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Adsorption of copper on rubber (Hevea brasiliensis) leaf powder: Kinetic, equilibrium and thermodynamic studies

Paper ID Volume ID Publish Year Pages File Format Full-Text
4439 226 2008 10 PDF Available
Title
Adsorption of copper on rubber (Hevea brasiliensis) leaf powder: Kinetic, equilibrium and thermodynamic studies
Abstract

The adsorption of Cu(II) ions from aqueous solution by rubber (Hevea brasiliensis) leaf powder (RHBL) was studied in a batch adsorption system. Characteristics of RHBL such as pH of aqueous slurry, pH of zero point charge (pHZPC), surface area and pore diameter, Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS) were investigated. Factors influencing adsorption such as pH of the solution, adsorbent dosage, particle size, copper concentration and temperature have been studied. The adsorption process was relatively fast and equilibrium was achieved after about 60 min. Maximum adsorption of Cu(II) ions occurred at around pH 4–5. The kinetic data were analyzed using various kinetic models particularly pseudo-first-order, pseudo-second-order, Ritchie's-second-order and intraparticle diffusion. The pseudo-second-order kinetic model was found to agree well with the experimental data. Adsorption equilibrium data could also be described well by Langmuir, Freundlich and Dubinin–Radushkevich isotherm models. Based on the Langmuir isotherm, the monolayer adsorption capacity of Cu(II) ions was 8.92 mg g−1. Thermodynamic parameters such as enthalpy change (ΔH°), free energy change (ΔG°) and entropy change (ΔS°) were calculated and adsorption process was spontaneous and exothermic. Copper removal by RHBL involved different kinds of mechanisms such as ion-exchange, complexation and physisorption.

Keywords
Adsorption; Copper; Rubber leaf powder; Kinetic; Isotherms; Thermodynamic
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Adsorption of copper on rubber (Hevea brasiliensis) leaf powder: Kinetic, equilibrium and thermodynamic studies
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 39, Issue 3, 1 May 2008, Pages 521–530
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us