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New sol-gel silica nanoparticles coated cyanopropyltriethoxysilane as alternative solid phase extraction sorbent for organophosphorus pesticides

机译:新型溶胶-凝胶二氧化硅纳米粒子包覆的氰丙基三乙氧基硅烷作为有机磷农药的替代固相萃取吸附剂

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摘要

Sorbents based on silica are widely used in solid phase extraction (SPE). The most common SPE material is C18.Recently nanoparticleshave gained interest as sorbent materials for analytical purpose. In this study silica-based nanoparticles with polar and non-polar groups were synthesized using cyanopropyltriethoxysilane (CNPrTEOS) and tetraethoxysilane (TEOS) as precursor in the presence of ammonia solution as catalyst and ethanol as solvent via sol-gel technology. The sol-gel SiO2-NPs-CNPrTEOS was used for the simultaneous extraction of three organophosphorus pesticides (OPPs) of different polarity namely dicrotophos, diazinon and chlorpyrifos prior to LC-UV detection at 270 nm. The sorbent produced was characterized using FTIR, FESEM, nitrogen gas adsorption and TGA. The surface area and average pore diameter of the sorbent are 570 m2 g-1 and 31Å (mesoporous), respectively. The average particle size of SiO2-NPs-CNPrTEOS is 54 nm. The mesoporous SiO2-NPs-CNPrTEOS showed superior extraction capability for the polar dicrotophos and also for the non-polar diazinon and chlorpyrifos compared to commercial cyano SPE. The new SiO2-NPs-CNPrTEOS exhibits high potential as a bipolar sorbent for the simultaneous extraction of polar and non-polar OPPs. Keywords Sol-gel, Solid phase extraction, Nanoparticles sorbent, Cyanopropyltriethoxysilane, Tetraethoxysilane, Organophosphorus pesticides, Liquid chromatography-UV detection.
机译:基于二氧化硅的吸附剂被广泛用于固相萃取(SPE)。最常见的SPE材料是C18。近来,纳米颗粒已成为用于分析目的的吸附材料。在这项研究中,使用氰基丙基三乙氧基硅烷(CNPrTEOS)和四乙氧基硅烷(TEOS)作为前体,在氨溶液作为催化剂和乙醇作为溶剂的情况下,通过溶胶-凝胶技术合成了具有极性和非极性基团的二氧化硅基纳米颗粒。溶胶-凝胶SiO2-NPs-CNPrTEOS用于同时提取三种极性不同的有机磷农药(OPP),即久效磷,二嗪农和毒死rif,然后在270 nm处进行LC-UV检测。使用FTIR,FESEM,氮气吸附和TGA对生成的吸附剂进行表征。吸附剂的表面积和平均孔径分别为570 m2 g-1和31Å(中孔)。 SiO2-NPs-CNPrTEOS的平均粒径为54 nm。与市售氰基SPE相比,介孔SiO2-NPs-CNPrTEOS对极性久效磷以及非极性二嗪农和毒死rif均具有优异的提取能力。新型SiO2-NPs-CNPrTEOS作为双极性吸附剂具有很高的潜力,可同时萃取极性和非极性OPP。关键词溶胶-凝胶固相萃取纳米颗粒吸附剂氰丙基三乙氧基硅烷四乙氧基硅烷有机磷农药液相色谱-紫外检测

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