Yujiao Li,Xuemeng Hu,Zihan Wu,Shaoyuan Shi,Yingxue Sun
Based on similar chemical structures and reactive sites with dopamine, polyphenols and some amines can react and generate adhesive polymers through oxidation and Michael addition/Schiff base reactions. In this study, four kinds of polyphenol-amine codeposition solutions were applied in surface modification of anion exchange membranes used in electrodialysis (ED). Catechol (CA)/tannic acid (TA) and m-phenylenediamine (MPD)/polyethylenimine (PEI) were respectively selected as polyphenol monomer and amine monomer, with chemical structural differences in the length of the carbon chain, the number of benzene rings, and functional groups. The effects of monomer type on copolymerization and codeposition process were investigated. Results showed that polyphenol types had important influences on chemical reactions and deposition. The codeposition solutions containing CA, especially the CA-MPD solution with two small molecular monomers, exhibited active and fast reaction rates, reflected in the changes in solution color and UV–visible absorption. By contrast, the flocculent between macromolecular monomers of TA and PEI changed the presence of solution, intermediates, and polymeric products, promoting deposition rates. In ED experiments, all modified AEMs maintained the desalination efficiency and demonstrated a better antifouling ability. However, the modified AEMs could not totally resist foulants and protect from the negative effects of fouling; regulating and improving codeposition modification need more investigation.
Long Chen,Yankun Guo,Peiyu Cui,Zexin Lin,Junlong Yao,Syed Ali Raza Naqvi,Yimin Sun,Yani Guo
s Polyphenol-amine exhibits strong adhesive properties, attributed to its structural similarity to dopamine. In this study, Polyphenol-amine formed from low-cost catechol and diethyltriamine (DETA) as monomers, was blended with hydrophobic agents, including n-dodecyl mercaptan, stearic acid, and ferric oxide, to form soaking agents. Using a facile and environmentally friendly dip-coating method with commercial melamine sponges (MS) as templates, two types of sponges were fabricated: a hydrophobic superoleophilic sponge (PCAD/MS) and a magnetic superhydrophobic superoleophilic sponge (SA/Fe 3 O 4 @PCA/MS). Both modified sponges exhibit exceptional oil absorption capacities, ranging from 74 to 152 g/g and 63–118 g/g for various oils and organic solvents, high oil–water separation efficiency (＞99.1 % and ＞99.5 %), respectively. Additionally, they demonstrate excellent resistance to acidic, alkaline, and saline conditions, remarkable recyclability, and effective demulsification performance. Notably, the magnetic SA/Fe 3 O 4 @PCA/MS could be remotely actuated for continuous oil-water separation, enhancing its potential for large-scale oil spill cleanup and industrial wastewater treatment. Compared with conventional polydopamine- or fluorine-based coatings, this method provides a greener, more economical, and scalable solution for the fabrication of high-performance oil-absorbent materials.
危险品化学品经营许可证（带存储）