MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Ting Ting Li,Hui Xi Li,Qiang Yu,Wen Qing Jia,Shu Ting Li,Wei Zhu,Zhen Chen,Lei Han
It is vital to exploit sensitive and portable means for the reliable assay of acid phosphatase (ACP) activity and its inhibitors screening in clinical diagnosis and drug therapy. Herein, the Pt-Ni alloy nanoparticles (Pt-Ni ANPs) with enhanced oxidase-mimetic activity were successfully prepared and applied to oxidize the achromatous 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB. The oxTMB, as an effective photothermal agent, can transform photon energy to heat under an 808 nm laser illumination. The absorbance and temperature of the reaction solution increased significantly when TMB was oxidized to oxTMB by the oxidase-like Pt-Ni ANPs. However, the ACP can hydrolyze 2-Phospho-L-ascorbic acid trisodium salt (AAP) to produce ascorbic acid (AA), and then the production of AA, as a powerful reductant, can efficiently reduce oxTMB and react with singlet oxygen ( 1 O 2 ) to suppress the oxidase-mimicking activity of Pt-Ni ANPs, causing an obvious decrease in absorption spectrum and temperature of the assay system. A colorimetric and photothermal dual-mode detection platform was established for ACP activity assay by integrating colorimetric and temperature signals. Moreover, the potential application of this strategy was also verified by sensing ACP activity in human serum samples and its inhibitor screening. This dual-mode sensing platform not only improves sensitivity and precision but also meets the needs of diversity detection, which offers new insights for efficient monitoring of ACP activity and inhibitor screening in resource-poor settings.
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高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Delong Yu,Guoquan Zhang,Xiaoli Lv,Xiaochen Xu,Fenglin Yang
Achieving efficient NH 4 + -N degradation into harmless N 2 and simultaneous harvesting hydrogen energy is of great significance for protecting aquatic ecosystems and alleviating energy shortages. Herein, a photoelectrochemical-chlorine (PEC-Cl) system was developed aiming to selective converting ammonia to N 2 with simultaneous H 2 evolution in a wide pH range of 3–13. The Pt decorated black TiO 2 nanotube arrays (Pt/BTNAs) with sufficient oxygen vacancies defects and the enhanced PEC properties were synthesized as the bifunctional electrode. The parameters optimization illustrated high N 2 selectivity (88 %) and H 2 yield rate (67.5 μmol cm -2 h -1 ) at pH 9. The ClO • derived from the cross reactions between active chlorine and HO • plays a predominant role in oxidizing ammonia. More importantly, the Gibbs free energy calculation indicated that Pt decorating can also significantly promote the direct electrochemical ammonia oxidation reaction (AOR) on Pt/BTNAs anode. Under alkaline conditions (pH 9–13), the efficient removal and conversion of ammonia into N 2 in the PEC-Cl system was achieved primarily through the direct anodic AOR, with N 2 selectivity (89 %-93 %) and H 2 yield rate (60.9–68.6 μmol cm -2 h -1 ) comparable to those of the ClO • -mediated indirect AOR. This study presents a flexible method for treating high and medium-concentration NH 4 + -N and simultaneously producing H 2 through the synergistic PEC-Cl and direct electrochemical AOR processes, across a wide pH range.
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高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-11
·
IF 5.833
Shen Yanting,Zhao Yuhui,Zhu Yanyan,Wang Jing
A novel colorimetric/fluorescent dual-mode nanosensor for Hg 2+ detection was constructed using expanded mesoporous silica (EMSN)-encapsulated ultrasmall platinum nanoclusters (EMSN@Pt NCs) with improved peroxidase-like and stable fluorescent activities. The sensing technique was based on the mechanism that the peroxidase mimetic activity and fluorescence intensity of EMSN@Pt NCs can be inhibited in the presence of Hg 2+ . In this sensing platform, a linear range of 5–50 nM with a detection limit of 1.78±0.38 nM and quantification limit of 5.93 nM was obtained via fluorescent analysis. A linear calibration curve from 0.25 to 200 nM with a detection limit of 8.25±0.51 nM and quantification limit of 27.47 nM was achieved via colorimetric analysis. The proposed dual-mode probe possesses excellent selectivity and reliability for Hg 2+ detection, which can function as an efficient nanosensor for the quantitative determination of Hg 2+ in Pueraria lobata . Graphical abstract
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高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Di Zhu,Huiyuan Ma,Haijun Pang,Lichao Tan,Jia Jiao,Tao Chen
A non-enzymatic nanocomposite of 12-heteropolyacids and CeO 2 @Pt alloy nanoparticles decorated by reduced graphene oxide (RGO), was successfully developed by a facile and eco-friendly route for simultaneous determination of xanthine (XA) and uric acid (UA). The surface morphology and structure of the nanocomposite were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and fourier transform infrared spectroscopy (FT-IR), respectively. And then, the electrochemical properties of the nanocomposite were further examined by differential pulse voltammetry (DPV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The as-prepared nanocomposite exhibited excellent sensing performance towards the determination of UA and XA simultaneously with a widely linear range from 4.43 × 10 −7 M to 4.52 × 10 −4 M and 1.25 × 10 −7 M to 5.73 × 10 −4 M, respectively, along with a relatively low detection limit of 5.13 × 10 −8 M and 1.34 × 10 −8 M, mainly because of the synergistic effect of the active components. Meanwhile, the nanocomposite also revealed a superb anti-interference property, as well as good stability and reproducibility. What's more, the nanocomposite was applied in detecting XA and UA in real samples with satisfactory results, demonstrating that the nanocomposite of PMo 6 W 6 /RGO-CeO 2 @Pt would be a good potential candidate sensor for practical detecting xanthine and uric acid.
