Mechanisms of Selected Anionic Dye Removal by Clinoptilolite

The extensive use of color dyes in modern society has resulted serious concerns water contamination. Many organic bear charges; thus, materials opposite charges have been tested for sorptive removal. However, the results from several studies also showed that anionic methyl orange (MO) and alizarin red S (ARS) could be removed using minerals negative charges, but mechanisms were not addressed. In this study, negatively charged clinoptilolite was its removal MO ARS under different physico-chemical conditions to investigate mechanism Mo sorption capacities 166 92 mmol/kg ARS, respectively, confirming uptake on framework silicates. influence solution pH ionic strength minimal, indicating strong affinity comparison other inorganic species. It speculated N dimethyl group may a partial positive charge, which net electrostatic attraction mineral surfaces sorption. For involve hydrogen bonding formation between dye clinoptilolite. Moreover, experimental conditions, molecules form dimers via dimeric π-π interactions. Thus, or aggregation monomers surface attributed additional removal, as suggested by molecular dynamic simulations. speculation supported FTIR analyses As such, Earth used sorbents certain sorption, new perspective innovative materials.