JOURNAL OF NANOPARTICLE RESEARCH
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2012
·Vol. 14
·期 9
·1-13
·
IF 3.287
Zhang Shaofeng,Ren Feng,Wu Wei,Zhou Juan,Sun Lingling,Xiao Xiangheng,Jiang Changzhong
Inorganic or organic solid supported metal nanostructures have been attracted intensive interests in recent years. In this study, a novel and versatile approach for the preparation of solid supported silver nanocomposites is presented for the first time. In this method, the modified aldehyde groups on solid supporters are employed to reduce Ag[(NH 3 ) 2 ] + ions. The in situ reduced silver nucleus are directly coated on the surfaces of the supports and then used as both seeds and catalysts for the self-catalytic growth of Ag NPs. In this reaction, no additional reduction and protective agents are needed. Moreover, the size of the Ag NPs can be tuned by varying the concentration of the Ag[(NH 3 ) 2 ] + ions and the reaction time, which leads to the interesting change of the localized surface plasmon resonance absorption of the NPs. Such a synthesis method may realize the separation of nucleation and growth stages for the formation of Ag NPs and is proved to be a versatile method for the preparation of solid supported Ag nanocomposites (PS–Ag, Fe 3 O 4 –Ag, and SiO 2 –Ag), which would benefit the preparations and further applications of functional materials in near future.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Qi'an Chen,Zhanping Zhang,Zhuo Yang
The development of TiO 2 -based photocatalysts is significantly impeded by the limited photoresponsive and the rapid recombination of charge carriers generated by photons. In hence, a novel photocatalytic system of titanium dioxide nanotubes (TNTs) loaded Ag nanoparticles and carbon dots (TNTs/Ag/CDs) was developed, which quickly transferred charges, absorbed visible light, generated more reactive oxygen species, and demonstrated excellent photocatalytic degradation ability and anti-bacteria properties. Under the synergistic effect of surface plasmon resonance (SPR) of Ag NPs and high charge transfer efficiency of CDs, photo generated electron and hole recombination was suppressed, and visible light absorption was enhanced. The loading of Ag and CDs was excessive or insufficient to decrease the photocatalytic performance of the photocatalyst. Within 120 min under visible light, the methylene blue (MB) degradation efficiency of TNTs/Ag/CDs photocatalyst was higher than that of binary photocatalyst or TNTs photocatalyst, demonstrating excellent photocatalytic performance. The sterilization rate against E.coli and S.aureus of the TNTs/Ag/CDs photocatalyst was about twice that of TNTs. Therefore, TNTs/Ag/CDs photocatalyst provides ideas for designing high-performance photocatalysts and exhibits excellent potential in the field of wastewater treatment and other forms of environmental remediation.
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TALANTA
·
2024
·
IF 5.6
Xiatong Wang,Shaohe Chang,Xiaoling Zhang,Xuhua Guo,Yongjun Xu,Di Yang,Linpin Luo,Jiamin Wang,Haofen Wu,Yan Cui,Jianlong Wang,Yanwei Ji
The conventional lateral flow immunoassay (LFIA) based on gold nanoparticles (Au NPs) is limited by low sensitivity due to the insufficient brightness of Au NPs. To address this problem, noble metal nanomaterials with localized surface plasmon resonance (LSPR) and synthetic tunability are potential signal outputs for LFIA, which can achieve better optical properties by adjusting the preparation conditions. Herein, this study prepared the hollow silver/gold nano-stars (HAg/Au NSts) as LFIA signal output via the galvanic replacement method. HAg/Au NSts with anisotropic hollow alloy nanostructures exhibit a wide visible light absorption band and great NIR thermal conversion efficiency (η = 37.32%), which endows them with enhanced colorimetric and photothermal signals. Further, we constructed a colorimetric-photothermal (CM-PT) dual-signal HAg/Au NSts-LFIA and chose staphylococcal enterotoxin B as the target analyte. The linear range of HAg/Au NSts-LFIA is 0.19 – 100 ng mL -1 , and the limit of detection (LOD) is up to 0.29 ng mL -1 and 0.09 ng mL -1 in the colorimetric and photothermal modes respectively. Compared with the conventional Au NPs-LFIA, HAg/Au NSts-CM/PT-LFIA effectively improved the detection performance of LFIA. In addition, HAg/Au NSts-LFIA also showed satisfactory sensitivity (vLOD = 0.78 ng mL -1 ) and recovery (89.06 - 114.74%) in milk and pork samples. Therefore, this work provides a new shape design idea for noble metal nanomaterials in biosensor applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shuhao Xue,Peiyi Lin,Yuxia Pang,Zhixian Li,Mingsong Zhou,Xueqing Qiu,Hongming Lou
