PHOTOOXIDATION Meaning and
Definition
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Photooxidation is a chemical process that involves the reaction of a substance with atmospheric oxygen or other oxidizing agents under the influence of light energy, particularly ultraviolet (UV) radiation. The term is commonly used in the field of environmental science and chemistry to describe the degradation or alteration of organic compounds caused by exposure to light.
During photooxidation, the energy from light stimulates the oxidation process by providing the necessary activation energy. This leads to the formation of reactive oxygen species, such as singlet oxygen or hydroxyl radicals, which participate in chemical reactions with the target compound.
This phenomenon is often observed in the atmosphere, where the presence of organic pollutants, such as volatile organic compounds (VOCs), can undergo photooxidation reactions initiated by sunlight. These reactions can result in the formation of secondary products, such as ozone, which can contribute to the formation of smog and other air pollution issues.
In the field of materials science, photooxidation refers to the degradation or discoloration of materials like polymers or pigments when exposed to light. The process can occur due to the breaking of chemical bonds within the material structure, leading to changes in physical properties and, in some cases, reduced functionality or aesthetic quality.
Overall, photooxidation is a significant chemical process that occurs in nature and can have various implications in both environmental and materials science contexts.
Etymology of PHOTOOXIDATION
The word "photooxidation" is derived from two primary roots: "photo-" and "oxidation".
The prefix "photo-" is derived from the Greek word "phos", which means "light". It is commonly used as a prefix in scientific terms related to light, such as photography, photocopy, photovoltaic, etc.
The term "oxidation" comes from the Latin word "oxidare", which means "to combine with oxygen". It refers to a chemical reaction that involves the loss of electrons or hydrogen atoms, often resulting in the formation of new compounds.
Combining these roots, "photooxidation" refers to a process or reaction that is initiated or catalyzed by light and involves the oxidation of a substance. In the context of chemistry or environmental science, it commonly refers to the reaction between a substance and oxygen in the presence of light, leading to the formation of new compounds.
