Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jingyu Pang,Linan Zhou,Zhuang Liang,Tingting Li,Rui Yan,Fang Chai
The determination of heavy metal ions is critical to both human health, ecosystems, and the environment because it is a prerequisite for separating heavy metal pollutants. Herein, a ratiometric fluorescent strategy based on bimetallic AuAg nanoclusters and Si nanoparticles (AuAg-SiNPs) was constructed and achieved multivariate detection of Ag + , Cu 2+ , and Hg 2+ , simultaneously. The AuAg-SiNPs exhibited dual emission centered at 456 nm and 631 nm, with quantum yield of 23.48 %, and presented visual distinguishable signal for different ions. Notably, a smartphone visual platform was created to identify Ag + , Cu 2+ , and Hg 2+ with portable and accurate capturing and recognizing changing RGB values. The quantitative evaluation can be confirmed by various noticeable ratiometric evolution responses to three ions, the limits of detection were 1.61 nM, 49.94 nM, and 1.44 nM for Ag + , Cu 2+ , and Hg 2+ , respectively. Excellent environmental tolerance as well as reliability and practicability of AuAg-SiNPs enabled their test in real water samples. The synergistic effect of aggregation-caused quenching, static quenching effect, internal filtration effect, and fluorescence resonance energy transfer were revealed in process of detection. Ratiometric fluorescent probes offer great advantages in multiple identification of heavy metals in real sample. Smartphone-assisted detection greatly improves the effectiveness of visual on-site detection and has a promising application in real samples.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2021
·Vol. 33
·期 9
·2016-2024
·
IF 3.223
Yongliang Guo,Lili Tian,Jiangming Wu,Yang Wu,Yongmei Liu,Jie Du,Xiaoquan Lu
In this study, we found that spermine (SPM) could enhance electrochemiluminescence (ECL) intensity of Au−Ag bimetallic nanoclusters (Au−Ag BNCs) with triethylamine (TEA) as a co-reactant. An ECL sensor was fabricated to detect SPM, which contained Au−Ag BNCs as ECL emitters and conductive hydrogel containing polyaniline-amino trimethylene phosphonic acid (PANI-ATMP) as an immobilizing matrix. The increased ECL intensity of SPM was linear with the logarithm of concentrations of SPM in the range of 1 pM to 10 μM with high selectivity, excellent stability, and the limit of detection is 0.11 pM (S/N=3). This sensor realized the detection of SPM in urine samples, which was fast and economic, possessing potential applications for SPM detection in clinical and bioanalysis.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Qiuzheng Du,Ziwei Jing,Hang Qi,Lihua Zuo,Lin Zhou,Hua He,Zhi Sun
The work described a new colorimetric sensor for the quantitative detection of clindamycin based on Au@Ag core–shell nanoparticles (Au@Ag NPs). The obtained Au@Ag NPs were characterized by transmission electron microscopy (TEM) and ultraviolet and visible spectrophotometry (UV–vis). When Au@Ag NPs were added to a clindamycin solution, it can be observed that the color immediately changed from bright yellow to gray-blue and the absorption spectrum also changed, realizing the visual detection of clindamycin. Under optimal conditions, the absorption ratio (A546/A400) of the UV–vis spectra increased linearly with the concentration of clindamycin ranging from 6.25 × 10–7 to 7.50 × 10–6 mol/L (R2 = 0.9945), with a limit of detection (LOD) of 2.00 × 10–7 mol/L and good recovery of 100.0–102.0% (relative standard deviation (RSD) < 2%). The detection process was convenient without complicated instruments. Compared with other analytes, the Au@Ag NPs detection system has good selectivity for clindamycin. In addition, the Au@Ag NPs colorimetric sensor was successfully used to determine clindamycin in human urine samples. This study provides a simple, rapid, intuitive, and low-cost visualization analysis method of clindamycin, which was helpful for the visualization detection of other targets.
