Adsorption and desorption of lead (II) ions in calcium alginate extracted from Sargassum sp.

Date

10-2012

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Kristel Mae M. Rabanzo

Committee Member

Mary Grace E. Guardian Ernesto J. Del Rosario

Restrictions

Restricted: Not available to the general public and to those bound by the confidentiality agreement. Access is available only after consultation with author/thesis adviser.

Abstract

The adsorption efficiency of calcium alginate was evaluated using Pb(II) ions. Results showed that the alginate sample was found to be most efficient in adsorbing Pb(II) ions at pH 5. It was also observed that the reaction reached equilibrium after 10mins. Potentiometric titration of the alginate sample showed that the mannuronic and guluronic acids were the groups responsible for the adsorption of the Pb(II) ions. This was further evidenced by the appearance of inflection point between pH 3.0-3.8 which includes the pK values of mannuronic and guluronic acids. FT-IR analysis revealed that the ?OH group as well as the carboxylate group of the mannuronic and guluropnic acid were directly involved in the adsorption of Pb(II) ions. Furthermore, flow-through column adsorption of Pb(II) ions into the alginate sample showed that as the flowrate decreases, the metal uptake increases. The optimum metal inlet flowrate was found to be 20ml/min. Using the optimum flowrate, adsorption efficiency of the alginate was determined using actual lead wastewater from used car battery. It was observed that the maximum metal uptake for the lead wastewater was 22.1 mg metal/g sample. Desorption process was also carried out and results showed that EDTA have higher percent desorption (16.20 ± 0.07) than calcium chloride solution (0.82 ± 0.59).

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2012 C4 R33

Document Type

Thesis

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