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|Title:||Adsorption performance of Zr-pillared montmorillonite for the removal of organic pollutants from aqueous phase|
|Authors:||Vinod, V P|
Anirudhan, T S
|Abstract:||This study examined the effectiveness of Zr-pillared Na-rich montmorillonite (PILC) in removing humic acid (HA) and tannic acid (TA) from aqueous solutions by adsorption. Batch experiments were conducted to evaluate the pH effects, the kinetics, temperature effects and sorption isotherm on the HA and TA adsorption onto PILC. The research demonstrated that the PILC could sufficiently remove HA and TA from aqueous solutions. The most effective pH range was found to be 3.0 to 4.0 for both HA and TA. The kinetic studies showed that an equilibrium time of 6 h was needed for the adsorption of HA and TA on PILC and adsorption rates could he described by a first order Lagergren equation. The adsorption of HA and TA was found to increase with ionic strength due to the compression of diffuse double layer. The equilibrium isotherm data for both HA and TA fitted Langmuir isotherm model and based on Langmuir constants, the PILC had a greater adsorption capacity for HA than for TA. The isosteric heats of the adsorption process were determined at various surface coverages of the adsorbent. The thermodynamic parameters such as change in free energy (ΔGo), enthalpy (ΔHo), and entropy (ΔSo) were derived to predict the nature of adsorption. Sheindrof-Rebhun-Sheintuch isotherm model was used to study the competitive interaction for the adsorption of single component from mixture by PILC. About 91.4 and 94.8% of HA and TA can be recovered from the spent adsorbent by controlling the pH at 11.0.|
|ISSN:||0975-0991 (Online); 0971-457X (Print)|
|Appears in Collections:||IJCT Vol.10(2) [March 2003]|
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