Characterization of the binding site affinity distribution of a surfactant-modified clinoptilolite

Influences of clinoptilolite and surfactant-modified clinoptilolite zeolite on nitrate leaching and plant growth

“…At the HDTMA sorption maximum, the surfactant molecules form bilayers on zeolite surfaces with the lower layer held by electrostatic interactions between the negatively charged zeolite surface and the positively charged surfactant head groups, while the upper layer is bound to the lower layer by hydrophobic forces between the surfactant tail groups in both layers [16]. Under the surfactant bilayer configuration, the zeolite reverses its surface charge, resulting in a higher affinity, sorption, and retention of negatively charged anionic contaminants that is attributed to surface anion exchange [16][17][18]. The use of surfactant-modified zeolite (SMZ), which represents a type of inexpensive anion exchanger, to remove anionic contaminants from water has been studied extensively [18][19][20].…”

Removal of Cr(VI) and As(V) from aqueous solutions by HDTMA-modified zeolite Y

“…Recent study by Campos showed that the modification of mordenite by ethylhexadecyldimethyl ammonium (EHDDMA) and hexadecyltrimethyl ammonium (HDTMA) can remove hexavalent chromium [14]. In addition, Perez Cordoves and his co-workers [15] have studied for the first time that the affinity distribution analysis combined with the Freundlich binding model allows the characterization of the SMZ binding properties for Cr(VI). Besides that, the surfactant-modified natural zeolites such as stilbite and laumontite [16] and clinoptilolite-heulandite rich tuffs [17] were also used to remove arsenic from water and the results showed that the SMZ from clinoptilolite can remove As(V) more than As(III) [18].…”

Adsorption of As(V) on surfactant-modified natural zeolites

“…Sorption of arsenic on natural zeolites has been studied extensively in recent years due to their low cost and availability in nature [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30]. In contrast, arsenic sorption by surfactant-modified natural zeolites natural mordenite (NM) and natural clinoptilolite (NC) collected from Miyagi and Akita prefecture, Japan, respectively by sorption of cationic surfactant hexadecyltrimethylammonium (HDTMA) bromide in order to create more anion sorption sites.…”