Removal of chromate anions and immobilization using surfactant-modified zeolites

Autor: David A. De Haro Del Río, Adriana Liñán Montes, Annia Martínez Hernández, Gloria Lourdes Dimas Rivera, Santiago Ivan Suarez Vazquez, Ladislao Sandoval Rangel, Ericka Lilian Rivas Barragán, Gerardo Antonio Flores Escamilla, Anna Fernanda Pérez Cabello
Rok vydání: 2021
Předmět:
Zdroj: Journal of Water Process Engineering. 39:101717
ISSN: 2214-7144
DOI: 10.1016/j.jwpe.2020.101717
Popis: 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.
Databáze: OpenAIRE
Externí odkaz: