VACUUM
·
2024
·
IF 3.8
Ying Du,Juan Li,Xinqi Ma,Quanhui Guo
With the development of economy, overuse of antibiotics has been seen as a huge threat to human health. Photocatalytic degradation is an effective method for resolving this problem at present. The method of combining plasmon resonance effect and Z-scheme heterojunction can effectively improve the separation efficiency of photogenerated carrier, which is of great significance for the treatment of antibiotic wastewater. Herein, the Ag/Ag 2 CrO 4 /g-C 3 N 4 catalyst was prepared by in-situ loading and photo-reduction method for the degradation of antibiotic wastewater containing tetracycline and quinolone antibiotics . The research results showed that mesoporous graphitized carbon nitride (denoted as g-C 3 N 4 ) provided good support for Ag and Ag 2 CrO 4 nanoparticles , and mesoporous composite Ag/Ag 2 CrO 4 /g-C 3 N 4 (denoted as ACO /CN) provided more reaction sites for organic pollutants degradation. Under visible light irradiation, 5%ACO/CN catalyst showed the best degradation activity and stability for tetracycline (TC), levofloxacin (LVFX), oxytetracycline hydrochloride (OTC) and norfloxacin (NFLX), and their degradation rate constants were respectively 5.66, 8.26, 11.72 and 15.97 times of Ag 2 CrO 4 which indicated it had good potential application value in the treatment of wastewater containing various organic pollutants. This benefits from the plasmon resonance effect of silver effectively improves the utilization efficiency of visible light and the Z-scheme heterojunction between Ag 2 CrO 4 and g-C 3 N 4 promotes the rapid transmission of photogenerated carriers. Based on the experimental results, the possible TC degradation pathway and photocatalytic mechanism were proposed. This study provides a simple way for the successful design and preparation of plasmon resonance effect synergistic Z-scheme heterojunction with promising applications in the treatment of antibiotic wastewater.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Danping Wang,Erwei Cheng,Zhaoming Qu,Yingying Wang,Qingguo Wang
Ag thin films having attractive optical transmittance and effective shielding capability are usually used as a preferred choice for the transparent electromagnetic shielding windows. Whereas, the Ag films are grown primarily via an island growth (Volmer-Weber) mechanism, which greatly restricts its application. In this study, by introducing Al atoms and suitable annealing treatment, the continuous and smooth Ag thin films are successfully fabricated by magnetron co-sputtering method. The effect of annealing temperature on the microstructure, optical and electromagnetic shielding properties of the films are conducted the comprehensive and profound study. Our results indicate that the 5 mol% Al-Ag thin film annealed at 200 °C could transform into planar growth structure, and display excellent the highest optical transmittance 89.15 % at 550 nm. Meanwhile, the shielding effectiveness (SE) reaches a peak value of 28.1 dB. 500 °C is estimated as the threshold annealing temperature of Al-Ag thin film with comprehensive performances gradually declining. Moreover, the Al dopants significantly improve the thermal stability of Ag thin films than that of the pure Ag films. These findings are of important guidance for the preparation of high-quality Al-Ag thin films to meet the practical applications.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·
IF 3.5
Chu Siyu,Sun Min,Kang Liping,Guo Xiaowen,Wang Haiyan,Li Bin,Li Zijiong
Although carbon-based catalysts show great potential in oxygen reduction reaction (ORR), it is still a challenge to increase their catalytic efficacy while reducing the amount of precious metals such as platinum and palladium. In this research, a palladium–silver bimetallic catalyst (Pd–Ag/CD) was flexibly synthesized through the in-situ self-reduction of palladium chloride and silver nitrate by carbon dots (CD). This novel catalyst displayed remarkable activity for the ORR, with peak potential, onset potential, and half-wave potential recorded at 0.89 V, 1.004 V, and 0.88 V, respectively. The exceptional performance of Pd–Ag/CD is attributed to the synergistic adjustment of the d-band by the palladium and silver metals, which optimizes the adsorption of oxygen and boosts the reaction's overall activity. Additionally, the slight negative shift of 12 mV in the half-wave potential after 5000 cycles indicates the catalyst's excellent durability. The findings of this study offer valuable theoretical insights for the development of carbon nanomaterial-based catalytic systems.
