ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Aimei Hong,Qing Tang,Ashfeen Ubaid Khan,Maozhong Miao,Zhenlan Xu,Fei Dang,Qian Liu,Yawei Wang,Daohui Lin,Juliane Filser,Lingxiangyu Li
Nanoscale silver (n-Ag) including silver nanoparticles (Ag-NPs), silver chloride nanoparticles (AgCl-NPs), and silver sulfide nanoparticles (Ag2S-NPs) and their corresponding ionic counterpart, namely, dissolved Ag, may coexist in soils. X-ray absorption near edge spectroscopy (XANES) is used to elucidate the speciation of n-Ag in soils, whereas it possesses drawbacks like high costs, rare availability of the instrument, and providing semiquantitative data. We developed a new method for the identification and speciation of n-Ag in soils and sediments based on a sequential extraction technique coupled with inductively coupled plasma optical emission spectrometry. Extraction conditions were first evaluated, establishing the optimal extraction procedure; Ag-NPs, AgCl-NPs, and dissolved Ag in soil were simultaneously extracted by using an aqueous solution of 10 mM tetrasodium pyrophosphate, followed by selective isolation and quantification via AgCl-NPs dissolution (4.45 M aqueous ammonia), centrifugation (Ag-NPs), and detection. The Ag2S-NPs remaining in the soil were then extracted with Na2S solution at pH 7.0 through selective complexation. Optimal recoveries of Ag-NPs, AgCl-NPs, Ag2S-NPs, and dissolved Ag were 99.1 ± 2.4%, 112.0 ± 3.4%, 96.4 ± 4.0%, and 112.2 ± 4.1%, respectively. The method was validated to investigate the speciation of n-Ag in soils and sediments, exhibiting the distribution of Ag-NPs, AgCl-NPs, Ag2S-NPs, and dissolved Ag in each sample, wherein Ag2S-NPs, the major species of n-Ag, accounted for 35.42–68.87% of the total Ag. The results of n-Ag speciation in soil are comparable to those obtained through the linear combination fitting of XANES. This method thus is a powerful, yet convenient, substitute for XANES to understand the speciation of n-Ag in complex solid matrices.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xuejiao Liu,Qingxin Xu,Zhiwei Li,Beibei Pan,Pamphile Ndagijimana,Yin Wang
Cationic heavy metals (Pb 2+ , Cu 2+ , Zn 2+ , Cd 2+ ) and arsenic contamination are generally found in water. Therefore, the development of a versatile method of removing cationic heavy metals and arsenic from water is indispensable. Herein, an activated carbon-supported nanoscale zero-valent iron and nanosilver composite (nAg/nZVI/AC) at ultralow content (1.539 ± 0.039 % of Fe and 0.162 ± 0.004 % of Ag) was synthesized, followed by characterization of its properties by several techniques, such as XRD , SEM–EDS, HRTEM , Raman spectroscopy , nitrogen adsorption-desorption isotherm experiments and XPS. Its reactivity was evaluated by removing cationic heavy metals and arsenic from water and then analyzing the interfacial behavior and mechanisms. The results showed that crystalline nanosilver (20–30 nm) and amorphous nZVI (10–20 nm) were uniformly immobilized on AC. The surfaces of nZVI and nAg in the fresh composite were mainly composed of γ-FeOOH and AgO, respectively. The nAg/nZVI/AC displayed synergetic adsorption behavior between AC and supported nAg/nZVI and simultaneously enhanced the efficiency of the removal of cationic heavy metals and arsenic. The composite was stable and durable. Most Cu 2+ , Pb 2+ , Cd 2+ , and Zn 2+ transformed into Cu 0 , CuO , Pb 0 , CdCO 3 , and ZnO by means of adsorption, precipitation, and reduction at the cathode (nAg), while Ag 2 O. AsO 4 3– and AsO 3 3– were reduced to As 0 and As 3+ at the anode (nZVI), where Fe 0 , Fe 2+ (i.e., FeO), and Fe 3+ (i.e., FeOOH, Fe 2 O 3 ) were also present. No obvious competition between multiple-component heavy metals was observed. nAg/nZVI/AC has much potential to be used in the purification of water contaminated with cationic heavy metals and arsenic.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Coatings
·
2019
·Vol. 9
·期 5
·325
·
IF 2.33
Qiujin Wang,Yifan Zhou,Jixue Zhou,Rongrong Wu,Jianbo Wu,Hao Zheng,Ying Ye,Yuanfeng Huang