Despite the widespread utilization of nano silver composites in the domain of catalytic hydrogenation of aromatic pollutants in wastewater, certain challenges persist, including the excessive consumption of chemical reagents during the preparation process and the difficulty in recycling. In this study, silver ions were reduced in-situ by taking advantage of the adsorptive and reducing capacities of hydroxyls and amino groups on lignin porous microspheres (LPMs) under mild ultrasonic conditions, and lignin porous microspheres loaded with silver nanoparticles (Ag@LPMs) were conveniently prepared. Ag@LPMs had excellent catalytic and cycling performances for p-nitrophenol (4-NP), methylene blue (MB) and methyl orange (MO). The 4-NP could be completely reduced to 4-AP within 155 s under the catalysis of Ag@LPMs, with a pseudo-first-order kinetic constant of 1.28 min −1 . Furthermore, Ag@LPMs could still complete the catalytic reduction of 4-NP within 10 min after five cycles. Ag@LPMs with the particle size ranging from 100 to 200 μm conferred ease of recycling, and the porous structure effectively resolved the issue of sluggish mass transfer encountered during the catalytic process. At the same time, the binding force of nano silver and LPMs obtained by ultrasonic was stronger than that of heating, so the materials prepared by ultrasonic had better cycling performance. Silver ions concentration and pH value in the preparation process affected the catalytic performance of Ag@LPMs, 50 mmol/L Ag + and pH value of 7 turned out to be the optimization conditions.
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POLYHEDRON
·
2017
·
IF 1.926
Ling-Dong Chen,Lin-Xia Zhou,Yue-Qing Zheng,Hong-Lin Zhu
Two new supramolecular complexes [Ag 2 (MA) 2 (2-nbd)]·2.5H 2 O ( 1 ) and [Ag 2 (MA) 2 (3-npa)]·2H 2 O ( 2 ) (2-H 2 nbd = 2-nitroterephthalic acid; MA = melamine; 3-H 2 npa = 3-nitrophthalic acid) have been synthesized under ultrasound conditions and characterized by infrared spectra (IR), thermogravimetric analysis (TGA), elemental analyses (EA) and X-ray diffraction (XRD). Complex 1 exhibits 2D framework through the bridging of carboxylic acid ligand and melamine ligand. Complex 2 presents a binuclear silver structural unit, which was further construct to three-dimension structure via hydrogen-bond interaction. The photocatalytic performance and photoluminescent properties of them were also investigated. And the results show that complex 1 and 2 exhibited good photocatalytic activity towards the degradation of Rhodamine B (RhB) and Methylene Blue (MB) under visible light irradiation. Moreover, it is verified that the degradation rate fits the first-order kinetics.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Haitao Xiong,Mengyang Wang,Ruirui Qiang,Yingchun Wu,Xingwang Zheng
Photodeposited TiO 2 /Ag nanocomposites were generally used to be a friendly catalyst for degrading organic contaminant in environmental field. However, electrochemiluminescence (ECL) sensing analysis based on photocatalysts remains a significant challenge. Herein, polyvinylimide (PEI)-TiO 2 /Ag nanocomposites (PEI-TiO 2 /AgNCPs) film with reduced graphene oxide(r-GO) was constructed as a sensing interface for copper(II) ECL detection. TiO 2 /Ag nanocomposites was prepared by reversed phase microemulsion method and photodeposition technique. Moreover, it was discovered that a small amount of Cu 2+ could obviously boost the ECL signal of ninhydrin-hydrogen peroxide system. Signal amplification was achieved by using the synergistic effect between r-GO and TiO 2 /Ag nanocomposites, and the efficiently concentrated effect of PEI to Cu 2+ . Furthermore, the investigation showed that ECL mechanism of ninhydrin-hydrogen peroxide system was attributed to the generated hydroxyl radical and superoxide anion during the several type of reactions. Thus for the first time, an ultrasensitive ECL approach for detecting Cu 2+ could be performed using ninhydrin as an ECL signal probe and hydrogen peroxide as a co-reaction reagent. Under the suitable circumstances, the proposed method showed an excellent linear relationship in the concentration range of Cu 2+ from 1.0 fM to 5.0 nM. Detection limit was estimated to be as low as 0.26 fM. The sensing interface expanded the application of photodeposited TiO 2 /Ag nanocomposites in ultrasensitive ECL detection. It has potential applications in other components and biological analysis.
