Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 11, Pages 4977-4981Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm15129d
Keywords
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Funding
- National Natural Science Foundation of China [21075047, 21172088]
- Special Fund for Basic Scientific Research of Central Colleges [CCNU11C01002, CCNU10A02005]
- NIH from the National Institute of Environmental Health Sciences (NIEHS) [U54 ES16015]
- US-DOE [DE-AC05-76RL01830]
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Au-ZrO2-SiO2 nanocomposite spheres were synthesized and used as selective sorbents for the solid-phase extraction (SPE) of organophosphorous agents. A non-enzymatic electrochemical sensor based on a Au-ZrO2-SiO2 modified electrode was developed for the selective detection of organophosphorous pesticides (OPs). The Au-ZrO2-SiO2 nanocomposite spheres were synthesized by the hydrolysis and condensation of zirconium n-butoxide (TBOZ) on the surface of SiO2 spheres and then the introduction of gold nanoparticles on the surface. Transmission electron microscopy and X-ray photoelectron spectroscopy were performed to characterize the formation of the nanocomposite spheres. Fast extraction of OP was achieved by the Au-ZrO2-SiO2 modified electrode within 5 min via the specific affinity between zirconia and the phosphoric group. The assay yields a broad concentration range of paraoxon-ethyl from 1.0 to 500 ng mL(-1) with a detection limit of 0.5 ng mL(-1). This selective and sensitive method holds great promise for the enrichment and detection of OPs.
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