by nano-sized ferrihydrite organo-mineral composites formed by

Phone numbers: +86 0731-84618034. 15 ... 40. Keywords: ferrihydrite; organo composite; Pb; sorption; coprecipitation; XAS. 41. 42. Page 2 of 30. ACS P...
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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