FOOD CHEMISTRY
·
2023
·
IF 8.8
Zhiyang Chen,Yue Sun,Jiyong Shi,Wen Zhang,Xinai Zhang,Xiaowei Hang,Zhihua Li,Xiaobo Zou
The goal of food safety supervision is to directly identify the pesticide residues on the surface of fruits and vegetables. This study proposed to develop a facile, non-destructive, and sensitive method based on surface-enhanced Raman scattering (SERS) to detect non-systemic pesticides on the surface of fruits and vegetables. The composite material was prepared by loading CTAB guided Au@Ag NRs with positive charge onto filter paper which was modified with PDADMAC(+) and PSS(−) using electrostatic adsorption. Au@Ag NRs with bimetallic synergies were effectively adsorbed in the fiber grid to generate 3D SERS hotspots within a few microns of depth. The results showed that the 3D composite flexible substrate had a high SERS activity, great repeatability, and sensitivity when the method was utilized to detect 4-MBA, methyl-parathion, thiram and chlorpyrifos. Three kinds of non-systemic pesticides on the peel could be detected directly and quickly owing to the arbitrary bending of the substrate, demonstrating the efficiency of the SERS “paste-reading” method. The acquired findings demonstrated that PDADMAC/PSS/Au@Ag NRs composite filter paper had the potential to provide rapid feedback for in- situ analysis of pesticide residues on the surface of fruit and vegetable.
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高影响因子
JOM
·
2021
·Vol. 74
·期 2
·622-633
·
IF 2.474
Liu Zhihong,Ye Fengchun,Chen Rui,Wang Hongjun,Xia Longgong
Halogen-containing organic components in waste electrical and electronic equipment have an obvious influence on the distribution behaviors of valuable metals during the smelting processes. However, the mechanism is still incomplete in the literature. The equilibration-quenching-(ICP+EPMA) experimental technique has been applied in studying the partitioning behaviors of Au, Ag, and Sn in the Cu-FeO x -SiO 2 -CaO-Al 2 O 3 smelting system in the presence of halogen elements (F, Cl, Br). The obtained results showed that: (1) 93% Au terminated into the alloy phase in CaF 2 adding experiments, and a maximum of 32% Au reported to the gas phase in CaCl 2 or CaBr 2 adding experiments; (2) 22–49% Ag entered the gas phase when adding CaF 2 into the system, and 3–34% Ag entered into the gas phase when adding CaCl 2 or CaBr 2 ; and (3) halogen elements influenced Sn dramatically, and portions of Sn in the gas phase and slag phase increased along with increasing temperature or halides dosage.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xiao-Shuai Zhang,Kai Cheng,Jian-Shuang Wei,Zhuo-Yao Huang,Xiao-Lin Hou,Yong-Guo Hu,Xiao-Quan Yang,Fang Zhang,Xing Sun,Wei Chen,Bo Liu,Yuan-Di Zhao
In this paper, a mixture of lecithin, polyethylene glycol monostearate, and polyethylene glycol phospholipid (DSPE-PEG 2000 ) is used to wrap hydrophobic nano silver sulfide (Ag 2 S) and 3 ∼ 5 nm ultra-small gold nanoparticle (mAu) to form ∼ 150 nm hydrophilic nanocomposite probe Ag 2 S/ [email protected] 2000 (ASAuDP) with good stability and dispersion. The probe combines the functions of Ag 2 S and mAu, while mAu can significantly inhibit the fluorescence (FL) of Ag 2 S, thereby reducing the phototoxicity of probe when circulating in the body. When the ASAuDP probe is phagocytosed by tumor cell, Ag 2 S and mAu are separated due to the rupture of probe, thereby restoring the ability of FL imaging and ROS production. MTT test, blood analysis and organ pathology test prove that ASAuDP is a safe probe. In vitro and in vivo imaging experiments prove that the ASAuDP probe presents good FL, CT and photoacoustic imaging capabilities. In vitro and in vivo treatments prove that the ASAuDP probe has both photothermal and sonodynamic therapy abilities, and the synergy between them has the best therapeutic effect. Therefore, ASAuDP probe is a kind of integrated diagnostic and therapeutic probe with good safety, and it has a good application prospect in the treatment of tumor.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 5
·2006-2017
·
IF 3.442
Zhao Yiming,Guo Yingchun,Wang Xiaomei,Zhang Xu
To construct secondary processes of multiscale architecturing, wrinkly silica microspheres (WSMs) are nested into the empty chamber of templated macroporous structure by using core–shell microspheres to self-assemble the colloidal crystal template and selectively removing the shells. It is a universal approach to form the binary inverse opal (IO) structures and maintain interconnected nanochannels. With gold nanoparticles loaded on the WSMs (denoted Au-WSMs@IO SiO 2 ) in the meantime, it has been demonstrated by the reduction of 4-nitrophenol (4-NP) that the binary IO materials (Au-WSMs@IO SiO 2 ) exhibited higher catalytic efficiency than simple nested microspheres (Au-WSMs) after recycling 15 times. Furthermore, it was nice to see it had excellent catalytic effect in the epoxidation of styrene. Owing to the outstanding catalytic activity, recyclability and mechanical stability of the binary IO materials, it will be a promising way to widely apply in heterogeneous catalysis.
