Removal of heavy metals by adsorption using activated carbon and kao linite

Dissertant

al-Najjar, Janan Abd al-Karim Abd al-Razzaq

University

University of Technology

Faculty

-

Department

Department of Chemical Engineering

University Country

Iraq

Degree

Ph.D.

Degree Date

2009

English Abstract

The sing component adsorption of heavy metal ions named Leadoff), Copper]) Chromhm (m) and Cobalt (II) onto gummer activated carbon (GAC) for™ water aqueous sound has been ! vestige (some Bache mathematical model was developed to simulate the experimental data.

In batch experiment the effects of GAC doses, pH of solution and contact time were studied.

The results show that the percent removal of metal inns increases who ureases in mc GAC dose, pH and contact time.

The optimum values of GAC doses found were 0.1, 0.2, 0.5 and 1.8g GAC / 10 ml solution for Pb (ll), CU (I1) Cn (TlI) and Co (II) respectively and of pH solution were 5.5, 5.4, 3.1, 6 1 for (PbQI) Cu (H), CT flu and Co (n) respectively and the contact time required to reach equilibrium was 12000, 12600, 9900 and 9600 sec.

The batch adsorbed is used to determine the equilibrium isothenns data me external mass transfer coefficient and the intraparlicle diffusivity (pore diffusivity) Adsorption isotherm of metal ions onto GAC in batch adsorbed has been detertnined and correlated with me different isotherm models.

The experimental equ, br, um isotherm data were found to be of a favorable type and fitted Langmuir isotherm mode better than the other isotherm models.

Isotherms have been used to -determine thermodynamic parameters such as enthalpy (AH") free energy {AG") and entropy (AS°) were calculated and these values show that the adsorptions of Pb (fll), Cu (II),Cr (m) and Co (II) is an exothermic.

In batch isothermal absorber the pore diffusion model has been successfully applied to the adsorption of four metals named Pb (II), Cu (II), Cr (III) and Co (H) onto actuated carbon in single component system.

The pore diffusion coefficient was estimated by matching the experimental concentration decay curve with predated concentration decay curve, which was generated by the numerical solution of the batch absorber model (pore diffusion).

In the fixed bed isothermal adsorption column, a film-pore diffusion model has been developed as a mathematical model to predict the fixed bed breakthrough curves for the four metal ions.

This model takes account of external mass transfer resistance, pore diffusion resistance as well as axial dispersion with nonlinear isotherm.

The effect of flow rate of the solution, bed height and initial concentration of solution have been studied The film-pore diffusion model provides a good description of the addiction process for adsorption of metal ions Pb (Il), Cu (Il), Cr (flll) and Co (II) onto activated carbon in fixed bed absorber.

One type of clay material was used named Kaolinite to adsorb heavy metal from aqueous solution as alternative, 0 activated carbon, since these materials am expensive and available in abundance.

The present work shows that the kaolinite used is less efficient than activated carbon.

Main Subjects

Chemistry

Topics

• Heavy minerals
• Adsorption
• Water
• Absorption

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305001