ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 30
·46200-46213
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IF 5.19
Wang Yaqiao,Xia Xunfeng,Gao Shengwang,Zhao Xingpeng,Wang Guoying,Han Xue
A novel Ag/BiOBr/CeO 2 composite was successfully prepared for the first time, which had excellent performance in degrading sulfisoxazole (SSX) under visible light irradiation. The as-prepared samples were characterized by SEM, XRD, UV–vis DRS and BET et al. The composite of 10% Ag/BiOBr/CeO 2 showed the best photocatalytic activity and more than 99.5% SSX can be removed within 20 min. It exhibited the highest k value of 0.2428 min −1 , which was about 39.7 times higher than pure BiOBr (6.11 × 10 −3 min −1 ) and 22.1 times higher than BiOBr/CeO 2 (1.09 × 10 −2 min −1 ), respectively. The addition of Ag significantly improved the absorption rate of visible light and the separation rate of photogenerated electron–hole pairs. The initial pH and dosage of samples could have an influence on the photocatalytic activity. The radical trapping experiments proved that · O 2 − and h + were the main active species involved in photocatalytic degradation. Finally, the synthesized catalyst maintained excellent photocatalytic activity after 5 repeated cycles, which indicated the extraordinary stability and recyclability of Ag/BiOBr/CeO 2 . Graphical abstract
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2022
·
IF 4.889
Kun Wang,Xun Zhu,Rong Chen,Dingding Ye,Yang Yang,Qiang Liao
In this work, Ag nanoparticles as surface plasmon catalysts were prepared on polydopamine microspheres via in-situ reduction for catalytic 4-nitrophenol to 4-aminophenol in the presence of sodium borohydride. The kinetics of catalytic reaction under light and dark conditions was compared. It was found that the reaction rate constant under light condition was increased by 53.6% due to the surface plasmon resonance effect. The transition state theory was used to reveal the enhanced mechanism of catalytic conversion of 4-nitrophenol under light condition. It is demonstrated that the light-excited high-energy electrons are responsible for the shift of the adsorbed reactants to the excited state with higher potential energy, lowering the apparent activation energy from 47.2 kJ/mol to 32.6 kJ/mol and thereby enhancing the conversion of 4-nitrophenol to 4-aminophenol. This study offers a deep insight into the contribution of surface plasmon resonance to catalytic conversion of 4-nitrophenol by surface plasmon catalysts.
研究领域:
化学
·
材料科学
·
光催化
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DOI
高影响因子
Journal of the American Chemical Society
·
2018
·
IF 14.357
Long Lin,Min Chen,Haiyan Qin,Xiaogang Peng
Though Ag nanocrystals are predicted to be the best material for localized surface plasmon resonances (LSPR) in the visible light region, realization of their ideal LSPR properties is hindered by the stringent requirements: i.e., simultaneous control of their size, shape, crystallinity, and surface structure. To achieve this goal, a synthetic scheme in non-polar solvent coupled with mild oxidative etching by H+ ions has been established. With a trace amount of Cl– ions as catalysts, H+ ions (in the form of carboxylic acids) become active for selectively etching the nuclei (and small nanocrystals) with imperfect crystal structure, which results in a new growth mechanism for formation of monodisperse nanocrystals, namely “self-focusing of size/crystallinity distribution”. H+ ions, ligands, and other reagents in the scheme are confirmed to possess negligible effects on the surface dielectric properties of Ag nanocrystals. To eliminate radiative damping of LSPR, single-crystalline and monodisperse spherical Ag nanocrystals in the size range between 7 and 20 nm are synthesized using this one-pot scheme. With excellent control of all related structural parameters, the full width at half-maximum of LSPR spectra of single-crystalline Ag nanocrystals match theoretical predictions in the entire size range, and the maximum quality factor (∼20) of LSPR predicted by theory is realized. The Raman enhancement factor of the single-crystalline Ag nanocrystals for crystal violet (excitation at 514 nm) is 5 times higher than that of the typical multi-twinned nanocrystals with the same size.
