Adsorption models for the sequestration of dye from wastewater using potatopeels as adsorbents

Abstract

This study investigated the use of locally prepared adsorbent from potato peels for the sequestration of dye (amino-phenol) from wastewater. The popular kinetic adsorption models were utilized for the assessment of the mechanisms of the adsorption process. Findings from the study showed that when the adsorbent dosage increased from 4 to 12g, adsorbed dye increased from 0.31to 0.35mg/g. Increase in contact time from 20 minutes to 120 minutes and temperature (20°C to 80°C) also increased the quantity of dye adsorbed from 0.20mg/g to 0.22mg/g and 0.23mg/g to 0.27mg/g respectively. In the same vein, increase in dye concentration from 20 mg/gto60mg/g, caused an increase in adsorption(0.21mg/g to1.32 mg/g). The Langmuir and Freundlichisotherm models fit the experimental data well with R2of 0.995 and 0.992 respectively. The constants (k1 and k2) gotten respectively from the Pseudo to first and second order kinetic models were 0.07 and 1.51.

Keywords: Potato peels, adsorption, dye, modeling