摘要
文中旨在介绍一种可产业化的中空纤维膜表面功能化方法。通过连续化紫外光辐照接枝法,将亲水性单体丙烯酸(AA)接枝到膜表面,形成亲水接枝层。膜的亲水性受接枝密度的影响,可方便地通过调整卷绕速度、单体浓度和光敏剂浓度等工艺参数来获得合适的接枝密度。随着接枝密度的增大,膜的水接触角降低,纯水通量显著增大,表明亲水性得到了提高。抗污染性实验结果显示,随着接枝密度从0增大到3.54 mmol/m2,膜的总污染系数从0.647下降到0.377,不可逆污染系数从0.5减小到0.097,纯水通量恢复率从49.98%增加到90.30%,部分不可逆污染可转变为可逆污染,从而通过水力反清洗的方法除去,表明经过连续紫外辐照接枝亲水改性后,膜的抗污染性得到了显著的提高。
This study aimed to introduce a method for manufacturing functional membranes which can be easily industrialized. A continuous UV photografting system was developed to modify the hydrophilic membrane. The internal structure of UV reactor was designed emphatically. It is found that the hydrophilicity of membranes is influenced by graft density （GD）, and the desired GD can be achieved by adjusting the grafting conditions, such as line rate, acrylic acid （AA） concentration and benzophenone （BP） concentration. The pure water flux significantly increases with the increase of GD, while the water contact angle decreases, which indicates that the hydrophilicity of membranes is improved. Fouling test reveals that the total fouling （Rt） is decreased from 0.647 to 0.377 with the increase of grafting density from 0 to 3.54 mmol/m2, and correspondingly the irreversible fouling （Rir） is dropped from 0.5 to 0.097 dramatically, while the flux recovery ratio is increased from 49.98% to 90.30%. Most of irreversible fouling is converted to reversible fouling （Rr）, which could be removed by hydraulic cleaning. Results show that the antifouling performance of membranes is enhanced significantly after continuous UV photografting polymerization.
作者
郭艳芬
廖小深
魏俊富
迟春亮
赵孔银
王晓磊
Yanfen Guo1,3, Xiaoshen Liao2, Junfu Wei1,2, Chunliang Chi2, Kongyin Zhao3, Xiaolei Wang2(1. State Key Laboratory of Hollow Fiber Membrane Materials and Processes, Tianjin Polytechnic University ; 2. School of Environmental and Chemical Engineering, Tianjin Polytechnic University; 3. School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, China)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2018年第3期116-121,共6页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(41301542,51678409)
天津市科技支撑计划(15ZCZDSF00880)
关键词
连续化紫外接枝
中空纤维膜
亲水性
抗污染性
continuous UV photografting
hollow fiber membrane
hydrophilicity
antifouling
