Mechanism of chlorpheniramine adsorption on Ca-montmorillonite

Zhaohui Li, Po Hsiang Chang, Jiin Shuh Jean, Wei Teh Jiang, Hanlie Hong

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

An increased detection of common pharmaceuticals and personal care products in surface water and wastewater has rekindled the interests of studying their interactions with solid surfaces. In this research, adsorption of chlorpheniramine (CP), an antihistamine medicine commonly used to treat allergy, onto a swelling clay mineral montmorillonite (MMT) was investigated under kinetic and different solution conditions via batch adsorption, XRD, TG-DTG, and FTIR analyses in order to elucidate the mechanism of CP adsorption on MMT, an important environmental solid matrix, and explore potential use of MMT to remove CP from water. Stoichiometric desorption of exchangeable cations suggested cation exchange as the dominant mechanism of CP adsorption on MMT. The over-balanced desorption of exchangeable cations against the amount of CP adsorption may be attributed to protonation of the two N atoms, thus resulting in a divalent cation adsorption, or adsorption of an extra H+ generated from the second deprotonation of maleic acid. Both external and internal surfaces were responsible for CP adsorption on MMT, resulting in a large CP adsorption capacity of 0.72mmolg-1, or about 20% by weight. The fast CP adsorption, large CP adsorption capacity, and negligible pH effect make MMT a good sorbent to remove CP from wastewater on one hand and an important environmental sink on the other.

Original languageEnglish
Pages (from-to)213-218
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume385
Issue number1-3
DOIs
Publication statusPublished - 2011 Jul 20

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

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