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论文类型：期刊论文

发表时间：2010-02-01

发表刊物：12th Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE 2008)

收录刊物：SCIE、EI、CPCI-S、Scopus

卷号：156

期号：3

页面范围：540-545

ISSN号：1385-8947

关键字：Ca-Selectivity zeolite; Calcium; Adsorption; pH effects; Model

摘要：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.