Adsorption of tetracycline on Fe (Hydr)oxides: Effects of pH and metal cation (Cu2+, Zn2+ and Al3+) addition in various molar ratios

Liang Ching Hsu, Yu Ting Liu, Chien Hui Syu, Mei Hsia Huang, Yu Min Tzou, Heng Yi Teah

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Iron (Fe) (hydr)oxides control the mobility and bioavailability of tetracycline (TC) in waters and soils. Adsorption of TC on Fe (hydr)oxides is greatly affected by polyvalent metals; however, impacts of molar metal/TC ratios on TC adsorptive behaviours on Fe (hydr)oxides remain unclear. Results showed that maximum TC adsorption on ferrihydrite and goethite occurred at pH 5–6. Such TC adsorption was generally promoted by the addition of Cu2+, Zn2+ and Al3+. The greatest increase in TC adsorption was found in the system with molar Cu/TC ratio of 3 due to the formation of Fe hydr(oxide)– Cu–TC ternary complexes. Functional groups on TC that were responsible for the complexation with Cu2+ shifted from phenolic diketone groups at Cu/TC molar ratio < 1 to amide groups at Cu/TC molar ratio ≥ 1. For the addition of Al3+, the complexation only took place with phenolic diketone groups, resulting in the enhanced TC adsorption at a molar Al/TC ratio of 1. However, TC adsorption decreased for Al/TC molar ratio > 1 as excess Al3+ led to the competitive adsorption with Al/TC complexes. For the Zn2+ addition, no significant correlation was found between TC adsorption capacity and molar Zn/TC ratios.

Original languageEnglish
Article number171941
JournalRoyal Society Open Science
Volume5
Issue number3
DOIs
Publication statusPublished - 2018 Mar 28
Externally publishedYes

Keywords

  • Adsorption
  • Fe (hydr)oxide
  • Metal cations
  • Molar ratio
  • Tetracycline

ASJC Scopus subject areas

  • General

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