Adsorption behavior of tetracycline by extracellular polymeric substrates extracted from Klebsiella sp. J1

Ang Li; Shanshan Pi; Wei Wei; Ting Chen; Jixian Yang; Fang Ma

doi:10.1007/s11356-016-7726-6

Adsorption behavior of tetracycline by extracellular polymeric substrates extracted from Klebsiella sp. J1

Environ Sci Pollut Res Int. 2016 Dec;23(24):25084-25092. doi: 10.1007/s11356-016-7726-6. Epub 2016 Sep 27.

Authors

Ang Li¹, Shanshan Pi², Wei Wei², Ting Chen², Jixian Yang², Fang Ma³

Affiliations

¹ State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China. li.ang@hit.edu.cn.
² State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China.
³ State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China. mafang@hit.edu.cn.

PMID: 27677997
DOI: 10.1007/s11356-016-7726-6

Abstract

The extracellular polymeric substrate (EPS) extracted from Klebsiella sp. J1 was used to adsorb low concentrations of tetracycline, and the efficiency and mechanism of tetracycline adsorption by EPS from strain J1 were studied. Adsorption efficiency was evaluated at different conditions. Results showed that optimal adsorption efficiency was 71.68 % with 60 mg L^-1 of EPS from strain J1 and 90 μL of 10 % (w/v) CaCl₂ in 100 mL of tetracycline solution (80 μg L^-1) with pH of 8.0. Experimental data was fitted well with Langmuir, Freundlich isotherm, and pseudo-second-order models. Analyses of E value, Ea value, thermodynamics, zeta potential variation, and Fourier transform infrared spectroscopy (FTIR) spectra proved that chemisorption was the main adsorption type and bridging was the main adsorption mechanism. Thermodynamic analysis indicated that adsorptive reaction was exothermic from 20 to 40 °C. In addition, humic acid (HA) showed little effect on the tetracycline adsorption by MFX.

Keywords: Adsorption; Characterization; Extracellular polymeric substrates; Humic acid; Klebsiella sp. J1; Tetracycline.

MeSH terms

Adsorption
Anti-Bacterial Agents / chemistry*
Biopolymers / chemistry*
Humic Substances
Klebsiella
Spectroscopy, Fourier Transform Infrared
Tetracycline / chemistry*
Thermodynamics
Water Pollutants, Chemical / chemistry*

Substances

Anti-Bacterial Agents
Biopolymers
Humic Substances
Water Pollutants, Chemical
Tetracycline