Structural and textural influences of surfactant-modified zeolitic materials over the methamidophos adsorption behavior

ABSTRACT

In this work, a natural zeolite previously conditioned with NaCl solution was modified with different hexadecyltrimethylammonium-bromide concentrations for methamidophos removal. All materials were characterized by diverse analytical techniques. Methamidophos adsorption behavior was studied by using batch experiments. Main structural and textural differences of surfactant-modified zeolitic materials were correlated with methamidophos adsorption capacity. Methamidophos adsorption was enhanced when zeolitic materials were modified with HDTMA and, more significantly, when a 25 mmol/L surfactant concentration was used, achieving a maximum adsorption capacity of 1.13 mg/g due to its pore surface modification. In this way, methamidophos adsorption present in aqueous solution was improved.

KEYWORDS:

• Surfactant-modified zeolitic materials
• methamidophos adsorption
• textural properties
• structural properties
• hexadecyltrimethylammonium bromide

Acknowledgments

The authors acknowledge the financial support from Consejo Nacional de Ciencia y Tecnología (Project 215997), Instituto Nacional de Investigaciones Nucleares and Consejo Nacional de Ciencia y Tecnología scholar Grant No. 412258.