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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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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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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaoyan He,Yanling Liang,Jing Li,Yuanyuan Lu,Xin Tian,Zhiqiang Wang,Runze Cao,Penggai Ma,Shuo Ma,Xiaoquan Lu
Solar interfacial evaporation technology, as an emerging sustainable water purification strategy, provides both an economical and environmentally friendly way to solve water resource problems. However, it still faces certain limitations and challenges in treating polluted wastewater containing volatile organic compounds (VOCs). In this paper, MXene-TiO 2 -Ag composites were embedded into a polyvinyl alcohol (PVA) hydrogel system using kapok fibres as biomass templates, and a bifunctional and environmentally friendly solar evaporation system (MTAH) was successfully constructed for both efficient solar freshwater production and phenol removal (typical VOC). The MTAH evaporator demonstrated excellent evaporation performance with an evaporation rate as high as 3.09 kg m −2 h −1 and a photothermal conversion efficiency as high as 93.16 % under 1 solar light intensity. The self-growth property of TiO 2 on the MXene surface endowed the evaporator with the ability of photocatalytic degradation of pollutants. In addition, the incorporation of trace Ag nanoparticles played positive roles, which not only significantly enhanced the photothermal conversion performance of MXene, but also broadened the light response range of TiO 2 and effectively suppressed the complexation of photogenerated electron-hole pairs. The MTAH evaporator shows an excellent removal rate of 91.84 % for high VOC concentrations (100 ppm phenol), effectively avoiding secondary contamination of the condensate. The finding paved the course for the sustainable and eco-friendly solution for freshwater scarcity.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xinyu Chen,Yingrui Nie,Wenqian Fan,Zhimin Zhao,Zhifei Wang,Yong Jiang
In this study, yolk-shell magnetic hydrogel microspheres loaded with silver nanoparticles (Fe 3 O 4 @P(DVB-co-MAA)@Ag) were innovatively constructed for efficient catalytic reduction of nitroaromatic compounds. First, hollow P(DVB-co-MAA) microspheres were prepared as shell. Fe 3 O 4 magnetic nanoparticles were successfully deposited into the microspheres as yolk through the decomposition of metal-organic precursor salts in high-temperature organic solvents. The EM images shows that Fe 3 O 4 @P(DVB-co-MAA) microspheres consist of a magnetic core, an intermediate void layer, and a hydrophilic hydrogel shell, demonstrating a unique multilayered structural feature. Then, highly active silver nanoparticles were uniformly loaded onto the hydrogel shell surface using the thermal co-reduction method. Catalytic results demonstrated that the yolk-shell material showed significantly enhanced activity toward the reduction of 4-nitrophenol (4-NP) and 2-nitroaniline (2-NA), compared to the core-shell structured composite microspheres. The catalytic parameters were 65.44 s⁻¹ g⁻¹ and 46.44 s⁻¹ g⁻¹ , respectively. Remarkably, the composite retained over 85 % catalytic efficiency after five cycles of use and achieved rapid magnetic separation within 20 s under an external magnetic field.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wei Ni,Guixin Li,Yutong Zhao,Yi Fang,Shan Huang,Fuxiang Wei,Qi Xiao
The development of multifunctional nanomaterials for efficient detection of hazardous metal ions and effective antibacterial treatment is of great significance in environmental monitoring and public health protection. In this study, nitrogen-doped red carbon dots (R-CDs) with a fluorescence emission peak of 633 nm were synthesized through a facile one-pot hydrothermal approach using p -phenylenediamine and D-sorbitol as precursors. The obtained R-CDs possess outstanding photostability and water dispersibility. Based on a combined mechanism of electron transfer and static quenching, the R-CDs serve as a highly sensitive fluorescent probe for Ag + detection, achieving a detection limit as low as 0.43 μM. To extend their practical utility, a portable smartphone-assisted sensing platform coupled with RGB color analysis was constructed, allowing direct capture and analysis of fluorescence images for rapid on-site visual quantification of Ag + with a detection limit of 2.95 μM. Moreover, the R-CDs exhibit a remarkable photothermal conversion efficiency of 38.86 % under 808 nm laser irradiation. Benefiting from this property, the material achieves an antibacterial efficiency of up to 99.91 % against E. coli through photothermal ablation. This work not only offers a reliable and field-deployable strategy for Ag + monitoring but also demonstrates the great potential of R-CDs as an integrated nanoplatform for environmental safety and biomedical applications.
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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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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-14
·
IF 5.3
Bi Leyao,Fu Boyan,Lin Jiahui,Wen Junsheng,Fu Jiaxing,Tian Wenyue,Su Ningning,Zou Binglin,Wang Chunjie,Wang Yue
Soda biscuit-like Ag-ZnO@ZIF-8 heterostructures were successfully synthesized using a secondary hydrothermal method for the first time, demonstrating exceptional ethylene glycol sensing performance. The sample (2-Methylimidazol (MeIm) concentration of 0.04 g) exhibits a remarkable response value of 1325.50 to 100 ppm ethylene glycol at 240 °C, along with a rapid response time of merely 7 s. Additionally, it displays outstanding gas selectivity (k = 28.63–696.90), great reproducibility and long-term stability. Further experiments indicate that the enhancement of the composite material’s gas sensing performance can be primarily attributed to the interfacial electron transfer effect, the abundance of oxygen vacancies, and the synergistic interactions within the heterostructures. Overall, this study lays a solid theoretical foundation for the practical detection applications of ethylene glycol and provides new insights into the research on gas sensors based on ZnO-organic frameworks. Graphical
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SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Pan Zhang,Changmei Wu,Lan Xie,Bai Xue,Yi Jiang
Considering the current challenges associated with fossil fuel scarcity and ice accumulation on solid surfaces, we propose a sustainable strategy that utilizes solar energy for ice formation, using a superhydrophobic coating possessing photothermal capabilities to tackle the challenges of icing and de-icing. We have successfully integrated the Fe 3 O 4 @SiO 2 @FAS/Ag-rGO composites into an epoxy matrix to create a photothermal superhydrophobic coating. The innovative coating boasts outstanding super-hydrophobicity with a water contact angle of 153.8°, resulting in a 60 μL water droplet experiencing a freezing delay of 1498 s at −20 °C ambient conditions, which is longer than that of pure EP coating. Additionally, the coating exhibits an impressive photothermal effect, raising the surface temperature to 58.8 °C under 1 sun. The coating also demonstrates rapid de-icing capabilities, clearing ice in just 120 s under 40 mW/cm 2 . By leveraging the light-trapping effect, utilizing the plasma resonance of silver, and incorporating a high surface roughness micro-nano hierarchical structure, the coating achieves exceptional photothermal conversion efficiency and anti-icing performance. Moreover, the coating's chemical and mechanical durability enhance its practicality and potential utility across various applications. In conclusion, this innovative superhydrophobic coating with photothermal properties offers a promising solution for various practical applications such as anti-icing and de-icing.
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