nanoadsorbent | An-Najah Staff

Kinetics, Equilibrium and Thermodynamic Studies on the Adsorptive Removal of Nickel, Cadmium ‎and Cobalt from Wastewater by Superparamagnetic Iron Oxide Nanoadsorbents

Mon, 2014-05-19 10:52 — Nashaat N. Nassar

Journal Title, Volume, Page:

The Canadian Journal of Chemical Engineering Volume 90, Issue 5, pages 1231–1238

Year of Publication:

2012

Link:

http://onlinelibrary.wiley.com/doi/10.1002/cjce.20613/abstract

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada, T2N 1N4

Current Affiliation:

Department of Chemical Engineering, Faculty of Engineering and Information Technology, An-Najah National University, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

Because of its unique properties, such as specific functionality and large specific surface area, iron oxide nanoadsorbents had showed potential for energy and environmental applications. This work investigated the adsorptive removal of different metal ions from wastewater by superparamagnetic iron oxide nanoadsorbents (Fe₃O₄). Batch-adsorption technique was employed to assess the kinetic behaviour and adsorption equilibrium of cadmium, cobalt and nickel. Accordingly, the effect of the following variables on the adsorption reaction was tested, namely: solution pH, contact time and temperature. Metal ion adsorption was found to be highly pH dependent with a maximum uptake achieved around pH 5.5. Kinetic studies showed that adsorption was fast and equilibrium was achieved in less than 60 min. The external mass transfer kinetic model was applied to the experimental results and provided reasonable overall volumetric mass transfer coefficients. Adsorption isotherms were determined and appropriately described by the Freundlich and Langmuir models, with a better fit to the Freundlich model. The amount of metal ion adsorbed increased as the temperature increased, suggesting an endothermic adsorption process. The thermodynamics studies indicated that the adsorption process was spontaneous and endothermic in nature. © 2011 Canadian Society for Chemical Engineering

Rapid Removal And Recovery Of Pb(II) From Wastewater By Magnetic Nanoadsorbents

Tue, 2011-05-17 08:12 — Nashaat N. Nassar

Journal Title, Volume, Page:

Journal of Hazardous Materials, 184 (1-3), 538-546

Year of Publication:

2010

Link:

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TGF-50W1TM1-8&_user=1...

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine

[email protected]

Preferred Abstract (Original):

Iron oxide nanoadsorbents are cost-effective adsorbents that provide high adsorption capacity, rapid adsorption rate and simple separation and regeneration. In this study, Fe3O4 nanoadsorbents have been employed for the removal of Pb(II) ions from aqueous solutions by a batch-adsorption technique. The effects of contact time, initial concentration of Pb(II) ions, temperature, solution pH and coexisting ions on the amount of Pb(II) adsorbed have been investigated. Pb(II) adsorption was fast, and equilibrium was achieved within 30 min. The amount of Pb(II) adsorbed increased as temperature increased, suggesting an endothermic adsorption. The optimal pH value for Pb(II) adsorption was around 5.5. Furthermore, the addition of coexisting cations such as Ca2+, Ni2+, Co2+, and Cd2+ has no remarkable influence on Pb(II) removal efficiency. The adsorption equilibrium data fitted very well to Langmuir and Freundlich adsorption isotherm models. The thermodynamics of Pb(II) adsorption onto the Fe3O4 nanoadsorbents indicated that the adsorption was spontaneous, endothermic and physical in nature. The desorption and regeneration studies have proven that Fe3O4 nanoadsorbents can be employed repeatedly without impacting its adsorption capacity.

Kinetic, Mechanistic, Equilibrium And Thermodynamic Studies On The Adsorption Of Acid Red Dye From Wastewater By Fe2O3 Nanoadsorbents

Thu, 2010-05-27 10:00 — Nashaat N. Nassar

Journal Title, Volume, Page:

Separation Science And Technology Volume 45, Issue 8, 1-12, 2010

Year of Publication:

2010

Link:

http://www.informaworld.com/smpp/content~db=all~content=a921994369~frm=titlelink

Authors:

Nashaat N. Nassar

Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, Alberta, Canada

Current Affiliation:

Department of Chemical Engineering, An-Najah National University, P.O. Box 7, Nablus, Palestine

Preferred Abstract (Original):

The presence of dyestuffs in wastewater poses an environmental concern since these organic contaminants are toxic to aquatic and non-aquatic life. In addition, these contaminants are difficult to remove or biodegrade, which poses a challenge to the conventional wastewater treatment techniques. In this work, the adsorption of acid red dye 27 (AR27) onto γ-Fe₂O₃ nanoadsorbents was studied for the removal of red dye from aqueous solutions by the batch-adsorption technique. The experiments were carried out at different conditions of contact time, initial AR27 concentration, temperature, co-existing ions, and solution pH. It was found that the adsorption was a rapid process, and equilibrium was achieved in less than 4 minutes. The removal of AR27 decreased with the increase in solution pH and temperature. Furthermore, the addition of chloride and nitrate anions has no remarkable influence on AR27 removal efficiency. On the other hand, the effects of sulfate and bicarbonate anions on the removal of AR27 were significant. The adsorption equilibrium data fitted very well using Langmuir and Freundlich adsorption isotherm models. The data obtained from adsorption isotherms at different temperatures were used to calculate thermodynamic quantities of adsorption, such as standard Gibbs free energy change, enthalpy change , and entropy change . The adsorption process was found to be spontaneous, exothermic and physical in nature. The results indicate that γ-Fe₂O₃ nanoadsorbents could be employed for the removal of dyes from wastewater.