研究领域:
分析化学
·
纳米技术
·
药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Peng Zhang,Yueyang Xu,Konglu Guo,Yan Yin,Jilong Wang,Yongping Zeng
Adsorption desulfurization represents an alternative technology for the effective removal of thiophenic compounds from fuels. Metal−organic frameworks have been the ideal candidates for the adsorptive desulfurization of fuel due to the high surface areas. Pristine UiO-66 is thought to be appropriate for the removal of small thiophenic compounds. This work developed a new type of hierarchical-pore (micro and mesopores) UiO-66 with a higher specific surface area and porosity for the removal of larger adsorbates using MOF-5 as the template. To enhance adsorption desulfurization performance, the Ag + -exchanged hierarchical-pore UiO-66 (HP-UiO-66-SO 3 Ag) with π-complexation was synthesized by the ion-exchange method. The HP-UiO-66-SO 3 Ag samples were characterized by FTIR, XRD, SEM, TEM, and N 2 adsorption–desorption isotherms. Compared with the original UiO-66, the HP-UiO-66-SO 3 Ag has a higher specific surface area, pore volume, and pore size. The static adsorption experiments showed that HP-UiO-66-SO 3 Ag had a high adsorption capacity for thiophene and benzothiophene . Moreover, the HP-UiO-66-SO 3 Ag sample still exhibits high adsorptive performance in the presence of toluene. The regeneration results show that about 90% of the initial adsorption capacity of HP-UiO-66-SO 3 Ag can be regenerated after four cycles.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 17
·5859-5867
·
IF 6.119
Yiqing Wei,Huichao He,Chang Liu,Liuqing Yang,Xiaoyong Wang,Aidong Li,Yujie Xiong,Qing Shen,Yong Zhou,Zhigang Zou
The photoelectrochemical (PEC) water oxidation performance of α-Fe2O3 photoanodes is jointly restricted by their high charge recombination and sluggish water oxidation kinetics. Herein, through coupling Ag and CdS nanoparticles with an α-Fe2O3 nanorod film, a new kind of α-Fe2O3/Ag/CdS ternary heterojunction film was constructed and investigated as a photoanode for solar water oxidation. The resultant α-Fe2O3/Ag/CdS photoanode can take full advantages of the α-Fe2O3/CdS heterojunction and the properties of Ag nanoparticles. Specifically, the formation of the α-Fe2O3/CdS heterojunction improves the charge separation and transfer efficiency of the α-Fe2O3 photoanode through band potential differences. Meanwhile, the presence of Ag nanoparticles enlarges the absorption edge of α-Fe2O3/CdS and decreases the electron–hole recombination through their surface plasmon resonance (SPR) effect. In addition, the electrocatalytic properties of Ag nanoparticles could initiate the water oxidation on the α-Fe2O3/Ag/CdS photoanode jointly. As a result, a higher photocurrent density of 3.25 mA cm−2 at 1.23 V vs. RHE was achieved on the α-Fe2O3/Ag/CdS photoanode during water oxidation, which is 2.5 times higher relative to the photocurrent of the α-Fe2O3 photoanode. Furthermore, the onset potential of water oxidation on the α-Fe2O3/Ag/CdS photoanode was negatively shifted about 220 mV relative to the α-Fe2O3 photoanode due to its faster kinetics. With the protection of the amorphous TiO2 layer, the water oxidation activity of the α-Fe2O3/Ag/CdS photoanode can be steadily maintained even after 10 h of reaction at 1.23 V vs. RHE. The present work provides an efficient strategy for the development of α-Fe2O3-based ternary heterojunction photoanodes for solar water oxidation.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 15
·155603
·
IF 3.874
Jun Dong,Yi Cao,Qingyan Han,Wei Gao,Tuo Li,Jianxia Qi
In this paper, Au nanoparticles (AuNPs) are prepared using wet chemical reduction transfer of dense AuNPs film by self-assembly to the surface of Ag grating, which is inverted from the inner DVD after evaporation. The Ag grating/AuNPs self-assembly hybrid substrate commonly used in surface-enhanced Raman scattering (SERS) research is produced. The coupling effect between AuNP-AuNP and AuNPs-Ag slugs can evidently enhance the local electric field. Experimental results show that the hybrid SERS substrate can detect 10−9 M Rh6G, and the enhancement factor reaches 4.4 × 105. This small, cheap hybrid substrate has enormous potential in the field of SERS sensing.
