Studies of Modification of Zeolite by Tandem Acid-Base Treatments and its Adsorptions Performance Towards Thorium

Abstract

Hierarchical zeolite wa s prepared from natural zeolite using tandem acid-base treatments and applied as adsorbent for Th(IV) removal . Natural zeolite occurred natur ally as microporous material. It was modified using two familiar method s simultaneously, dealumination and desilication techniques, to change its micropore size into hierarchical pores. . Extensive characterization of both natural and modified zeolite s were conducted using XRD, BET, SEM-EDS, and AAS. XRD Pattern s of r aw, p re-treated , and acid-base tandem modified zeolites show that the modification process has not change d the crystal properties of this material. However, the Si/Al ratio is increased from 6.688 to 11.401 for Na-zeolite (NaZ) and modified zeolite, ZA2B respectively. The s urface area is increase d from 125.4 m 2 /g (NaZ) to 216.8 m 2 /g (ZA2B), indicative of the creation of mesopore in addition to naturally micropore structure . The application of these zeolite material s as adsorbent were carried out using solution of 50 ppm Th 4 + measured using UV-Vis spectrophotometer . The UV-Vis result shows that the modified zeolite (ca. 10 mg) has higher adsorption capacity than natural zeolite. The adsorption process does not fit into Langmuir and Freundlich isotherm and the adsorption capacity of this material increase from 909 mg/g to 2000 mg/g for NaZ and ZA2B respectively. Received: 26 January 2015; Revised: 20 May 2015: Accepted 21 May 2015