Removal of arsenate using graphene oxide-iron modified clinoptilolite-based composites: adsorption kinetic and column study

Abstract In this study, graphene oxide (GO), iron modified clinoptilolite (FeZ), and composites of GO-FeZ (GOFeZA GOFeZB) were synthesized characterized using SEM, EDS, XRF, FTIR, pH pzc . The arsenate uptake on GOFeZA GOFeZB was examined by both kinetic column studies. adsorption capacity increases with the increase initial concentration at equilibrium for composites. At 450 μg/L, 557.86 554.64 μg/g, respectively. Arsenate showed good compatibility pseudo second order model. process explained surface complexation or ion exchange electrostatic attraction between ions in aqueous solution due to relatively low time fairly rapid beginning process. mechanism confirmed characterization studies performed after loaded onto fixed-bed experiments that increasing flow rate through resulted a decrease empty bed contact time, breakthrough volume treated water. As result continuous operation study regenerated GOFeZA, it demonstrated has lower water compared fresh GOFeZA.