NDLI: Kinetic study of time-dependent fixation of U on biochar.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Young, S. D. Ashry, A. Chenery, S. R. N. Bailey, E. H.
Description	Country affiliation: Egypt Author Affiliation: Ashry A ( Division of Agricultural and Environmental Sciences, School of Biosciences, University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom); Bailey EH ( Division of Agricultural and Environmental Sciences, School of Biosciences, University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom. Electronic address: liz.bailey@nottingham.ac.uk.); Chenery SR ( British Geological Survey, Nicker Hill, Keyworth, Nottingham NG12 5GG, United Kingdom.); Young SD ( Division of Agricultural and Environmental Sciences, School of Biosciences, University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, United Kingdom.)
Abstract	Biochar, a by-product from the production of biofuel and syngas by gasification, was tested as a material for adsorption and fixation of U from aqueous solutions. A batch experiment was conducted to study the factors that influence the adsorption and time-dependent fixation on biochar at 20°C, including pH, initial concentration of U and contact time. Uranium (U ) adsorption was highly dependent on pH but adsorption on biochar was high over a wide range of pH values, from 4.5 to 9.0, and adsorption strength was time-dependent over several days. The experimental data for pH>7 were most effectively modelled using a Freundlich adsorption isotherm coupled to a reversible first order kinetic equation to describe the time-dependent fixation of U within the biochar structure. Desorption experiments showed that U was only sparingly desorbable from the biochar with time and isotopic dilution with U confirmed the low, or time-dependent, lability of adsorbed U . Below pH 7 the adsorption isotherm trend suggested precipitation, rather than true adsorption, may occur. However, across all pH values (4.5-9) measured saturation indices suggested precipitation was possible: autunite below pH 6.5 and either swartzite, liebigite or bayleyite above pH 6.5.
ISSN	03043894
Journal	Journal of Hazardous Materials
Volume Number	320
e-ISSN	18733336
Language	English
Publisher	Elsevier
Publisher Date	2016-12-15
Publisher Place	Netherlands
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Waste Management and Disposal Health, Toxicology and Mutagenesis Environmental Engineering

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