Preparation of Modified Zeolites by β-cyclodextrin and Its Sorption Performance of p-nitrophenol

Abstract

The surface of zeolite was modified by β-cyclodextrin (β-CD) using epichlorohydrin (EPI) as linker to prepare a novel and effective sorbent for removal of p-nitrophenol (p-NP) from aqueous solution. FTIR was used to characterize the surface modification. It was found that the different preparation conditions such as methods of pretreatment, the mole ratio of EPI to β-CD (MEPI:Mβ-CD), pH and NaOH (%) made an impact on sorption capacity of p-NP on β-CD-modified zeolite (ECDMZ). Given MEPI:Mβ-CD 3:1, pH 4.07 and NaOH 6% might be optimum for β-CD to fix on zeolite surfaces. The sorption of p-NP on ECDMZ, cationic β-cyclodextrin (CCD) modified zeolite (CCDMZ) and natural zeolite (NZ) was compared by initial p-NP concentration with the batch sorption experiments. The results showed that the sorption of p-NP on ECDMZ was higher than that of CCDMZ and NZ. Introduction