원문정보
초록
영어
Silica-coated magnetite (Fe3O4) nanoparticles, synthesized by sol-gel method, were modified with iminodiacetic acid (IDA). The products with different particle sizes were obtained by controlling either sonication time or feed rate of tetraethyl orthosilicate（TEOS）during synthesis. A series of tests were then applied to characterize their physical properties. It was found that the particle size increased correspondingly with the increase of sonication time or feed rate of TEOS. Thermal gravimetry analysis suggested higher density coating of -OH groups on small-size silica particles, hence more IDA modified sites on their surfaces. The effects of particle size on adsorption ability were investigated by assessing the adsorption isotherm of bovine serum albumine to Cu2+-charged IDA-nanoparticles of varying sizes. With the increasing particle size, a higher maximum adsorption capacity and a higher dissociation constant was exhibited. This research provided an insight into synthesizing IDA-modified nanoparticles with controllable size and the resulting adsorption properties, thereby providing a simple method capable of addressing the various requirements in a wide range of applications.