Poster Title (Current Submission)

Study of the Effect of Hematite on the Photo-degradation of Humic Substances in Presence of Nitric Acid.

Presenter Information

Tricia L. AbernathyFollow

Major(s)

Chemistry

Minor(s)

Spanish

Mentor Name

Dr. Vicki H. Grassian

Mentor Department

Chemistry

Abstract

Humic Substances (HS) are complex organic compounds found in atmospheric and aqueous environments. They resemble the organic material found in tropospheric aerosol particles and in liquid droplets. HS have been proven to react with light in a process called photolysis yielding a modified and decomposed version of the reactant. This may impact the surface transparency of water, bioactivity and other ecological functions.

Nitrates are also abundant materials found in the atmosphere and in natural bodies of water. Both nitrates and HS are photochemically active between 290nm and 400nm on the electromagnetic spectrum. Upon their photolysis, the products formed are expected to react, resulting in a new chemical species that would likely influence the photo-degradation of HS. Similarly, hematite (iron oxide, Fe2O3) is a naturally occurring mineral that may alter the photodegradation of HS in nitric acid in the atmosphere.

A series of experiments were performed considering various factors, such as irradiation time, to understand the effect of hematite on the photolysis and resulting optical properties of HS reacted with HNO3. ATR-FTIR and XPS instrumentation was used to observe changes in the chemical composition of HS. Results suggest that the described procedure increases the photo-decomposition of HS and the effect of hematite is currently under analysis.

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Study of the Effect of Hematite on the Photo-degradation of Humic Substances in Presence of Nitric Acid.

Humic Substances (HS) are complex organic compounds found in atmospheric and aqueous environments. They resemble the organic material found in tropospheric aerosol particles and in liquid droplets. HS have been proven to react with light in a process called photolysis yielding a modified and decomposed version of the reactant. This may impact the surface transparency of water, bioactivity and other ecological functions.

Nitrates are also abundant materials found in the atmosphere and in natural bodies of water. Both nitrates and HS are photochemically active between 290nm and 400nm on the electromagnetic spectrum. Upon their photolysis, the products formed are expected to react, resulting in a new chemical species that would likely influence the photo-degradation of HS. Similarly, hematite (iron oxide, Fe2O3) is a naturally occurring mineral that may alter the photodegradation of HS in nitric acid in the atmosphere.

A series of experiments were performed considering various factors, such as irradiation time, to understand the effect of hematite on the photolysis and resulting optical properties of HS reacted with HNO3. ATR-FTIR and XPS instrumentation was used to observe changes in the chemical composition of HS. Results suggest that the described procedure increases the photo-decomposition of HS and the effect of hematite is currently under analysis.