Attenuation of Methylene Blue From Aqua-media on Acid Activated Montmorillonite of Nigerian Origin

Abstract

This study evaluated the performance of an Unmodified Ugwuoba-montmorillonite Clay (UUC) and the Acid Modified Ugwuoba-montmorillonite Clay (AMUC) of Nigerian origin as low-cost materials for attenuation of Methylene Blue (MB). Batch sorption methodology was applied in adsorption and desorption studies. AMUC was found to have higher adsorption of MB than UUC under all experimental conditions. Optimum experimental conditions were achieved at pH 8.0, adsorbent particle size 100 μm, MB concentration 200 mg/L and contact time of 60 and 90 min for AMUC and UUC, respectively. Equilibrium isotherm analysis was performed by the application of the Langmuir, Freundlich, Flory-Huggins, Tempkin, Dubinin-Radushkevich and Scatchard isotherm models. The Langmuir isotherm was found to be applicable (R2of 0.999) in the sorption of MB on UUC while the Freundlich gave the best fit (R2 of 0.990) for AMUC. Kinetic analysis was evaluated by the Pseudo First Order (PFO), Pseudo Second Order (PSO), Elovich, Bangham, Intraparticle diffusion and liquid film diffusion models. The PSO model was found to be applicable in the kinetics with an initial sorption rate of 0.647 and 1.477mg g-1 min-1 for the respective adsorbents. Thermodynamics revealed a spontaneous, feasible and exothermic adsorption process, while desorption studies showed a physical adsorption mechanism.

Synthesis and Characterization of Mesoporous Aluminum Silicate and Its Adsorption for Pb (II) Ions and Methylene Blue in Aqueous Solution

“…Table 3 represents the particle size of the synthesized aluminum silicate powder with different ammonia contents. As shown in Table 3 , the mean particle sizes of all powder were ranged between 10 and 30 μm, which is a suitable particle size as the adsorbent [ 26 , 27 ]. Particularly, the mean particle size of the AS-0 was a low value of around 12.76 μm compared to the aluminum silicate powder synthesized with two-step sol-gel method.…”

Adsorption of nortriptyline antidepressant from contaminated water by emerging aluminium-based dicarboxylate metal-organic-frameworks

“…The kinetics of nortriptyline removal onto the MOFs was analyzed by the pseudo-first-order (PFO), pseudo second order (PSO), Elovich (EL), intraparticle diffusion (ID) and film diffusion kinetic equations [5]. The PFO equation is expressed as:…”

Adsorption mechanism and modeling of radionuclides and heavy metals onto ZnO nanoparticles: a review

“…Many researchers over the years have attributed the best fit of the pseudo-second-order model to the chemisorption mechanism (Liu et al 2022). Such a conclusion based on the best fit of the pseudo-secondorder model alone is not recommended as this model always presents a good fit to this kinetic adsorption data irrespective of the nature of adsorption or the rate-controlling mechanism (Simonin 2016;Akpomie et al 2017).…”