Effects of the adsorption of NOM model molecules on the aggregation of TiO2 nanoparticles in aqueous suspensions

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Danielsson, KarinUniversity of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology (author)

Effects of the adsorption of NOM model molecules on the aggregation of TiO2 nanoparticles in aqueous suspensions

Article/chapterEnglish2018

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Elsevier BV,2018

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LIBRIS-ID:oai:gup.ub.gu.se/268872
https://gup.ub.gu.se/publication/268872URI
https://doi.org/10.1016/j.impact.2018.05.002DOI
https://lup.lub.lu.se/record/f1c020ad-d4d1-421a-9a05-b361164f1a40URI

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Language:English

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Subject category:art swepub-publicationtype

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© 2018 Interaction of synthetic TiO2(anatase) nanoparticles in aqueous suspension at pH 5 was investigated as a function of time in the presence of various organic molecules in terms of adsorption and aggregation behaviour. ζ-potential and average particle diameter were determined with electrophoretic and dynamic light scattering, respectively, while batch adsorption experiments were used to quantify the amount of organic ligand adsorbed to the TiO2NP. An IR spectroscopic study was carried out at pH 2.8 and 5 to gain information about the interactions of the adsorbed molecules with the TiO2surface on the molecular level. Furthermore, DLVO calculations provided information about the interaction energies between particles and their tendency to aggregate under some experimental conditions. Colloidal stability of TiO2NPs in the presence of organic molecules was studied during a time period of up to 90 days. Results showed that ligands with different functional groups may interact differently with the surface depending on the type and position of available surface sites, the molecular structure of the ligand and suspension pH. Adsorption, hydrodynamic diameter and ζ-potential were affected by the ligand concentration in all tested systems. Increased concentration gave rise to increased adsorption, while ζ-potential decreased and charge inversion was observed for all tested molecules at pH 5. IR spectroscopic study showed the formation of inner sphere and/or outer sphere complexes depending on pH and type of organic ligand. According to DLVO calculations, the critical coagulation concentration (CCC) indicated a trend of increasing colloidal stability with increased concentration of SRFA at pH 5, which was in agreement with the experimental data.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
NATURVETENSKAP Kemi Analytisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Analytical Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Nanoteknik hsv//swe
ENGINEERING AND TECHNOLOGY Nano-technology hsv//eng
NATURVETENSKAP Kemi Fysikalisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Physical Chemistry hsv//eng
TEKNIK OCH TEKNOLOGIER Naturresursteknik Annan naturresursteknik hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Other Environmental Engineering hsv//eng
Adsorption
Aggregation
DLVO
Fulvic acid
IR spectroscopy
Organic molecules
TiO nanoparticles 2
ζ-potential
TiO nanoparticles

Added entries (persons, corporate bodies, meetings, titles ...)

Persson, P.Lund University,Lunds universitet,Centrum för miljö- och klimatvetenskap (CEC),Naturvetenskapliga fakulteten,Centre for Environmental and Climate Science (CEC),Faculty of Science(Swepub:lu)cec-ppn (author)
Gallego-Urrea, Julian A.,1977University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences(Swepub:gu)xurrju (author)
Abbas, Zareen,1962University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology(Swepub:gu)xabbza (author)
Rosenqvist, JörgenUniversity of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology (author)
Jonsson, Caroline,1977University of Gothenburg,Gothenburg University,Göteborgs universitet,Institutionen för kemi och molekylärbiologi,Department of Chemistry and Molecular Biology(Swepub:gu)xjonca (author)
Göteborgs universitetInstitutionen för kemi och molekylärbiologi (creator_code:org_t)

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In:NanoImpact: Elsevier BV10, s. 177-1872452-0748

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Nano technology

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