Synthesis of new granular surfactant iron pillared montmorillonite with gluten: Application to the removal of cationic dyes in mixture systems

Abstract

A series of novel resistant granular sorbents based on iron granular surfactant modified pillared montmorillonite and gluten as binder noted (Fe-GSMPM) are prepared and used in adsorption towards hydrosoluble micropollutants. The batch sorption of Malachite Green (MG) and/or Rhodamine B (RB) both on single and binary component systems from aqueous solutions was investigated. In all used component systems, sorption capacities were depending both on the pH and the granule size. In single component systems, results showed that sorption on Fe-GSMPM are very effective and more quickly with MG than RB with obtained amounts reached more than 9 and 6 mg/g at pH = 6 and strongly decreased more than 3 mg/g for both solutes at pH = 3, respectively. In binary component systems at different weight ratios r (MG/RB = 1/9, 1/3, 1, 3 and 9) and at pH 6, the sorption capacities decreased significantly with values lower than those obtained in single-component systems. Isotherms were best described using the Freundlich model in single component systems with R² reach 0.9. In binary mixture systems, results indicate that the Sheindorf–Rebhun–Sheintuch (SRS) model provides the best correlation of the experimental data by the higher competition coefficients, which increase with decreasing weight MG/RB ratio.