期刊
NANOSCALE
卷 6, 期 23, 页码 14254-14261出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr04430d
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资金
- National Natural Science Foundation of China [20977074, 21175115, 21475055]
- Program for New Century Excellent Talents in University [NCET-11 0904]
- Outstanding Youth Science Foundation of Fujian Province, China [2010J06005]
- Science & Technology Committee of Fujian Province, China [2012Y0065]
TiO2 photocatalysis and colorimetric detection are coupled with thin layer chromatography (TLC) for the first time to develop a fully integrated analysis system. Titania@polystyrene hybrid microspheres were surface modified with ascorbic acid, denoted AA-TiO2@PS, and used as the stationary phase for TLC. Because the affinity between AA-TiO2@PS and organophosphorus pesticides (OPs) was different for different species of OPs (including chlopyrifos, malathion, parathion, parathion-methyl, and methamidophos), OPs could be separated simultaneously by the mobile phase in 12.0 min with different Rf values. After surface modification, the UV-vis wavelength response range of AA-TiO2@PS was expanded to 650 nm. Under visible-light irradiation, all of the OPs could be photodegraded to PO43- in 25.0 min. Based on the chromogenic reaction between PO43- and chromogenic agents (ammonium molybdate and ascorbic acid), OPs were quantified from color intensity images using a scanner in conjunction with image processing software. So, AA-TiO2@PS was respectively used as the stationary phase of TLC for efficient separation of OPs, as a photocatalyst for species transformation of phosphorus, and as a colorimetric probe for on-field simultaneous visual detection of OPs in natural water. Linear calibration curves for each OP ranged from 19.3 nmol P L-1 to 2.30 mu mol P L-1. This integrated analysis system was simple, inexpensive, easy to operate, and sensitive.
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