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Yang Y.,Northwest Normal University | Yang Y.,Key Laboratory of Polymer Materials of Gansu Province | Li Y.,Northwest Normal University | Liu H.,Northwest Normal University | And 4 more authors.
Journal of Chromatography A | Year: 2014

In the present study, a novel approach for rapid electrodeposition on an etched stainless steel (SS) wire followed by self-assembled monolayer (SAM) was proposed for the fabrication of solid-phase microextraction (SPME) fiber. The etched SS wire offers a rough surface structure for subsequent electrochemical deposition of gold nanoparticles (AuNPs). As a result, uniform AuNPs coating was tightly attached to the etched SS wire substrate. After SAM of 1,8-octanedithiol onto AuNPs coating via Au-S bonding, a unique floccular structure with extremely large surface area was obtained for the fabricated fiber. The mercaptooctyl groups modified AuNPs coated etched SS fiber (C8-S-AuNPs/SS) was then assessed for SPME of phthalate esters (PAEs), polychlorinated biphenyls (PCBs), chlorophenols (CPs), ultraviolet (UV) filters, polycyclic aromatic hydrocarbons (PAHs) and substituted anilines coupled to high-performance liquid chromatography with UV detection. This fiber exhibits higher extraction capability and better selectivity for some PCBs, CPs, UV filters and PAHs. Extraction conditions were investigated and optimized for SPME performance of UV filters. Under the optimized conditions, the developed method showed good linearity between 0.10 and 400μgL-1 with corresponding coefficients in the range of 0.9989-0.9998. The limits of detection ranged from 0.025 to 0.056μgL-1. The relative standard deviation for fiber-to-fiber reproducibility of five fabricated fibers was less than 9.4%. The developed method was successfully applied to the preconcentration and determination of trace UV filters from environmental water samples. Furthermore the fabrication of the C8-S-AuNPs/SS fiber can be performed in a highly reproducible manner. This fabricated fiber exhibits good stability and long lifetime, and could be a potential alternative for the conventional fused silica fiber. © 2014 Elsevier B.V. Source


Yang Y.,Northwest Normal University | Yang Y.,Key Laboratory of Polymer Materials of Gansu Province | Guo M.,Northwest Normal University | Zhang Y.,Northwest Normal University | And 6 more authors.
RSC Advances | Year: 2015

A facile and efficient electrodeposition approach for the controllable preparation of dendritic silver nanostructure was developed on an etched stainless steel (ESS) wire. Subsequently, self-assembled of alkyldithiols (HS-Cx-SH, x = 2, 3, 6, 8) was performed on the dendritic Ag coating via Ag-S bonding. The octanedithiol modified Ag nanodendrites (AgNDs) coated ESS fiber (HS-C8-S-AgNDs/ESS) was then assessed for SPME of polycyclic aromatic hydrocarbons (PAHs), ultraviolet (UV) filters, polychlorinated biphenyls (PCBs), chlorophenols (CPs), phthalate esters (PAEs) and substituted anilines coupled to high-performance liquid chromatography with UV detection (HPLC-UV). This fiber exhibits higher extraction capability and good selectivity for PAHs, UV filters, PCBs and triclosan compared to CPs, PAEs and substituted anilines. In particular, the microextraction conditions were investigated and optimized for SPME performance of UV filters. Under the optimized conditions, the developed method showed good linearity between 0.30 and 400 μg L-1 with corresponding correlation coefficients in the range of 0.9973-0.9986. The limits of detection ranged from 0.05 to 0.12 μg L-1. The relative standard deviation for fiber-to-fiber reproducibility of five fabricated fibers in the same batch was less than 8.2%. The expanded uncertainties were below 6.9% (coverage factor k = 2). The developed method was practically applied to the preconcentration and determination of trace UV filters from real environmental water samples. © The Royal Society of Chemistry 2015. Source


Zhang Y.,Northwest Normal University | Song W.,Northwest Normal University | Yang Y.,Key Laboratory of Polymer Materials of Gansu Province | Guo M.,Northwest Normal University | And 4 more authors.
Analytical Methods | Year: 2015