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高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 9
·1-9
·
IF 5.705
Gou Dan,Xie Guoming,Li Yuxia,Zhang Xin,Chen Hui
The authors describe an electrochemical immunoassay for ultrasensitive determination of the Mycobacterium tuberculosis (MTb) secretory protein MPT64 which is an antigen for early diagnosis of infection with MTb . Protein G was used to immobilize antibodies against MPT64 on a gold electrode. Graphene oxide with its large surface area was used as a carrier to anchor magnetite (Fe 3 O 4 ) and platinum (Pt) nanoparticles. The nanocomposite of type GO@Fe 3 O 4 @Pt was used as a signal reporter with excellent catalytic activity and recyclability. The nanocomposite exhibits peroxidase-like activity for hydrogen peroxide, best at −0.25 V (vs. Ag/AgCl). It works over a wide range of pH values (2–10) and temperatures (25–65 °C). Further signal amplification strategy was accomplished by rolling circle amplification. This voltammetric assay has a linear response to the logarithm of MPT64 concentration in the range from 5.0 fg·mL −1 to 1.0 ng·mL −1 and a detection limit of 0.34 fg·mL −1 (at a signal to noise ratio of 3, for n = 10). The assay can be completed within 4 h. It was successfully applied to the determination of MPT64 in spiked serum samples. Conceivably, the assay has a large potential in providing laboratory evidence for rapid diagnosis of MTb infection.
An electrochemical biosensor was developed for rapid detection of Mycobacterium tuberculosis secretory protein MPT64. The detection signal was synergistically amplified by GO@Fe 3 O 4 @Pt and rolling circle amplification. Phi29: phi29 DNA polymerase; BSA: bovine serum albumin; GO: graphene oxide.
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高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Yongjian Li,Xiufeng Liu,Hansheng Li,Daxin Shi,Qingze Jiao,Yun Zhao,Caihong Feng,Xiaoping Bai,Hongxia Wang,Qin Wu
A novel hierarchical structural hybrid of nitrogen-doped porous carbon (NPC) coated hollow CoSe nanoparticles anchored on nitrogen-doped carbon nanotubes (NCNTs) is enabled from the zeolitic imidazolate framework ZIF-67. In this composite, polypyrrole-derived NCNTs as a nitrogen-rich template effectively alleviates the irreversible aggregation of ZIF-67 derivatives. The hollow CoSe embedded NPC nanoparticles(CoSe@NPC) as high catalytic activity centres endow sufficiently available active sites for the reduction of triiodide, while NCNTs serve as both the bridge and the dispersant for the CoSe@NPC. Moreover, the outstanding catalytic metal-nitrogen bonds(Co-N-C) species take the role of high-speed transport pathway to facilitate transfer of electrons from the carbon skeleton to active sites. Benefiting from the above advantages, the hybrid of CoSe@NPC anchored on NCNTs shows fabulous electrocatalytic activity with an energy conversion efficiency of 7.58%, which is even higher than that of Pt counter electrode (7.27%). More remarkably, the composite also demonstrates a good long-term electrochemical stability in iodine-based electrolyte. The present work proves the rationality of the preparation of ZIFs-derived materials with special structures and their application in dye-sensitized solar cells system.
