Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 36, Issue 4, Pages 582-587Publisher
AMER CHEMICAL SOC
DOI: 10.1021/es010996t
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Experiments were conducted to investigate the fund a menta Is of silica sorption onto preformed ferric hydroxide at pH 5.0-9.5 and silica concentrations of 0-200 mg/L as SiO2. At all pHs studied, sorption densities exceeding monolayer sorption were observed at silica levels typical of natural waters. Under some circumstances, sorption equaled or exceeded a monolayer while the particle zeta potential remained positive, a phenomenon that is completely inconsistent with available surface complexation models. To address this deficiency, an extended surface complexation model was formulated in which soluble dimeric silica (i.e., Si2O2(OH)(5)(-)) sorbs directly to iron surface sites. This new model fit sorption density data up to 0.40 mol SiO2/ mol Fe and accurately predicted trends in zeta potential and observed H+ release during silica sorption to ferric hydroxide.
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