中文摘要：

合成具有羧酸端基的功能化硅烷,以该硅烷为表面改性剂,对以共沉淀法制备的超顺磁Fe3O4纳米粒子（SPION）进行改性,获得表面为羧酸官能团的SPION纳米粒子。以扫描电子显微镜（SEM）、红外光谱（FT-IR）、振动样品磁强计（VSM）等手段对改性SPION进行表征。结果表明：改性的纳米粒子的比饱和磁化强度为44.4emu/g,在外加磁场作用下易与水分离。将羧酸改性SPION中和为钠盐后,研究了其作为正渗透驱动液的驱动效果。以商业反渗透膜为评价介质,当其质量分数为8.1%时,通量为2.0 L/（m2.h）。

英文摘要：

Silane coupling agent with a carboxylic acid end functional group was prepared by amidation of maleic anhydride with aminopropyltriethoxysilane. Superparamagnetic iron oxide nanoparticles （SPIONs） were prepared by chemical co-precipitation method and coated with carboxylic acid on the nanoparticle surface. The modified SPIONs were analyzed by the scanning electron microscope （SEM） , Fourier trans- form infrared spectroscope （FF-IR）, vibrating sample magnetometer （VSM）, and thermo gravimetric ana- lyzer （TGA）. The SPIONs showed the saturation magnetization was 44.4 emu/g and it was easily recov- ered by the application of an external magnetic field. The nanoparticles were used as draw agent in a for- ward osmosis process after turning into the sodium form with a water flux of 2.0 L/（ m2 h） at the draw solution concentration of 8.1% using a commercial RO membrane.