Adsorption Characteristics of Magnesium-Modified Bentonite Clay with Respect to Acid Blue 129 in Aqueous Media

作者：Hussain Sajjad; Ullah Zia; Gul Saima; Khattak Rozina; Kazmi Nida; Rehman Fozia; Khan Sabir; Ahmad Khalid; Imad Mohammad; Khan Adnan

来源：Polish Journal of Environmental Studies, 2016, 25(5): 1947-1953.

DOI：10.15244/pjoes/62272

• acid blue
• clay
• adsorption
• isotherms
• kinetics
• bentonite

Locally available bentonite clay has been modified by magnesium and used to eliminate acid blue 129 from aqueous solutions. The adsorption was studied under different experimental conditions such as dye concentrations, temperature, and shaking time. The adsorption of the dye increased with time and followed the pseudo-first-order kinetic with rate constant "k" 0.126 min(-1) at 283 K. Thermodynamic parameters such as Delta H degrees, Delta S degrees, and Delta G degrees were calculated from the slope and intercept of the linear plots of In K against 1/T. Analysis of adsorption results obtained at temperatures of 283, 293, 303, and 313 K showed that the adsorption pattern on bentonite seems to follow Langmuir and Freundlih. The increase in temperature reduces adsorption capacity by magnesium-modified bentonite due to the enhancement of the desorption step in the mechanism. The activation energy of the adsorption process was found to be 3.55 kJ mol(-1). The Mg-bentonite showed better adsorption than Ba and Al-bentonite. Our study reveals that abundantly available local clay may be used to eliminate dyes from aqueous solutions.

• 出版日期2016