Safia Hassan, M. A. Ahmad, N. Irfan, M. Tufail, A. Farooq, L. Duclaux


Imidazolium and pyridinium based ionic liquids (ILs) have been separated from aqueous solutions by adsorption using a raw Chinese activated carbon (CAC), a bleached Chinese activated carbon (BAC) and an acid treated Chinese activated carbon (AAC) as adsorbent. Adsorption isotherms data of ionic liquids on activated carbons has been obtained. The influence of both cations and anions was analyzed by studying three different ILs. The role of surface chemistry of the adsorbent was also examined using activated carbons modified by oxidative treatments. The BET surface area of activated carbons was measured by nitrogen adsorption. The results of this work indicate that activated carbon is an attractive adsorbent to remove ionic liquids from water streams. It has also been demonstrated that the adsorption of hydrophilic ionic liquids can be improved by modifying the amount and nature of oxygen groups on the activated carbon surface specially by increasing basic groups. The adsorption data for isotherms was studied at acidic, neutral and basic pH values.

Full Text:



J. Ranke, S. Stolte, R. Stromann, J. Arning

and B. Jastorff, Chem. Rev. 107 (2007) 2183.

R.D. Rogers and K.R. Seddon, in: Ionic

liquids IIIB: fundamentals, progress,

challenges, and opportunities –

transformations and processes, eds. R.D.

Rogers and K.R. Seddon (American

Chemical Society, Washington (DC), 2005) v.

X. Han and D.W. Armstrong, Acc. Chem.

Res. 40 (2007) 1079.

R.D. Rogers, K.R. Seddon, in: Ionic liquids as

green solvents progress and prospects, eds

R.D. Rogers and K.R. Seddon (American

Chemical Society Washington (DC), 2003) v.

N.V. Plechkova and K.R. Seddon, Chem.

Soc. Rev. 37 (2008) 123.

A.K. Burrell, R.E. Del Sesto, S.N. Baker, T.M.

McCleskey and G.A. Baker, The large scale

synthesis of pure imidazolium and

pyrrolidinium ionic liquids, ACS symposium

series 9 (2007) 449.

L.R. Radovic, I.F. Silva, J.I. Ume, J.A.

Menéndez, C.A. Leon, Y. Leon and A.W.

Scaroni, Carbon 35, No. 9 (1997) 1339.

S.J.T. Pollard, G.D. Fowler, C.J. Sollars and

R. Perry, Sci. Total Environ. 116, Nos. 1-2

(1992) 31.

J. Palomar, J. Lemus, M.A. Gilarranz and J.J.

Rodriguez, Carbon 47, No. 7 (2009) 1846.

M. Deetlefs and K.R. Seddon, Green Chem.

(2003) 181.

D.J. Gorman-Lewis and J.B. Fein, Environ.

Sci. Technol. 38 (2004) 2491.

J.W. Shim, S.J. Park and S.K. Ryu, Carbon

(2001) 1635.


  • There are currently no refbacks.