Biosorption of Colour, Copper and Zinc in Textile Wastewater using Carbonized Orange Peel

Abstract

Recently, low-cost adsorbents from sustainable sources are required for the remediation of textile wastewater. Carbonized Orange Peels  (COPs) was utilized in remediating colour, Zinc and Copper from textile wastewater. The initial and final pH, colour and trace metals’  composition of the wastewater used were determined for the adsorption processes. Batch adsorption experiment was carried out on  COPs and textile wastewater’s mixture to find effects of COP’s dosage, agitation, pH and contact time on the colour, Zinc and Copper’s  removal from the wastewater. The adsorption isotherms and kinetic studies were conducted using Langmuir, Freundlich, Pseudo-first- order and Pseudo-second-order models. Findings established that the optimum removal of colour, Zinc and Copper respectively occurred  at an adsorbent dosage of 2.5, 0.5 and 3.0 g/100ml, pH of 10, 4 and 2, rotating speed of 100, 250 and 250 rpm, contact time of  40, 60, and 40 mins. The adsorption isotherms revealed only copper adsorption as optimum and well fitted Langmuir isotherm.  Pseudosecond-order kinetic model best suited adsorption data of the colour and metal ions with high correlation coefficient (R² )  exceeding 0.95. Conclusively, COPs is effective in remediating the colour, copper and zinc from the wastewater, thus, recommended as  suitable adsorbent for treatment of textile wastewater.