Adsorption Performance of La(III) and Y(III) on Orange Peel: Impact of Experimental Variables, Isotherms, and Kinetics

Abstract

To alleviate the environmental problem associated with rare earth wastewater, this research applied waste orange peel (OP) for the adsorption of La(III) and Y(III) from aqueous solution. The adsorption properties of orange peel are characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), and the participation of hydroxyl and other oxygen-containing groups that promote the physical-chemical interaction is verified. Batch adsorption results suggest that orange peel possesses a satisfactory adsorption performance for La(III) and Y(III). The optimal adsorption conditions were obtained at pH of 6, temperature of 40°C, appropriate dosage of 2 g/L and 3 g/L, contact time of 30 min, and initial ion concentration of 32 mg/L. Under the same condition, adsorption performance of La(III) is better than that of Y(III). The experimental data is well fitted by the Langmuir isotherm model with correlation coefficient R 2 > 0.9 and the minimum standard error values. Equilibrium results show that Langmuir monolayer adsorption capacity of La(III) and Y(III) onto orange peel is up to 37.61 and 31.10 mg/g. The fitting results of kinetics prove that the adsorption process of La(III) and Y(III) follows the pseudosecond-order model. Thus, natural orange peel as a recyclable biosorbent has potential economic and applicative benefits to remove La(III) and Y(III) from aqueous solutions.

A Statistical Modeling and Optimization for Cr(VI) Adsorption from Aqueous Media via Teff Straw-Based Activated Carbon: Isotherm, Kinetics, and Thermodynamic Studies

“…The Langmuir model was founded on the postulation that the highest adsorption happens as soon as enough monolayer of solute particles exists on the adsorbent surface, keeping constant the adsorption energy, which means identical over all areas and there is not any migration of absorbable particles in the plane of the surface [46]. These are comparably better models of isotherm in explaining the adsorption of chemicals [46]. The Langmuir isotherm is given by the following equation: (12) C e q e = 1 b q max + C e q max . …”

“…The well-known isotherm models, that is, Langmuir and Freundlich, were utilized in order to understand the adsorbate particle distribution between the adsorbent and the liquid, grounding on numerous assumptions which are mostly associated with the adsorbent homogeneity or heterogeneity, the type interaction possibility, and coverage among the particles of the adsorbate [13]. The Langmuir model was founded on the postulation that the highest adsorption happens as soon as enough monolayer of solute particles exists on the adsorbent surface, keeping constant the adsorption energy, which means identical over all areas and there is not any migration of absorbable particles in the plane of the surface [46]. These are comparably better models of isotherm in explaining the adsorption of chemicals [46].…”

Simultaneous Adsorption of Multicomponent Lanthanide Ions on Pectin Encapsulated Zeolite A

“…Table 3 shows adsorption of lanthanides on different reported adsorbents, as a comprehensive comparison. It is interesting to note that, similar to other adsorbents derived from agricultural wastes 2,[29][30][31] , magnetic nano-particles 32) , and activated carbon 33) , and biopolymers 34) , P-ZA composite is also capable to adsorb multicomponent REE ions. This suggests that P-ZA composite has the potential to be utilized as an adsorbent for the initial step of separation and purification of lanthanides after leaching them from the metallurgical ores.…”

Mesoscopic Process Simulation of In Situ Leaching of Ionic Rare Earth Based on NMRI Technology

“…Ion-adsorbed rare earth minerals are mainly distributed in the south of China and are named for rare earth elements adsorbed in the form of cations on the surface of clay minerals weathered by granite or volcanic rocks. They are unique and important rare earth minerals in China [1, 2]. Rare earth cations adsorbed on the surface of clay minerals undergo ion exchange reaction in strong electrolyte solution and enter the solution [3].…”