Atriplex canescens | An-Najah Staff

Removal of Cadmium from Contaminated Waters Using Saltbush (Atriplex Canescens) Biomass: Identification of Cd Binding Sites

Tue, 2015-02-10 10:55 — Maather Sawalha

Journal Title, Volume, Page:

International Journal of Environment and Pollution, Volume 34, Pages 28-42

Year of Publication:

2008

Link:

http://inderscience.metapress.com/content/8381j038543013qk

Authors:

Maather F. Sawalha

Environmental Science and Engineering PhD Program, University of Texas at El Paso, El Paso, 79968 TX, USA

Current Affiliation:

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

[email protected]

Jose R. Peralta-Videa

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jason G. Parsons

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jorge H. Gonzalez

Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Jorge L. Gardea-Torresdey

Environmental Science and Engineering PhD Program, and Chemistry Department, University of Texas at El Paso, El Paso, 79968 TX, USA

Preferred Abstract (Original):

The effect of pH on Cd(II) binding capacity of saltbush biomass was determined. Metal quantification performed using ICP/OES showed that Cd binding increased as pH increased from 2.0 to 5.0. The highest percentage of Cd bound ranged from 74-81%, 22-40%, and 70-80% for the native, esterified, and hydrolysed biomass. XAS studies showed that cadmium was present as Cd(II) and oxygen was the nearest neighbouring atom with bond lengths of approximately 2.3 Å and coordination numbers ranging between 4 and 5. Results indicated that carboxyl groups may be the primary ligand involved in the Cd binding by saltbush biomass.

Sorption of Hazardous Metals From Single and Multi-Element Solutions by Saltbush Biomass In Batch and ‎Continuous Mode: Interference of Calcium and ‎Magnesium in Batch Mode

Mon, 2015-02-09 12:19 — Maather Sawalha

Journal Title, Volume, Page:

Journal of Environmental Management Volume 90, Issue 2, Pages 1213–1218

Year of Publication:

2009

Link:

http://www.sciencedirect.com/science/article/pii/S0301479708001564

Authors:

Maather F. Sawalha

Environmental Science and Engineering Ph.D. Program, University of Texas at El Paso, 500 West University Avenue, El Paso, TX 79968, USA

Current Affiliation:

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

[email protected]

Jose R. Peralta-Videa

Chemistry Department, University of Texas at El Paso, El Paso, TX 79968, USA

Blanca Sanchez-Salcido

Chemistry Department, University of Texas at El Paso, El Paso, TX 79968, USA

Jorge L. Gardea-Torresdey

Chemistry Department, University of Texas at El Paso, El Paso, TX 79968, USA

Preferred Abstract (Original):

Batch studies were performed to determine the interference of calcium (Ca) and magnesium (Mg) on the sorption of Cu(II), Cd(II), Cr(III), Cr(VI), Pb(II), and Zn(II) [from CuSO₄, K₂Cr₂O₇, Pb(NO₃)₂, Cr(NO₃)₃, ZnCl₂, and Cd(NO₃)₂] by saltbush (Atriplex canescens) biomass. The results demonstrated that Ca and Mg at concentrations of at least 20 times higher than the concentration of most of the target metals did not interfere with the metal binding. The data show that the batch binding capacity from a multimetal solution at pH 5.0 was (μmol/g) about 260 for Cr(III) and Pb, and about 117, 54, and 49 for Cu, Zn, and Cd, respectively. The use of 0.1 M HCl allowed the recovery of 85–100% of the bound Cu, Cr(III), and Pb, and more than 37% of the bound Cd and Zn. The column binding capacity for Pb was about 49 μmol/g from both the single and multimetal solutions, while it was, respectively about 35 and 23 μmol/g for Cr(III). The binding capacity for Cu and Zn from the single and multimetal column experiments was 35 μmol/g and less than 10 μmol/g, respectively. The stripping data from the single column experiment showed that 0.1 M HCl allowed the recovery of all the bound Cu and Zn, 90% and 74% of the bound Pb and Cr(VI), respectively, and less than 25% of the bound Cd and Cr(III), while the stripping from the multimetal experiment showed that 0.1 M HCl allowed the recovery of all the bound Cu and about 74%, 54%, 43%, and 40% of the bound Pb, Zn, Cd, and Cr(III), respectively.