Investigation of equilibrium, kinetic, thermodynamic and mechanism of Basic Blue 16 adsorption by montmorillonitic clay

Abstract

The adsorption of a cationic dye, Basic Blue 16 (BB16), by montmorillonitic clay was studied in detail. Changes in the molecular structure during adsorption were analyzed by FTIR spectroscopy. BB16 adsorption onto the clay mainly results from hydrogen bonding between OH and NH 2 groups of dye molecules and OH groups of clay and electrostatic interaction between the negatively charged clay surface and cationic dye. The montmorillonitic clay dose had an inverse effect on the adsorption performance, while the highest dye removal was 305 mg/g at pH 3.6. An increase in temperature and dye concentration positively enhanced the adsorption capacity of the montmorillonitic clay. Temperature had no effect on the adsorption at a dye concentration less than 500 mg/L, while dye adsorption was positively enhanced at elevated dye concentrations. Three-parameter equations provided higher better fitting than two-parameter equations while the Freundlich model had the highest correlation coefficient and the lowest error values with experimental data. The BB16 adsorption was well followed by pseudo-second order model and the rate of adsorption process was controlled by surface and intraparticle diffusion. Thermodynamic evaluations revealed that the adsorption process was spontaneous and endothermic, while the randomness increased during adsorption. Experimental results indicate that montmorillonitic clay from Eskisehir is a promising adsorbent for the removal of cationic dye molecules from aqueous solutions.

Interpretations about methylene blue adsorption by surface modified chitin using the statistical physics treatment

“…This type of problem creates the demand for the development of new low cost adsorbents (Isah et al 2015). In this way, different low cost adsorbents have been investigated, including, peach shells (Marković et al 2015), processed grapes (Saygılı et al 2015), chitin (Dotto et al 2015a), chitosan films (Dotto et al 2015b), Spirulina platensis , montmorillonitic clay (Günay et al 2013) and others (Salleh et al 2011). Chitin has been reported as a great potential low cost adsorbent, being a biodegradable and renewable biopolymer (Tang et al 2012).…”

Chemically modified alginate bead matrix for efficient adsorptive recovery of trypsin from fresh bovine pancreas

“…Both coefficients have been widely used to measure the fitting degree of the isothermal and kinetic model to adsorption data. 14,15 Evaluation of the performance of the purification process Finally, the obtained results were applied to the purification of Try from freshly activated bovine pancreas homogenate. 16 The recovery and the purification factor were calculated, and aliquots of samples were analyzed by sodium dodecyl sulfate (SDS) polyacrylamide gel electrophoresis (PAGE).…”

“…In the trial and error procedure, isothermal and kinetic parameters were estimated by maximizing the coefficient of determination ( R 2 ) (sum of squares) and minimizing the value of SS (least sum of squares). Both coefficients have been widely used to measure the fitting degree of the isothermal and kinetic model to adsorption data …”

Removal of anionic surfactants from wastewater by magnetic mineral sorbents

“…As is well known, sorption process is complicated and multistage therefore traditional kinetic models are not always suitable to describe complex adsorption treatment. In this regard, to describe the sorption kinetics in modern scientific literature (Günay et al, 2013;Hernandez et al, 2013;Elmoubarki et al, 2015) the kinetic model of the pseudo-first order, pseudo-second order model and diffusion Boyd-Adamson model are used, which reveal the influence of the chemical stage.…”