Photodegradation is the alteration of materials by light. Commonly, the term is used loosely to refer to the combined action of sunlight and air, which cause oxidation and hydrolysis. Often photodegradation is intentionally avoided, since it destroys paintings and other artifacts.

光化学降解，是指在光的作用下，有机化合物降解为碳原子较少的同系物的反应。 土壤中的有机物可能发生两种类型的光降解：直接光解和间接光解。 直接光解指有机化合物直接吸收光子，由基态分子转变为激发态分子而引发的键断裂或者结构重排等光反应。 间接光解则是首先由环境中存在的某些物质吸收光能呈激发态，再诱导有机物激发而分解的光反应。 在自然条件下，土壤环境中 有机污染物 的光化学降解主要是紫外光作用的结果，一般发生在土壤/空气界面，即土壤表 …

2023年3月1日 · Photodegradation plays an essential role in the fate of OMPs, particularly in the surface layer of water bodies, where solar irradiation (i.e., UV and visible light) are abundant during the daytime, thereby inducing direct and indirect photolysis of OMPs.

2013年8月23日 · Photodegradation of polystyrene in air causes discoloration (yellowing), cross-linking, and chain scission due to oxidation. A photodegradation process was also proposed on the basis of the IR spectrum of the photoirradiated film, which indicated the formation of peroxy radical and hydroperoxide intermediates.

Photodegradation is a process in which polymers can be decomposed by absorbing energy from light to generate free radicals. In the presence of oxygen, it is also called photooxidative degradation.

2024年9月11日 · We will highlight recent advances of our understanding of how solar radiation can affect litter decomposition in terrestrial ecosystems, through the photochemical degradation of plant polymers as well as the consequences for biotic decomposition and C cycling and storage.

Photodegradation is the process by which the absorption of photons—particularly those with wavelengths in the UV–visible spectrum—causes a molecule to degrade. During the process, the species evolve and turn into new ones.

2021年2月5日 · Photo-induced production of hydroxyl and alkyl radicals play important roles in CD degradation as affected by temperature, pH, light intensity and wavelength.

The most important feature of the book is the physical interpretation of polymer degradation, e.g. mechanism of UV/light absorption, formation of excited states, energy transfer mechanism, kinetics, dependence on physical properties of macromolecules and polymer matrices, formation of mechanical defects, practics during environmental ageing.

2015年11月27日 · Photodegradation concerns the breaking of a molecule to smaller molecules (degradation and/or mineralization) by means of the absorption of photons of suitable wavelength such as that found in the infrared radiation, visible light, and ultraviolet light of the solar spectrum.