Date of Publication

5-2001

Document Type

Master's Thesis

Degree Name

Master of Science in Chemistry

Subject Categories

Chemistry

College

College of Science

Department/Unit

Chemistry

Thesis Adviser

Clovia Isabel Z. Holdsworth

Defense Panel Chair

Anamy Ma. C. Paano

Defense Panel Member

Jaime Raul O. Janairo
Adora S. Pili

Abstract/Summary

Previous studies have indicated that the iota- and the kappa- types of carrageenans are capable of binding with Pb, Cd and Zn ions and that the iota-carrageenan exhibits a higher metal binding capacity. The good metal sorbing property of iota-carrageenan suggests its possible participation in the removal of heavy metals in water, wastewater, soil samples and others. However, the potential application of iota-carrageenan for environmental remediation depends on the understanding of the mechanism involved.This study deduces the mechanism involved on the binding of iota-carrageenan towards Pb, Cd and Zn metal ions. Electrostatic attraction and ion exchange predominate, consistent with the BM0.5 or B2M complex model. K and Na ions are significantly displaced by Pb, Cd and Zn ions. Results also show preferential binding of Ca2+ by iota-carrageenan. Comparison of the exchange capacity status, sulfate content and the metal binding capacity of iota-carrageenan indicates that other binding mechanisms also exist in high molecular weight iota-carrageenan.The binding capacity of iota-carrageenan has also been observed to decrease with a decrease on its molecular weight.The iota-carrageenan was found to preferentially sorb Fe3+, Ni3+, Al3+, Si4+, and Ca2+ in naturally contaminated soil samples. Pb, Cd and Zn ions, present in trace amounts, were not bound.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

TG03203

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

ix, 80 leaves

Keywords

Metals; Metal ions; Chondrus crispus; Metal bonding; Ion exchange

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