Lahar as a possible adsorbent in adsorption chromatography

Date

3-1994

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Evelyn B. Rodriguez

Co-adviser

Evamarie P Capareda

Abstract

ABSTRACT MICOR, JOSE RENE LORICA. University of the Philippines Los Ballot, March 1994. Lahar as a Possible Adsorbent in Adsorption Chromatography. Adviser: Dr. Evelyn B. Rodriguez; Co-adviser: Dr. Evamarie P. Capareda.

Mt. Pinatubo lahar from Zambales was evaluated as a possible inexpensive substitute for silica gel in flash and thin layer chromatography. The lahar, reported to contain 60.36% Si02 (Phil. Bureau of Soils, 1991) was processed with hydrochloric and sulfuric acids under different conditions. Unmilled lahar that was heated at 90 °C with 6N HCl for 5 hours yielded a grayish product which exhibited poorer retention of benzyl alcohol as compared to commercial silica gel preparation. Milling the lahar prior to heating with 6N HCI gave a whiter product but benzyl alcohol retention was not improved markedly. Ignition of acid pre-treated lahar at 900 °C did not significantly increase the retention of benzyl alcohol. Soaking the milled lahar in 6N Ha at room temperature over several days produced a fine amorphous white solid which packed too compactly in the chromatographic column. The flowrate for this preparation was too slow to be convenient for flash chromatography. The fine solid from this method was examined as adsorbent for thin layer chromatography using a mixture of azobenzene, m-nitroaniline, and p-nitroaniline. These compounds were not resolved and were eluted Close to the solvent front. Milled lahar that was heated at 90 °C with concentrated H2SO4 for 5 hours yielded a grayish white product. It had an increased retention of benzyl alcohol than the lahar processed with HCI but the retention was lower compared to silica gel.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1994 C4 M53

Document Type

Thesis

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