APPLIED SURFACE SCIENCE
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2017
·
IF 3.387
Kunjuan Shao,Yanjie Wang,Muzaffar Iqbal,Lin Lin,Kai Wang,Xuehua Zhang,Meng He,Tao He
Modification of a wide-bandgap semiconductor with noble metals that can exhibit surface plasmon effect is an effective approach to make it responsive to the visible light . In this work, a series of cubic and all-edge-truncated SrTiO 3 with and without thermal pretreatment in air are modified by Ag nanoparticles via photodeposition method. The crystal structure, morphology, loading amount of Ag nanoparticles, and optical properties of the obtained Ag-SrTiO 3 nanomaterials are well characterized by powder X-ray diffraction, scanning microscope, transmission electron microscope, energy disperse X-ray spectroscopy, ICP-MS and UV–vis diffuse-reflection spectroscopy. The loading amount and size of the Ag nanoparticles can be controlled to some extent by tuning the photodeposition time via growth-dissolution mechanism. The Ag nanoparticles are inclined to deposit on different locations on the surface of cubic and truncated SrTiO 3 with and without thermal pretreatment. The resultant SrTiO 3 modified by Ag nanoparticles exhibits visible light activity for photocatalytic reduction of CO 2 , which is closely related to the oxygen vacancy induced by thermal pretreatment, size and amount of Ag nanoparticles. Accordingly, there is an optimized photodeposition time for the synthesis of the photocatalyst that exhibits the highest photocatalytic activity.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2017
·Vol. 93
·期 3
·761-775
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IF 3.135
Qi Chen,Zongxue Yu,Fei Li,Yang Yang,Yang Pan,Yixin Peng,Xi Yang,Guangyong Zeng
BACKGROUND Membrane separation is a promising process for treatment of dye and oily wastewater if the antifouling capacity and recyclability can be improved. In recent years, the development of photocatalytic materials has provided new methods for research into membrane technology. RESULTS In this study, a novel photocatalytic membrane decorated with RGO-Ag-TiO 2 nanomaterial was fabricated by simple vacuum filtration for degradation of dye and separation of oil–water. First, TiO 2 nanowires were prepared for more effective photocatalysis, reduced graphene oxide (RGO)-Ag-TiO 2 was fabricated by a facile hydrothermal reaction, then it was directly decorated on cellulose acetate (CA) membrane using polyethylene glycol and glutaraldehyde. CONCLUSION The as-prepared photocatalytic membrane can simultaneously degrade dye and separate oil–water emulsions under visible-light irradiation in a short time. The membrane has extremely high water flux (191 L m -2 h -1 ) and rejection rates (almost 100%) of dye–oil–water emulsion. More importantly, the photocatalytic membrane shows excellent antifouling capacity and recyclability, and retains relatively stable dye–oil–water permeation flux (about 27.5 L m -2 h -1 ) and high rejection rates (up to 99%) after six cycles of experiments under visible-light irradiation. Overall, the photocatalytic membrane opens up new avenues for the treatment of wastewater. © 2017 Society of Chemical Industry
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FOOD CONTROL
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2024
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IF 5.6
Xiangyu Song,Huhu Wang,Xuefei Shao,Xiaobo Yu,Xinglian Xu
Salmonella Typhimurium is the prevalent pathogenic bacterium that causes foodborne-related diseases. Here, we developed a surface-enhanced Raman scattering (SERS) biosensor for S . Typhimurium detection. The biosensor was based on Au@Ag core-shell nanorods (Au@Ag NRs) to enhance Raman signal and aptamer-specific identification. 4-mercaptobenzoic acid (4-MBA) and aptamer-modified Au@Ag NRs were used as Raman signal probes. The aptamer adsorbed on the Au@Ag NRs surface when the reaction system was free of bacteria. Once S . Typhimurium was added, the aptamer then specifically identified and captured the cells. The decrease of free aptamers in solution restoring the SERS “hot spot” between the Au@Ag NRs and enhancing the 4-mercaptobenzoic acid (4-MBA) Raman signal. Quantitative analysis of S . Typhimurium was performed using Raman-enhanced spectroscopy. Under optimised conditions, the 4-MBA SERS intensity at 1072 cm −1 was used to determine S . Typhimurium in the range of 10 2 –10 7 CFU mL −1 (y = 1660.84x+2340.7, R 2 = 0.9912). The limit of detection was 64 CFU mL −1 . This method also has high specificity and is not interfered by the other five control bacteria to complete the detection of S . Typhimurium. The developed method is simple, rapid, sensitive and specificity, which can be used to detect actual samples. It can be potentially used for detecting bacteria.
