Determination of Ion exchange capacity of coconut "Sapal" and its modified forms

Date

10-1995

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Myrna S. Rodriguez

Abstract

SOLIJON, ANNALITA PACAOA. College of Arts and Sciences. University of the Philippines at Los Banos. October, 1995. Determination of Ion Exchange Capacity of Sapal and its Modified Forms.

Adviser : Myrna S. Rodriguez , Ph. D.

Coconut meat residue or "sapal" was treated with sulfuric acid at various concentrations at 1005C for thirty minutes. The dried products ranged in color from orange to black and had a low swelling ability compared to untreated sapal.

Characterization of the untreated sapal and the sulfuric acid treated sapal for cation exchange properties revealed that the acid treatment produced no significant improvement on the weight exchange properties of sapal. The untreated sapal had a weight exchange capacity of 0.004372 meq / g and a pH titration curve similar to the curve obtained when NaOH is added to water. The treatment with 36N H2SO4 gave a product with a slightly higher weight exchange capacity, 0.009491 meq / g, but with exactly the same pH titration curve as that of untreated sepal. The adsorbing abilities of untreated and sulfuric acid treated sapal for Ca' were 1.903 meq Ca' / g sepal and 2.940 meq Ca' / g sapal. These values were found to be not significantly different.

An alternative treatment of sapal was employed to include phosphate groups in the structure of sapal. Likewise, the treatment did not produce significant effect on the exchange properties of sepal except on its remarkable swelling ability. The "phosphorylated sepal" had a weight exchange capacity of 0.006194 meq / g and a pH titration curve similar to the other forms. Adsorption of Ca' ions was at 2.269 meq / g, which again was not significantly different from the other samples.

Infra red spectra of the untreated and treated samples indicate the presence of functional groups which may serve as ion exchange sites. However, these functional groups were found to be not accessible or too few for significant ion exchange as determined during the characterization.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

Thesis

Document Type

Thesis

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