The removal of the textile basic dye from the water solution by using natural zeolite

Abstract

The use of natural zeolite for elimination of the textile basic dye from the water solution was researched in this paper. The practical simulation of purification of waste water from the textile industry was done. Zeolite was characterized by physical and chemical analysis. SiO 2 dominates the chemical structure of the adsorbent, followed by: Al 2 O 3 , CaO, Fe 2 O 3 , K 2 O. The used natural adsorbent -zeolite is a relatively fine bulk material with heterogenic porous particles, generally smaller than 45 µm. The effect of the initial dye concentration, pH and mixing time was investigated. In lower concentrations, the percentage of the removed dye is higher, but generally observed, a larger amount od dye is absorbed onto zeolite at higher initial concentrations. Longer adsorption time with a higher initial concentration results in a larger amount of the dye adsorbed by the adsorbent. The results confirm that all varied input parameters influence the efficiency of the basic dye adsorption and that the used natural zeolite, as adsorbent, has fulfilled the expectations considering the dye level after adsorption (the amount of the removed dye >82% at pH 4).

Natural mordenite-rich tuff as an alternative for removing textile dyes (Asucryl red): adsorption properties, kinetic and equilibrium studies

“…The presence of mordenite may influence the dissociation and the surface charge of the dye. In this context, the adsorption capacity is related to the adsorbent surface charge, the degree of ionization of the molecules and the dissociation of active adsorption functional groups (Amin et al , 2017).

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“…The presence of mordenite may influence the dissociation and the surface charge of the dye. In this context, the adsorption capacity is related to the adsorbent surface charge, the degree of ionization of the molecules and the dissociation of active adsorption functional groups (Amin et al, 2017). Maximum dye removal at acidic pH levels may be attributed to surface protonation reactions that decrease the competition between H 3 O + ions and the dye.…”