研究领域:
材料科学
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纳米技术
·
光学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 7
·期 15
·8832-8844
·
IF 9.931
Yunlong Guo,Da-Peng Yang,Minghuan Liu,Xiaoyan Zhang,Yisong Chen,Jiale Huang,Qingbiao Li,Rafael Luque
Catalytic oxidation plays a key role in transforming gaseous benzene into harmless matter, in which it is essential to look for a low-cost, environmentally friendly and efficient green catalyst/support. Herein, Ag nanoparticle (Ag NP) loaded-eggshell catalysts were successfully synthesized by a simple impregnation method, in which waste eggshells were used as an efficient template and catalyst support. SEM, XRD and ICP-OES results show that a different number of Ag NPs are uniformly distributed on the surface of eggshells, which are defined as Ag1/eggshell (10.8%), Ag2/eggshell (19.9%) and Ag3/eggshell (34.3%) catalysts according to the amounts of loaded Ag NPs. Then, the activity between the three catalysts and the pure Ag NPs was assessed based on the catalytic oxidation of benzene. Our results show that the Ag NP loaded-eggshell catalysts exhibit superior catalytic activity compared with the pure Ag NPs. Considering the balance between the cost and catalytic performance, the Ag2/eggshell catalyst was selected as the optimum research object in the subsequent work. The Ag2/eggshell catalyst calcined at 500 °C exhibited excellent catalytic activity, which is assigned to the unique channel structure of eggshell, good low-temperature reducibility, and high dispersion of particles (sizes effects) on the surface of eggshell as well as the synergetic interaction between the Ag NPs and eggshell. Furthermore, the Ag2/eggshell catalyst exhibited predominant stability even after 200 h of on-stream reaction. The reaction mechanism is put forward based on the in situ FTIR experimental results, in which some carboxylate intermediate species are confirmed. Accordingly, the waste eggshell is considered as a promising supporting material for the large-scale synthesis of noble metal catalyst with high catalytic performance and stability for VOC oxidation.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 6
·1-10
·
IF 6.408
Xia Dacheng,Jiang Panpan,Cai Zhiwei,Zhou Rui,Tu Bo,Gao Nan,Chang Gang,He Hanping,He Yunbin
A new approach is presented to fabricate flexible surface-enhanced Raman scattering (SERS) substrate of Ag nanocubes monolayer-modified polydimethylsiloxane (Ag NCs/PDMS) through a powerful three-phase interface self-assemble method. The morphologies and crystal structures were characterized by scanning electron microscopy and X-ray diffraction. The self-assembled Ag NCs/PDMS substrate exhibited high SERS activity and good signal homogeneity, which was successfully used for quantitative detection of thiram; the detection limit reached 10 ng/mL, and the linear range is 10–1000 ng/mL. Furthermore, the flexible SERS substrates were successfully employed to detect thiram residues on factual apple samples, and trace amount (1 ng/cm 2 ) of thiram residues was detected on apple peels. The excellent SERS detection ability of self-assembled Ag NCs/PDMS substrate indicated that it will play an important role in pesticide detection in the future. Graphical abstract
研究领域:
材料科学
·
分析化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Kai Chen,Shengrong Yuan,Jinze Li,Yan Zhang,Fengfeng Chen,Dongming Qi
The bacterial infection and its transmission pose a great threat to life and health, which leads to the urgent development of efficient and broad-spectrum antibacterial agents. Herein, Ag/lignin layered nanoflower (Ag/EHL-CM-0.05) was synthesized by using biomass lignin as reducing and capping agents and silver nitrate as precursor. The study showed that the size distribution of Ag NPs was uniform distribution and about 20–40 nm. The crystal surface of Ag NPs was Ag (111) surface. The minimum inhibitory concentration of Ag/EHL-CM-0.05 against E. coli and S. aureus was all 7.8 μg/mL, which was the lowest of other Ag/lignin antibacterial materials and reached a level nearly as polycationic antibacterial agents. The antibacterial mechanism suggested that Ag/EHL-CM-0.05 could release OH and Ag + , which could cause bacterial death. Finally, Ag/EHL-CM-0.05 was sprayed onto the viscose fabrics by liquid-phase spray deposition method. It was found that the inhibition zone diameter of modified viscose fabrics against E. coli and S. aureus only dropped about 0.16 cm on average after friction treatment and 0.32 cm on average after washing treatment. This work provides a new idea for the design and synthesize of efficient, broad-spectrum, and bio-compatible antibacterial agents, which has important social, economic, and environmental significance.