In this paper, we successfully fabricated a novel bromide ion selective electrode (Br-ISE), which was coated by bromine ion doped polyaniline as sensitive film. Using Ag wire as the substrate, a uniform and dense nano-silver layer was electroplated to enhance the specific surface area of the electrode. Subsequently, a polyaniline (PANI) film was coated onto the electrode by cyclic voltammetry in a 0.3 M aniline and 1 M HCl solution and was in-situ doped by 0.1 M KBr solution. The morphology and performance of the electrode were characterized by scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and other electrochemical analysis methods, respectively. The prepared Br-ISE exhibited a wide linear dynamic range between 1.0 × 10−1and 1.0 × 10−7M with a near-Nernst slope of 57.33 mV/decade. In addition, the electrode possessed extremely fast response time (<1 s) and low impedance (300 Ω), high sensitivity, and good selectivity. The electrode potential drifted within 2 mV in 8 h. The lifespan was larger than three months.Keywords:nano-silver;electrode;bromide ion doped PANI;film;in-situ measurement
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Yingying Sheng,Yifu Zhu,María Luisa Cerón,Yufu Yi,Peng Liu,Peng Wang,Ting Xue,María Belén Camarada,Yangping Wen
Nanozyme based on the silver nanoparticles (AgNPs) decorated highly water-oxygen stable phosphorene (BP) nanohybrid with phosphorus-doped porous carbon microspheres (P-PCMs) is applied as an intelligent sensing platform for the electrochemical detection of 8-hydroxy-2′-deoxyguanosine (8-OHdG) as a biomarker of oxidative DNA damage in human urine sample. The density functional theory (DFT) is use for investigating the effect of silver on the conductivity level of BP and discussing a possible mechanism for the electrocatalytic oxidation of 8-OHdG. The Ag + is in-situ reduced as AgNPs that grows onto the BP surface for the controllable preparation of BP-AgNPs with effective surface passivation among different metal ions decorated BP. P-PCMs with 4.9-fold enhancement in specific surface area (1636.73 m 2 g −1 ) are prepared by hydrothermal carbonization of α-cyclodextrin as carbon sources, then calcinate in the presence of phosphoric acid as an activator and dopant. P-PCMs-BP-AgNPs are prepared by the ultrasound-assisted liquid-phase exfoliation with the addition of Ag + , and both P-PCMs and black phosphorus crystals are sufficiently grinded. The P-PCMs-BP-AgNPs nanohybrid displays good long-term water-oxygen stability, extraordinary specific surface area, superior electrocatalytic capacity with 303-fold enhancement, enzyme-like characteristics with I max of 100 μA and K m of 29 μM. The machine learning (ML) model with artificial neural network (ANN) algorithm is employed for the intelligent output of 8-OHdG in real sample with acceptable recovery in work range from 0.2 to 125 μM.
研究领域:
生物医学工程
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Nanomaterials
·
2022
·
IF 3.791
Xiaohui Peng,Dai Gong
The study aim reports a new umbilical cord wound repair material based on modified chitosan-based nanosilver (CS-HDH/Ag NPs). The repair of umbilical cord wound has always been the focus of neonatal departments. The study method chitosan, which is famous for its “biological glue,” is used as a modifier to compound silver nanoparticles with strong coordination and adsorption capacity of chitosan. It is worth noting that CS-HDH/Ag NPs has a significant inhibitory effect on common bacterial infection and reduces the incidence of umbilical cord wound inflammation. The study problem wound bleeding and stump shedding and other factors make the periumbilical cord vulnerable to bacterial infection. For study results, the porous and lamellar structure endows the repair material with breathable properties and excellent antiadhesion, which greatly reduces the number of dressing changes and effectively protects the skin of newborns. CS-HDH/Ag NPs provides a new model for efficient neonatal health management.
