摘要
使用γ-氨丙基三甲氧基硅烷(AMPS)对微米级硅胶微粒进行表面改性,制得改性微粒AMPS-SiO2;使改性微粒AMPS-SiO2表面的氨基与溶液中的过硫酸盐构成氧化-还原引发体系,实施了对苯乙烯磺酸钠(SSS)在硅胶微粒表面的高效引发接枝聚合,将阴离子聚电解质聚对苯乙烯磺酸钠(PSSS)接枝于硅胶微粒表面,制得了接枝微粒PSSS/SiO2;采用红外光谱(FTIR)、扫描电子显微镜(SEM)、Zeta电位测定等多种手段对接枝微粒PSSS/SiO2进行了表征.在此基础上重点考察了接枝微粒PSSS/SiO2对抗蚜威和特丁津两种含氮杂环农药分子的吸附特性与吸附机理.研究结果表明,在静电相互作用下,接枝微粒PSSS/SiO2对含氮杂环农药分子具有很强的吸附能力,抗蚜威和的特丁津的吸附容量可分别达到104 mg.g-1及95 mg.g-1,且当水介质的pH=4时,吸附容量最高.吸附容量随温度的升高而降低.接枝微粒PSSS/SiO2既具有阴离子聚电解质PSSS的功能性,又具有硅胶微粒优良的机械性能与热稳定性,在环境治理与保护领域,是一种具有发展前景的功能复合微粒.
Micron-sized silica gel particles were surface-modified with coupling agent γ-aminopropyltrimethoxysilane（AMPS）,obtaining the modified particles AMPS-SiO2.A redox initiating system was constituted by the amino groups on AMPS-SiO2 particles and persulfate in the solution,and the surface-initiated graft-polymerization of Sodium styrene sulfonate（SSS） was performed,resulting in the grafted particles PSSS/SiO2,on which anionic polyelectrolyte PSSS was grafted.The grafted particles PSSS/SiO2 were characterized by several methods,such as infrared spectrum（FTIR）,scanning electron microscope（SEM）,and the determination of Zeta potential.The adsorption character and adsorption mechanism of the grafted particles PSSS/SiO2 towards two heterocyclic pesticides containing nitrogen atom,pirimicarb and terbuthylazine,were mainly examined and investigated.The experiment results show that the grafted particles PSSS/SiO2 have very strong adsorption ability via electrostatic interaction,and the adsorption capacity of pirimicarb and terbuthylazine can get up to 104 mg · g-1 and 95 mg · g-1,respectively.Furthermore,as the medium pH value is 4,the adsorption amount reaches a maximum.The adsorption capacity decreases with the increase of temperature.The grafted particles PSSS/SiO2 not only have the functionality of the polyelectrolyte PSSS,but also possess the excellent mechanical property and heat stability of the inorganic particles,silica gel particles.They are a kind of potential functional composite particles in the environmental management and protect field.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第3期402-409,共8页
Environmental Chemistry
基金
山西省青年科学基金资助项目(20110210215)资助
关键词
聚苯乙烯磺酸钠
硅胶
表面引发接枝聚合
抗蚜威
吸附
sodium polystyrene sulfonate
silica gel
surface-initiated graft-polymerization
pirimicarb
adsorption.