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Nano Energy
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2024
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IF 16.8
Dongzhen Chen,Yang Li,Jianzhao Gao,Meng Zhang,Junhao Liang,Tao Fu,Xiaoming Wu,Xinhai He,Liangjun Xia,Weilin Xu
Intelligent wearables with integrated biomechanics and biomolecule multimodal sensing systems are crucial for personalized healthcare. However, the modes of action of biomechanics and biomolecule sensing work in different ways. Hence, a method for manufacturing biomimetic fibers made of polyvinylidene fluoride (PVDF)@silver (Ag) is initially devised, and a textile carrier serves as a link for multimodal sensing of biomechanics and biomolecules. PVDF nanofiber membranes are created using a one-step electrospinning process . Next, by lowering the silver ion’s reduction potential, compact and homogenous Ag nanoparticles (NPs) are formed in-situ on the high-curvature PVDF fibers. Consequently, a PVDF@Ag fiber membrane with a piezoelectric response and a localized surface plasmon resonance (LSPR) effect is created, making it suitable for wearable sensors that can detect secreta molecules as well as muscle movements. PVDF@Ag fiber is twisted, taking inspiration from the spiral structure of butterfly antennae. Compared to untwisted, twisted PVDF@Ag fiber, this produces a surface-enhanced Raman scattering (SERS) output signal that is more stable and can resist for signal attenuation caused by tensile deformation during wearable sensing. The “fingerprint” spectra of SERS enable noninvasive extraction and detection of secretion signals at sweat and respiration. Additionally, a plausible correlation between the range of secretions produced and health-related data is examined. Additionally, the integrated PVDF@Ag by polyester fabric exhibits superior air permeability , moisture absorption , and antimicrobial properties. And, this multimodal sensing mechanism has an algorithm implanted with deep learning support. All things considered, the PVDF@Ag fiber functions as a bridge between biomolecules and biomechanics, which is essential for applications involving wearable healthcare management.
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ACS Applied Polymer Materials
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2024
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IF 4.4
Shuolei Wang,Wenjun Wang,Zhonggui Zhang,Xiaojian Jiang,Ziyue Zhang,Hongyu Gao,Shi Xu,MD Zahidul Islam,Yaofeng Zhu,Yaqin Fu,Qingqing Ni,Yubing Dong
In this study, we developed composite fibers composed of silver (Ag)/boron nitride (BN)/ethylene-vinyl acetate copolymer (EVA) utilizing a combination of melt spinning–UV irradiation and chemical Ag-plating techniques. The inclusion of the BN filler was aimed to enhance the thermal conductivity and accelerate the response of EVA, while the application of a nano-Ag coating provided the fiber with high electrical conductivity. The results indicated that the electrical conductivity of the Ag/BN/EVA composite fiber achieved a notable value of 2.47 × 104 S/m. These composite fibers exhibited exceptional two-way shape memory properties, electrothermal conversion characteristics, and electrically driven actuation capabilities. Significantly, we demonstrated that by applying a voltage of merely 2.5 V, it was possible to precisely control the electrically reversible driving strain of the Ag/BN/EVA composite yarn by adjusting the energization time, resulting in an impressive energy density of 99.96 J/kg under a loaded weight (34.50 g), which is approximately 4107 times its own weight (0.0084 g). This led to the development of a composite yarn artificial muscle with a high load-bearing capacity, remarkable energy density, and low driving voltage requirements.
