JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2023
·
IF 2.2
Runmian Ming,Cailing Zhang,Liangbo Xie,Jing Chang,Yi Li
Although gold (Au) plays an important role in many fields, the residual Au3+ ion in our natural environment is one of the most noxious heavy metal ions for animals and plants. It is of great significance to develop an efficient and simple detection method for Au3+. Based on heterogeneous catalytic activation of peroxymonosulfate (PMS) by Ag@Cu2O nanoparticles (Ag@Cu2O NPs), a novel, visible and convenient strategy for Au3+ detection was developed. The well-dispersive Ag@Cu2O NPs could catalyze PMS to produce sulfate radicals (SO4•−) and hydroxyl radicals (·OH) which could oxide 3, 3′, 5, 5′-tetramethylbenzidine (TMB) into oxidized TMB (oxTMB) in colorimetric detection. The introduced Au3+ could effectively enhance catalytic activation of PMS to produce more SO4•− and ·OH. This was because there was the synergistic effect of Au and CuO, which reduced the charge transfer resistance and promoted electron transfer. This method had good specificity against 22 types of cationic or anionic interfering ions and the detection limit of Au3+ was about 290 nmol·L−1. In this study, a new substrate of PMS was used for colorimetric detection of heavy metal ions, and the catalytic synergy of Au and CuO in PMS/Ag@Cu2O NPs/Au3+ colorimetric detection system was analyzed in detail.
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ANALYST
·
2015
·Vol. 141
·期 3
·1098-1104
·
IF 4.107
Xiang Han,Lei Zhao,Dong-En Wang,Juan Xu,Longlong Zhang,Mao-Sen Yuan,Qin Tu,Jinyi Wang
In this paper, we designed and synthesized a novel TBET-based ratiometric fluorescent chemodosimeter, RH-Au, for Au3+. It was found that the probe RH-Au displayed highly selective, sensitive and naked-eye detection upon the addition of Au3+. The probe RH-Au can be used in the pH range 6.0–7.5 and the detection limit was determined to be as low as 2.91 nM (0.57 ppb). We also demonstrated a successful application of imaging Au3+ in living cells using RH-Au.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xushuo Yuan,Wentao Yao,Decai Ji,Li Liu,Yanfei Lin,Heyang Zeng,Tao Jin,Kaimeng Xu,Guanben Du,Lianpeng Zhang
To achieve real-time monitoring of Au 3+ , a corn bract cellulose-based fluorescent probe MAC-1 for was synthesized. MAC-1 showed good fluorescence properties in DMF-H 2 O (1:9, v /v, pH = 7.4) solution, showed a fluorescence emission peak at 520 nm with quenching fluorescence properties for Au 3+ . The structure of MAC-1 was analyzed by SEM (Sample microstructure images), XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), 1 H NMR, Elemental analysis, EDS, Mapping and TG (Thermogravimetry) were analyzed. The fluorescence properties of the probe were also characterized by UV spectrophotometer and fluorescence spectrophotometer. The results showed that the recognition of Au 3+ by the probe MAC-1 exhibited high selectivity and high sensitivity. Moreover, it is highly resistant to interference and has a short response time, which can be rapidly responded within 1 min. In addition, to improve the practical application of the probe, the probe was prepared as a fluorescent composite film and the fluorescence effect shown by the fluorescent composite film is consistent with the fluorescence change of the probe MAC-1 itself. The fluorescent composite film also has excellent selectivity and good overall physical and mechanical properties. This study provides a meaningful reference for the detection of Au 3+ and further expands the application field of agroforestry waste.
