Muhammad Ali Zulfikar, Edeh Dieke Mariske, and Samitha Dewi Djajanti

pp. 309 - 316

Abstract

Batch adsorption of lignosulfonates using untreated powdered eggshell under the influences of mixing time, pH,
particle size and dose of powdered eggshell was investigated. Adsorption isotherms of lignosulfonates onto powder eggshell
were also studied. Eggshells were collected from the Balubur traditional market in Bandung, Indonesia, washed with distilled
water, air dried, and then ground into powder of different particle sizes. Kinetic studies found that equilibrium time was as
high as 90 minutes. From experiments carried out at different pH, it was observed that pH plays an important role in the
adsorption of lignosulfonate compounds. It was also observed that particles size has no significant effect on the adsorption
of lignosulfonate compounds. The optimum dosage of powdered eggshell was 30 g/100 mL of 500 mg/L lignosulfonate
solution. Adsorption isotherms studied through the use of graphical methods revealed that the adsorption of lignosulfonates
onto powdered eggshell follows the Langmuir model.