摘要
以聚醚砜(PES)为膜的基质材料,以粉末状阴离子交换树脂(201×7)为功能颗粒,采用相转化的方法制备了阴离子交换树脂/聚醚砜复合膜。用扫描电子显微镜(SEM)对膜形貌进行表征,采用电子拉伸试验机测定了复合膜的力学性能,采用傅里叶红外光谱(FTIR)对膜吸附机理进行了研究。SEM结果表明,树脂颗粒在聚合物膜中均匀镶嵌分布,树脂的添加提高了膜的孔隙率,且树脂含量越大孔径越大,复合膜的机械拉伸强度随树脂含量的增加而略有降低。选用树脂含量为60%(w/w)的复合膜进行吸附性能研究,结果表明,吸附可在120min内达到平衡,该吸附膜在pH值为3~9范围内对碘离子有很好的吸附去除效果;吸附量随初始浓度增加而增加,吸附符合Freundlich模型,无饱和吸附量,说明多层吸附在吸附过程中发挥重要作用。共存阴离子如硫酸根、氯离子、硝酸根离子的存在会降低碘离子吸附量。FTIR结果表明,复合膜对碘离子的吸附主要是物理吸附。吸附碘离子的复合膜可以脱附再生,且多次再生后,吸附量未见降低。
PES/resin blend flat sheet membranes were prepared by phase inversion process.The powder anion exchange resin(201×7)was used as the functional material and the polyethersulfone(PES)was used as matrix material.The membranes’morphology was characterized by scanning electron microscopy(SEM).The tensile strength of the membranes was tested by electronic tensile testing machine.The adsorption mechanism of membranes was studied by FTIR.The results of SEM indicated that,the addition of resin caused an increase in surface porosity of the PES/resin composite membrane and the resin was homogeneous mixing in the membranes.The tensile strength of the composite membranes decreased slightly with the increase of resin content.The iodide adsorption capacity of the membranes(the resin content ratio was 60%weight by weight)was evaluated.The contact adsorption experiment showed that the equilibrium of the adsorption could be reached within 120 min.The batch adsorption studies demonstrated that the membrane adsorbents could be applied for efficient adsorption removal of iodide ion in an extensive pH range from 3 to 9.Adsorption results showed that the adsorption amount increased with the increasing of initial concentration for iodide ion,and the Freundlich model was more suited the multilayer adsorption.It indicated that the multilayer adsorption played an important role in the adsorption process.The presence of other anions such as sulfate ion chloridion and nitrate ion could decrease the adsorption amount of iodide ion.In addition,Fourier transform infrared spectroscopy showed that the adsorption of the composite membranes was physical adsorption.Finally,the iodide loaded composite membranes were regenerated and the removing efficiency of iodide didn’t reduce with the increase of regeneration times.
作者
于凤芹
王海增
YU Fengqin;WANG Haizeng(Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education,College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第18期3276-3280,共5页
Materials Reports
基金
山东省自主创新重大专项计划(931248050)。
关键词
树脂
复合膜
碘离子
吸附
resin
composite membrane
iodide ion
adsorbent