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RSC Advances
·
2024
·Vol. 14
·期 27
·19284-19293
·
IF 3.9
Tao Li,Zhuo Li,Fengjiao Chen,Liying Zhu,Hua Tang,Dan Wang,Zhenrong Tang
Bovine serum albumin-stabilized Au nanoclusters (BSA-Au NCs) have emerged as promising contenders for imaging agents and highly sensitive fluorescence sensors due to their biocompatibility and strong photoluminescence. Optimizing the synthesis conditions of BSA-Au NCs is crucial for enhancing fluorescence imaging and other nanocluster applications. In this study, for the first time, we systematically investigated the effects of BSA concentration and Au3+ on both particle size and optical characteristics of BSA-Au NCs. When the two components achieved a suitable concentration ratio, it was beneficial to form BSA-Au NCs with a high quantum yield (QY = 74.30%) and good fluorescence stability. In contrast, an inappropriate concentration ratio would lead to the formation of gold nanoparticles (Au NPs), and their internal filtration effect (IFE) would attenuate the fluorescence emission of BSA-Au NCs. The BSA-Au NCs were then employed as efficient fluorescence sensors for detecting Hg2+. Furthermore, the growth mechanism of BSA-Au NCs was elucidated by monitoring fluorescence changes during different incubation times. The BSA-Au NCs with a high quantum yield introduce a novel synthetic concept for sensitive fluorescent probes and expanding versatile applications of BSA-Au NCs in catalysis, chemical sensing and biomedicine.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jiang He,Wenli Zhang,Jiabao Lv,Yaohong Yang,Xushuo Yuan,Jinzhong Yao,Li Liu,Kaimeng Xu,Guanben Du,Lianpeng Zhang
In this study, a novel fluorescent probe, MAC-2, for the detection of Au 3+ was designed and synthesised using cellulose as a carrier combined with benzothiazole derivatives. The structure of the probe was confirmed by SEM, XRD, FTIR, and 1 H NMR, also the optical properties of the product were investigated. MAC-2 showed bright green fluorescence under a 365 nm UV lamp and exhibited significant quenching behaviour toward Au 3+ . MAC-2 utilises more sustainable biomass resources, featuring green and biodegradable characteristics that meet environmental requirements. Compared with most reported probes, it exhibits notable fluorescence properties. The limit of detection (LOD) is as low as 0.057 μM, and the response time is 1 min. It also demonstrates good specific recognition and anti-interference abilities. In addition, a smartphone was used as a portable signal processing device to achieve rapid detection of Au 3+ concentration. Meanwhile, MAC-2 was successfully prepared as a fluorescent test strip, providing a potential application for the convenient detection of Au 3+ . The high sensitivity and selectivity exhibited by cellulose-based fluorescent probes in detecting Au 3+ offer valuable insights and new ideas for the detection of other metal ions and biomolecules. These inspirations will help promote the continuous development of research and applications in related fields.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Xulin Wang,Xiuzhen Zheng,Huijuan Han,You Fan,Sujuan Zhang,Sugang Meng,Shifu Chen
Glucose, as one of the most familiar biomass, can be utilized to produce hydrogen and fine chemicals. This work reports the renewable hydrogen production from glucose over Au/CdS-nanorods (Au/CdS-NRs) photocatalyst . For Au/CdS-NRs catalyst, it shows a superior H 2 evolution rate of 90.0 μmol g −1 h −1 under visible light irradiation. Moreover, the H 2 generation from the glucose solution on Au/CdS-NRs prepared by twice solvothermal method is much higher than Au colloid and photoreduction methods. Prepared with twice solvothermal method, Au nanoparticles are obtained from Au 3+ ions on the CdS surface, as Au 3+ can be reduced by photogenerated electrons. The separated hole can oxidize glucose to produce protons, and protons can be reduced by photogenerated electrons into H 2 . Meanwhile, the Au/CdS-NRs can also be used to produce H 2 from other biomasses, for instance sucrose, soluble starch, celluflor, pectin and waste paper scraps. The probable mechanism is proposed and discussed in the photocatalytic process from glucose reforming. This work indicates that the process of self-reducing Au 3+ to Au can drastically increase the photocatalytic efficiency of H 2 evolution from biomass, by promoting the separation and transportation of photogenerated charge carriers.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 26
·14710-14721
·
IF 12.732
He Huang,Wanyue Ye,Caicheng Song,Yingcen Liu,Xiaotong Zhang,Yu Shan,Yuzhen Ge,Shufen Zhang,Rongwen Lu
