EJMP&EP





Preliminary studies in removing methylene blue, crystal violet and methyl green from aqueous solution by acid-treated sepiolite

 
J.Q. Liu1, D. Jia2,*, S.B. Zhang2, P.P. Shi2 and F. Bi2

1 School of Municipal and Environmental Engineering, Harbin Institute of Technology,
Harbin, 150090, P.R. China
2 Department of Municipal and Environmental Engineering, Tianjin Institute of Urban Construction, Tianjin, 300384, P.R. China


Accepted




ABSTRACT

The adsorption processes of methylene blue, crystal violet and methyl green from aqueous solution at 25oC, on acid-treated sepiolite have been studied by using batch experiments. Results showed that these three dyes can be adsorbed into or onto sepiolite effectively, and time required reaching equilibrium of methylene blue is about 60h, while crystal violet and methyl green are all nearly 72h. With regard to the kinetic study, the highest value of the rate constant corresponding to crystal violet and the lowest one to methyl green. The adsorption isotherms may be classified as L-type (Giles Classification). The maximum amounts of these three dyes adsorbed range from 1.29010-3mol/g for methyl green up to 6.28310-3 mol/g for crystal violet.





Keywords: Sepiolite, Methylene blue, Crystal violate, Methyl green, Adsorption


* Corresponding author
   E-mail : Jia_di @eyou.com