Adsorption

Batch adsorption experiments Adsorption of the Pb2+ ions by the Fe3O4@GMA-AAm nanocomposite was measured from batch adsorption experiments by mixing 10 mg of adsorbent with an aqueous solution containing a predetermined concentration of Pb2+ ions (50 mL). The mixture was shaken at 200 rpm to reach equilibrium. After a specified time, the solid and liquid were separated by external magnet and the concentrations of Pb2+ ions were measured by AAS. To find the optimized pH in adsorption of Pb2+ ions…

Adsorption isotherm models : To study the proper model, the isotherm data were analyzed and were fitted them into two models, Freundlich and Langmuir, because they are the most suitable and employed models. Equilibrium uptake of CV and MB was investigated with sorbent weight of 0.5 g of fennel seeds in contact with 100 mL of solutions and at pH 4 for CV and 6 for MB. The flasks were shaken at 200 rpm and the equilibrium concentration of the remaining CV and MB was determined by spectrometer.…

Adsorption is the bond of particles, particles, or atoms from a gas, fluid, broken down and attached strongly to a surface. This procedure makes a film of the adsorbate on the surface of the adsorbent. This methodology varies from absorbtion, in which a liquid (the absorbate) pervades or is absorbed by a porous solid. Adsorption is a surface-based procedure while absorption includes the entire volume of the material. The term sorption envelops both methodologies, while desorption is the converse…

(a) Langmuir isotherm model Langmuir isotherm is based on the following assumptions: (a) each surface site can be singly occupied, (b) there are no lateral interactions between adsorbed species, (c) the enthalpy of adsorption is independent of surface coverage and (d) energy of adsorption is constant. The Langmuir isotherm is 2.5…

Tempkin isotherm contains a factor that explicitly takes into account adsorbing species-adsorbate interactions . This isotherm assumes that the heat of adsorption of all molecules in the layer decreases linearly with coverage due to adsorbate-adsorbate interaction and adsorption was characterized by a uniform distribution of binding energies, up to some maximum binding energy. Tempkin isotherm has generally been used in the linearized and rearranged form as following:…

q= 3∫_0^R▒(q_i r^2 dr)/R^3 (2) The adsorption isotherm is used to relate the concentration qs and Cs. The equilibrium adsorption at external surface (qs) is studied using two-parameter Langmuir isotherm. q_s= (Q_m K_L C_s)/(1+K_L C_s )…

experimental adsorption equilibrium data were analyzed using Langmuir, Freundlich, Temkin and D-R isotherms. The sorption data was analyzed using linear form of all the isotherm equations Models having high correlation coefficient (R2 ) values are considered best fit to represent the sorption data. The Freundlich isotherm holds for multilayer non-ideal adsorption on heterogeneous surface and is represented by the following empirical equation: qe = KF Ce 1/n Where, KF = adsorption equilibrium…

The effects of contact time, IC concentration, and temperature on adsorption were investigated. The adsorption kinetic was determined by analyzing adsorption capacity of the aqueous solution at different time intervals. 4. 1. Variation of AgNPs/functionalized silica composition The proficiency of AgNPs/ f-silica samples for the adsorptive elimination of IC from…

The thermodynamics parameters of adsorption relaxation strength (Δε) and dielectric activation (ΔF) of stearic acid complex have been calculated and the results are tabulated (3a-3f) using this formula(47) Δε = ε0 - ε∞ and ΔF = ε0 – ε’. The thermodynamic parameters of adsorption of stearic acid complex are tabulated(3a-3f). The Gibb’s free energy change of adsorption was found to be in range of -2.6 to -0.05KJ/mole. These results indicate that the adsorption of stearic acid complex is…

used as anionic dyes. The effect of adsorbent dosage, dye concentration and pH on dye removal was evaluated. Kinetic of dye adsorption followed pseudo-second order for single and binary system. The results showed that the experimental data were correlated reasonably well by Langmuir and Freundlich isotherm in single and binary system, respectively. The maximum dye adsorption capacity (Q0) was 217.3913 and 250 mg/g for DR80 and DG6, respectively. Keywords: Introduction Increasing attention has…