The selective oxidation of primary carbon–hydrogen bonds in the methyl group of toluene to corresponding oxygenates is of immense significance. This transformation, however, remains challenging and often requires either extensive optimization of the present chemical operating processes or, more importantly, the design and development of novel catalysts. In this paper, we achieve the confinement of uniform Au nanoparticles by using Silicalite-1 (Au@Silicalite-1) via an improved impregnation method for solvent-free oxidation of toluene by oxygen to benzaldehyde. In situ Ar+ etching XPS experiments revealed that in the evolution of Au0 and Au3+ species in a single Au@Silicalite-1 crystal the proportion of the Au3+ species becomes enriched from 0 on the surface to >80% in the center. In the synergetic catalysis between Au0 and Au3+ species, it was observed that the electron-rich Au0 species activated oxygen to form superoxide anion radicals, while the electron-deficient Au3+ species promoted activation of the primary carbon–hydrogen bond in toluene and enabled efficient desorption of the desired product benzaldehyde with selectivity >90%. For comparison, Silicalite-1 or SiO2 supported Au0-rich catalysts exhibited strong adsorption of benzaldehyde, generating overoxidized benzoic acid as the main product.
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ACS Omega
·
2019
·
IF 2.584
Jun-Li Yang,Yun-Han Yang,Yu-Peng Xun,Ke-Ke Wei,Jie Gu,Mei Chen,Li-Juan Yang
A novel fluorescent probe, amino-pillar[5]arene (APA), was prepared via a green, effective, and convenient synthetic method, which was characterized by nuclear magnetic resonance (NMR), infrared (IR), and high-resolution mass spectrometry. The fluorescence sensing behavior of the APA probe toward 22 metal ions in aqueous solutions were studied by fluorescence spectroscopy. The results showed that APA could be used as a selective fluorescent probe for the specificity detection of Au3+ ions. Moreover, the detection characteristics were investigated by fluorescence spectral titration, pH effect, fluorescence competitive experiments, Job’s plot analysis, 1H NMR, and IR. The results indicated that detection of Au3+ ions by the APA probe could be achieved in the range of pH 1–13.5 and that other coexisting metal ions did not cause any marked interference. The titration analysis results indicated that the fluorescence intensity decreased as the concentration of Au3+ ions increased, with an excellent correlation (R2 = 0.9942). The detection limit was as low as 7.59 × 10–8 mol·L–1, and the binding ratio of the APA probe with Au3+ ions was 2:1. Therefore, the APA probe has potential applications for detecting Au3+ ions in the environment and in living organisms.
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Nanoscale
·
2017
·Vol. 10
·期 6
·2781-2789
·
IF 7.367
Chao Hu,Wenhui Chen,Yi Xie,Santosh Kumar Verma,Priscila Destro,Gang Zhan,Xingzhu Chen,Xiujian Zhao,P. James Schuck,Ilka Kriegel,Liberato Manna
We demonstrate the fabrication of various types of heterostructures, including core–shells and dimers. This is achieved by reacting platelet-shaped covellite (CuS) nanocrystals (NCs) with Au3+ ions under various reaction conditions: the exposure of CuS NCs to Au3+ ions, in the presence or in the absence of ascorbic acid (AA), leads to the formation of CuS@Au core–shell nanostructures; the reaction of CuS NCs with Au3+ ions in the presence of oleylamine (OM) leads to the formation of CuS@Au2S; the presence of both OM and AA leads to the formation of Au/CuS dimers. Depending on which condition is chosen, either cation exchange (CE) between gold and copper ions is predominant (leading to amorphous Au2S) or the reduction of Au3+ leads to the nucleation of metallic Au domains (which are operated by the AA). In the heterostructures achieved by CE, the Au2S shell is almost entirely amorphous, and can be converted to polycrystalline upon electron beam irradiation. Finally, when both oleylamine and AA are present in the reaction environment, Au/CuS dimers are formed due to the reduction of Au3+ to metallic Au domains which nucleate on top of the CuS seeds. The experimental dual plasmonic bands of the CuS@Au core–shells and Au/CuS dimers are in agreement with the theoretical optical simulations. The procedures described here enable the synthesis of core–shell nanostructures with tunable localized surface plasmon resonances (LSPRs) in the near-infrared (NIR) region, and of plasmonic metal/semiconductor heterostructures with LSPRs in both the NIR and the visible regions.
