Xiao-jiao Chen

Lanzhou University, Kao-lan-hsien, Gansu Sheng, China

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Publications (4)18.76 Total impact

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    ABSTRACT: In this paper, a simple and green route for in situ growth of Au shell or grown Au NPs attached on the graphene oxide-iron oxide nanocomposite (GO-Fe3O4) was established. After functionalized with amino groups, the GO-Fe3O4 nanocomposites can adsorb negatively charged Au nanoparticles (Au NPs) which acted as gold seeds. Then the HAuCl4 solution provides gold precursor with glucose serving as reducing reagent, whereby the crystal growth leads to the in situ growth of Au shell or grown Au NPs attached on the surface of GO-Fe3O4, and a highly efficient catalyst denoted as GO-Fe3O4-Au NPs(G) was obtained. The prepared nanocomposites were characterized and their catalytic activity was evaluated using the reduction of 4-nitrophenol (4-NP) as a model reaction. It shows that the GO-Fe3O4-Au NPs(G) possess high catalytic performance for reduction of 4-NP with conversion rate of 100% within 100 s. Furthermore, the new catalyst can be stored for more than one month, easily recovered and reused at least for ten cycles. Comparing with the nanocomposites without crystal growth, the formation of Au shell or Au NPs attachment on the support via in situ growth approach not only apparently improves catalytic activity, recyclability but also increases their stability.
    Chemical Engineering Journal 01/2014; 236:1-8. DOI:10.1016/j.cej.2013.09.080 · 4.06 Impact Factor
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    ABSTRACT: In this work, we first discover that 3,3',5,5'-tetramethylbenzidine (TMB) can be used as a novel chromogenic agent for sensitive, convenient and rapid determination of benzoyl peroxide (BPO) in wheat flour. A simple colorimetric method based on the color reaction between TMB and BPO was developed. Factors influencing the color reaction were examined. Under the optimum conditions, the calibration linear range for detecting BPO was 0.67-16.00 mu g mL(-1) with a detection limit of 0.45 mu g mL(-1) in aqueous solution. The method was successfully applied to detect BPO in wheat flour, with recoveries between 97% and 118%. More significantly, the existence of BPO can be evaluated by the naked eye easily without the aid of any instrumentation and requiring no sample preparation operation. TMB was proved to be an efficient and robust chromogenic reagent for the detection of BPO in wheat flour.
    RSC Advances 01/2013; 3(48):26307. DOI:10.1039/c3ra44664f · 3.71 Impact Factor
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    ABSTRACT: In this paper, we established a new on-line method using micelle to solvent stacking (MSS) technique combining with large amount sample electrokinetic stacking injection (LASEKSI) for the analysis of cationic molecules. In this MSS-LASEKSI, by modulating the integral EOF across the capillary, a equilibrium state was formed and can be maintained for a long time, leading to the continuous stacking of the analytes on the basis of MSS. Thereby, an extremely large amount sample was permitted to be injected into the capillary and then an improved enrichment fold can be achieved comparing with the each case. The variables affecting the performance of MSS-LASEKSI were investigated and discussed. Under the optimized conditions, 6.3×10(3)- and 6.4×10(2)-fold enrichment in peak heights upon normal CZE method (injected at 0.5psi for 3s) and number of plates of 2.9×10(6) and 6.5×10(5) were attained for berberine and theophylline, respectively. The developed method described here may provide prospects for exploiting a new concentration technique to achieve higher enrichment factor.
    Journal of Chromatography A 09/2012; 1265. DOI:10.1016/j.chroma.2012.09.082 · 4.26 Impact Factor
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    ABSTRACT: In this report, graphene oxide-Fe(3)O(4) magnetic nanocomposites were demonstrated to possess intrinsic peroxidase-like activity and enhanced affinity toward H(2)O(2). The nanocomposites retain their magnetic properties and can be effectively separated by a magnet. Significantly, they were proved to be novel peroxidase mimetics which could quickly catalyze oxidation of the peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H(2)O(2), producing a blue-colored solution. Kinetic analysis indicates that the catalytic behavior is in accord with typical Michaelis-Menten kinetics and follows a ping-pong mechanism. On the basis of the high activity, the reaction provides a simple, sensitive and selective method for colorimetric detection of glucose in diabetic urine.
    Nanoscale 05/2012; 4(13):3969-76. DOI:10.1039/c2nr12109c · 6.74 Impact Factor

Publication Stats

61 Citations
18.76 Total Impact Points

Institutions

  • 2012–2014
    • Lanzhou University
      • State Key Laboratory of Applied and Organic Chemistry
      Kao-lan-hsien, Gansu Sheng, China