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Water
·
2025
·Vol. 17
·期 2
·155
·
IF 3
Yuanyuan Shi,Yi Xie,Jun Xia,Xiaolin Zhang,Hui Cheng,Jialin Chen
Ubiquitous nitrate (NO3−) in groundwater sources is considered a hazard compound for human health. Photo-catalytic reduction by Ag-TiO2/formic acid/visible light represents an emerging method for NO3−removal without secondary pollution. In this contribution, the removal of NO3−by photo-catalytic reduction and the selectivity of N2were systematically investigated under varied conditions, including concentrations of Ag-TiO2, NO3−, and formic acid (HCOOH). The removal efficiency of NO3−reached 84.47%, 82.68% of which was converted to N2under the optimal conditions: NO3−at 50 mg-N/L, Ag-TiO2at 1.0 g/L, HCOOH at 20.05 mmol/L, and reaction time at 120 min. The removal of NO3−was enhanced mainly by CO2−rather than by photo-generated electrons or HCOO−. The results of this study indicated that the production of ·CO2−by Ag-TiO2and HCOOH under visible light catalysis can achieve efficient NO3−removal.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 19
·195710
·
IF 2.9
Hang Chen,Caiqin Han,Le Zhang,Ying Wu
A surface enhanced Raman scattering (SERS) substrate of porous rod-shaped ferric oxide (Fe2O3) combined with silver nanoparticles (Ag NPs) and black phosphorus (Fe2O3/Ag/BP) was fabricated to detect the persistent organic pollutants (POPs) at low concentration. The organic pollutant Rhodamine 6G (R6G) was used as the probe molecule to study the performances of Fe2O3/Ag/BP, and 4-chlorobiphenyl (PCB-3) was the target of detection. The limit of detection (LOD) of R6G based on this novel SERS substrate Fe2O3/Ag/BP was as low as 1.0 × 10−15 M, which was five orders of magnitude lower than that of Fe2O3/Ag (10−10 M). The enhancement factor (EF) of Fe2O3/Ag/BP was 6.44 × 108, which was 3.1 times higher than that of porous rod-shaped Fe2O3/Ag (2.08 × 108). The Raman signal of R6G based on Fe2O3/Ag/BP had a good homogeneity, and the relative standard deviation (RSD) of Raman signal intensities of R6G at 1643 cm−1 was only 5.97%. Furthermore, the Fe2O3/Ag/BP substrate exhibited a recyclability through the photocatalytic degradation of R6G. The LOD of PCB-3 based on Fe2O3/Ag/BP was 10−9 M. Besides, Fe2O3/Ag/BP had a high SERS activity even it was kept in a centrifuge tube without requiring complicated treatment. These results highlight the potential application of Fe2O3/Ag/BP for ultra-trace detection of POPs in the environment.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Rongze Ma,Dedan Mu,Yanni Lang,Liang Xu,Haoxin Wang,Songtao Li,Yongjin Li,Zhiguo Song,Dacheng Zhou,Yong Yang,Yugeng Wen,jin han,Jianbei Qiu
Chiral materials that possess circularly polarized luminescence (CPL) functionality along with up- and down-conversion luminescence properties present promising research opportunities. However, achieving materials that simultaneously exhibit high luminescence emission efficiency across the visible to near-infrared range while also demonstrating CPL activity remains a significant challenge. Here, we achieve a significant enhancement of luminescence from the visible to near-infrared range as well as modulation of upconversion circularly polarized luminescence (Up-CPL) through the resonant coupling of silver nanoparticles with chiral nanoparticles. Our results show that silver nanoparticles excited by 980 nm light generate localized surface plasmon resonance (LSPR), creating a concentrated electromagnetic field at their surface. The electromagnetic field interacts with the chiral material, amplifying the strength of the chiral field, hereby enhancing the intensity of luminescence from the visible to near-infrared. This study presents a novel approach for enhancing visible to near-infrared luminescence intensity and realizing circularly polarized luminescence by using rare-earth-doped chiral inorganic materials coupled with Ag nanoparticles.