研究领域:
材料科学
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生物学
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医学
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DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 48
·41696-41706
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IF 3.289
Guangyan Tian,Wenbo Wang,Li Zong,Yuru Kang,Aiqin Wang
Palygorskite (PAL) has been widely used for adsorption removal of dyes from wastewater, but the dye-loaded PAL is usually discharged as solid waste because it is hardly regeneratable by conventional elution processes. As the aim was to efficiently utilize the dye-loaded PAL waste, we employed a facile one-pot hydrothermal process to transform the spent methyl violet (MV)-loaded PAL into multifunctional ternary palygorskite/carbon/Ag nanoparticles (PAL/C/AgNPs) nanocomposites in the assistance of AgNO3. The MV-loaded PAL serves as a carbon precursor, reducer of Ag(I) and supporter of the in situ formed AgNPs. Structure characterizations confirmed that the MV dye was transformed into carbon species, and AgNPs were formed on the PAL with good dispersion, and the addition of Ag(I) ions promoted carbonization of the MV molecules. The as-prepared nanocomposites exhibited excellent adsorption and catalytic performance. Adsorption evaluation showed that the nanocomposite prepared at 5 mass% of AgNO3 dosage gives the best adsorption properties, and 99.2% of methylene blue (MB), 86.9% of MV, 68.7% of chlortetracycline hydrochloride (CTC) and 46.2% of tetracyclines (TC) were rapidly removed from 100 mg L−1 of the aqueous solution using 0.5 g L−1 of the adsorbent. The removal ratio increased with increasing dosage of adsorbent, and the minimum usage amounts of adsorbent for the thorough removal of MB, MV, CTC and TC molecules were 1.0 g L−1, 1.2 g L−1, 3.5 g L−1 and 4.5 g L−1, respectively. Moreover, the nanocomposites could rapidly catalyze the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 6.5 min with a catalytic rate constant of 0.0120 s−1, and the catalytic activity is still retained after 8 cycles of reuse. In addition, the nanocomposite can be re-generated into new adsorbents by the same hydrothermal process after adsorption of organic matters, which open a new sustainable avenue to efficiently utilize waste dye-loaded PAL and develop new adsorption and catalysis materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Sanjun Yang,Qiming Liu
An aligned Ag nanowire array was directly synthesized by galvanic replacement on curved poly(ethylene terephthalate) (PET) by using a Cu2O microcrystal as a reductant. A more orderly aligned nanowire array was obtained when the curvature radius was reduced. A second growth with different orientation produced Ag nanowire networks. The guided growth was also achieved when using Zn as a reductant or polystyrene as a substrate. This plain method with facile control over the orientation and density of the Ag nanowire array enriches the grow-in-place methodology and can potentially be applied to various fields.
研究领域:
材料科学
·
纳米技术
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DOI
PubMed
高影响因子
Nanotechnology Reviews
·
2020
·Vol. 9
·期 1
·568-579
·
IF 3.639
Cheng Hu,Lina Wu,Changchun Zhou,Huan Sun,Peng Gao,Xiujuan Xu,Chenxi Zhang,Jie Liang,Yujiang Fan,Jianxun Sun,Xuedong Zhou,Xingdong Zhang
In the past decade, biomimetic calcium phosphate (CaP) ceramics have been considered as practicable grafts and biomaterial substitutes in repairing jaw bone defect after tumor resection or traffic accident. Nowadays, increasing incidence of biomedical material-associated infection has raised a concern when applying these materials. In this work, a new porous CaP scaffold with antibacterial coating was proposed. This biomimetic scaffold was composited with berberine (BBR), Ag nanoparticles (nAg), and silk fibroin (SF). The microstructures and phase composition of the scaffolds were analyzed. The cytocompatibility and osteogenic potential of the prepared samples were evaluated in vitro . The scaffolds held hierarchical structure: the first-level porous CaP ceramic with micron pores ranged from 250 to 600 µm; the second-level spongy-like structure with abundant capillary pores ranged from 500 nm to 10 µm; and the third-level structure was achieved by filling BBR, nAg, and SF gel coatings into the above porous structures. The experimental results showed that the antimicrobial capability of single BBR coating is inconspicuous. However, the introduction of nAg could significantly promote the antibacterial effect of scaffolds. At the same time, such scaffolds showed improved osteoinductivity. This new biomimetic CaP scaffold with antibacterial and osteoinductive properties may be a promising candidate for bone tissue engineering.