A novel organic-inorganic composite coated fiber was developed by direct chemical deposition of Au nanoparticles (AuNPs) followed by self-assembly of mercaptoundecanol using an etched stainless steel (ESS) wire as a supporting substrate for selective solid-phase microextraction (SPME). The ESS wire offered a very large contact surface for the subsequent growth of AuNPs in chloroauric acid solution. As a result, a uniform AuNP coating with a cedar-like structure was formed on the ESS wire and used as an alternative substrate for self-assembly of mercaptoundecanol (HS-C11-OH) via Au-S bonding. The mercaptoundecanol modified AuNP coated ESS (ESS/AuNPs-S-C11-OH) fiber was then assessed for SPME of ultraviolet filters, phthalic acid esters and polycyclic aromatic hydrocarbons (PAHs) coupled to high-performance liquid chromatography with UV detection. This fiber exhibits high extraction capability and better selectivity for PAHs. Moreover, main parameters affecting extraction were investigated and optimized. Under the optimized conditions, the developed method showed good linearity between 0.05 and 300 μg L-1 with corresponding coefficients in the range of 0.9973-0.9992. The limits of detection ranged from 0.010 to 0.044 μg L-1. The relative standard deviation for the fiber-to-fiber reproducibility of five fabricated fibers was less than 6.52%. The developed method was successfully applied to the preconcentration and determination of PAHs from environmental water samples. Furthermore, the preparation of the ESS/AuNP-S-C11-OH fiber can be performed in a highly reproducible manner. This fabricated fiber exhibits high stability and withstands at least 200 extraction and desorption replicates. This journal is © The Royal Society of Chemistry. Source


Zeng J.,Northwest Normal University | Zeng J.,Key Laboratory of Polymer Materials of Gansu Province | Zhang W.,Northwest Normal University | Liao S.,Institute of Gansu Medical Science Research | And 4 more authors.
Advanced Materials Research | Year: 2011

A polymerization between 1, 4-diaminobenzene (PPD) and acrylic acid catalyzed by Horseradish Perodxidase (HRP) in an water buffer will be described in this article. The effects of the concentration of H2O2, the ratio of the acrylic acid to PPD, the pH of the buffer, and the reaction time of polymerization were investigated. Compared with conventional methods, the synthesis is simple and the conditions are mild. The conductivity, UV-vis spectra, FT-IR spectra, X-ray photoelectron spectroscopy (XPS), and the thermo-gravimetric analysis (TGA) of the resulting polymer were investigated also. The results show that the synthesized polymer (PAnI) is a self-doped poly(1, 4-diaminobenzene-acrylic acid) with 1, 4-disubstituted aromatic ring, and a higher electro-activity, water-solubility, its decomposition temperature is 498.8 °C. Source


Li P.,Key Laboratory of Eco Environment Related Polymer Materials | Li P.,Key Laboratory of Polymer Materials of Gansu Province | Li P.,Northwest Normal University | Zhang Y.-M.,Key Laboratory of Eco Environment Related Polymer Materials | And 11 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2012

A novel and sensitive anion receptor 3, bearing Schiff base structure, nitrophenyl azobenzol and carboxyl groups, was developed and characterized as a single chemosensor for the recognition of HSO 4 - anion. The different responses of UV-vis spectra and color changes of 3 could be applied to the recognition for HSO 4 - over other anions such as F -, CI -, Br -, I -, AcO -, H 2PO 4 - and CIO 4 - by the naked eye. Furthermore, the anion binding interaction of receptor-anion was also studied using UV-vis and 1H NMR titration which revealed that 3 displayed a remarkable binding ability for the HSO 4 - with an association constant K a = 6.59 × 10 4 M -1. And the detection limitation of HSO 4 - with the receptor 3 was 2.0 × 10 -6 mol L -1 in aqueous solution. Most importantly, the qualitative detection of HSO 4 - using receptor 3 was attempted with test kit which was made from receptor 3. © 2012 Published by Elsevier B.V. All rights reserved. Source

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