Adsorption of tetracycline on montmorillonite: influence of solution pH, temperature, and ionic strength

Po Hsiang Chang, Zhaohui Li, Wei Teh Jiang, Chung Yih Kuo, Jiin Shuh Jean

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The adsorption of tetracycline (TC) from aqueous solution by different types of montmorillonite (MMT) was studied under varying pH, temperature, and ionic strength conditions. The adsorption data obeyed the Langmuir isotherm with maximum TC adsorption at 468, 404, and 243 mg/g on SAz-1, SWy-2, and SYn-1 at pH 1.5, and at 375 mg/g on SHCa-1 at pH 8.7, corresponding to 0.86, 1.07, 0.78, and 1.28 of their cation exchange capacities, respectively. The kinetics of TC adsorption was very fast and reached equilibrium in almost 2 h and the results followed the pseudo-second-order kinetic model. In general, lower solution pH facilitated TC adsorption except for SHCa-1. Ionic strength had minimal influences on TC adsorption. The adsorption of TC on MMTs was endothermic, suggesting a strong physical adsorption. Under a weak alkaline condition, the TC adsorption resulted in extensive MMT delamination or exfoliation. Because of its high TC adsorption capacity, the results suggested that MMT could be a very good candidate to remove TC from wastewater containing high amounts of TC.

Original languageEnglish
Pages (from-to)1380-1392
Number of pages13
JournalDesalination and Water Treatment
Volume55
Issue number5
DOIs
Publication statusPublished - 2015 Jul 31

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Pollution

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