Novel Silica‐Based Hybrid Adsorbents: Lead(II) Adsorption Isotherms

Abstract

Water pollution caused by the lead(II) from the spent liquor has caught much attention. The research from the theoretical model to application fundaments is of vital importance. In this study, lead(II) adsorption isotherms are investigated using a series of hybrid membranes containing mercapto groups (–SH groups) as the hybrid adsorbents. To determine the best fitting equation, the experimental data were analyzed using six two-parameter isotherm equations (i.e., Langmuir, Freundlich, Dubinin-Radushkevich (D-R), Temkin, Harkins-Jura, and Halsey isotherm models). It was found that the lead(II) adsorption on these samples followed the Freundlich, Dubinin-Radushkevich (D-R), and Halsey isotherm models. Moreover, the mean free energy of adsorption was calculated using Dubinin-Radushkevich (D-R) isotherm model and it was confirmed that the adsorption process was physical in nature. These findings are very meaningful in the removal of lead(II) ions from water using the hybrid membranes as adsorbents.

Adsorption Studies of Coconut Shell Carbons Prepared by KOH Activation for Removal of Lead(II) From Aqueous Solutions

“…The parameters of the six adsorption isotherms are listed in Table 1. A preliminary screening of the corresponding data has shown that Freundlich and Halsey isotherms fit the experimental data well due to high correlation coefficient (R 2 ), which may be attributed to the heterogeneous distribution of active sites and multilayer adsorption on coconut shell carbons [26,27]. respectively, which implies the adsorption process can be considered as the physical adsorption.…”

Equations Adsorption Isotherms for Biuret on Soils, Paper and Cortex Plant Application of the Freundlich, Langmuir, Temkin, Elovich, Flory-Huggins, Halsey, and Harkins-Jura

“…This result reveals that biuret adsorption onto paper of plant and S 3 samples are in support of the multilayer adsorption rule [20][21]. Values of constants B and A (mg·g −1 ) of H-J isotherm model (Equation (7)) were obtained from plot 1/q e 2 vs.log C e ,Value B 0.2105-0.3505, where value A(1.8181-5.0000).…”

Use of statistical expressions to evaluate the performance of two parameter adsorption isotherm models on dyes using natural adsorbents

“…The goodness of fit criterion (R 2 value) was computed by linear regression for all the dyes using all adsorbents to determine the best fit isotherm. The important two parameter isotherms applied in this study are the Freundlich, Langmuir, Temkin, Jovanovic, Halsey, Hurkins-Jura and Dubinin-Radushkevic isotherms as studied by researchers (Sampranpiboon et al, 2014;Liu et al, 2013;Neto et al, 2011). The Freundlich Isotherm Equation is given as…”