Artículo
Synthesis and Characterization of TiO2 Modified with olystyrene and Poly(3-chloro-2-hydroxypropyl Methacrylate) as Adsorbents for the Solid Phase Extraction of Organophosphorus Pesticides
Autor
ALEJO MOLINA, ENRIQUE MANUEL; 42116
VILCHIS NESTOR, ALFREDO RAFAEL; 161073
MUÑOZ RODRIGUEZ, DAVID; 156
CARRERA FIGUEIRAS, CRISTIAN; 201869
ALEJO MOLINA, ENRIQUE MANUEL
VILCHIS NESTOR, ALFREDO RAFAEL
MUÑOZ RODRIGUEZ, DAVID
CARRERA FIGUEIRAS, CRISTIAN
Institución
Resumen
ARTICULO DE INVESTIGACION EN REVISTA INDEXADA Novel hy br i d Ti O2 particles were developed and assessed as an adsorbent for solid phase extraction (SPE) of organophosphorus pesticides (fensulfothion, parathion methyl, coumaphos, and diazinon) from spiked water. Th sol-gel method was used to synthesize TiO2 particles, which were coated with free-radical polystyrene (PS) and poly(3-chloro-2-hydroxypropyl methacrylate) (PClHPMA) polymers. Particle structures were determined via Fourier transform infrared spectroscopy to confim that the polymers were successfully anchored to the TiO2 particles. Thrmogravimetric analysis was conducted to determine organic and inorganic matter in TiO2-PS and TiO2-PClHPMA particles showing results of 20 : 80 wt/wt% and 23 : 77 wt/wt%, respectively. SEMEDS and X-ray diffaction test were conducted to determine the morphology and semielemental composition of the particles showing amorphous characteristics. By observing the contact angle, particles coated with PClHPMA were determined to be more hydrophilic than TiO2-PS particles. Th pore size distributions obtained from the N2 adsorption-desorption isotherms were 0.150 and 0.168 cm3g−1. Th specifi surface area (BET) was 239.9 m2g−1 for TiO2-PS and 225.7 m2g−1 for TiO2-PClHPMA. Th synthesized particles showed relatively high yields of adsorption in SPE. Th pesticide recoveries obtained by high performance liquid chromatography ranged from 6 to 26% for TiO2-PClHPMA and 44 to 92% for TiO2-PS. Consejo Nacional de Ciencia y Tecnología, CONACyT (83390)