Reactions between bacterial exopolymers and goethite: A combined macroscopic and spectroscopic investigation

Linchuan Fang; Yuanyuan Cao; Qiaoyun Huang; Sharon L. Walker; Peng Cai

doi:10.1016/j.watres.2012.07.046

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Reactions between bacterial exopolymers and goethite: A combined macroscopic and spectroscopic investigation

Journal article

Peer reviewed

Reactions between bacterial exopolymers and goethite: A combined macroscopic and spectroscopic investigation

Linchuan Fang, Yuanyuan Cao, Qiaoyun Huang, Sharon L. Walker and Peng Cai

Water research (Oxford), v 46(17), pp 5613-5620

01 Nov 2012

DOI: https://doi.org/10.1016/j.watres.2012.07.046

PMID: 22921391

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Abstract

Adsorption

EPS

Goethite

ITC

XAFS

The adsorption to goethite of extracellular polymeric substances (EPS) isolated from Pseudomonas putida was investigated using batch adsorption experiments, electrophoretic mobility (EM) measurements, Fourier transform infrared (FTIR) spectroscopy, isothermal titration calorimetry (ITC) and X-ray absorption fine structure (XAFS) spectroscopy. The adsorption of EPS decreased the point of zero charge of goethite from 7.6 to 3.2, suggesting the formation of negatively charged inner-sphere surface complexes. The adsorption isotherms of EPS on goethite conformed to the Langmuir equation. The adsorption energy constant (K) of EPS on goethite was in the sequence of EPS phosphate-containing moieties > nitrogen-containing moieties > carbon-containing moieties, indicating those containing phosphate were the most strongly adsorbed. FTIR showed ligand exchange of phosphate groups of EPS with surface hydroxyls on goethite. Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy results further demonstrated phosphate groups of EPS can form monodentate inner-sphere complexes at lower pH 3.0, while form bidentate inner-sphere complexes at higher pH 9.0. The oxidation state of iron in goethite was not changed after the reaction with EPS at different pH values. The information obtained in this study is of fundamental significance for the understanding of the interaction mechanisms between bacteria and minerals in soil and aquatic environments. [Display omitted] ► The adsorption to goethite of EPS was investigated at molecular level. ► P–O–Fe bonds were formed between EPS phosphoryl groups and goethite. ► Inner-sphere complexes types changed from monodentate to bidentate with pH. ► The chemical bonds contribute to bacterial adhesion.

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Details

Title: Reactions between bacterial exopolymers and goethite: A combined macroscopic and spectroscopic investigation
Creators: Linchuan Fang - Huazhong Agricultural University
Yuanyuan Cao - Huazhong Agricultural University
Qiaoyun Huang - Huazhong Agricultural University
Sharon L. Walker - University of California, Riverside
Peng Cai - Huazhong Agricultural University
Publication Details: Water research (Oxford), v 46(17), pp 5613-5620
Publisher: Elsevier
Resource Type: Journal article
Language: English
Academic Unit: College of Engineering
Web of Science ID: WOS:000309297100016
Scopus ID: 2-s2.0-84865966050
Other Identifier: 991021229997104721

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Collaboration types: Domestic collaboration; International collaboration
Web of Science research areas: Engineering, Environmental; Environmental Sciences; Water Resources