研究领域:
医学材料学
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微生物学
·
儿科
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2017
·
IF 2.589
Mengjiao Zhai,Yongfeng Gong,Xiuyong Chen,Tonghu Xiao,Guoping Zhang,Lianghao Xu,Hua Li
To exploit marine metal materials with antifouling and drag reduction properties, we constructed hydrophobic perfluoroalkoxy (PFA)/nano‑silver (Ag) coatings onto aluminum substrates by suspension flame spray deposition of PFA/AgNO 3 composites. Silver nanoparticles were formed in situ within PFA coating during the suspension flame spraying. The successful construction of PFA/nano-Ag coatings was revealed by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and contact angle measurements, respectively. The additional silver nanoparticles play the significant role in regulating the sliding angle of the PFA-based coatings. The silver nanoparticles-loaded hydrophobic PFA coatings synergistically inhibited the adhesion of bacteria, while only PFA coatings with lower content of silver display drag reduction property. The simple and cost-effective approach is of great promise in mass-production of antifoulant-loaded hydrophobic coatings on general substrates for potential antifouling and drag reduction applications.
研究领域:
材料科学
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海洋工程
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2021
·Vol. 13
·期 21
·3004
·
IF 3.103
Xin Wang,Huafeng Chen,Jianyu Wang,Yi Zhou,Changzheng Cui,Yanbo Zhou
Water pollution caused by organic pollutants and pathogenic microorganism is a critical issue. In this study, we reported a silver-modified β-cyclodextrin polymer (CD-CA/PDA-Ag) used for the removal of dyes and the suppression of microorganisms from water. In order to avoid silver nanoparticles agglomeration, the material was first coated with polydopamine (PDA) on β-cyclodextrin matrix, whose reducing catechol groups subsequently immobilized silver ions in situ to form uniformly dispersed silver nanoparticles. CD-CA/PDA-0.5Ag displayed a high adsorption capacity of methylene blue (535.93 mg/g), which is mainly attributed to electrostatic interactions, host-guest inclusions and π-π bond stacking effects. Furthermore, both diffusion inhibition zone tests and colony formation unit tests were investigated, which showed excellent antimicrobial capability onEscherichia coli(E. coli) andStaphylococcus aureus(S. auerus). Overall, CD-CA/PDA-Ag proved to have an excellent adsorption capacity and antibacterial performance, which provides a great potential in water purification.Keywords:cyclodextrin polymer;adsorption;antibacterial;polydopamine;nano-silver
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Central South University
·
2020
·Vol. 26
·期 11
·2953-2960
·
IF 1.249
Liu Piao,He Wen-qiang,Lu An-xian
Finer nanoplates of silver are prepared by self-assembly on the surface of graphene, and the low-temperature sintered high conductivity ink containing the silver nanoplates is prepared. Most importantly, graphene is added to the solution before the chemical reduction reaction occurs. Firstly, it is found that silver nanoplates have self-assembly phenomenon on the surface of graphene. Secondly, the Ag nano hexagonal platelets (AgNHPs) with small particle sizes (10 nm), narrow distribution and good dispersion are prepared. Especially, smaller sizes (10 nm) and narrower particle size distribution of AgNHPs particles can be easily controlled by using this process. Finally, the conductivity of the ink is excellent. For example, when the printed patterns were sintering at 150 °C, the resistivity of the ink(GE: 0.15 g/L) reached the minimum value of 2.2×10 −6 Ω·cm. And the resistivity value was 3.7×10 −6 Qcm, when it was sintered at 100 °C for 30 min. The conductive ink prepared can be used for the field of printing electronics as ink-jet printing ink.
