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Sorption of Pb(II) by nano-sized ferrihydrite organo-mineral composites formed by adsorption versus coprecipitation Huihui Du, Qiaoyun Huang, Ming Lei, and Boqing Tie ACS Earth Space Chem., Just Accepted Manuscript • DOI: 10.1021/ acsearthspacechem.8b00005 • Publication Date (Web): 26 Mar 2018 Downloaded from http://pubs.acs.org on March 27, 2018
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ACS Earth and Space Chemistry
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Sorption of Pb(II) by nano-sized ferrihydrite organo-mineral composites formed
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by adsorption versus coprecipitation
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Huihui Du, 1, 2, 3, 4 Qiaoyun Huang, 2, * Ming Lei, 1, 3, 4 Boqing Tie 1, 3, 4 *
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College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
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Environment, Huazhong Agricultural University, Wuhan 430070, PR China
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Hunan Engineering Research Center for Safe and High-Efficient Utilization of Heavy Metal Pollution Farmland, Changsha 410128, PR China
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State Key Laboratory of Agricultural Microbiology, College of Resources and
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Key Laboratory of Southern Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture, Changsha 410128, PR China
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*Corresponding Author: Boqing Tie and Qiaoyun Huang
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Email:
[email protected];
[email protected] ;
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Phone numbers: +86 0731-84618034
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Postal address: 1st Nongda Road, Furong District, Changsha City, China.
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ACS Paragon Plus Environment
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ABSTRACT
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Nano-sized iron hydroxides and organic matter (OM) are important scavengers of
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nutrient elements and dissolved trace-metals in geologic systems. Despite this, little is
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known about the sorption characteristics of metals to the iron–OM nano-composites
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formed by adsorption (adsorption of OM on pre-synthesis ferrihydrite) versus
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coprecipitation (formation of ferrihydrite in the presence of OM). This study
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investigates lead (Pb) sorption behaviors on ferrihydrite–humic acid (Fh–HA)
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composites through batch sorption coupled with Pb-LIII EXAFS. We report that
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composites formed by coprecipitation have a higher carbon content, smaller specific
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surface area, and faster Pb sorption rate compared to the equivalent composites
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formed by adsorption of HA to preformed Fh. Pb sorption on the composites is
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enhanced at pH
