[Study of eggshell performance as a natural sorbent for the removal of reactive red 198 dye from aqueous solution]

ABSTRACT

Dye compounds is one of the most critical contaminant for natural ecosystems. The aim of this study were to determine the primary concentrations of reactive red 198 dye [RR 198], adsorbent dosage and pH influences for the adsorption of RR 198 onto chicken's eggshell [ES] as an adsorbent. The target adsorbent was prepared in laboratory conditions and pulverized by ASTM standard sieves. Surface characteristics and measurement of the adsorbent surface area was carried out with Scanning electronic microscope [SEM] and via N2 gas adsorption with Brunauer-Emmett-Teller isotherm. The maximum absorption wave length of this dye [lamda-max] was determined by spectrophotometer [Optima SP-3000 Plus]. Analysis of absorption spectra showed that the lamda-max of RR198 is 518 nm. The results show the Calcium components are the main constituent of ES with 1.2 m[2]/g. Elevation of the ES dose [2 to3 g] lead to increasing of dye removal from 80% to 92%. The results show that elevation of pH from 4 to 10 would lead to increasing of RR 198 adsorption from 44% to 64% but increasing of preliminary dye concentration would lead to decreasing of dye adsorption from 72% to 23%. The kinetic studies revealed that the adsorption of RR 198 is rapid and complying with second-order kinetic [R2=0.995] which the kinetic constant is 0.0004min-1. Eggshell is a cheap adsorbent that can be used for the removal of dye components from alkaline solutions