Removal of Disperse Blue 56 and Disperse Red 135 dyes from aqueous dispersions by modified montmorillonite nanoclay

Chemical Industry and Chemical Engineering Quarterly

Bahrami Hajir S.¹  Arami Mokhtar¹  Amirshahi Hosein Seyed¹  Ahmadishoar Javad¹  Movassagh Barahman² 

[1] Amirkabir University of Technology, Textile Engineering Department, Tehran, Iran;K.N. Toosi University of Technology, Chemistry Department, Tehran, Iran;

关键词: isotherm;    kinetic;    modified nanoclay;    Disperse dye;    waste water;   

DOI  :  10.2298/CICEQ150116049A

来源: DOAJ

【 摘 要 】

In this study modified montmorillonite was used as an adsorbent for the removal of two selected disperse dyes i.e., Disperse Blue 56 (DB) and Disperse Red 135 (DR) from dye dispersions. The adsorption equilibrium data of dyes adsorption were investigated by using Nernst, Freundlich and Langmuir isotherm models. The adsorption kinetics was analyzed by using different models including pseudo-first-order, pseudo-second-order, Elovich and Intraparticle diffusion model. The Freundlich isotherm was found to be the most appropriate model for describing the sorption of the dyes on modified nanoclay. The best fit to the experimental results was obtained by using the pseudo-second-order kinetic equation, which satisfactorily described the process of dye adsorption. Although different kinetic models may control the rate of the adsorption process, the results indicated that the main rate limiting step was the intraparticle diffusion. The results showed that the proposed modified montmorillonite could be used as an effective adsorbent for the removal of disperse dyes even from highly concentrated dispersions.

【 授权许可】

Unknown