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Surfaces and Interfaces
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2024
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IF 5.7
Xinru Wang,Qiuxu Chen,Daming Yang,Ying Li,Dongxu Yin,Baoxin Ni,Wei Lu,Guiru Sun,Ming Feng
Photo-assisted electrochemical strategy has garnered interest for its ability to diminish the large overpotential of lithium-oxygen batteries (LOBs). Nonetheless, creating a sophisticated photocatalyst capable of absorbing a wide spectrum of light and dramatically lowering the recombination rate for electron-hole pairs presents a significant challenge. Herein, we design an Ag-doped ZnO (Ag@ZnO) hollow nanosphere as photocatalysts to boost the reaction dynamics of photo-assisted LOBs. The Ag@ZnO hollow nanospheres, featuring a mesoporous structure, are beneficial for improving O 2 transport and enabling the retention of discharge products. Additionally, the ability to absorb light and the efficiencies of electron-hole separation are enhanced for Ag@ZnO as a result of Ag doping. The electrons generated by photoexcitation facilitate the conversion of O 2 to produce Li 2 O 2 during discharge, whereas during charging, the presence of holes causes the decomposition of Li 2 O 2 . Consequently, a significantly low overpotential of 0.22 V, ultrahigh cycling efficiency of 93.73%, and good reversibility was achieved for the photo-assisted LOBs using Ag@ZnO. We consider that this work can offer a reliable strategy to improve electrochemical kinetics and contribute to the development of efficient photocatalysts for photo-assisted LOBs.
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RSC Advances
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2015
·Vol. 5
·期 110
·91056-91061
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IF 3.84
Qian Zhang,Chen Zhou,Aisheng Huang
Based on a bio-inspiration polydopamine reaction platform, hollow Ag/carbon microporous spheres were facilely prepared through a template-assisted method. The hollow Ag/carbon spheres, with a uniform shell thickness of 30 nm and a high Ag loading, show high catalytic activity for the reduction of 4-nitrophenol by NaBH4 to 4-aminophenol. It is found that the 4-nitrophenol (10 mL, 1 × 10−3 M) can be completely converted to 4-aminophenol in 2 min by adding 20 mg of hollow Ag/carbon catalysts. The catalytic activity of the hollow Ag/carbon microporous spheres is also confirmed by CO oxidation. At 200 °C, 100% CO conversions can be achieved by using hollow Ag/carbon microporous spheres as catalysts, which is promising to replace other noble metal catalysts in metal catalyzed reactions.
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NEW JOURNAL OF CHEMISTRY
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2015
·Vol. 40
·期 1
·441-446
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IF 3.086
Xinzhen Zhao,Yongliang Chen,Huixia Xuan,Chunju He
This work presented a novel kind of one-dimensional multi-functional modifier for membrane materials. Cysteine modified silver nanowires (C-AgNWs) were used to modify polyvinylidene fluoride (PVDF) membranes and the comprehensive optimized properties including separation efficiency, mechanical strength and antifouling ability of PVDF membranes demonstrated that monodisperse, orientated and zwitterionic C-AgNWs were an efficient modifier for the PVDF ultrafiltration membrane. The objective of this work was to comprehensively improve the application performance of polymer materials using the special hybrid mechanism of one-dimensional nanomaterials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Zhi Zhu,Ziyang Lu,Dandan Wang,Xu Tang,Yongsheng Yan,Weidong Shi,Youshan Wang,Nailing Gao,Xin Yao,Hongjun Dong
A high-dispersed Ag/Fe 3 O 4 /g-C 3 N 4 composite photocatalyst is firstly synthesized by means of the selective photo-deposition technique. It exhibits the obvious improvement of photocatalytic activity and stability for degrading tetracycline besides retaining the recycled magnetic property. The enhanced photocatalytic activity originates from synergetic effect of Ag, Fe 3 O 4 and g-C 3 N 4 that improves light absorption capacity and separation efficiency of charge carriers. This work provides a promising approach to develop visible-light-response and recycled photocatalysts applied to antibiotic wastewater treatment .
