二氮杂萘联苯聚芳醚砜酮超滤膜的制备与除砷性能研究

发布时间：2018-03-06 10:43

  本文选题：砷吸附效率　切入点：聚芳醚砜酮　出处：《北京林业大学》2015年硕士论文　论文类型：学位论文

【摘要】：最近几年,砷污染问题变得越来越严重,亟待有效的处理措施降低砷对人类生活健康的侵害。本论文将超滤技术和吸附法相结合,将吸附剂添加到超滤膜中制备出一种复合膜,使其具备以下优点,一则具备优异的膜性能,二则具备良好的除砷效能。本论文通过溶胶-凝胶相转化法制备了含有不同种类无机/有机添加剂的二氮杂萘联苯聚芳醚砜酮(PPESK)超滤膜,并研究了聚合物浓度、不同种类无机/有机添加剂对PPESK超滤膜性能的影响以及优化PPESK膜的除砷效能。通过实验确定优化PPESK膜配方为：14.0 wt.%PPESK,N-甲基吡咯烷酮(NMP)为溶剂,3.0 wt.%聚氧乙烯-聚氧丙烯-聚氧乙烯共聚物(PEO-PPO-PEO)作为第一添加剂,3.0 wt.%草酸作为第二添加剂,1.2 wt.%JR05型纳米二氧化钛为第三添加剂。实验结果显示,只有优化PPESK膜及纳米二氧化钛单体可以对砷进行去除；且在相同砷浓度水样中,优化PPESK膜对砷的吸附量高于纳米二氧化钛单体。对于优化PPESK膜应用性研究来说,1)当过滤时间由0分钟增加到20分钟时,,砷吸附效率由100%降低至73.7%；2)随着水样中含砷浓度由0增加到0.5 mg/L时,砷吸附效率由100%减小至8.3%；3)当温度变化范围为20-40℃时,砷吸附效率变化不大,基本保持在78.5%左右；4)当操作压力由0.05 MPa增加到0.25 MPa时,砷吸附效率由86.6%略微降低至70.8%；5)随着料液pH由3增加至5时,砷吸附效率基本稳定在85.0%左右,当pH进一步增加至11时,砷吸附效率减小至63.4%。
[Abstract]:In recent years, the problem of arsenic pollution has become more and more serious, and it is urgent to take effective measures to reduce the harm of arsenic to human health. In this paper, a composite membrane was prepared by adding adsorbent into ultrafiltration membrane by combining ultrafiltration technology with adsorption method. Make it have the following advantages, one has excellent film performance, In this paper, a novel ultrafiltration membrane containing different inorganic / organic additives was prepared by sol-gel phase inversion method, and the polymer concentration was studied. The effect of different inorganic / organic additives on the performance of PPESK ultrafiltration membrane and the arsenic removal efficiency of PPESK membrane were optimized. The optimized formula of PPESK membrane was determined as: 1: 14.0 wt.10% PPESKN- methylpyrrolidone as solvent 3. 0 wt.% polyoxyethylene-polyoxypropylene. -PEO-PPO-PEO) as the first additive, 3.0wt.% oxalic acid as the second additive and 1.2 wt.%JR05 nano-TiO _ 2 as the third additive. Arsenic can be removed only by optimizing the PPESK membrane and nano-TiO _ 2 monomer, and in the same arsenic concentration water sample, The arsenic adsorption capacity of optimized PPESK membrane is higher than that of nano-TiO _ 2 monomer. For the application study of optimized PPESK membrane, the arsenic adsorption efficiency decreases from 100% to 73.7% with the increase of filtration time from 0 minutes to 20 minutes. When the concentration increased from 0 to 0. 5 mg/L, The arsenic adsorption efficiency decreased from 100% to 8.3 鈩，

本文编号：1574508