摘要
纳滤分离技术是一种具有绿色高效节能的膜分离技术。虽然具有较高的分离精度,但由于随之带来的较低通量,纳滤技术的进一步推广受到了限制。为了提高纳滤膜的通量水平,本文通过优化界面聚合反应条件,对膜的结构进行调整,并探讨了亲水材料对膜性能的影响。通过将4-(2-羟乙基)吗啉作为亲水剂引入水油反应体系,从而对界面聚合反应的条件进行控制,实现对纳滤膜分离功能层结构的干预。结果表面,当亲水添加剂的掺量比从0%增加至5%时,纳滤膜的通量表现出了较大提高,同时纳滤膜的对不同价态无机盐的选择性分离特点并未受到较大影响,仍保持对氯化物的优先透过。通过寻找亲水剂的最佳参比、最优反应时间相关实验,发现当4-(2-羟乙基)吗啉的掺量为质量比为2.5%、水相处理基膜时间为3分钟、热处理制度为80℃下进行3分钟时,所得到的纳滤膜的对Mg SO4溶液的截留率为82.7%,同时水通量为24 L/m-2h-1。
Nanofiltration technology exhibits application potential in many promising field, however, the poor water permeance has limited its further promoting. Here, 4-(2-hydroxyethyl) morpholine were selected as hydrophilic additives, and the effect of the 4-(2-hydroxyethyl) morpholine and the reaction conditions on the ultra-thin poly skin layer structure and performance of the nanofiltration membrane were investigated. As the 4-(2-hydroxyethyl) morpholine concentration in the aqueous phase solution increased from 0 wt % to 5 wt%, the water flux increased dramatically, as well as the rejection decreased, while the changes to the selecting sequence for salt of nanofiltration membrane was not obvious. When the concentration of 4-(2-hydroxyethyl) morpholine is 2.5 wt%, the treating time for substrate membrane is 3 min, the heat-treatment temperature is 80 ℃ and the time is 30 s, the membrane exhibited the optimum separation performance.
作者
郭利妍
李永进
朱德馨
徐庚举
王磊
Guo Liyan;Li Yongjin;Zhu Dexin;Xu Gengju;Wang Lei(Jin Jian Engineering Desing Co.,Ltd.,Yantai 264670;Yantai Jin Jian Metallurgy Technology Co.,Ltd.,Yantai 264670;Xi’an University of Architecture and Technology,Xi’an 710055,China)
出处
《广东化工》
CAS
2020年第24期1-3,共3页
Guangdong Chemical Industry
关键词
纳滤技术
界面聚合反应
亲水添加剂
膜通量
nanofiltrtion
Interfacial polymerization
Hydrophilic additive
membrane flux
