competing ions | An-Najah Staff

Uptake of Cadmium from Water by Beech Leaves

Tue, 2014-01-14 09:34 — Mohammed Al-Subu'

Journal Title, Volume, Page:

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology Volume 27, Issue 3, 1992

Year of Publication:

1992

Link:

http://www.tandfonline.com/doi/full/10.1080/10934529209375751

Authors:

Radi Salim

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M.M. Al‐Subu

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

E. Sahrhage

Department of Ecology, Faculty for Biology , University of Bielefeld , Bielefeld, 4800, Germany

Preferred Abstract (Original):

Uptake of cadmium from aqueous solutions by beech leaves has been studied. The effect of several factors on both rate and amount of this uptake has been studied. These factors include concentration of leaves, concentration of cadmium, pH, competing ions and drying leaves. The pattern of the curves showing the loss of cadmium from solution has been explained. Applicability of the Freündlich adsorption isotherm on the present results has been examined and the parameters of this isotherm have been calculated. The order of reaction between cadmium ions and beech leaves has been determined and a mechanism for this reaction has been suggested.

Removal of Lead from Polluted Water Using Decaying Leaves

Tue, 2014-01-14 08:40 — Mohammed Al-Subu'

Journal Title, Volume, Page:

Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology Volume 29, Issue 10, 1994

Year of Publication:

1994

Link:

http://www.tandfonline.com/doi/abs/10.1080/10934529409376166#.UtTk7LQYOrA

Authors:

Radi Salim

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

M.M. Al‐Subu

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Current Affiliation:

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

[email protected]

Sameeh Qashoa

Department of Chemistry, Faculty of Science, An-Najah National University, Nablus, Palestine

Preferred Abstract (Original):

Decaying leaves have been proven capable of partially removing lead from polluted water. Several factors affecting the removal process have been studied. These include the concentration of lead ions, concentration of leaves, drying leaves, degree of crushing of leaves, leaf extracts, pH, agitation and presence of competing and of complexing agents. The relative capability of some common types of leaves for the removal of lead from water has been studied.
The release of lead from leaves saturated with lead ions has been studied under the effect of varying pH, addition of competing ions and the addition of complexing agents.
The results of the present work indicate that the interaction between lead ions and leaves is mainly an adsorption process and fit the Freundlich adsorption isotherm whose parameters have also been calculated. A fractional order of reaction (0.7) has been determined for the reaction between lead ions and leaves using two methods of evaluation. A mechanism in which film diffusion being the most probable limiting step has been suggested.