Partitioning and Diffusivity of arsenic(III) in the Active Layer of Thin-Film Composite Reverse Osmosis and Nanofiltration Membranes
Mi, Baoxia
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https://hdl.handle.net/2142/83304
Description
Title
Partitioning and Diffusivity of arsenic(III) in the Active Layer of Thin-Film Composite Reverse Osmosis and Nanofiltration Membranes
Author(s)
Mi, Baoxia
Issue Date
2006
Doctoral Committee Chair(s)
Mariñas, Benito J.
Department of Study
Civl and Environmental Engineering
Discipline
Civl and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Environmental
Language
eng
Abstract
The main objective of this study, therefore, was to understand the mechanism controlling the permeation of a neutral molecule (arsenic (III)) through RO/NF membranes. The permeation of potassium iodide (KI), used as background electrolyte, was also investigated. This study introduced Rutherford backscattering spectrometry (RBS) into the membrane field. Major achievements were made from three perspectives: (1) successful characterization of membrane physico-chemical properties, including elemental composition, thickness and roughness of membrane active layer; (2) characterization of the partitioning behavior of neutral and ionic species at various pH and concentration conditions; (3) differentiation of diffusive permeation from advection with permeation data using a simplified solution-diffusion model. By integrating obtained information on membrane properties, solute-membrane interactions, and rejection performance, a better understanding on the mechanisms controlling the transport of neutral and ionic species through RO/NF membranes was attained.
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