Adsorption of Surfactants, Dyes and Cationic Herbicides on Sepiolite and Palygorskite: Modifications, Applications and Modelling

摘要: Abstract Adsorption of organic molecules, such as surfactants, dyes and cationic herbicides on sepiolite palygorskite, is reviewed with an emphasis modelling applications. The experimental procedures employed in the studies included adsorption, XRD, SEM, HRTEM, FTIR, zeta potential thermal analysis measurements. surfactants whose adsorption interactions clay minerals were studied anionic, neutral ones. These two clays are structurally similar, having a similar content zeolitic bound water IR absorption pattern; differences include larger b axis surface area per weight, fraction MgO smaller fractions Al2O3 Fe2O3 case sepiolite. Modelling cations by considered electrostatic equations Gouy–Chapman specific binding closed system. In monovalent cations, model considers complexes formed from cation to negatively charged site, positively ones which another complex. Both have abundance silanol (Si OH) sites external surfaces. number these N exceeds several-fold sites, that is, CEC (cation-exchange capacity). accounts for ability adsorb silicate layer. adsorbed amounts dyes, methylene blue crystal violet more than fourfold CEC. contrast, largest divalent paraquat, diquat methyl green between 100% 140% its This outcome suggested do not interact assumption was confirmed measurements, did show changes peaks arising vibrations Si OH groups clay, when added, unlike clearly observed added mineral. succeeded simulate yield predictions palygorskite.