Environment and Ecology Research Vol. 2(2), pp. 97 - 106
DOI: 10.13189/eer.2014.020206
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Counterion Effects on the Adsorption of Acid Orange 8 from Aqueous Solution onto HDTMA-Modified Nanozeolite from Fly Ash

Denise A. Fungaro , Carina P. Magdalena ^*
Nuclear and Energy Research Institute (IPEN – CNEN/SP), São Paulo, Brazil

ABSTRACT

Surfactant-modified nanozeolites from coal fly ash were used for the removal of Acid Orange 8 (AO8) from water. The zeolitic material was modified by two cationic surfactants i. e., hexadecyltrimethyl ammonium bromide (HDTMA-Br) and hexadecyltrimethyl ammonium chloride (HDTMA-Cl). Both the modified nanozeolites were characterized using various techniques to obtain its physical and chemical constituents. The adsorbents before and after adsorption were characterized by X-ray diffraction (XRD). The dynamical data obtained at different concentrations for the two organozeolites fit well with pseudo-second-order kinetic model. The equilibrium adsorption data were interpreted in terms of the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models. The results showed that the adsorption of AO8 was influenced by HDTMA-zeolite counterion. Zeolite modified with HDTMA-Br was most efficient than zeolite modified with HDTMA-Cl for AO8 removal. Negative values of Gibbs free energy change (ΔG^o) for dye adsorption onto HDTMA-modified zeolites indicates that the adsorption process is spontaneous and thermodynamically favorable. As a result, surfactant-modified nanozeolites from coal fly ash could be used as effective adsorbents for AO8 removal from wastewater.

KEYWORDS
Coal Fly Ash, Zeolite, Adsorption, HDTMA Surfactant, Acid Orange 8

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Denise A. Fungaro , Carina P. Magdalena , "Counterion Effects on the Adsorption of Acid Orange 8 from Aqueous Solution onto HDTMA-Modified Nanozeolite from Fly Ash," Environment and Ecology Research, Vol. 2, No. 2, pp. 97 - 106, 2014. DOI: 10.13189/eer.2014.020206.

(b). APA Format:
Denise A. Fungaro , Carina P. Magdalena (2014). Counterion Effects on the Adsorption of Acid Orange 8 from Aqueous Solution onto HDTMA-Modified Nanozeolite from Fly Ash. Environment and Ecology Research, 2(2), 97 - 106. DOI: 10.13189/eer.2014.020206.