Optimizing the surface properties of nanofiltration membrane by tailoring the diffusion coefficient of amine monomer was written by Wei, Xiuzhen;Xu, Xufeng;Huang, Jiahao;Wang, Ze;Li, Huan;Shao, Fangyuan;Guo, Zhongquan;Zhou, Qinghua;Chen, Jinyuan;Pan, Bingjun. And the article was included in Journal of Membrane Science in 2022.COA of Formula: C9H3Cl3O3 This article mentions the following:
High-performance hollow fiber NF membranes with network structure were successfully prepared by introducing macromol. polyvinyl alc. (PVA) into aqueous phase to change the diffusion coefficient of amine monomer (piperazine, PIP) in organic phase. Based on Wilke-Change equation, a theor. model (DAO) dealing with viscosity of aqueous phase, mol. weight of PVA, and diffusion coefficient of amine monomer in organic phase was proposed. The applicability of the DAO model was verified by UV spectrophotometry (UV) monitoring and one-dimensional diffusion model. Subsequently, the structure of NF membranes was analyzed by SEM and XPS. The results suggested that the diffusion coefficient of amine monomer was neg. correlated with aqueous phase’s viscosity and polymer’s mol. weight With PVA205 (Mol. weight is 205000 Da) used to change the viscosity of aqueous phase, the diffusion coefficient of PIP (in n-hexane) was close to 2.70 × 10-6 cm2/s, and the resultant NF membrane (NF-PVA205-1) showed excellent performance; specifically, NF-PVA205-1 achieved a flux as 107 L/m2·h (4 bar), which is 3.5-times higher than that of pure polyamide NF membrane, and the rejection rate for sodium sulfate can reach 97.9%. Such a facile fabrication method proposed in this study can balance the “trade-off” effect of traditional NF membrane. In the experiment, the researchers used many compounds, for example, Trimesoylchloride (cas: 4422-95-1COA of Formula: C9H3Cl3O3).
Trimesoylchloride (cas: 4422-95-1) belongs to organic chlorides. Chlorination modifies the physical properties of hydrocarbons in several ways. These compounds are typically denser than water due to the higher atomic weight of chlorine versus hydrogen. Alkyl chlorides readily react with amines to give substituted amines. Alkyl chlorides are substituted by softer halides such as the iodide in the Finkelstein reaction.COA of Formula: C9H3Cl3O3
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics