@article{bb853f2c14b1439e87c9ac6a528c889f,
title = "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 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.",
keywords = "Adsorption, Fe (hydr)oxide, Metal cations, Molar ratio, Tetracycline",
author = "Hsu, {Liang Ching} and Liu, {Yu Ting} and Syu, {Chien Hui} and Huang, {Mei Hsia} and Tzou, {Yu Min} and Teah, {Heng Yi}",
note = "Funding Information: This study was financially supported by the Ministry of Science and Technology, ROC under project nos. NSC 101-2621-M-005-005, NSC 102-2621-M-005-001, MOST103-2621-M-005-002 and MOST 104-2313-B-005-014-MY3, and, in part, by the Ministry of Education, ROC under the Aim for Top University (ATU) plan. Funding Information: Data accessibility. The additional experimental procedure, figures and tables supporting this article have been uploaded as part of the electronic supplementary material. Authors{\textquoteright} contributions. Y.T.L., L.C.H. and Y.M.T. wrote the manuscript. This research was designed by Y.M.T. and the experiments were carried out by M.H.H. The data analysis was conducted by Y.T.L., L.C.H., C.H.S. and H.Y.T. All authors reviewed and approved the manuscript. Competing interests. We declare we have no competing interests. Funding. This study was financially supported by the Ministry of Science and Technology, ROC under project nos. NSC 101-2621-M-005-005, NSC 102-2621-M-005-001, MOST 103-2621-M-005-002 and MOST 104-2313-B-005-014-MY3, and, in part, by the Ministry of Education, ROC under the Aim for Top University (ATU) plan. Publisher Copyright: {\textcopyright} 2018 The Authors.",
year = "2018",
month = mar,
day = "28",
doi = "10.1098/rsos.171941",
language = "English",
volume = "5",
journal = "Royal Society Open Science",
issn = "2054-5703",
publisher = "The Royal Society",
number = "3",
}