Surfaces and Interfaces
·
2026
·
IF 6
Yujiao Zou,Bo Ge,Yanhui Hu,Yulu Yang,Ni Li,Yili Zhao
The high catalytic performance induced by the photothermal conversion effect holds immense potential in environmental purification, attracting widespread attention. Herein, the synthesis of PVA/PEI/Au nanofibers was successfully achieved, and they were applied as plasmonic photothermal catalysts to facilitate the reduction of 4-nitrophenol (4-NP). The photothermal performance of nanofibers loaded with different concentrations of Au nanostars (NSs) was compared under near-infrared (NIR) laser irradiation. Remarkably, at low laser power densities under NIR irradiation, the PVA/PEI/Au nanofibers catalyzed the reduction of 4-NP, resulting in a 1.5-fold increase in reaction rate and achieving a 98% conversion efficiency within 8 min. Additionally, the nanofibers demonstrated excellent recyclability, maintaining a conversion efficiency exceeding 97% over six consecutive cycles. The PVA/PEI/Au nanofibers hold significant promise for the practical application of electrospun nanofibers in the photothermal degradation of environmental pollutants.
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Environmental Science-Nano
·
2026
·
IF 5.6
Yufei Zhao,Xiangrui Wang,Yibing Hou,Zhejie Hou,Wenhong Fan
Silver nanoparticles (AgNPs) are widely used in industrial production and daily life, and their potential risks to aquatic environments deserve further attention. However, contributions of AgNPs and their released ions in the biodynamic processes within aquatic organisms remained largely unknown. To address this, this study fabricated various Au@AgNPs with different surface coatings to clarify key factors controlling the biodynamics of AgNPs under direct exposure in the water phase versus indirect exposure through the food chain (Escherichia coli-Tetrahymena thermophila). Au@AgNPs, a core-shell material, could well distinguish the bioaccumulation and transfer processes of particulate Ag and released Ag+. It is demonstrated that surface coating significantly influenced the biodynamics and trophic transfer of Au@AgNPs by regulating their surface charge. In water-phase exposure, surface coatings did not directly alter the internalization and excretion processes of AgNPs. Instead, they significantly modulated the dissolution behavior of the internalized particles and excretion rate of released Ag+ to induce the discrepancies in Ag accumulation ultimately. During trophic transfer, ethylene imine polymer-coated Au@AgNPs transferred from E. coli to T. thermophila in relatively intact particle form, exhibiting the highest relative transfer efficiency for NPs. In contrast, polyvinylpyrrolidone-Au@AgNPs showed the lowest transfer efficiency for both Ag and NP, indicating lower bioavailability, reduced transformation, and higher excretion efficiency. In conclusion, this study demonstrates that surface coating modulates AgNPs biodynamics and transport processes in aqueous exposure and trophic transfer pathways by itself and regulating surface charge. When assessing nanomaterial ecological risks, it is essential to consider both the differential behavior of particulate and ionic forms and the potential amplification effects through trophic transfer.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Dexu Liu,Keyu Liu,Huifu Chi,Shan Gao,Shuangqing Fu,Wei Li,Honglei Zhang
Poly(3-hydroxybutyrate) (PHB) has emerged as a promising biodegradable polymer with extensive potential for diverse applications. When modified with chitosan (CS), PHB demonstrates enhanced metal-loading capabilities, significantly expanding its utility in environmental fields. In this study, a green heterobimetallic gold (Au) and palladium (Pd) catalyst (designated as Au/Pd@PHB-CS), was synthesized through a sequential coordination reduction process on the surface of the PHB-CS nanosphere. The resulting bimetallic nanoparticles on the nanosphere predominantly exhibit a particle size of approximately 4.0 ± 0.9 nm and expose a substantial number of highly active crystal planes. Catalysts possess adsorption capacities for three pollutants: congo red (CR), methylene blue (MB) and 4-nitrophenol (4-NP). Besides, catalysts with low bimetallic loading of Au (0.11 wt%) and Pd (0.11 wt%) show significant removal efficiencies for the three pollutants. Notably, in the degradation of CR, the catalyst exhibits complete reduction of CR with exceptionally fast reaction kinetics. Furthermore, the catalyst maintains a high catalytic activity (95%) after multiple cycles of utilization. Compared to monometallic Au or Pd catalysts, bimetallic catalysts exhibit significantly enhanced reaction activity due to the synergistic interaction between the two metal components. This improved catalytic performance underscores the potential of PHB-based materials as effective catalyst supports, broadening their research and application prospects in catalysis.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Huasheng Lai,Gongke Li,Zhuomin Zhang
