CIESC Journal ›› 2022, Vol. 73 ›› Issue (2): 941-950.DOI: 10.11949/0438-1157.20210869

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Construction heterostructure g-C3N4@AM lamellar membrane and its performance of organic solvent nanofiltation

Guoli ZHOU(),Xiangke HAN,Wenjia WU,Jingtao WANG(),Maowa ZHANG,Fengli LI   

  1. School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, Henan, China
  • Received:2021-08-28 Revised:2021-10-29 Online:2022-02-18 Published:2022-02-05
  • Contact: Jingtao WANG

异质结构g-C3N4@AM层状膜构筑及纳滤性能研究

周国莉(),韩项珂,武文佳,王景涛(),张毛娃,李凤丽   

  1. 郑州大学化工学院,河南 郑州 450001
  • 通讯作者: 王景涛
  • 作者简介:周国莉(1984—),女,博士,副教授,zglcumt@126.com
  • 基金资助:
    国家自然科学基金项目(51904274);中国博士后科学基金项目(2021T140615)

Abstract:

With the rapid development of industry, increasing attention has been paid to the efficient separation of organic solvents by nanofiltration membranes. However, nanofiltration membranes are difficult to be further industrialized because of the trade-off effect between flux and selectivity. In this paper, hydrophobic g-C3N4 nanosheets and hydrophilic amylose (AM) were used as building units to prepare heterostructure g-C3N4@AM lamellar membrane by double needle electrostatic atomization. The hydrophilic amylose promotes the dissolution of polar solvents and the hydrophobic g-C3N4 nanosheets provide the low resistance diffusion of polar solvents. Therefore, this heterostructure structure greatly enhances the permeation of the membrane to polar solvents without reducing the separation ability. Compared with g-C3N4 membrane, the g-C3N4@AM membranes show 1—2 times higher polar solvent permeance. Simultaneously, the g-C3N4@AM membranes accomplish 99% rejections towards dye molecules with sizes above 1.5 nm. After long-term operation, pressure cycle and acid-base stability test, the variation of solvent permeance and dye rejection is below 6%, which demonstrate that this hydrophilic/hydrophobic heterostructured lamellar membrane shows great operating stability.

Key words: heterostructure, electrostatic atomization, amylose, membrane, nanofiltration, separation

摘要:

随着化工行业的迅速发展,利用纳滤膜对有机溶剂进行高效分离受到了越来越多的关注,但有机溶剂纳滤膜通量和选择性之间普遍存在 trade-off 效应的限制。以相对疏水的g-C3N4纳米片和亲水的直链淀粉(amylose,AM)为构筑单元,利用双针头静电雾化技术制备了异质结构的g-C3N4@AM 层状膜。亲水的直链淀粉促进了极性溶剂的溶解,相对疏水的g-C3N4纳米片实现了通道对极性溶剂的低阻力扩散;两者协同,极大地增强了膜对极性溶剂的渗透性能,而不降低分离能力。与纯g-C3N4层状膜相比,g-C3N4@AM 层状膜对极性溶剂的渗透系数提高了1~2倍,对于尺寸大于 1.5 nm 的染料分子可以实现 99% 以上的截留率。在操作稳定性、压力循环和耐酸碱测试后,膜的渗透性能和截留能力基本保持不变,衰减 < 6%,具有较好的操作稳定性。

关键词: 异质结构, 静电雾化, 直链淀粉, 膜, 纳滤, 分离

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