Work

Ionic Liquid‐Modified Resorcinol Formaldehyde Resins: Synthesis and Applications to Methylene Blue Removal

Year: 2025

Type: article

Abstract: Two new imidazolium‐functionalized resorcinol‐formaldehyde resins RFs were synthesized, using butyl‐methyl imidazolium resorcinate [C 1 C 4 Im][Res] as a new precursor or using a post‐functionalization method. During its synthesis, [C 1 C 4 Im][Res] spontenaously co‐crystallizes with resorcinol (in a 1: 1 stoichiometry): the crystal structure shows H‐bonds between resorcinol and resorcinate, and rarely observed π + –π − and C–H – π interactions between the imidazolium ring and resorcinate. New RFs presented substantial decreases of the band gap compared to unmodified RF (2.0–1.72 eV). The use of [C 1 C 4 Im][Res] significantly improves particle size uniformity compared to unmodified RF, whereas the post‐functionalization method partially degrades their structure. As RF, the two new resins efficiently catalyze the photodegradation of the methylene blue cation, and the post‐functionalized resin has excellent adsorption properties for this dye.

Source: Chemistry - A European Journal

DOI: 10.1002/chem.202500329

Authors: Martin Tiano, Sara Asad, Ning Zhang, Elsa Manseur, Selene Charlemont, Stéphane Daniele