Release Time:2019-03-11  Hits:

Indexed by: Journal Article

Date of Publication: 2010-02-01

Journal: 12th Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE 2008)

Included Journals: Scopus、CPCI-S、EI、SCIE

Volume: 156

Issue: 3

Page Number: 540-545

ISSN: 1385-8947

Key Words: Ca-Selectivity zeolite; Calcium; Adsorption; pH effects; Model

Abstract: Ca-Selectivity zeolite was synthesized and the structure morphology, the physical and chemical performances were characterized by SEM, XRD and FT-IR. It was used as adsorbents of calcium in batch system for this study. The Ca(2+) adsorption performances in the fixed-pH 9.18 and in pH ranges from 2 to 12.5 were tested. The Langmuir and Freundlich isotherms were adopted to evaluate the experimental data in fixed-pH and the competitive adsorption models were fitted to data in the condition which the pH values are without any control during adsorption process, respectively. The results noted that the Ca-Selectivity zeolite presented good adsorption capacity with about 105 mg/g and electrostatic adsorption, ion-exchange and hydroxyl complex are major mechanism of calcium adsorption. It indicated that the Ca-Selectivity zeolite has potential application value in zero discharge of seawater desalination. (C) 2009 Elsevier B.V. All rights reserved.