Efficiency of the processed walnut shell in removal of red reactive 2 dye from aqueous solutions

Red reactive 2 dyes are colors which have many uses in textial industries the aim of this study is to eualuvate the efficiency of the processed walnut shell in the removal of red reactive 2 dye from aqueous solutions.
This study is an experimental type. Powder and granule walnut shell and red reactive 2 dyes have been used in different concentrations.
Findings: The adsorption rate was affected by adsorbent rate and expose time. By increase of adsorbent rate from 0.5 to 2 g in 100ml, the adsorption rate increased from 50% to 96%. The maximum adsorption rate occurred in the first 10 min. Dye adsorption rate was adopted according to Langmuir isotherm adsorption.
The comparisons indicate that the adsorption rate is much better in powder type than in granule type. Considering the acidic characterization of some dyes and high temperature of most of the industrial effluents, it is concluded that walnut shell can be used as dye sorbent in such wastewater.