研究领域:
材料科学
·
纳米技术
·
光学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2022
·Vol. 77
·期 4
·2115-2124
·
IF 2.146
Lin Yamei,Zhi Hongxin,Liu Shengkai,Chen Boyu,Fu Yujie,Liu Zhiguo
Proanthocyanidins-functionalized Fe 3 O 4 @ Ag nanoparticles (Fe 3 O 4 @ AgNPs) were synthesized by one-step hydrothermal method wherein silver nanocrystals were grown in situ on the surface of Fe 3 O 4 nanoparticles with the assistance of proanthocyanidins. The morphology and structure of Fe 3 O 4 @ AgNPs were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier-transform infrared spectrometer (FTIR), UV–Vis spectrophotometer (UV–Vis), X-ray powder diffractometer (XRD), and physical property measurement system (PPMS). The characterization results indicated that sliver nanocrystals were deposited on the surface of Fe 3 O 4 nanoparticles to form spherical and uniformly dispersed Fe 3 O 4 @ AgNPs. Moreover, the Fe 3 O 4 @ AgNPs had a high magnetic response, which can be recovered from the environment. The antibacterial activity of the Fe 3 O 4 @ AgNPs against Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ), and Candida albicans ( C. albicans ) was investigated. The results confirmed that the Fe 3 O 4 @ AgNPs had broad-spectrum antibacterial activity. At the same time, the adsorption property of the nanoparticles for heavy metal ions Cu 2+ , Pb 2+ , and Cd 2+ was also studied. The results showed that pH and incubation time played an essential role in the removal of heavy metal ions, and the nanoparticles had excellent removal efficiency. The multifunctional nanomaterial Fe 3 O 4 @ AgNPs prepared by this study have the potential to apply in the biomedical and water disinfection fields.
研究领域:
材料科学
·
生物医学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 17
·2967
·
IF 5.719
Xiaohan Wang,Fan Zhang,Feiyue Hu,Yaya Li,Yongqiang Chen,Hailong Wang,Zhiyu Min,Rui Zhang
To solve the pollution problem of electromagnetic waves, new electromagnetic shielding materials should meet the requirements of being lightweight with high electrical conductivity. In this work, the combination of silver (Ag) nanoparticles and nitrogen doping (N-doping) was expected to tune the electromagnetic and physical properties of Ti3C2TxMXene, and the Ag@N-Ti3C2Txcomposites were fabricated through the hydrothermal reactions. The nitrogen doped (N-doped) Ag@Ti3C2Txcomposites showed a hollow structure with a pore size of 5 μm. The influence of N-doped degrees on the electromagnetic interference (EMI) shielding performance was investigated over 8–18 GHz. Therefore, the controlled N-doping composites exhibited reflection-based EMI shielding performance due to the electrical conductivity and the special three-dimensional (3D) honeycomb-like structure. The achieved average EMI shielding values were 52.38 dB at the X-band and 72.72 dB at the Ku-band. Overall, the Ag@N-Ti3C2Txfoam, due to its special 3D honeycomb-like structure, not only meets the characteristics of light weight, but also exhibits ultra-high-efficiency EMI shielding performance, revealing great prospects in the application of electromagnetic wave shielding field.Keywords:nitrogen doping;Ag@N-Ti3C2Txcomposites;honeycomb-like structure;electromagnetic interference;multi-reflections
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Na Li,Zhenyuan Ji,Lizhi Chen,Xiaoping Shen,Yifei Zhang,Shiqing Cheng,Hu Zhou
In this study, highly dispersed Ag nanoparticles anchored on Fe 3 O 4 modified polydopamine sub-micrometer spheres (PSS) nanocomposites were fabricated by a facile two-step approach. The catalytic properties of the as-obtained PSS/Fe 3 O 4 /Ag ternary nanocomposites were evaluated with the reduction of 4-nitrophenol by NaBH 4 as a model reaction. It is shown that the presence of Fe 3 O 4 can significantly decrease the particle size of the in-situ formed Ag nanoparticles on PSS, and optimize the catalytic performance of PSS/Ag nanocomposites. Additionally, the as-synthesized PSS/Fe 3 O 4 /Ag ternary nanocomposites exhibit high catalytic stability for recycle. Magnetic study reveals that the ternary nanocomposites display room-temperature superparamagnetic behavior. It is believed that this simple and effective method can be extended for the preparation of other polydopamine-based multicomponent nanocomposites with intriguing property, which would hold great promise for a variety of applications.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 14
