期刊
IONICS
卷 17, 期 3, 页码 263-270出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-010-0505-3
关键词
Rice husk ash; Adsorption isotherm; Metal ions; Kinetic and desorption
An attempt at the use of rice husk ash, an agricultural waste, as an adsorbent of Zn(II) and Se(IV) from their aqueous solution is studied. Studies are carried out as a function of contact time, metal ion concentration, adsorbent dose, and pH at 25 A degrees C. Its adsorption capability and adsorption rate are considerably higher and faster for Zn(II) ions than for Se(IV) ions. Zn(II) adsorption was found fast reaching equilibrium within a parts per thousand integral 1 h while Se(IV) adsorption was slow reaching equilibrium within a parts per thousand integral 100 h. The Bangham equation can be used to express the mechanism for adsorption. The experimental isotherm data were analyzed using Langmiur, Freundlich, and Temkin models. Desorption experiments were carried out using different media with a view to regenerate the spent adsorbent and to recover the adsorbed metal ion.
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