A bioinspired Au@Ag nanodome-cones array (Au@Ag NDCA) surface-enhanced Raman scattering (SERS) chip was developed for efficient residue analyses of food samples. The cicada wing inspired Au@Ag NDCA chip was fabricated by a bottom-up method, Au nanocones array was firstly grown onto nickel foil by displacement reaction and cetyltrimethylammonium bromide guidance growth, and then silver shell with controllable thickness was coated onto the Au nanocones array by magnetron sputtering . The Au@Ag NDCA chip exhibited good SERS performances with high enhancement factor of 1.2 × 10 8 , good uniformity with relative standard deviation (RSD) less than 7.5% (n = 25), good inter-batch reproducibility with RSD less than 9.4% (n = 9), and long-term stability over 9 weeks. By adapting a minimized sample preparation, Au@Ag NDCA chip combined with a 96-well plate could realize high-throughput SERS analyses of 96 samples with average analysis time less than 10 min. The substrate was applied for quantitative analyses of two food projects. One was 6-benzylaminopurine auxin residue in sprout samples with detection limit of 38.8 μg/L, recoveries of 93.3–105.4% and RSDs of 1.5–6.5%, and the other was an edible spice of 4-amino-5,6-dimethylthieno (2,3-d) pyrimidin-2(1H)-one hydrochloride additive in beverage samples with detection limit of 18.0 μg/L, recoveries of 96.2–106.6% and RSDs of 3.5–7.9%. All the SERS results were well confirmed by conventional high-performance liquid chromatographic methods with relative errors less than 9.7%. The robust Au@Ag NDCA chip exhibited good analytical performances possessed great potential for convenient and reliable analyses of food quality and safety.
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Nanoscale Horizons
·
2023
·Vol. 8
·期 6
·812-826
·
IF 9.7
Junqing Ye,Meizan Jing,Yu Liang,Wenjin Li,Wanting Zhao,Jianying Huang,Yuekun Lai,Weiyu Song,Jian Liu,Jian Sun
Exploring eco-friendly and cost-effective strategies for structure engineering at the nanoscale is important for boosting heterogeneous catalysis but still under a long-standing challenge. Herein, multifunctional polyphenol tannic acid, a low-cost natural biomass containing catechol and galloyl species, was employed as a green reducing agent, chelating agent, and stabilizer to prepare Au nanoparticles, which were dispersed on different-shaped CeO2 supports (e.g., rod, flower, cube, and octahedral). Systematic characterizations revealed that Au/CeO2-rod had the highest oxygen vacancy density and Ce(III) proportion, favoring the dispersion and stabilization of the metal active sites. Using isopropanol as a hydrogen-transfer reagent, deep insights into the structure–activity relationship of the Au/CeO2 catalysts with various morphologies of CeO2 in the catalytic nitrobenzene transfer hydrogenation reaction were gained. Notably, the catalytic performance followed the order: Au/CeO2-rod (110), (100), (111) > Au/CeO2-flower (100), (111) > Au/CeO2-cube (100) > Au/CeO2-octa (111). Au/CeO2-rod displayed the highest conversion of 100% nitrobenzene and excellent stability under optimal conditions. Moreover, DFT calculations indicated that nitrobenzene molecules had a suitable adsorption energy and better isopropanol dehydrogenation capacity on the Au/CeO2 (110) surface. A reaction pathway and the synergistic catalytic mechanism for catalytic nitrobenzene transfer hydrogenation are proposed based on the results. This work demonstrates that CeO2 structure engineering is an efficient strategy for fabricating advanced and environmentally benign materials for nitrobenzene hydrogenation.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Xiaorong Zhao,Qiulan Li,Hong Li,Yijie Wang,Feijian Xiao,Dezhi Yang,Qinghai Xia,Yaling Yang
In this work, cerium-doped carbon dots (Ce-CDs) both as a reducing agent and template hybrid gold nanoparticles (AuNPs) with weak oxidase-like (OXD) activity was synthesized for the detection of Hg 2+ and aflatoxin B 1 (AFB 1 ). The AuNPs can catalyze efficiently mercury ion (Hg 2+ ) reduction to the metallic (Hg 0 ) to form Au-Hg amalgam (Au@HgNPs). The obtained Au@HgNPs with strong OXD-like activity oxidize without Raman-active leucomalachite green (LMG) into the Raman-active malachite green (MG) and simultaneously as the SERS substrates by the formed Raman “hot spot” through MG-induced Au@HgNPs aggregation. While AFB 1 was introduced resulting in the SERS intensity decreasing due to Hg 2+ with AFB 1 via carbonyl group to inhibit the aggregation of Au@HgNPs. The work paves a new path for the design of a nanozyme-based SERS protocol for tracing Hg 2+ and AFB 1 residues in foodstuff analysis.
