Dynamic Studies of Binary Adsorption System in Fixed Beds using Orthogonal Collocation on Finite Element Method

Olafadehan, O. A.; Amoo, K. O.; Oyedeko, K. F. K.; Adesina, A. J.

doi:10.1007/s40819-024-01688-7

Cited by 1 publication

(1 citation statement)

References 47 publications

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“…Adsorption is a multi-phase process consisting of stages going on at different time ranges, and the rate of the process is determined by the slowest step. The effectiveness of the adsorption technique is determined by a number of factors, including the following: the properties of the adsorbent [11][12][13] and adsorbate [14][15][16], temperature [17][18][19], mixing speed [20][21][22], the presence of an accompanying substance [23][24][25], and the pH of the solution [26][27][28]. Even a seemingly small increase in the efficiency of adsorption processes used in water and sewage treatment, due to the scale and widespread use of these technologies, may mean achieving a competitive advantage over other solutions.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium and Kinetic Studies on Adsorption of Neutral and Ionic Species of Organic Adsorbates from Aqueous Solutions on Activated Carbon

Wasilewska,

Derylo-Marczewska,

Marczewski

2024

Molecules

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This work presents comprehensive studies of the adsorption of neutral and ionic forms of organic adsorbates from aqueous solutions on activated carbon. The influence of pH on the equilibrium and kinetics of the adsorption of methylene blue (MB) and organic acids, benzoic (BA), 2-nitrobenzoic (2-NBA), 3-nitrobenzoic (3-NBA), and 4-nitrobenzoic (4-NBA) acid, was investigated. Experimental adsorption isotherms were analyzed using the generalized Langmuir isotherm equation (R2 = 0.932–0.995). Adsorption rate data were studied using multiple adsorption kinetics equations, of which the multi-exponential equation gave the best fit quality (R2 − 1 = (6.3 × 10−6)–(2.1 × 10−3)). The half-time was also used to represent the effect of pH on adsorption kinetics. Strong dependences of the adsorption efficiency on the solution pH were demonstrated. In the case of organic acid adsorption, the amount and rate of this process increased with a decrease in pH. Moreover, larger adsorbed amounts of methylene blue were recorded in an alkaline environment in a relatively short time. The maximum absorbed amounts were 11.59 mmol/g, 6.57 mmol/g, 9.38 mmol/g, 2.70 mmol/g, and 0.24 mmol/g for BA, 2NBA, 3-NBA, 4-NBA, and MB. The pure activated carbon and the selected samples after adsorption were investigated using thermal analysis and X-ray photoelectron spectroscopy.

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