Adsorption Behavior and Dynamic Interactions of Anionic Acid Blue 25 on Agricultural Waste

Abstract

In this study, adsorption characteristics of a negatively charged dye, Acid Blue 25 (AB25), on pomelo pith (PP) was studied by varying the adsorption parameters, with the aim of evaluating the adsorption mechanism and establishing the role of hydrogen bonding interactions of AB25 on agricultural wastes. The kinetics, intraparticle diffusion, mechanism, and thermodynamics of the AB25 adsorption were systematically evaluated and analyzed by pseudo-first-order and pseudo-second-order kinetic models, the Weber–Morris intraparticle and Boyd mass transfer models, the Langmuir, Freundlich, Dubinin–Radushkevich, and Temkin isotherm models, and the Van’t Hoff equation. It was found that AB25 adsorption followed pseudo-second-order kinetics, governed by a two-step pore-volume intraparticle diffusion of external mass transfer of AB25 onto the PP surface. The adsorption process occurred spontaneously. The adsorption mechanism could be explained by the Langmuir isotherm model, and the maximum adsorption capacity was estimated to be 26.9 mg g−1, which is comparable to many reported adsorbents derived from agricultural wastes. Changes in the vibrational spectra of the adsorbent before and after dye adsorption suggested that AB25 molecules are bound to the PP surface via electrostatic and hydrogen bonding interactions. The results demonstrated that the use of pomelo pith, similar to other agricultural wastes, would provide a basis to design a simple energy-saving, sustainable, and cost-effective approach to remove negatively charged synthetic dyes from wastewater.

Methylparaben Adsorption onto Activated Carbon and Activated Olive Stones: Comparative Analysis of Efficiency, Equilibrium, Kinetics and Effect of Graphene-Based Nanomaterials Addition

“…As can be seen in Figure 6, the intraparticle model representations are not linear over the whole time range, with three distinct linear zones clearly distinguishable, which means that intraparticle diffusion is not the only controlling step of the adsorption rate, with more than one controlling step involved. That is, the trial nature of the intraparticle model plots confirms that both boundary layer diffusion and intraparticle diffusion control the adsorption process in both adsorbents [60][61][62].…”

“…To distinguish the main rate-controlling step of the adsorption process, the experimental kinetic data were fitted to Boyd's kinetic model. Figure 6 shows that for both adsorbents, the plots are linear but do not pass through the origin, suggesting that the adsorption processes of methylparaben on both activated carbon and activated olive stones are mainly controlled by boundary layer diffusion [60][61][62].…”

Peanut Shell as a Natural Adsorbent for the Removal of Acid Blue 25 from Aqueous Solution

“…The removal of many kinds of dyes is possible using the adsorption method, which was chosen because it is straightforward, efficient, and easy to use (Shabaan et al, 2020;Shahrin et al, 2022). Many adsorption studies were performed to ascertain the impact of contact time, preliminary dye concentration, temperature, and pH on the treatment processes of various types of dye (Dutta et al, 2021).…”

Magnetic Core@Shell Fe3O4@Polypyrrole@Sodium Dodecyl Sulfate Composite for Enhanced Selective Removal of Dyestuffs and Heavy Metal Ions from Complex Wastewater

“…In recent years, with the rapid development of industries, the sewage discharge is increasing gradually, and the water pollution problem is becoming more and more serious. − Some dyestuff and heavy metal ion sewage produced by some industries is difficult to degrade and dyestuff molecules , and heavy metal ions can exist in the natural environment for a long time. − The most important thing is that these dyestuffs and ions as carcinogens seriously affect the health of water organisms and human beings. Therefore, necessary treatment is needed before sewage is discharged. − With the development of society, the treatment of dyestuffs and heavy metal ions − in sewage has become the focus of developing modern civilized cities. − However, because the composition of dyestuffs and heavy metal ions is very complex, the degree of pigment is too high, and the influence of acid and alkali is great, it is very hard for sewage treatment at present.…”