A new approach combining sorption and an advanced oxidation process has been developed for wastewater treatment. Fe3+is incorporated into a cationic resin with or without the oxalate to afford two types of catalyst: ferrioxalate-exchanged resin (FOR) and ferric-exchange resin (FR), respectively. The removal of herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) by different resin-mediated processes including sole FOR, FOR/H2O2, UV/FOR, UV/R/H2O2, UV/FR/H2O2, UV/FOR/H2O2was investigated and compared. The optimal result was obtained in the treatment of 2,4-D with FOR when the system was irradiated at 350 nm with 1 mM H2O2; 80% of the 2,4-D disappeared after an operation time of 60 min. In addition, two other organic pollutants, atrazine (ATZ) and 2-chloroaniline (2-ClA), were used as the starting materials to test the selectivity of the solid catalyst. The FOR was found to be a non-selective catalyst; pre-sorption on the surface of the resin was not an essential step for the photocatalysis. Sorption and radical oxidation were found to be the major reaction pathways for the removal of 2,4-D. The recycling of the FOR was easy and feasible.
- Ion exchange
ASJC Scopus subject areas
- Process Chemistry and Technology
- Materials Science (miscellaneous)