Greatly improved adsorption of N‐methylated modified macroporous cross‐linked polyacrylamide toward tannin from aqueous solution

Abstract

Macroporous cross-linked poly(N-methylacrylamide) (PMAM) was prepared and the adsorption behaviors of PMAM toward tannin from aqueous solution was studied in comparison with polyacrylamide (PAM). The swollen property indicated that PMAM had a higher hydrophobicity than PAM while the adsorption showed that PMAM had a greatly improved adsorption toward tannin. The adsorption data could be fitted well by Freundlich model and the values of the thermodynamic parameters of PMAM toward tannin were more negative than PAM. The multiple hydrogen bonding and hydrophobic interaction between PAM/PMAM and tannin were shown to be responsible for the adsorption, whereas a stronger hydrogen bonding and a higher hydrophobicity of PMAM had a contribution to the greatly improved adsorption of PMAM toward tannin.

Natural polyphenol tannin-immobilized composites: rational design and versatile applications

“…Another work indicated that the hydrophobic interaction and multiple hydrogen bonding between poly( N -methyl acrylamide) (PMAM)/polyacrylamide (PAM) and tannin were responsible for stabilizing these composites. 186 Due to the hydrogen bonding and good hydrophobicity of PMAM, it was easier to form a PMAM–tannin composite rather than PAM–tannin.…”

“…185 3.2.6 Other synthetic polymers. Moreover, other synthetic polymers, such as polyamide (PAM), 17,186 polyethylene glycol (PEG), [187][188][189] polyacrylonitriles (PAN), 190 and polypyrroles (Ppy), 191 were also used as substrates for the immobilization of tannins and their derivatives.…”