An Extended Langmuir Adsorption in a Binary-Solute As(III)/As(V) System using Nanoporous Alumina

摘要

Arsenic is usually found in the form of inorganic oxyanions. Arsenate (I.e.,HAsO4 2- ) is the primary anion in aerobic surface water, and arsenite (I.e., H3AsO3 or H2AsO3 - ) is the primary species in groundwater. Arsenate has a valence state of As(V), while arsenite is As(III). To remove arsenic, we has been studied the usage of nanoporous aluminas (NA) as potential adsorbents. The maximum up-take of As(V) by NA was found to be 7 times higher [121 mg of As(V)/g and 47 mg of As(III)/g] than that of conventional activated alumina. This experiment was conducted with the single stock solution. Although considerable uptake has been reported for the adsorption of either single-component arsenite or arsenate by various adsorbents, many natural streams or industrial effluents contain several other components. Therefore, in this study, we reported an extended Langmuir adsorption in a binary-solute system using NA. The results would provide basic parameters for the design of adsorption process of As(III) and As(V) in a binary-solute system.