Effect of ozonation on the activated carbon surface chemical properties and on 2-mercaptobenzothiazole adsorption

Valdes, H.; Sanchez-Polo, M; Zaror, CA

Abstract

Benzothiazoles are organic compounds that may produce negative environmental impact when released into watercourses. In particular, 2-mercaptobenzothiazole (MBT) are known to be toxic and hard to biodegrade. Activated carbon adsorption and ozonation have been identified as suitable treatment for those contaminants. However, there is some controversy about the effect of carbon surface chemical composition on the MBT adsorption. This paper focuses on this issue and presents experimental adsorption isotherms for MBT on Filtrasorb-400 activated carbon treated with different ozone doses. The activated carbon surface chemical properties were assessed by acid/basic neutralization, temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS), and the point of zero charge (pHPZC). Results show that ozone treatment modified the oxygenated groups on the activated carbon surface, increasing the concentration of acid groups, and reducing the pHPZC. Finally, ozone treatment led to a significant reduction of the carbon's MBT adsorption capacity, due to the increase in polar hydrophilic groups.

Más información

Título según WOS: Effect of ozonation on the activated carbon surface chemical properties and on 2-mercaptobenzothiazole adsorption
Título según SCOPUS: Effect of ozonation on the activated carbon surface chemical properties and on 2-mercaptobenzothiazole adsorption
Título de la Revista: LATIN AMERICAN APPLIED RESEARCH
Volumen: 33
Número: 3
Editorial: PLAPIQUI(UNS-CONICET)
Fecha de publicación: 2003
Página de inicio: 219
Página final: 223
Idioma: English
Notas: ISI, SCOPUS