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Fangqing Wang,Xueru Zhao,Ying Li,Limin Liang,Kotaro Sasaki,Qiuyan Hao,Wenhao Yuan,Sijia Li,Hui Liu
Transition-metal selenides exhibit excellent catalytic activity towards oxygen evolution reaction (OER), but suffering from serious performance degradation due to the surface reconstruction during OER. Herein, we found that the incorporation of Ag single atoms in NiSe 2 electrocatalyst (Ag SA -NiSe 2 ) could suppress the surface reconstruction, improving both catalytic activity (179 mV@10 mA cm −2 ) and stability (500 h @ ∼100 mA cm −2 ) for OER in 1.0 M KOH. The aberration corrected transmission electron microscope and X-ray absorption structure analysis reveal the co-existence of the Ag single atoms and Se vacancies in NiSe 2 matrix. In-situ Raman spectroscopy demonstrates that the introduction of single-atom Ag and Se vacancies in NiSe 2 successfully inhibits the formation of NiOOH species on the surface during OER, accounting for the excellent stability. The theoretical calculation result indicates that the Ag single atom and Se vacancies in NiSe 2 synergistically optimizes the adsorption/desorption of OER intermediates, boosting the intrinsic activity.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Weiqian Cai,Youqun Wang,Linshan Xiong,Yingjie Zheng,Zhibin Zhang,Xiaohong Cao,Yunhai Liu
Cuprous oxide (Cu 2 O), a promising semiconductor material, has been less employed in the photocatalytic removal of uranium. In this work, silver and gold nanoparticles were introduced on the surface of Cu 2 O. HR-TEM, XRD and XPS were applied in characterized the physic-chemical properties of composite. In comparison to Cu 2 O, Au modified Cu 2 O (Au/Cu 2 O-N) demonstrated a significantly enhanced uranium removal rate, reaching 100% within 120 minutes. This represents a 2-fold increase in the uranium removal rate compared to pure Cu 2 O-N. The reason con be interpreted including the red-shift of the absorption band from 600nm-800nm, the formation of Schottky junction between Au and Cu 2 O, the electron traps constructed by Au itself. Consequently, the rate of photogenerated electron-hole complexation is significantly diminished. Free trapping and EPR prove that reactive radicals are O 2 - . This has led to the development of a novel approach, namely the synergistic strategy of noble metal loading and nitrogen-doped cuprous oxide, which has the potential to facilitate the visible light removal of U(VI) from toxic wastewater.
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WATER AIR AND SOIL POLLUTION
·
2017
·Vol. 228
·期 8
·1-13
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IF 1.702
Fu Likang,Zhang Libo,Wang Shixing,Peng Jinhui,Zhang Gengwei
Surface modification of the silica nanoparticles was performed using trithiocyanuric acid (TCA-SNPs) so as to enhance the adsorption of Ag + from aqueous solutions. The surface modification to the adsorbent was characterized by Fourier transform infrared spectroscopy, transmission electron microscope, and X-ray photoelectron spectroscopy. The Ag + adsorption capacity was found to increase with increase in the solution pH, with the optimal pH being 5.0. The Ag + adsorption isotherm was generated at 25 °C at the optimal solution pH and the maximum adsorption capacity was found to be 80 mg/g, significantly higher than the adsorption capacity reported for other adsorbents in literature. The increase in adsorption capacity was attributed to the presence of thiol groups on the surface of the modified adsorbents. Additionally, the adsorption kinetics was estimated at 25 °C, which indicated very high rates of adsorption initially, with rapid reduction in rate of adsorption with time. Both adsorption isotherms as well as the adsorption kinetics were modeled with popular models. The adsorption isotherm was found to match with the Langmuir model while the adsorption kinetics was found to match with the pseudo-second-order kinetic model. The adsorption-desorption cycles indicate the TCA-SNPs to be stable adsorption performance and retain high adsorption efficiency ensuring commercial adoption. A relatively low adsorption of other ions such as Mn 2+ , Cu 2+ , Ni 2+ , Co 3+ as compared to Ag + was ensured.
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