POTENTIAL APPLICATION OF ZEOLITE/MNPS COMPOSITE FOR THE REMOVAL OF CRYSTAL VIOLET IN AQUEOUS SOLUTION

Abstract

This research introduced a simple synthesis of zeolite/MNPs composite at conditions as follows: a weight ratio of MNPs:zeolite = 1:4 (w/w), a volume ratio of ethanol:H₂O = 1:10 (v/v), 5 mL tetraethyl orthosilicate (TEOs), 90^oC and 4 hours. Some analysis methods such as XRD, FTIR and SEM were used to determine the presence of MNPs and zeolite with the uniform shape, size and distribution. The chemical composition was analyzed using XRF with the content of SiO₂; Al₂O₃ and Fe₂O₃ of 41.11%; 27.75% and 30.78%, respectively. Moreover, the evaluation of crystal violet (CV) removal was implemented at pH ~ 7, CV dosage of 0.75 g/L, initial CV concentration of 100 mg/L and contact time of 30 minutes, the adsorption capacity and efficiency were 103.37 mg/g and 70.64%, respectively. The CV adsorption fitted with the Sips isotherm model and Elovich kinetic model. The adsorption mechanism is mainly to adsorb on the surface heterogeneously and a physical adsorption. The CV adsorption efficiency decreases from 70.64% to 42.26% after 5 cycles. The above results also reveal a potential application of zeolite/MNPs composite towards the wastewater treatment including organic dyes.