Abstract: The removal of Cd2+ ions through ultrafiltration from aqueous solution using anionic surfactant SDBS added with nano SiO2 was studied. Effects of nano SiO2 addition and pH on the ultrafiltration process were investigated. The permeation flux was increased by 25% through the addition of nano SiO2, the removal of Cd2+ was also increased in some extent, while the permeated SDBS concentration became lowered. The permeation flux and the rejection of SDBS and Cd2+ are affected by the pH of the solution, which would become lowered when increasing the nano SiO2 addition. In addition, the membrane fouling was mainly due to the the membrane surface adsorption resistance and the membrane pore blocking resistance.

摘要： 以纳米SiO2同阴离子表面活性剂十二烷基苯磺酸钠（SDBS）复合的胶束强化超滤处理含镉废水。考察了粉体加入、pH值、粉体浓度对超滤的影响。结果表明，纳米SiO2加入后，膜通量提高了25%，Cd2+截留率有所提高，渗透液中SDBS的浓度在一定条件下有所降低。膜通量、SDBS及Cd2+的截留率随pH值的变化而变化，三者随纳米SiO2加入量的增大而降低。另外，膜阻力主要为膜面吸附和膜孔堵塞阻力。