Wei Xiuzhen, Chen Zelong, He Mengjia, Xu Liangliang, Li Yue, Yang Jia, Zhang Xuekang, Zhang Xianghao, Wang Ze, Cao Shiyu, Zhou Qinghua, Pan Bingjun
College of Environment, Zhejiang University of Technology Hangzhou 310014 China
Abbey College Cambridge Cambridge Cambridgeshire UK.
RSC Adv. 2024 Jul 31;14(33):24055-24065. doi: 10.1039/d4ra03366c. eCollection 2024 Jul 26.
Mg-Fe layered hydroxide (LDH) was synthesized by the double titration method and added to trimesoyl chloride (TMC) to prepare an Mg-Fe LDH-modified polyamide nanofiltration (NF) membrane by interfacial polymerization (IP). Compared to the pure polyamide NF membrane, the Mg-Fe LDH-modified membrane presented a wrinkled structure and a comparatively smooth surface. Additionally, the permeation flux and rejection rate of the modified NF membrane for 1000 mg L NaSO solution were 61.7 L m h and 95.9%, respectively. When the Mg-Fe LDH modified NF membrane was used to separate dye/NaCl mixed solutions, the rejection of NaCl was less than 17% and the rejection rate of Coomassie Brilliant Blue (CBB) molecules was close to 100%. At the same time, the concentration of CBB increased from 500 mg L to 1151 mg L which means that the LDH modified NF membrane could separate CBB/NaCl effectively and could concentrate CBB at the same time.
采用双滴定法合成了镁铁层状氢氧化物（LDH），并将其添加到均苯三甲酰氯（TMC）中，通过界面聚合（IP）制备了镁铁LDH改性的聚酰胺纳滤（NF）膜。与纯聚酰胺NF膜相比，镁铁LDH改性膜呈现出褶皱结构和相对光滑的表面。此外，改性NF膜对1000 mg/L NaSO溶液的渗透通量和截留率分别为61.7 L·m⁻²·h⁻¹和95.9%。当使用镁铁LDH改性NF膜分离染料/NaCl混合溶液时，NaCl的截留率小于17%，考马斯亮蓝（CBB）分子的截留率接近100%。同时，CBB的浓度从500 mg/L增加到1151 mg/L，这意味着LDH改性NF膜能够有效分离CBB/NaCl并同时浓缩CBB。
