation. Importantly, the formed AgCl nanoparticles loaded on the surface of NiFe-LDH nanosheets can effectively prevent the corrosive effect of Cl − during the seawater oxidation process. Thus, NiFe-LDH@Ag/IF can maintain high catalytic activity and work stably for 1000 h at high current density of 500 mA cm −2 for seawater oxidation. This study presents a simple method for preparing self-supported electrocatalysts with excellent corrosion resistance and high catalytic activity in alkaline seawater oxidation.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Tao Gai,Jiaolai Jiang,Shaofei Wang,Yiming Ren,Shanli Yang,Zhen Qin,Lang Shao,Qian Wu,Jun Zhang,Junsheng Liao
Background In the fields of environmental monitoring and nuclear emergency, in order to obtain the relevant information of uranyl-induced environmental pollution and nuclear accident, it is necessary to establish a rapid quantitative analytical technique for uranyl ions. As a new promising technique, surface-enhanced Raman scattering (SERS) is hopeful to achieve this goal. However, uranyl ions are easily desorbed from SERS substrates under acidic conditions, and the structures of SERS substrates will be destroyed in the strong acidic aqueous solutions. Besides, the quantitative detection ability of SERS for uranyl ions needs to be promoted. Hence, it is necessary to develop new SERS substrates for accurate quantitative detection of trace uranyl in environmental water samples, especially in acidic solutions. Results In this work, we prepared silver ions/sodium alginate supramolecular hydrogel membrane (Ag + /SA SMH membrane), and the Ag + ions from the membrane were transformed into Ag/Ag 2 O complex nanoparticles under laser irradiation. The Raman signal of uranyl was strongly enhanced under the synergistic interaction of electromagnetic enhancement derived from the Ag nanoparticles and charge transfer enhancement between uranyl and Ag 2 O. Utilizing the peak of SA (550 cm −1 ) as an internal standard, a quantitative detection with a LOD of 6.7 × 10 −9 mol L −1 was achieved due to a good linear relation of uranyl concentrations from 1.0 × 10 −8 mol L −1 to 2 × 10 −6 mol L −1 . Furthermore, foreign metal ions hardly affected the SERS detection of uranyl, and the substrate could determine trace uranyl in natural water samples. Particularly, the acidity had no obvious effect on SERS signals of uranyl ions. Therefore, in addition to the detection of uranyl ions in natural water samples, the proposed strategy could also detect uranyl ions in strong acidic solutions. Significance and novelty A simple one-step method was used to prepare an Ag + /SA SMH membrane for rapid quantitative detection of uranyl ions for the first time. The proposed substrate successfully detected uranyl ions under acidic conditions by immobilizing uranyl ion in hydrogel structure. In comparison with the previous studies, a more accurate quantitative analysis for uranyl ions was achieved by using an internal standard, and the proposed strategy could determine trace uranyl in either natural water samples or strong acidic solutions.
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Journal of Materials Chemistry A
·
2025
·
IF 9.5
Hongyang Zhao,Jingying Luo,Zhuojian Li,Shuya Cui,Li Liu,Xin Tong
Manipulating the intrinsic properties of colloidal quantum dots (QDs) offers a promising pathway to achieve efficient solar-driven photoelectrochemical (PEC) hydrogen evolution toward carbon neutrality. In this work, a novel environmentally benign light-harvesting material of silver (Ag) and copper (Cu) co-doped zinc–indium–sulfide/zinc selenide (Zn–In–S/ZnSe) core/shell QDs was developed, wherein the co-dopants establish a synergistic charge transfer pathway of Ag-mediated hole migration to Cu acceptor states in the QDs, thus creating a stabilized donor–acceptor configuration for enhanced charge carrier extraction. As a consequence, the PEC devices fabricated using the optimized Ag, Cu-ZIS/ZnSe QDs delivered a maximum photocurrent density of 8.9 mA cm−2 at 0.6 V versus the reversible hydrogen electrode (vs. RHE) under 1 sun AM 1.5G illumination (100 mW cm−2), representing a 6.4-fold improvement over the undoped ZIS/ZnSe QD PEC systems. Moreover, the fabricated Ag, Cu-ZIS/ZnSe QD-based PEC device exhibited a hydrogen production rate of 105.8 μmol cm−2 h−1 with a faradaic efficiency (FE) of 72.4%, which is 8.5 times higher than the control device based on the undoped QDs. Our work presents a synergistic dopant engineering technique to optimize the charge kinetics of eco-friendly QDs for highly efficient PEC applications, showing great potential for constructing environment-friendly, low-cost and high-efficiency solar energy conversion systems.
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