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Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 32
·17442-17450
·
IF 12.732
Yintong Zhang,Feng Du,Ruyi Wang,Xintong Ling,Xiaoyong Wang,Qing Shen,Yujie Xiong,Tao Li,Yong Zhou,Zhigang Zou
The electrocatalytic nitrogen oxidation reaction (NOR) is a promising alternative to the industrial synthesis of nitrate. However, with the enhancement of NOR activity by modification methods, the competitive oxygen evolution reaction (OER) is always improved simultaneously. Here, a hybrid electrocatalyst composed of Au nanoparticles and oxygen vacancy-enriched niobium oxide nanobelts (Au–Nb2O5−x) was prepared on niobium foil for N2 fixation into NO3−. The results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) demonstrate that electron transfer occurs between Au nanoparticles and the oxygen vacancies in Nb2O5−x nanobelts, which adjusts the electronic structures of oxygen vacancies near the Au/Nb2O5−x interface. Electrochemical and N2 temperature-programmed desorption (TPD) tests indicate that the optimization of the electronic structure suppresses the activity of the competitive OER on oxygen vacancy sites and facilitates nitrogen adsorption on the surface of Au–Nb2O5−x, which significantly enhances the NOR performance of the electrocatalyst.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Lian Ma,Jiao Zhu,Chao Wu,Duo Li,Xuehui Tang,Yue Zhang,Changhua An
Well-dispersed Prussian blue (PB) and Au nanoparticles (Au NPs) loaded three dimensional MoS 2 nanoflowers (PB-Au@MoS 2 NFs) was synthesized by a simple and economical method. The structure, morphology and composition of the hybrid were characterized by XRD, SEM and EDS. Similar to the reported literature, MoS 2 nanoflowers showed peroxidase-like activity in catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB). This peroxidase-mimicking activity could be enhanced with the introduction of PB and Au NPs. Herein, PB-Au@MoS 2 NFs could be used to establish a new platform for the determination of H 2 O 2 and glucose by the chromogenic reaction. Wide linear ranges with 0–15 μM and 0–120 μM for H 2 O 2 and glucose detection were finally obtained. The detection limits were as low as 0.25 μM and 3 μM (with signal to noise ratio of 3), respectively. The established platform was also used successfully for the determination of glucose in human serum and fruit juice samples with excellent sensitivity and stability.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 37
·19300-19308
·
IF 11.301
Jingchun Wang,Xiaoyu Qiu,Keying Su,Siyuan Wang,Jiatian Li,Yawen Tang
It remains a grand challenge to control the island growth mode because a conformal growth is theoretically more favorable, in which the lattice mismatch between the overlayer and the substrate is negligible. Herein, we report the first example of “Frank–van der Merwe” mode and “Volmer–Weber” mode of Pd atoms on Boerdijk–Coxeter-type helical Au(111) nanowires. Quantitative analyses suggest that the pH-induced faster kinetic reduction rate (1.2 × 10−2 s−1) is a crucial factor to switch the Pd-growth mode from the conformal 4-atom-layers to ultrasmall islands. As a proof-of-concept application, the VW Au@Pd HNWs exhibit outstanding ORR activity (Eonset = 1.07 V, E1/2 = 0.91 V) and stability, outperforming FM Au@Pd NWs, Au(111) NWs, Pd black, and most reported electrocatalysts. Physical characterization systematically elucidated similar components, d-band center locations, and lattice distortions of both the representative structures, giving brand-new insights into the impact of their slightly different surface microstructures. In particular, the segmented oxyphilic–anaerobic interface of the VW Au@Pd HNWs directly balances the adsorbability of the intermediates; meanwhile, the interleaved lattice orientations favor multi-directional electron transmissions to promote ORR kinetics. This finding not only challenges the conventional wisdom of lattice-matched growth but also provides an identical model for the in-depth understanding of the structure–function relationship with a focus on the growth modes.
