Thorium sorption in the marine environment: Equilibrium partitioning at the hematite/water interface,sorption/desorption kinetics and particle tracing期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Thorium sorption in the marine environment: Equilibrium partitioning at the hematite/water interface,sorption/desorption kinetics and particle tracing

Authors:

Matthew S Quigley Bruce D Honeyman Peter H Santschi

Institution:

1. Department of Oceanography, Texas A&M University at Galveston, 77551, Galveston, TX, USA
2. Environmental Science and Engineering Division, Colorado School of Mines, 80401, Golden, CO, USA

Abstract:

Thorium(IV) sorption onto hematite ( agr

-Fe₂O₃) was examined as a function of pH and ionic strength. Sorption behaved Langmuirian over an eleven order of magnitude range in adsorption densities, Gamma

: 10^–12 to 10^–1 moles Th sorbed per mole hematite sites, indicating that the overall free energy of Th adsorption is independent of adsorption density. Modeling of Th sorption was conducted with the Triple Layer Model of Davis and Leckie; reactions considered included solution-phase hydroxy and carbonato complexes of thorium, and carbonate/hematite surface complexes. The entire Th sorption isotherm can be modeled with a single surface complex formation reaction

$\equiv Fe - OH + Th^{4 + } \mathop = \limits^{*K_{Th}^{int} } \equiv Fe - OTh^{3 + } + H^ +$

Keywords:	thorium scavenging adsorption irreversibility
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