Color removal from textile effluent using Azadirachta indica leaf powder as an adsorbent
Sustainable process-product development & green chemistry
Sustainable & Clean Technologies-I: Extraction & Remediation (T1-4P)
Keywords: reactive dye, Azadirachta indica, Neem, Remazol Blue RR, dye removal
The removal of dyes present in industrial effluent has received great attention in the last few years. It is due to the increase of awareness and rigidity of the environmental rules. Adsorption is one of the techniques that has been used with success for the effective removal of dyes. However, the efficiency of the adsorption process depends on the choice of a proper adsorbent. Because of the high cost of some conventional adsorbents, researches have been directed to the use of alternative adsorbent, such as the Neem tree leaves. The Neem tree (Azadirachta indica) is native from India and its importance has been recognized by the US National Academy of Sciences, which published a report in 1992 entitled “Neem – a tree for solving global problems”. The aim of the present work was to investigate the use of Neem leaves as an alternative adsorbent for the removal of dyes present in the textile effluent. The dyestuff studied was the reactive dye Remazol Blue RR. In order to get the best removal condition for this dye, it was verified the influence of the following parameters: aqueous solution pH, agitation, addition of sodium sulfate, temperature of mixture and adsorbent particle size. The best conditions obtained for the adsorption of reactive dye Remazol Blue RR were used for the adsorption of the acid dye Lanaset Blue 2R and for the basic dye Maxilon Blue GRL in order to verify the efficiency of the adsorbent for different dye classes. Spectrofotometry was the technique used to measure the concentration of the dye remained in the fluid phase after the adsorption process using Neem tree leaves. The Langmuir, Freundlich and Radke & Prausnitz models were used to adjust the experimental data of changes in the concentration of the solute adsorbed on the solid phase (adsorbent) according to the equilibrium concentration of the fluid phase and showed good correlation. According to the experimental data, the removal of Maxilon Blue GRL using Neem tree leaves as an alternative adsorbent was superior to 99%. For the dyes Lanaset Blue 2R and Remazol Blue RR the removal was approximately 97% and 90%, respectively. Therefore, the removal of dyes present in textile effluent using Neem tree leaves as adsorbent showed great results, which could be used in industry as an alternative for the treatment of textile discarding.
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Presented Monday 17, 13:30 to 15:00, in session Sustainable & Clean technologies - I: Extraction-Remediation (T1-4P).