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FOOD AND AGRICULTURAL IMMUNOLOGY
·
2022
·
IF 3.268
Peizhen Li,Xiuhua Xia,Jiannan Chen,Hang Yu,Yunfei Xie,Yahui Guo,Weirong Yao,He Qian,Yuliang Cheng
Gold-coated silver core–shell nanoparticles (Ag@Au NPs) have been widely used for SERS analysis due to plasmon resonance performances. However, it is a great challenge to fabricate Ag@Au core–shell structures with specified morphology. In this paper, the size and shape of Ag NPs (core) were precisely controlled by a seed-mediated approach, and then the gold shell was completely coated on under the strong reduction of ascorbic acid, resulting in Ag@Au NPs with highly regulated morphology. The obtained Ag@Au NPs achieved a similar or even better SERS enhancement factor (EF) (up to 5.7 × 107) compared to Ag NPs, but significantly higher stability. For the rapid SERS detection of nitrofurantoin metabolite AHD, a limit of detection (LOD) as low as 1 × 10−10 M and a wide linear range from 1 × 10−4 to 1 × 10−8 M were obtained. Furthermore, recoveries for crayfish samples were from 90.5% to 108%, indicating a good performance of the presented method in real sample detection.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoqing Jiang,Jie Zou,Yongjian Ni,Yuheng Wang,Xianwei Qian,Xuebin Li,Shihao Wei,Yuanjie Su,Guangzhong Xie,Mingjun Zhou,Jiawen Jian
The catalytic activity of an oxygen-pumping electrode is very important to the performance of amperometric NO x (NO and NO 2 ) sensors. To enhance the stability of electrochemical NO x sensors based on Pt electrodes, we fabricated sensitive electrodes of Pt-based materials doped with small and different Au contents on 8% mol Y 2 O 3 -stabilized ZrO 2 (8YSZ) solid electrolyte substrates by screen printing and high-temperature co-firing. The effects of Au on the porous Pt electrode’s catalytic activity and long-term stability were investigated, and the results are as follows. First, the catalytic capacity of the Pt–Au alloy electrode decreases with increasing Au content due to the inhibition of the oxygen adsorption on Au, which decreases the amount of oxygen participating in the reaction at triple-phase boundaries (TPBs). Second, the catalytic ability of the alloy electrode decreases exponentially with aging time due to the reduction in the length of TPBs caused by the significant reduction in the number of holes in the electrode, and the oxidation of Pt. In addition, the conductivity decay rate of the electrode decreases with increasing Au doping. This indicates that Pt-based electrodes doped with varying Au contents, long-term, and high-temperature aging have notably regular effects on the catalytic activity of oxygen-pumping electrodes, for which we have developed a model of Au passivation and the synergistic effect of aging time on the activity of Pt-based oxygen-pumping electrodes.
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AICHE JOURNAL
·
2022
·Vol. 69
·期 5
·e17999
·
IF 4.167
Dong Lin,Yang Xu,Xiuhui Zheng,Wei Sheng,Zhenyi Liu,Yinglong Yan,Yu Cao,Yibin Liu,Xiang Feng,De Chen,Chaohe Yang
Regulating the microenvironment of active sites is crucial to boost the performance of direct propene epoxidation with H 2 and O 2 . Herein, the enhanced surface transfer of H 2 O 2 intermediates was first achieved by sodium-decorated Au-Ti bifunctional active sites. Combined with multi-techniques (e.g., operando UV–vis–NIR system, DFT studies and quantitative model calculations), it is found that the sodium-decorated silanols (Si-ONa species) on the TS-1 support enhance the formation of Ti-OOH intermediates by restraining H 2 O 2 decomposition. In addition, sodium-decorated silanols improves the desorption of propylene oxide, suppressing its ring-opening and formation for the carbonaceous deposits. Moreover, the sodium-decorated Au nanoparticles with smaller diameter and higher electron density further strengthen O 2 adsorption and boost the H 2 O 2 formation. This work not only provides fundamental understandings on the microenvironment of Au-Ti bifunctional catalysts but also sheds new light on enhancing the performance by boosting the surface molecular transfer.
