1Central Tobacco Research Institute, Rajahmundry-533105, Andhra Pradesh, India
2National Institute of Research on Jute and Allied Fibre Technology, Kolkata-700040, India
*Corresponding author: iarirakesh@gmail.com
Online published on 13 May, 2016.
In search of an efficient and no-cost adsorbent for removal of methylene blue (MB) from water, cotton stem ash (CSA) was evaluated. The effect of process variables, namely, contact time, solution pH and adsorbent dose on adsorption of MB onto CSA were investigated. The adsorption kinetics and mechanism were tested with pseudo-first order and pseudo-second order model, and with intraparticle diffusion model, respectively. Based on error analysis (chi-square and percent sum of error) the suitability order of adsorption isotherms was Langmuir>Temkin>Freundlich>Jovanoic. The maximum adsorption capacity of CSA was 20.42 mg g−1. The feasibility parameter and free energy change were also calculated. The present study demonstrated that the CSA could be used as a potential, efficient, low-cost, and easily available adsorbent for the treatment of MB containing industrial wastewater.
Highlights
• For the first time, this study reported CSA as a potential, efficient and no-cost adsorbent for removal of methylene blue (MB) from water.
• Effects of different process variables were investigated and optimized.
• The maximum MB adsorption capacity of CSA was 20.42 mg g−1.
Cotton stem ash, methylene blue, adsorption kinetics, mechanism, isotherm
