Adsorptive removal of methylene blue as organic pollutant by marble dust as eco-friendly sorbent

Inexpensive and eco-friendly sorbent, marble dust, has been successfully utilized for the removal of some organic pollutants from aqueous solutions. The excessive release of organics into the environment is a major concern worldwide. Therefore, adsorption of methylene blue (MB), as an organic pollutant, onto low cost adsorbent from aqueous solutions was investigated. The adsorption of MB can be approximated more favorably by the pseudo-second-order model. Langmuir isotherm is applicable, the monolayer capacity was found to be 16.36 mg/g. The thermodynamic parameters were also determined. The obtained results indicated that, sorption was found to be rapid, 98% within 10 min. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.