Synthesis of novel hypercrosslinked resin and their absorption towards salicylic acid and gallic acid

In this paper, hypercrosslinked resin XC-01 was synthesized by Friedel-Crafts reaction and characterized by elemental analysis (EA), Fourier-transformed infrared spectroscopy (FTIR), N2 adsorption-desorption analysis and scanning electron microscopy (SEM).XC-01 displayed much better adsorption performance than amberlite XAD-4 and its adsorption capacities towards salicylic acid and gallic acid were 4.96 and 7.23 times larger than those of XAD-4 respectively, which indicate good application prospect of XC-01. It was also found that low temperature and acidic environment were favorable for the adsorption and the resin reached equilibrium in a remarkably short time of 120 min. Compared to gallic acid, better adsorption capacity was achieved with salicylic acid as a result of low hydrophilicity and smaller molecular size of the adsorbate. Freundlich model could better simulate the adsorption process, suggesting physical interaction was the major adsorption mechanism.The research provides theoretical foundation for wastewater treatment and resource utilization.