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ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Junlong Zhang,Jie Wei,Jianting Li,Minchuan Xiahou,Zehao Sun,Ao Cao,Youxin Yuanfeng,Guogang Chen,Yanchun He
The indiscriminate discharge of micropollutants ( e.g. , dyes, antibiotics, industrial additives, etc .) represents a significant risk to human health, and the removal of these substances from water bodies has become a prominent area of research within the field of environmental remediation. A simple hydrothermal-precipitation-photoreduction method was employed to synthesize novel Z-scheme heterojunction photocatalysts of AgBr/CoWO 4 /Ag. The catalysts demonstrated remarkable degradation capabilities with regard to a range of micropollutants present in wastewater. Of the catalysts tested, 5AgBr/CoWO 4 /Ag exhibited the highest degradation rates, reaching 98.58% for Rhodamine B, 86.82% for tetracycline hydrochloride, and 95.60% for 2-mercaptobenzothiazole within 60 min. In particular, the reaction kinetic rate of 5AgBr/CoWO 4 /Ag towards Rhodamine B degradation ( k 2 = 0.26278 L mg −1 ·min −1 ) is 9 times that of AgBr ( k 2 = 0.02953 L mg −1 ·min −1 ) and 113 times that of CoWO 4 ( k 2 = 0.00233 L mg −1 ·min −1 ), which serves to highlight the exceptional photocatalytic activity of the material. The experimental data and subsequent analysis indicated that the enhanced photocatalytic performance can be attributed to two factors: firstly, the electron mediation by Ag nanoparticles leading to improved charge separation efficiency, and secondly, the formation of Z-scheme heterojunctions between AgBr and CoWO 4 . The cyclic tests provided confirmation of the excellent stability and recyclability of the AgBr/CoWO 4 /Ag photocatalysts. It is anticipated that this study will facilitate the development of novel methods for the degradation of refractory micropollutants and provide insights into environmental remediation, thereby contributing to the sustainable development of society.
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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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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xu Zhang,Li Tong,Xiahui Shi,Zhaosheng Li,Zhaohui Xiao,Yipu Liu,Tao Zhang,Shiwei Lin
The demand for clean energy sources has driven focus towards advanced electrochemical systems. However, the sluggish kinetics of the oxygen evolution reaction (OER) constrain the energy conversion efficiency of relevant devices. Herein, a one-step method is reported to grow oxygen vacancies (V o ) rich NiFeAg layered double hydroxides nanoclusters on carbon cloth (V o -NiFeAg-LDH/CC) for serving as the self-supporting electrode to catalyze OER. The OER performance of V o -NiFeAg-LDH/CC has been remarkably enhanced through Ag and V o co-modification compared with pristine NiFe-LDH, achieving a low Tafel slope of 49.7 mV dec −1 in 1 m KOH solution. Additionally, the current density of V o -NiFeAg-LDH/CC is 3.23 times higher than that of the state-of-art IrO 2 at 2 V under an alkaline flow electrolyzer setup. Theoretical calculations and experimental results collectively demonstrate that Ag dopant and V o strengthen the O* adsorption with active sites, further promoting the deprotonation step from OH* to O* and accelerating the catalytic reaction. In a word, this work clarifies the structural correlation and synergistic mechanism of Ag dopant and V o , providing valuable insights for the rational design of catalyst for renewable energy applications.
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