Grafted Amberlite 200 C resin for adsorptive removal of salicylic acid

Abstract

Abstract Removal of salicylic acid (SA) present in the pharmaceutical aqueous waste was performed by unmodified and modified commercial cationic exchange resin (Amberlite 200C). Modification of commercial resin was carried out by grafting of functional molecules either into aromatic ring using classical organic reaction or by physical irreversible adsorption in the resin skeleton. Nitro group NO2+ was prepared by mixing nitric and sulfuric acids and fixed by nitration whereas 2,4-dinitrophenyl hydrazine (DNPH), tributyl phosphate (TBP), and NH4+ were adsorbed on the resin matrix by immersion. As a result, unmodified resin allow elimination 21% of initial salicylic acid. While the yield of salicylic acid elimination was found to be notably increased by using modified resins. Elimination of SA by NH4+ and DNPH modified resins reached respectively 51.94 and 41.5%. In the same purpose, it has been observed no consequently removal of SA when TBP and NO2+ modified resins were employed. It was noted that the optimal operational conditions were pH=5.5 T° = 21°C, t = 20 min