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ChemNanoMat
·
2023
·Vol. 9
·期 4
·e202200532
·
IF 3.8
Xinbing Jiang,Lu Qiao,Huan Yang,Ben Q Li,Shujiang Ding
Graphical SiO 2 @Au@SiO 2 @QDs nanocomposite with dual-functionality of simultaneous heating and temperature sensing were prepared. The heating is activated by a NIR laser through SPR effect while thermal sensing is accomplished by QDs PL thermometry. These nanocomposites are used as a drug carrier for in vitro chemotherapy-photothermal co-treatment for malignant cells. This paper reports the synthesis of multi-layer SiO 2 @Au@SiO 2 @QDs nanoparticles with a dual-functionality of simultaneous heating and temperature sensing and their applications to in vitro chemo-thermal therapy. The heating is activated by a NIR-light through resonance excitation of surface plasma while in-situ thermal sensing is accomplished by the QDs photoluminescent (PL) effect. These dual function nanoparticles are used as a drug carrier for in vitro chemotherapy-photothermal co-treatment for malignant cells. A comparative study of drug release profiles was performed with and without 808 nm laser irradiation. The drug release rate was accelerated by a rise of temperature, which is induced by plasmonic heat generation associated with Au nanoshells; while the temperature change is monitored by the QD nanoparticles at the same time. The results showed that SiO 2 @Au@SiO 2 @QDs-DOX platform enabled the combination of local specific chemotherapy with external near-infrared (NIR) photothermal therapy and significantly improved the efficacy of cancer treatment. This combined treatment demonstrated synergistic chemotherapeutic-thermal effects compared to chemotherapy or photothermal therapy alone, resulting in higher efficacy.
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Analytical Methods
·
2022
·Vol. 14
·期 48
·5091-5099
·
IF 3.532
Yue Sun,Zihao Xie,Fubin Pei,Wei Hu,Shasha Feng,Qingli Hao,Bing Liu,Xihui Mu,Wu Lei,Zhaoyang Tong
The rapid spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) seriously threatened global public health. Establishing a rapid and sensitive diagnostic test for early detection of the SARS-CoV-2 nucleocapsid protein is urgently required to defend against the pandemic. Herein, an enhanced lateral flow immunoassay (LFIA) was fabricated by trimetallic Au@Pd@Pt core–shell nanozymes for detection of the SARS-CoV-2 nucleocapsid protein. The Au@Pd@Pt nanozymes (Au@Pd@Pt NZs) synthesized via a one-pot method, with a dendrite morphology and uniform particle size, showed excellent peroxidase-like activity. Due to the perfect enzyme-like catalytic activity toward 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of hydrogen peroxide (H2O2), the catalytic signal could be generated even by a tiny amount of Au@Pd@Pt NZs accumulated on the test strip. Therefore, rapid detection with higher sensitivity was achieved. The Au@Pd@Pt NZs-based LFIA provided a quantitative range of 0.05–100 ng mL−1 with a limit of detection of 0.037 ng mL−1, which was 17-fold lower than the LFIA without enhancement. The average recoveries from spiked samples were in the range of 92.5–107.9% with relative standard deviations all less than 4%, indicating the reliability and repeatability of the proposed LFIA. Additionally, the proposed LFIA could report results within 30 min using a microplate reader. In conclusion, the Au@Pd@Pt NZs-LFIA is a rapid, simple, and sensitive method for detecting the SARS-CoV-2 nucleocapsid protein.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 6
·921-927
·
IF 2.726
Li Lingling,Xu Jinhui,Liang Xi,Wu Xueting,Wang Xiao,Song Shuyan,Zhang Hongjie
G old(Au) nanoclusters supported on various supports have been widely used in the fields of energy and catalysis. However, the poor thermal stability of Au nanoclusters on the support interface usually leads to a reduction or even loss of catalytic activity. Herein, we used an in situ reduction method to synthesize Au nanoclusters on ceria(CeO 2 ) carriers. In this method, sulfhydryl groups were used to modify CeO 2 nanospheres first, and then Au clusters with an average diameter of 1.5 nm were grown on the surface of ceria reduced with sodium borohydride. The presence of the Au-S-Ce structure enhances the electron transfer efficiency, making the material exhibit high CO oxidation activity at room temperature. Furthermore, due to the strong binding energy of S and Au, the material exhibits a high stability for long time running process. This strategy provides an idea for designing stable and active supported ultrasmall Au nanoclusters catalytic materials.
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