Removal of chromate anions and immobilization using surfactant-modified zeolites

•Vitrification of spent zeolitic adsorbent captured successfully chromate ions.•Surface modification of two zeolites enabled superior removal of Cr from water.•The presence of CH2 group is related to the significant increase to attract anions.•Restricted pores of LTA limited the incorporation of HDT...

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Bibliographic Details
Published in:	Journal of water process engineering Vol. 39; p. 101717
Main Authors:	Dimas Rivera, Gloria Lourdes, Martínez Hernández, Annia, Pérez Cabello, Anna Fernanda, Rivas Barragán, Ericka Lilian, Liñán Montes, Adriana, Flores Escamilla, Gerardo Antonio, Sandoval Rangel, Ladislao, Suarez Vazquez, Santiago Ivan, De Haro Del Río, David Alejandro
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-02-2021
Subjects:	Chromium uptake Spent adsorbent Surface modified zeolites Vitrification Spent adsorbent Surface modified zeolites Vitrification Chromium uptake
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Summary:	•Vitrification of spent zeolitic adsorbent captured successfully chromate ions.•Surface modification of two zeolites enabled superior removal of Cr from water.•The presence of CH2 group is related to the significant increase to attract anions.•Restricted pores of LTA limited the incorporation of HDTMA, thus, adsorption of Cr. In this research surface modified zeolites, Linde Type A and clinoptilolite, were used for the chromate ions uptake from aqueous solutions as well as its encapsulation through a vitrification process. The surface chemistry of zeolites was modified using a cationic surfactant hexadecyltrimethylammonium (HDTMA) to promote the capability of anions uptake. The results of characterization by X-ray diffraction showed unique crystalline phases for each zeolite which remain unchanged after the incorporation of the surfactant. Evidence from Fourier-transform infrared spectroscopy studies revealed the effective bond of the HDTMA on the clinoptilolite surface. Results suggested that the presence of CH2− groups after the modification play a key role for the anion attraction. Kinetic studies revealed that surfactant-modified clinoptilolite was able to adsorb 9.83 mg/g of chromate and better fitted pseudo-second order model (R2 = 0.957). The equilibrium was better represented by Freundlich model (R2 = 0.993). Finally, the proposed vitrification process the spent zeolitic adsorbent was successful, avoiding leaching of chromate ions after two months at different pH values.
ISSN:	2214-7144 2214-7144
DOI:	10.1016/j.jwpe.2020.101717