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Small
·
2022
·Vol. 18
·期 23
·2200548
·
IF 15.153
Meng-Meng Pan,Yu Ouyang,Yong-Li Song,Lu-Qin Si,Ming Jiang,Xu Yu,Li Xu,Itamar Willner
The synthesis and characterization of Au 3+ -modified UiO-67 metal-organic framework nanoparticles, Au 3+ -NMOFs, are described. The Au 3+ -NMOFs reveal dual oxidase-like and peroxidase-like activities and act as an active catalyst for the catalyzed generation of O 2 •− under aerobic conditions or •OH in the presence of H 2 O 2 . The two reactive oxygen species (ROS) agents O 2 •− and •OH are cooperatively formed by Au 3+ -NMOFs under aerobic conditions, and in the presence of H 2 O 2. The Au 3+ -NMOFs are applied as an effective catalyst for the generation ROS agents for antibacterial and wound healing applications. Effective antibacterial cell death and inhibition of cell proliferation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E . coli ) bacterial colonies are demonstrated in the presence of the Au 3+ -NMOFs. In addition, in vivo experiments demonstrate effective wound healing of mice wounds infected by S. aureus , treated by the Au 3+ -NMOFs.
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Xiaojing Yang,Yingying Wang,Jingjing Xu,Mei-Xia Zhao
In recent years, carbon dots (CDs) have shown potential applications in fluorescence tracing and imaging due to their excellent optical and chemical properties. In this work, a new type of carbon dots (Cy7-CDs) with near-infrared absorption and emission was synthesized from cyanine dyes and polyethylene glycol by hydrothermal reaction. The prepared Cy7-CDs exhibited low toxicity and excellent biocompatibility, which were applied to detect the noble metal ions Au 3+ /Hg 2+ and glutathione via the ‘on–off-on’ mode. In addition, in vivo fluorescence images demonstrated that Cy7-CDs could efficiently accumulate in the tumor. Therefore, Cy7-CDs could act as a multi-functional probe for biological sensing and tumor diagnosis.
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Guo Wei,Chuanliang Wang,Rui Wang,Xuhui Geng,Jinhua Li,Lingxin Chen,Zhihua Song
In this study, a novel carbon dots-based system was developed for the sequential quantification of Au 3+ and L-cysteine (L-Cys). The system comprises N,F-doped carbon dots (N,F-CDs), a custom-designed miniaturized fluorimeter, and test strips. The N,F-CDs exhibit outstanding optical properties, including a large Stokes shift (127 nm) and high fluorescence intensity. The test strips offer low-cost, low-volume sample consumption, while the miniaturized fluorimeter provides high sensitivity in a compact format. The system demonstrated excellent analytical performance, including high sensitivity (limits of detection: 0.048–0.488 μmol/L for Au 3+ and 8.7–40.9 nmol/L for L-Cys), minimal matrix interference (within ±20 %), high accuracy (97.5 % to 104.5 % for Au 3+ , 97.6 % to 107.5 % for L-Cys), good precision (2.9 % to 4.5 % for Au 3+ , 1.2 % to 7.0 % for L-Cys), robust stability, and strong inter/intra-day reproducibility (relative standard deviations ≤2.1 %). Furthermore, it showed high selectivity for Au 3+ and L-Cys in complex matrices such as tap water, milk, and lemon-flavored beverages.
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