Characteristics and model studies for fluoride and arsenic
adsorption on goethite |
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Authors: | Yulin Tang Jianmin Wang and Naiyun Gao |
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Institution: | 1. State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China 2. Department of Civil, Architectural & Environmental Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA |
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Abstract: | Fluoride and arsenic are major anionic elements of concern in drinking water treatment. The effects of contact time, pH, surface
loading and ionic strength on adsorption of fluoride and As(V) were investigated using batch methods. Adsorption of fluoride and
As(V) onto goethite obeyed a pseudo second-order rate law. Through experimental data and adsorption kinetic analysis, the affinity of
As(V) onto goethite was stronger than fluoride. Fluoride and As(V) uptake by goethite all decreased with pH increasing at the same
surface loading; however, ionic strength had slight influence on their adsorption. A surface sites-species model was used to quantify
the adsorption of fluoride and As(V) onto goethite as function of pH and surface loading. This model can satisfactorily predict their
adsorption characteristics with several adsorption constants. |
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Keywords: | adsorption fluoride arsenic goethite |
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