研究领域:
材料科学
·
印刷电子学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xiaojiang Chen,Lielin Wang,Congcong Ding,Hua Xie,Hao Zou,Jiaming Deng,Zhu Liu,Junping Shi,Yun Ding
Radioactive iodine anion wastewater is generated during the operation of nuclear facilities. Efficiently adsorbing and removing radioactive iodine is crucial for the sustainable development of nuclear energy. A potential adsorbent, nano silver-loaded activated carbon fiber (Ag@ACF), was prepared through hydrothermal synthesis and high-temperature vacuum reduction for the efficient removal of iodide anions. The as-prepared Ag@ACF composite has been comprehensively characterized, with silver nanoparticles uniformly distributed on the surface and pore walls of the Ag@ACF, enhancing the adsorption sites for iodine anions. The adsorption performance of Ag@ACF towards iodine anions was evaluated through column and batch experiments, varying silver concentration, adsorbent dosage, pH, contact time, and competing anions. Ag@ACF demonstrated high water stability and a low desorption rate of iodine anions. At a pH of 2, Ag@ACF exhibited a maximum adsorption capacity for iodine anions of 372 mg/g, surpassing most other adsorbents and showing promise for engineering applications. Adsorption kinetics and isotherm analysis indicated that the adsorption process of Ag@ACF primarily involved monolayer homogeneous chemisorption, resulting in the formation of stable AgI. These results suggest that Ag@ACF could serve as a potential adsorbent for removing iodine from radioactive wastewater.
研究领域:
环境科学
·
核能工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Sustainability
·
2022
·
IF 7.244
J. Liang,Z. Wang,Q. Ye,L. Qiao,H. Jiang,Y. Guo,Z. Fan
Melt-blown fabric masks have the drawbacks of the supply-demand imbalance, the risks of respirable infection, and environmental pollution . Therefore, it is urgently needed to exploit a new mask material with excellent air-filtration, antimicrobial, and degradable properties. In this study, a new sodium alginate (SA)/nanosilver composite mask intermediate filter layer (named as SAg air filter) is prepared by a simple and quantifiable pumping-injecting method to substitute the traditional melt-blown fabric. Subsequently, the prepared SAg air filter is softened with glycerol solution to improve the flexibility. Compared with the intermediate filter layer of the melt-blown fabric mask, the SAg air filter has more excellent performances, such as environmental friendliness, degradability , large-scale preparation, stable and long-lasting air filtration , good impermeability, as well as suitable breathability. What's more, the air filter combines physical and mechanical filtration, Coulomb adsorption of nano-silver, and antimicrobial air purification through the SAg aerogel network to ensure more comprehensive air purification and filtration. The novel SAg air filter will have a broad application prospect in the mask market, and eventually extend the new application of SA aerogel in the air filtration field.
研究领域:
材料科学
·
医学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 6
·5526-5535
·
IF 2.195
Yang Fan,Hu Bo,Peng Ye,Hang Chunjin,Chen Hongtao,Lee Changwoo,Wei Jun,Li Mingyu
A silver (Ag) composite paste was fabricated based on Ag nanoparticles (NPs) and Ag microflakes (MFs). Robust interconnections were achieved after sintering in the temperature range of 150–225 °C. The shear strengths of the Ag MF + NP joints before and after thermal shock from − 50 to 150 °C for 1000 cycles were 155.7 ± 14.5 MPa and 78.4 ± 20.8 Mpa, respectively. The results show that the Ag composite paste not only has similar sintering properties to the Ag NP pastes but also exhibited superior mechanical reliability due to the addition of the Ag MFs. In addition, the sintered properties of different Ag pastes were discussed in terms of the coating organics, thermal behaviour and microstructure. The fracture modes after the shearing tests were analysed in detail. The Ag composite paste provides a potential solution for high-temperature applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Chuge Zhang,Xiaowu Hu,Shikun Xiao,Wenxing Luo,Haozhong Wang,Xiongxin Jiang
In this paper, nano-Ag coated eggplant-based biological porous carbon (BPC) was used as the support material to load PEG to solve the problem of leakage and low thermal conductivity of phase change material (PCM). A series of support materials (caky BPC, caky BPC@Ag, BPC powders, BPC@Ag powders) were prepared. The results show that the shape-stabilized PCM (ss-PCM) obtained by caky BPC had better anti-leakage ability. The thermal conductivity of the support material coated with nano-Ag particles was increased by 40.9 % compared with the uncoated support material. After ten thermal cycles, the composite ss-PCM (ss-CPCM) remained to exhibited excellent thermal reliability, which indicated that the ss-CPCM supported by nano-Ag coated BPC had excellent potential in practical application. In addition, BPC@Ag improved the light-to-heat conversion rate and had more application prospects. In addition, BPC had a high photo-thermal conversion efficiency, and BPC@Ag further improved the photo-thermal conversion.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）