Evaluation of Adsorption Capacity of Methylene Blue in Aqueous Medium by Two Adsorbents: The Raw Hull of <i>Lophira Lanceolata</i> and Its Activated Carbon

Abstract

Abstract:The purpose of this study is to evaluate the adsorption capacity of two adsorbents from the lignocellulosic residues of Lophira Lanceolata. The raw hull of Lophira Lanceolata and its activated carbon produced by chemical activation with orthophosphoric acid (H 3 PO 4 ) at 50% (Vacid/V water ) of the said hull. The ratio of impregnation to orthophosphoric acid used is 4.5. Activation and carbonization were carried out at 400°C. The physicochemical properties of the prepared activated carbon were determined and methylene blue adsorption tests were performed. On the basis of the results obtained, the iodine test revealed that the activated carbon produced had a microporosity of 646.81 mg/g, a density of 0.3156, a moisture content of less than 15% and ash content equal to 2%. Regarding the adsorption, results showed that methylene blue (100 ppm) adsorbed more easily on the activated carbon produced than on the crude residues with respective contact time of 10 minutes and 40 minutes. The removal rate was of the order of 100% for the activated carbon and of 83.56% for the raw hulls. Furthermore, an influence of the mass of the support, of the initial concentration and of the pH on the kinetics and on the adsorption capacity was observed. Kinetics obeyed to the pseudo-second order model; the diffusion was intra-particular and the Freundlich and Langmuir models satisfactorily described the adsorption of methylene blue respectively on the crude residues and on the produced activated carbon.

Adsorption of Methylene Blue Onto Activated Carbon Developed From Baobab Fruit Shell by Chemical Activation: Kinetic Equilibrium Studies

“…Generally, the equilibrium was achieved within approximately the first hour of adsorption, indicating a favorable interaction between the methylene blue dye and BFS-ACs. These results were similar to those reported by some previous studies [8,15,25,46].…”

“…In order to minimize this dye's impacts on the environment, many technologies have been developed to treat wastewater such as flocculation, coagulation, ozonation, chlorination, anodic oxidation, and electrooxidation. However, these techniques are costly and frequently become secondary sources of pollution [8]. Many studies revealed that adsorption by solid adsorbents presents the advantages of high efficiency, simple design, and low initial costs [7].…”

Preparation and characterization of a new adsorbent from raphia taedigera seed

“…The effect of adsorbent dosage on Methylene blue was determined at room temperature (298 K), adsorbent concentration (100 mg/L) and time (15 minutes). The result, as presented in Figure 11 showed an increase in adsorption as the dosage increases [58,59,60] up to 0.7 g. The increase may be due to the availability of a larger active surface area [61] and pore size. Maximum adsorptions of 99.207% and 89.997% were observed at 0.7 g for RTA and RTB respectively.…”

Nonlinear Fitting for Estimation of Adsorption Equilibrium, Kinetic and Thermodynamic Parameters of Methylene Blue onto Activated Carbon

“…The cleaned charcoal sample was dried at 105 °C and subsequently activated at 250 °C for 24 h in an oven, then allowed to cool in the desiccator. The dried sample was powdered and sieved using different micrometers aperture sieve sizes (29,30).…”