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ACS Sensors
·
2020
·
IF 7.333
Jiaming Chen,Longhua Guo,Lifen Chen,Bin Qiu,Guolin Hong,Zhenyu Lin
Mostly, surface-enhanced Raman scattering (SERS) sensors used the Raman characteristic bands concentrated in the Raman “fingerprint” region (500–1800 cm–1), which may result in spectral overlapping interference. The study of the response in the Raman-silent region (10–500 and 1800–2800 cm–1) can help overcome this problem. Hydrogen sulfide (H2S) gas causes a great threat to human’s health, but its low concentration in the airborne species is a challenge for sensitive and selective detection. Herein, a novel low-wavenumber (10–500 cm–1) SERS sensor for H2S gas detection has been developed based on gold nano-bipyramids (Au NBPs) encapsulated by zeolitic imidazolate framework-8 (ZIF-8) (Au NBPs@ZIF-8). The sensor takes advantage of the high adsorption capacity of ZIF-8 toward H2S gas and the H2S-triggered SERS spectral changes in the low-wavenumber Raman-silent region. A clear SERS peak of Au–Br at ∼175 cm–1 generated from Au NBPs@ZIF-8 showed a decrease in the presence of H2S because of the competition of adsorption sites between Au–S and Au–Br bonds. Furthermore, Au NBPs@ZIF-8 can enrich and monitor the level of H2S gas with high efficiency and low interference. The developed sensor has a detection range of 0.2 nM to 20 mM with a limit of detection (LOD) of 0.17 nM. The developed sensor had been applied to detect the H2S gas released from the spoiled fish meat with high selectivity.
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RSC Advances
·
2019
·Vol. 9
·期 18
·10314-10319
·
IF 3.049
Yazhou Qin,Yuxiang Lu,Wufan Pan,Dongdong Yu,Jianguang Zhou
The controlled synthesis of metallic nanomaterials has attracted the interest of many researchers due to their shape-dependent physical and chemical properties. However, most of the synthesized nanocrystals cannot be combined with spectroscopy to measure the reaction kinetics, thus limiting their use in monitoring the catalytic reaction process to elucidate its mechanism. As a powerful analytical tool, surface-enhanced Raman spectroscopy (SERS) can be used to achieve in situ monitoring of catalytic reactions by developing bifunctional metal nanocrystals with both SERS and catalytic activities. Herein, we have developed a simple one-pot synthesis method for the large-scale and size-controllable preparation of highly rough hydrangea Au hollow nanoparticles. The growth mechanism of flower-like Au hollow nanostructures was also discussed. The hollow nanostructure with a 3D hierarchical flower shell combines the advantages of hollow nanostructure and hierarchical nanostructure, which possess high SERS activity and good catalytic activity simultaneously. Furthermore, the hydrangea Au hollow crystals were used as a bifunctional nanocatalyst for in situ monitoring of the reduction reaction of 4-nitrothiophenol to the 4-aminothiophenol.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Kaili Yao,Bing Dai,Xiaojun Tan,Victor Ralchenko,Lei Yang,Benjian Liu,Zhenhua Su,Jiwen Zhao,Kang Liu,Jiecai Han,Jiaqi Zhu
Amorphous boron powders were applied to grow boron-doped diamond (BDD) films with chemical vapor deposition method. The material is nontoxic and noncorrosive compared to conventional boron sources such as boroethane. The mechanism for using solid boron source as the dopant in low temperature and low pressure has been explained with a non-equilibrium thermodynamic coupling model and optical emission spectroscopic analysis . The BDD film was utilized in a non-enzymatic glucose sensor. A porous Au/Ni layer was then placed on the BDD surface for enhanced sensitivity. The electrode was characterized by scanning electron microscopy, Raman spectra , X-ray diffraction, cyclic voltammograms and amperometric responses. Typically operated at a voltage of 500 mV, it demonstrated fast response to glucose thanks to its large surface, rapid electron transfer, and synergetic effects between Au and Ni. Two specific linear ranges are found, one between 0.02 and 2 mM, and a second one between 2 and 9 mM. The detection limit and the best sensitivity are 2.6 μM and 157.5 μAmM −1 cm −2 .
