“Smog-eating” photocatalytic coatings

The Delhi government has announced a time-bound feasibility study on the use of “smog-eating” photocatalytic coatings on roads, pavements, and public spaces to reduce air pollutants such as nitrogen dioxide (NO₂) and harmful hydrocarbons.

MoU for Field Trials

The Environment Department has been directed to sign an MoU with a reputed scientific institution within 30 days to conduct field trials and evaluation of titanium dioxide (TiO₂)-based surfaces.

TiO2 creates hydroxyl radicals and superoxides when exposed to UV light, which, as they oxidize, naturally decompose any surrounding atmospheric nitrous dioxides (NO2).

This photodegradation process transforms these pollution-causing particulates into water-soluble sulfates (nitrates), which are then washed away from the pavement surface when it rains.

Benefits of Titanium Dioxide

Experts note that titanium dioxide is:

• Low-cost
• Chemically stable
• Compatible with traditional construction materials

Research Backing

According to research published in the journal Nanomaterials, TiO₂-based photocatalytically active construction materials have been demonstrated to be effective in gaseous depollution and environmental cleaning processes.

(Source: IE)