REMOVAL OF p-NITROPHENOL FROM AQUEOUS SOLUTIONS USING AMINOPROPYL SILICA GEL-IMMOBILIZED CALIX[4]ARENE POLYMER (C[4]APS)
Abstract
This study describes the preparation of a new polymeric calix[4]arene derivative and its application as a sorbent material in adsorption of p-nitro phenol (PNP). Thus after the preparing of the precursor calixarene derivatives (1-5), compound 5 was immobilized onto aminopropyl silica gel supporting material to obtain polymeric calix[4]arene (6). All compounds were characterized by using some methods such as FTIR, 1H NMR, elemental analysis, TGA and SEM. Aminopropyl silica gel-immobilized calix[4]arene (C[4]APS) 6 was used as a sorbent in the adsorption studies of PNP and it was examined some parameters such as pH, contact time, initial concentration, process temperature and sorbent dosage. The results showed that pH 6, contact time 1 hour, the concentration of 5.0x10-5 M PNP, 0.025 g of sorbent dosage and 25oC of temperature was found as optimum parameters of PNP adsorption by 6. Also Langmuir and Freundlich isotherms were evaluated to clarify the PNP adsorption mechanism.
Keywords
Aminopropyl silica gel (APS); Adsorption; p-Nitro phenol (PNP), Polymeric calix[4]arene.
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