·4877-4887
·
IF 7.393
Li Xiao,Kaiqi Liu,Lian Duan,Xinjian Cheng
The detection and removal of heavy metals in the environment is urgent and meaningful. In this work, two types of fluorescent functionalized silks OSP and ASP have been prepared using worm silk as the substrate. These fluorescent silk probes exhibit an obvious fluorescence quenching effect in the presence of Hg2+ or Ag+, enabling silk to specifically detect Hg2+ or Ag+. An obvious color response occurs under visible light, from yellow to brown or gray, thereby realizing dual-channel identification of fluorescence and colorimetry. In addition, its sensing mechanism has been studied, and it is found that the probe reacts with metal ions as a reactive response. Compared with the fluorescent probes bearing one CC/CC bond, the probes with two terminal CC/CC bonds are more sensitive. And the excellent recognition ability can make the limit of detection as low as 0.25 μM. This indicates that silk fluorescent probes can be used to detect Hg2+ and/or Ag+.
研究领域:
生物化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Minghua He,Zulhumar Turup,Xuekun Jin,Fengjuan Chen
MnO 2 is considered to be one of the most promising electrocatalysts for oxygen reduction reactions (ORR) in alkaline media and can be applied to various electrochemical energy conversion and storage devices. However, it is limited by the relatively slow kinetics of the cathodic electrochemical reactions . In addition, it is difficult to control the presence state of Ag during the modification of MnO 2 . To this end, an efficient ORR electrocatalyst of Ag nanoparticles supported by MnO 2 nanorods was successfully synthesized by using NH 3 ·H 2 O as a complexing agent to inhibit the Ag + intercalating into the tunnels of MnO 2 . The half-wave potential ( E 1/2 ) and limiting current density ( J lim ) of the obtained Ag/MnO 2 electrocatalysts are 0.81 V and −5.6 mA cm −2 , respectively, showing comparable ORR catalytic activity to commercial Pt/C catalysts. The excellent catalytic performances can be attributed to the presence of abundant oxygen vacancies and Mn 3+ species on the MnO 2 surface, as well as the synergistic effect between MnO 2 substrates and Ag nanoparticles. Among them, oxygen vacancies enhances the adsorption of O 2 , Mn 3+ facilitates the displacement of O 2 2− /OH − , MnO 2 inhibits the accumulation of peroxide species to improving the oxygen environment on the Ag surface and Ag accelerates the electron transfer in the whole process. This work provides a useful guide for the design of efficient Mn-based ORR electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 38
·2302302
·
IF 13.3
Zhao He,Jian Zhu,Xin Li,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
In this paper, Au@Ag nanopencil is designed as a multimodality plasmonic nanoprobe based on asymmetric etching for the detection of SCN − and ClO − . Au@Ag nanopencil with Au tip and Au@Ag rod is prepared by asymmetric tailoring of uniformly grown silver-covered gold nanopyramids under the combined effect of partial galvanic replacement and redox reaction. By asymmetric etching in different systems, Au@Ag nanopencil exhibits diversified changes in the plasmonic absorption band: O 2 •− facilitated by SCN − etches Au@Ag rod from the end to the tip, causing a blue shift of the localized surface plasmon resonance (LSPR) peak as the aspect ratio decreases; while the ClO − can retain Au@Ag shell and etch Ag within rod from the tip to the end, causing a redshift of the LSPR peak as the coupling resonance weakens. Based on peak shifts in different directions, a multimodality detection of SCN − and ClO − has been established. The results demonstrate the detection limits of SCN − and ClO − are 160 and 6.7 n m , and the linear ranges are 1–600 µ m and 0.05–13 µ m , respectively. The finely designed Au@Ag nanopencil not only broadens the horizon of designing heterogeneous structures, but also enriches the strategy of constructing multimodality sensing platform.
研究领域:
纳米材料
·
分析化学
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）