Triarylmethane dyes have been identified as one of the toxic dyes. The presence of triarylmethane dyes in water act as pollutant and cause
hazardous effect on natural resources, aquatic life as well as to human being. Triarylmethane dyes are extensively used for wool, silk,
cotton, leather and paper industries. In the present work, natural sand has been utilised as an adsorbent for developing methodology for the
removal of these dyes, which does not easily biodegrades in aqueous medium. The adsorption efficiency of natural sand was tested by using
Victoria Blue (VB) as model dye. The adsorpion behaviour as a function of the pH of the aqueous dye solution, the contact time, initial
concentration of the dye and the amount of adsorbent was studied. All studies were performed at room temperature (298 K). It was
observed that under optimized conditions, 91 % of VB can be removed from aqueous media. The adsorption data was fitted well by the
Langmuir and Freundlich adsorption isotherm; pseudo-second-order and intraparticle diffusion models were also applied.
Key words: Victoria blue; natural sand, adsorption isotherm and kinetics.
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