Adsorption equilibrium and kinetics of copper ions and phenol onto modified adsorbents

Abstract

The adsorption equilibrium and kinetics of single and binary component copper ions and phenol onto powdered activated carbon (PAC), alginate beads and alginateactivated carbon beads (AAC) were studied. Adsorption equilibrium data for single component copper ions and phenol onto the adsorbents could be represented by the Langmuir equation. Multicomponent equilibrium data were correlated by the extended Langmuir and ideal adsorbed solution theory (IAST). The IAST gave the best fit to our data. The amount of copper ions adsorbed onto the AAC beads in the binary component was greater than that of phenol. The internal diffusion coefficients were determined by comparing the experimental concentration curves with those predicted from surface diffusion and pore diffusion model. AbbreviationsA S surface area of adsorbent (m 2 /g) C i initial concentration of bulk fluid (mol/m 3 ) C e saturation concentration of the adsorbate in the liquid phase (mol/m 3 ) d P particle diameter (m) D P pore diffusion coefficient (m 2 /s) D S surface diffusion coefficient (m 2 /s) k f film mass transfer coefficient (m/s) k F isotherm parameter (mol/kg)(mol/m 3 ) −1/n k L isotherm parameter (m 3 /mol) k S isotherm parameter (mol/m 3 ) −1/n N A rate of mass transfer of adsobates to the external surface of the adsorbent (mol/s) N number of component q equilibrium amount adsorbed on the adsorbent (mol/kg) q m maximum adsorption capacity of adsorbent (mol/kg) R P particle radius (m) V volume of solution (m 3 ) W weight of adsorbent (kg)

Application of a new type of Si–Al porous clay material as a solid phase support for immobilizing Acidovorax sp. PM3 to treat domestic sewage

“…Several isotherm models have been used to describe the relationship between an adsorbate and an adsorbent. The Langmuir and Freundlich isothermal adsorption equations are the most widely used isothermal adsorption equations (Kim et al., 2011). The main output of the adsorption isotherm study describes the equilibrium correlation between the concentration of adsorbate on the adsorbent and in solution as well as the distribution at adsorbent interfaces (Kausar et al., 2018).…”

Molecular mechanism of lysozyme adsorption onto chemically modified alginate guar gum matrix

“…[5][6][7]. In addition, the high adsorption capacity of small molecules, such as, heavy metals and aromatic contaminants in water, in polyelectrolyte non-soluble matrixes have been reported in previous works [8,9]. However, there are few reports on enzyme adsorption capacity onto these matrixes, especially about the potential application of these systems in the scale up of protein isolation.…”

“…To analyse the adsorption kinetics mechanism, the experimental data at different temperatures and initial concentrations of LZ were fitted with two models called, pseudo-first-order and pseudosecond-order [18,19] respectively, as shown in Eqs. ( 8) and (9).…”

High basicity adsorbents from solid residue of cellulose and synthetic polymer co-pyrolysis for phenol removal: Kinetics and mechanism

“…These models are the simplest ones but directly give information on the adsorption capacity or heterogeneity factor that allow to study the mechanism of organic compounds adsorption. The use of other equations mostly refers to the search for the equation with best fit [33,[42][43][44][45]. The calculated values of the Langmuir and Freundlich equation's parameters are given in Table 3.…”

“…The adsorption capacity obtained for CACs Langmuir is very high. The amount of phenol adsorbed on different low-cost adsorbent usually does not exceed 100 mg/g [42,46], whereas the adsorption capacity of commercial ACs or ACs obtained from waste biomass and polymers usually varies between 100 and 300 mg/g [16,20,21,28,[34][35][36][42][43][44][45][46][47][48]. The Langmuir adsorption capacity obtained for different activated carbons tested without any electrolyte addition to phenol solution is presented in Table 4.…”