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

Abstract

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 ΔH°, ΔS°, and ΔG° were calculated from the slope and intercept of the linear plots of ln 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.

ESTUDIO DE LA ADSORCIÓN DE ION Mg (II) EN SUELOS DE CULTIVO DEL SECTOR YUCUMO-SAN BORJA DEL DEPARTAMENTO DEL BENI, BOLIVIA

“…Esto es debido a que el número de centros activos disponibles en la monocapa para la adsorción de nuevas moléculas es cada vez menor. Esto se produce hasta alcanzar una meseta cuando el sólido ya no puede retener más adsorbato [14][15][16].…”

Adsorption isotherm and kinetic studies for the decolorization of sunset yellow FCF dye using economically feasible low cost adsorbent

“…The peels of Punica granatum L. were found to adsorb 98.07 %of Pb (II) ions and 94.76 % of Acid Blue 40 from industrial wastewaters. Rhodamine B and Methylene Blue were removed using digested fruit waste [Hussain et al, 2016;Bhatnagar, Amit et al, 2009].…”

Synthesis of ZnO Nanoparticles by Using <em>Rosmarinus officinalis</em> Extract and Their Application for Methylene Bleu and Crystal Violet Dyes Degradation under Sunlight Irradiation

“…Il should be mentioned that without appropriate treatments, these dyes can remain in the natural water for a long time [12]. This is why various physical methods such as adsorption [13,14], coagulation [15,16], biodegradation [17,18], and various chemical methods such as chlorination, ozonation, etc. [19] have been used to reduce the environmental effects of dyes.…”