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

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

SUBMITTER: Hsu LC 

PROVIDER: S-EPMC5882719 | biostudies-literature | 2018 Mar

REPOSITORIES: biostudies-literature