Adsorptive removal of Megenta MB cold brand reactive dye by modified activated carbons derived from agricultural waste

C Parvathi

doi:10.17485/ijst/2010/v3i4.5

Abstract

The activated carbon produced from agricultural waste, Tapioca Peel, was used for the adsorption of reactive dye Megenta MB from its aqueous solutions. The preparation of activated carbon from agricultural waste could increase economic return and reduce pollution. In our project, adsorption studies were performed by varying parameters such as dye concentration, pH of the dye solution and contact time. The study investigates the removal of Megenta MB dye from its aqueous solution. The equilibrium adsorption data obtained were used to calculate the Freundlich and Langmuir isotherm parameters. Higher adsorption percentages were observed at lower concentrations of Megenta MB. Optimum pH value for dye adsorption was determined as 7. Maximum dye was removed within 120 min after the beginning for every experiment. Keywords: Tapioca peel; Megenta MB; effluent treatment, textile dye, water pollution, environment, industry, India

Highlights

Dyes are highly coloured polymers and low biodegradable in nature
After removing the outermost layer, which is in dark brownish in colour, the tapioca peel will be in a light pink or whitish in colour
A stock solution of 1000 ppm concentration dye was prepared by dissolving 1 g of megenta MB dye in 1 l of solvent and used for experimental work. 50 ml of dye solution of different initial concentrations from 0 -10 ppm in the increment of 2 ppm solution were prepared in standard measuring flasks separately, from the stock solution of megenta MB (1000 PPM) with required volume of DD water

Summary

Introduction

Dyes are highly coloured polymers and low biodegradable in nature. Colour/dye being one of the important recalcitrant, persist for long distances in flowing water, retards photosynthetic activity, inhibit the growth of aquatic biota by blocking out the sunlight and utilizing dissolved oxygen and decrease the recreation value of stream (Filipkowska et al, 2002; Filipkowska et al, 2004). The losses of reactive dyes are about 2% in the production processes and about 9% through dying and finishing operations in the textile industry. The textile dyes contribute only a small portion of the total volume of discharged waste water after the dyeing process, yet they make it deeply coloured (Balakrishnan et al, 2008). After removing the outermost layer, which is in dark brownish in colour, the tapioca peel will be in a light pink or whitish in colour. The present investigation employs the adsorption experiments of megenta MB dye on tapioca peel adsorbents under different experimental conditions. 50 ml of dye solution of different initial concentrations from 0 -10 ppm in the increment of 2 ppm solution were prepared in standard measuring flasks separately, from the stock solution of megenta MB (1000 PPM) with required volume of DD water. Results and discussions Effect of concentration (Fig.2,3) In all the batch adsorption experiments, the extent of

Percentage removal

Findings

Conclusions