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MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Yu Hua,Jia-yuan Li,Hong Min,Xiao-hong Wu,Xiao-bing Cui,Yi-jun Chen,Hong-zhen Lian,Dong Sheng
In this work, by introducing solvothermal method for generating Fe 3 O 4 nanoparticles and “one-pot” method for synthesizing organic–inorganic hybrid monolithic vinyl functionalized Fe 3 O 4 (Fe 3 O 4 @HM), a facile procedure was proposed for preparing poly(1-vinylimidazole) (PVIM) functionalized gold ion imprinted polymer based MNPs@IIP (MNPs@HM@PVIM-Au-IIP). The as-prepared magnetic nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating sample magnetometry (VSM), etc. After the optimum conditions, including solution pH, adsorption time and sample volume, eluent composition and volume, and elution time were investigated, this MNPs@IIP was employed as ion imprinted polymer magnetic solid phase extraction (II-MSPE) matrix for separation and enrichment of trace gold ions followed by inductively coupled plasma mass spectrometric (ICP-MS) determination with excellent selectivity and sensitivity, and strong anti-interference ability. These merits were benefited from the formation of hybrid monolithic interlayer enduing the resultant MNPs@HM@PVIM-Au-IIP with good chemical and mechanical stability, as well as the dimensional homogeneity due to the solvothermal-generated Fe 3 O 4 nanoparticles as the cores. The applicability superiority of this MNPs@IIP was confirmed by the rapid and efficient extraction of trace level Au(III) in environment water, sediment, soil, coal and ore samples with satisfactory results. The reliability of this II-MSPE-ICP-MS method was also verified by using corresponding Certified Standard Reference materials and spiking recovery of the real samples analyzed.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Shixin Zhang,Durga P. Acharya,Xiaomin Tang,Huaili Zheng,Guang Yang,Derrick Ng,Zongli Xie
Membrane fouling has remained a major challenge limiting the wide application of membrane technology because it reduces the efficiency and shortens the lifespan of the membrane, thus increasing the operation cost. Herein we report a novel dual-function nanocomposite membrane incorporating silver-coated gold nanoparticles (Au@AgNPs) into a sulfosuccinic acid (SSA) cross-linked poly(vinyl alcohol) (PVA) membrane for a pervaporation desalination. Compared with the control PVA membrane and PVA/SSA membrane, the Au@AgNPs/PVA/SSA membrane demonstrated a higher water flux and better salt rejection as well as an enhanced antifouling property. More importantly, Au@AgNPs provided an additional function enabling a foulant detection on the membrane surface via surface-enhanced Raman spectroscopy (SERS) as Au@AgNPs could amplify the Raman signals as an SERS substrate. Distinct SERS spectra given by a fouled membrane helped to distinguish different protein foulants from their characteristic fingerprint peaks. Their fouling tendency on the membrane was also revealed by comparing the SERS intensities of mixed foulants on the membrane surface. The Au@AgNPs/PVA/SSA nanocomposite membrane presented here demonstrated the possibility of a multifunction membrane to achieve both antifouling and fouling detection, which could potentially be used in water treatment.
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