Transport Model for the Adsorption of Oxyanions of Selenium (IV) and Arsenic (V) from Water onto Lanthanum- and Aluminum-Based Oxides

✍ Scribed by S.A. Davis; M. Misra

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 210 KB
• Volume: 188
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1997.4775

✦ Synopsis

drotalcite-like) adsorbent (4). Since lanthanum oxide is A model for the adsorption of oxyanions of selenium (IV) and more electropositive than magnesium oxide, LA (T) is better arsenic (V) as a function of time and pH was developed and tested suited to remove negative ions, such as oxy-anions of seleon LA (T) (10% lanthanum oxide/90% activated g-alumina mixednium and arsenic, than SORBPLUS, particularly at low conoxide), lanthanum oxide, activated g-alumina, and activated acentrations (4).

alumina. A good correlation between the transport model and

In this study, a time-dependent transport model is develexperimental results were observed. The model showed strong evioped for the batch adsorption of selenium, arsenic, and hydence that the adsorption of oxyanions of selenium and arsenic drogen onto LA (T) , lanthanum, and aluminum oxides. Future at the oxide-water interface is governed by three gradients: conuses of the model will be to describe the uptake of oxycentration, potential, and ionic size. Lanthanum oxide was observed to be a better adsorbent for selenium than activated g-anions of selenium and arsenic from a multicomponent alumina and a-alumina. At the same initial selenium concentrawastewater stream in designing packed bed columns. Theretion, g-alumina was a better adsorbent for selenium as compared fore, the model is rigorous enough to account for the large to a-alumina. ᭧ 1997 Academic Press matrix of elements and species and the diverse conditions in which wastewater exists and is simple to use.

Previous researchers who have developed adsorption 1 To whom correspondence should be addressed.

face hydroxyl groups. The chemical free energy is a function 340