摘要
为改善纳滤膜的性能,利用纤维素纳米晶(CNC)修饰氧化石墨烯(GO),合成了具有良好分散性的GO/CNC复合纳米材料,之后通过界面聚合引入聚酰胺(PA)层中制得改性纳滤膜,并进行形貌结构表征和性能测试。研究发现,GO/CNC改性膜表面具有更明显的凸起褶皱结构、更高的粗糙度及亲水性,在0.6 MPa下纯水通量可达38.45 L(/m2·h),较PA原膜与GO改性膜分别提升了84.86%和53.92%,Na2SO4和NaCl截留率分别为95.47%和6.65%。经pH=4、4000 mg/L的NaClO溶液浸泡4 h后,PA原膜的归一化纯水通量增加了近50%,归一化Na2SO4截留率降至0.89,而GO/CNC改性膜的归一化纯水通量仅增加了13%,Na2SO4截留率几乎无影响。上述结果表明,GO/CNC的添加可显著提升复合纳滤膜的渗透通量,同时具有良好的Na2SO4/NaCl分离选择性与耐氯性能。
This paper synthesized GO/CNC nanocomposite with good dispersion by modifying graphene oxide(GO)with cellulose nanocrystals(CNC),introduced the GO/CNC nanocomposite into the polyamide(PA)layer via interfacial polymerization to prepare modified nanofiltration membranes,and characterized the morphology and structure and tested the characteristics of the modified membrane,so as to improve the performance of the nanofiltration membranes.The surface of GO/CNC modified membrane had a more obvious convex fold structure,higher roughness and hydrophilicity.Its pure water flux reached 38.45 L/(m2·h)at 0.6 MPa,which was 84.86%and 53.92%higher than that of PA membrane and GO modified membrane,respectively.Its rejection rates of Na2SO4 and NaCl were 95.47%and 6.65%,respectively.After soaking in NaClO solution with concentration of 4000 mg/L(pH=4)for 4 h,the normalized pure water flux of the PA membrane increased by nearly 50%,accompanied with a decrease of the normalized Na2SO4 rejection from 1.00 to 0.89.In contrast,the normalized pure water flux of the GO/CNC modified membrane only increased by 13%,and the Na2SO4 rejection was almost unaffected.The addition of GO/CNC significantly enhanced the permeate flux of the composite nanofiltration membrane,and exhibited good Na2SO4/NaCl separation selectivity and chlorine resistance.
作者
吕永涛
杨雅馨
吝力
潘永宝
崔双科
王磊
LÜYong‑tao;YANG Ya‑xin;LIN Li;PAN Yong‑bao;CUI Shuang‑ke;WANG Lei(School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Membrane Separation of Shaanxi Province,Research Institute of Membrane Separation Technology of Shaanxi Province,Xi’an 710055,China;Shaanxi Modern Architecture Design&Research Institute Co.Ltd.,Xi’an 710021,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2024年第11期65-72,共8页
China Water & Wastewater
基金
国家重点研发计划项目(2022YFC2904303)
陕西省重点产业链项目(2022ZDLSF06-05)
陕西省重点研发计划项目(2023-YBSF-596)。
关键词
氧化石墨烯
纤维素纳米晶
纳滤膜
界面聚合
耐氯性
graphene oxide
cellulose nanocrystal
nanofiltration membrane
interface polymerization
chlorine resistance