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高影响因子
ANALYTICAL LETTERS
·
2024
·
IF 1.6
Chunli Fan,Mingying Cao,Qiuju Zheng,Youfa Cheng,Ping Wang,Jinyu Feng
The evaluation of the flow direction of platinum group elements (PGEs) during gold-copper ore mining is challenging due to the uneven distribution and low content. Therefore, it is vital to accurately and simultaneously determine ultra-trace PGEs Pt, Pd, Rh, and Ir in gold mining residue samples. In this study, a method to simultaneously determine ultra-trace Pt, Pd, Rh, and Ir in gold mining residue is reported using Sb–Cu fire assay, microwave digestion, and inductively coupled plasma-mass spectrometry (ICP-MS). The Sb–Cu fire assay was used to enrich Pt, Pd, Rh, and Ir, obtaining Sb–Cu alloy particles that concentrate these elements. An optimal microwave method was employed to digest the Sb–Cu alloy particles. In ICP-MS, the collision reaction interface was used to eliminate the interferences of other elements and improve the accuracy. Moreover, the matrix-matched multi-external standards combined with internal standard calibration were utilized to reduce the error. High concentrations of Au, Ag, and Pb showed no interferences with Pt, Pd, Rh, or Ir determination. The limits of detection for Pt, Pd, Rh, and Ir were 0.018, 0.052, 0.064, 0.035 ng·g−1, respectively, and the relative standard deviation was 5.18, 4.66, 1.55, and 3.17%. Additionally, the determination of Pt, Pd, Rh, and Ir in standard reference materials showed good agreement with the certified values. In summary, a reliable and efficient method is provided to determine various PGEs which is of great significance for gold-copper ore mining.
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高影响因子
HYDROMETALLURGY
·
2023
·
IF 4.7
Haitao Zhou,Kun Huang
In conventional liquid-liquid extraction, Pt(IV) and Pd(II) chloride complex anions PtCl 6 2− and PdCl 4 2− in concentrated hydrochloric acid cannot be separated using simple amine extractants according to the ion association mechanism based on the thermodynamic difference in the interaction of their inner sphere coordinated chloride ions with protonated amine. This study exhibits a novel strategy for enhancing the separation of PtCl 6 2− and PdCl 4 2− anions using thin-layer organic membrane-based laminar flow (TOMLF) extraction by controlling the acidified primary amine N1923 (A-N1923) molecular orientation on the surface of concentrated hydrochloric acid with a laminar shear flow. Experiments revealed that the separation selectivity is primarily determined by the interaction of A-N1923 molecules with the outer sphere-bound water molecules around PtCl 6 2− and PdCl 4 2− anions, and is easily controlled by regulating the A-N1923 molecular orientation on the surface of laminar flow. It is a new phenomenon that has not been previously documented. The evolution of A-N1923 molecular orientation and complexation sites induced by laminar shear flow would result in a controllable spatial geometry recognition, therefore promoting or inhibiting the separation of PtCl 6 2− and PdCl 4 2− anions in concentrated hydrochloric acid. This work is expected to provide new insight into the development of hydration-sphere coordination strategies based upon shear-switch laminar flow for controllable host-guest molecule recognition at a flowing liquid-liquid interface.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Fuling Wang,Xue Liu,Binghan Jiang,Hongyan Zhuo,Wenmiao Chen,Yanli Chen,Xiyou Li
Reducing the loading of Pt precious metal is the promising pathway to positively promote the large-scale application for fuel cells and water electrolysis. In this work, a composite bifunctional electrocatalyst (named Pt@Fe SA -N-C) consisting of the atomically dispersed FeN 4 active sites and Pt nanoparticles (NPs) is successfully prepared for oxygen reduction reaction (ORR) and hydrogen evolution reactions (HER). In the process of synthesizing precursor of Pt(OH) 4 -Fe-Ppy@CNFs, the Fe-Ppy@CNFs was firstly prepared where the highly dispersed Fe 3+ ions were pre-anchored into polypyrrole (PPy) matrixes through in-situ polymerization on the surface of cellulose nanofibers (CNFs) and then Pt(OH) 4 nano-particles were deposited on Fe-Ppy@CNFs through adjusting the pH of the solution by urea hydrolysis to obtain the Pt(OH) 4 -Fe-Ppy@CNFs. Compared with the commercial 20 wt.% Pt/C, the obtained Pt@Fe SA -N-C possesses 5.5 wt.% low Pt loading. The strong synergistic effect of dual active sites between Pt NPs and FeN 4 on one-dimensional (1D) Fe SA -N-C support with a large surface area ensures effectively exposure of Fe and especial Pt active sites in the Pt@Fe SA -N-C. Both ORR and HER activities of the Pt@Fe SA -N-C were greatly improved in acid and alkaline media, even outperforming the commercial 20 wt.% Pt/C. Furthermore, the Pt@Fe SA -N-C shows an unordinary stability, with no obvious decrease in the current density after 5000 and 1000 cycles of accelerated durability tests (ADTs) for ORR and HER processes, respectively. This work highlights a preparation strategy for the synergistic effect between low-loading Pt precious metal and non-precious metals in electrocatalytic system.
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高影响因子
危险品化学品经营许可证（带存储）