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UV photolysis

Ultraviolet (UV) photolysis technology, a key branch or precursor of advanced oxidation processes (AOPs), utilizes UV light energy of a specific wavelength to trigger the chemical transformation of pollutants.

The mechanisms by which UV photolysis degrades pollutants primarily include direct and indirect photolysis:

· Direct photolysis: Target molecules absorb photons, breaking chemical bonds. These free radicals then utilize their powerful oxidative capacity to degrade the target molecules, disrupting their molecular structure and leading to degradation.

· Indirect photolysis: UV light decomposes active substances in water to produce free radicals.

UV photolysis technology primarily targets the following types of pollutants:

· Photosensitivity and recalcitrant organic compounds, such as NDMA

· Volatile organic compounds (VOCs)

· Specific toxic and hazardous photosensitive organic compounds

In the ultrapure water preparation process for the electronics industry, 185nm UV light is used to remove total organic carbon (TOC) from water.

UV photolysis can also degrade residual chlorine and ozone in water.

The energy of UV photolysis photons varies depending on the UV wavelength. The energy of these photons is E = hV. During photolysis, the energy of photons of different UV wavelengths must be greater than the molecular bond energy required to trigger the photochemical reaction.

Pollutant Selectivity and Treatment Depth: UV photolysis is not highly effective against all organic compounds. Its effectiveness is highly dependent on the pollutant's molecular structure, chemical bond energy, and absorption capacity for specific UV wavelengths.

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