高性能聚苯乙烯磺酸钠纳滤膜的制备及I^(-)分离性能  

Preparation of high performances polystyrene sulfonate sodiumnan ofiltration membrane and its application for I^(-)removal

作　　者：罗巧裕 邓慧宇[1] 王诗平 聂亮 陈庆春[1] LUO Qiaoyu;DENG Huiyu;WANG Shiping;NIE Liang;CHEN Qingchun(State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013,China)

机构地区：[1]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《功能材料》2024年第11期11115-11124,11146,共11页Journal of Functional Materials

基　　金：国家自然科学基金项目(52163027)。

摘　　要：水中存在的放射性碘离子或过量碘离子会极大危害自然环境,影响人类健康。本实验以聚砜超滤膜为基膜,采用原位紫外接枝法制备了聚苯乙烯磺酸钠纳滤膜,用于水中碘离子的脱除。通过改变接枝单体浓度、溶液用量、辐照时间和辐照距离等条件调节膜性能。结果表明,当基膜表面加入40 mL 0.5 mol/L苯乙烯磺酸钠(SS)溶液,用300 W紫外灯于4 cm高度辐照15 min后,制备的NF-4 cm膜在0.6 Mpa对100 mg/L I^(-)截留率达到92.6%,通量为47.7 L/m^(2) h。辐照距离增加到10 cm后,制备的NF-10 cm膜由于孔径增大,分离层变薄导致通量明显增加,达到112.9 L/m^(2) h,由于此时表面有效负电荷增多,所以截留率仅下降至82.9%。需要指出,增大操作压力,NF-4 cm膜通量增大,对I^(-)的截留率基本稳定在90%以上,对Cl^(-)的抗干扰能力较强,预示了该膜在含碘废水处理中具有良好的应用潜能。The presence of radioactive I^(-)or excessive I^(-)in water will greatly harm the natural environment and affect human health.In this experiment,polystyrene sulfonate sodium(PSS)nanofiltration membranes were prepared by in-situ UV grafting of styrene sulfonate sodium on polysulfone ultrafiltration membrane for the removal of I^(-)from aqueous solution.The performances of the membrane were regulated by changing the monomer concentration,the amount of monomer solution,the irradiation time and the irradiation distance.When 40 mL 0.5mol/L sodium styrene sulfonate(SS)solution was added onto the surface of the substrate membrane and irradiated by 300 w UV light at 4 cm for 15 min,the removal rate for 100 mg/L I^(-)of the prepared NF-4 cm membrane reached 92.6%at 0.6 Mpa,and the flux was 47.7 L/m^(2) h.Further increasing the distance to 10 cm,the flux of the prepared NF-10 cm membrane increased significantly,reached 112.9 L/m^(2) h because of the larger pore size and the thinner separation layer.Due to the higher effective negative surface charge,the removal rate only decreased to 82.9%.For NF-4 cm membrane,it should be noted that the I^(-)removing rate remained stable more than 90%and the flux increased by increasing the operation pressure.The anti-interference ability to Cl^(-)of NF-4 cm membrane is strong which indicated that the membrane had well application potential in the treatment of I^(-)-containing wastewater.

关 键 词：紫外接枝 聚苯乙烯磺酸钠 纳滤膜 分离I^(-) 

分 类 号：TQ028.8[化学工程] TB317.9[一般工业技术—材料科学与工程]