研究领域:
生物医学工程
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材料科学
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组织工程
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生物材料
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DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Obeng Enoch,Feng Jiayao,Wang Danyan,Zheng Dongyang,Xiang Bailin,Shen Jianliang
To overcome the limitations of traditional therapeutics, nanotechnology offers a synergistic therapeutic approach for the treatment of bacterial infection and biofilms that has attracted attention. Herein, we report on a ZnO@Ag nanocomposite with good biocompatibility synthesized by doping ZnO NPs with silver nanoparticles (Ag NPs). ZnO@Ag nanocomposites were synthesized with varying ratios of Ag NPs (0.5%, 2%, 8%). Under the same experimental conditions, ZnO@8%Ag exhibited outstanding properties compared to the other nanocomposites and the pristine ZnO NPs. ZnO@8%Ag demonstrated excellent photothermal and photodynamic properties. Also, ZnO@8%Ag demonstrated over 99% inhibition of Staphylococcus aureus (S. aureus) under photothermal therapy (PTT) or photodynamics therapy (PDT) as a result of the excessive generation of reactive oxygen species (ROS) by the Ag+ released, while the pristine ZnO showed an insignificant inhibition rate compared to the PBS group (control). Furthermore, ZnO@8%Ag completely disrupted S. aureus biofilm under a combined PTT/PDT treatment, a synergetic trimodal therapy, although the molecular mechanism of biofilm inhibition remains unclear. Hence, the excellent photothermal, photodynamic, biocompatibility, and bactericidal properties of ZnO@8%Ag present it as an appropriate platform for bacterial and biofilm treatment or other biomedically related applications.
研究领域:
纳米技术
·
细菌感染
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治疗诊断学
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生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Pu Chen,Dong Li,Yuan Feng,Shijie Zhou,Jing Tang,Bowen Chu,Dongsheng Tang,Jiawen Hu
A flexible Ag NWs/WO 3- x /Au memristor is successfully fabricated. • The device achieves an ultra-low energy consumption of 3.89 fJ per pulse. • The device achieves a competitive ECG recognition accuracy of 94.3%. • The device exhibits robust mechanical flexibility. The simultaneous achievement of high mechanical flexibility, ultra-low energy consumption, and high recognition accuracy remains a major challenge for wearable intelligent devices. Here, we report a flexible memristive device capable of emulating biological synaptic functions, fabricated with a spin-coated flexible Ag nanowire (NW) bottom electrode, an electrodeposited conformal WO 3- x coating as the functional layer, and an evaporation-defined Au top electrode. With a stacked Ag NWs/WO 3- x /Au architecture and strong interfacial bonding from the conformal coating, the device exhibits robust mechanical flexibility and cycling stability. Notably, the device achieves an ultra-low average energy consumption of merely 3.89 fJ per spike, attributed to the electrodeposition process that generates abundant short-range continuous oxygen vacancies, which shorten the ion migration path and lower the diffusion barrier, thereby enabling conductive filament formation at low voltages. When applied to electrocardiogram (ECG) signal recognition, the device achieves an accuracy of 94.3%, with negligible performance degradation after 2000 bending cycles, underscoring its robust flexibility. These advantages position this memristor as a promising building block for wearable ECG monitoring systems. Download: Download high-res image (221KB) Download: Download full-size image
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产品关联
DOI
高影响因子
NANO
·
2026
·
IF 1.3
Zhida Yang,Wenkai Wang,Binbin Gao,Tianzi Xu,Dongxue Zhou,Rongjie Li,Wei Liu,Honglu Liang,Guangsheng Dong,Hongzhi Yuan,Wenjun Dong,Honglin Chen
The Cu@Ag core-shell particles can be employed as conductive phase in conductor paste. Ag shell is designed to protect Cu core from oxidation. To obtain thin, dense and uniform Ag shell on Cu core, a novel electroless Ag plating process for Ag coating is developed. In the process, acacia gum (AG) acts as surfactant and dispersant, manipulating Ag deposition on Cu slowly and accurately. Benefit from the reduction potential difference between Ag and Cu, a thin reduced Ag shell is plated on Cu core with layer growth mode firstly. Then, inhomogeneous surface energy of Ag shell commands its following growth with an island mode. Finally, these Ag islands grow to contact and bond together, resulting in an uniform and dense Ag shell for Cu@Ag. After optimization, the Cu@Ag particle shows excellent oxidation resistant. A mass increase of only 0.5% is observed in it at 300°C. Meanwhile, the Cu@Ag with regular structure also presents remarkable volume conductivity. Over all, the spectacular performance of prepared Cu@Ag powder indicates its promising application in conductive paste.
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DOI
PubMed
高影响因子
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