Removal of Organic Dye from Artificially Contaminated Water System with Different Low Cost Naturally Available Bio-adsorbents

Abstract

The removal of organic dye (methylene blue) with naturally available low cost bio-adsorbents (water hyacinth, sawdust, duckweed,
bindweed) from artificially contaminated water has studied with different experimental conditions (particle size, amount of adsorbents,
adsorption time, concentrations of methylene blue, and pH). UV-visible spectrophotometer was used to determine the concentrations of
methylene blue (MB). The removal efficiency of methylene blue in percentage increases with the particle size of the adsorbents. The
adsorption equilibrium time for methylene blue surface is about 40 minutes. The percentage of adsorption increases with of the amount of
adsorbents, and observes maximum at 100mg with 75 mgL-1 MB concentration. The removal efficiency (%) decreases with the increasing
concentrations of methylene blue. Whereas, the removal efficiency (%) increases with the increasing of the pH up to 7 and remains almost
constant between 7 and 11. Overall, the removal efficiency of these bio-adsorbents follows the sequence: water hyacinth > sawdust >
bindweed > duckweed.