Discussion
Photocatalytic cement containing titanium dioxide is intended to
Answer: D
Correct answer: break down pollutants and keep surfaces clean
Titanium dioxide is a photocatalyst: under ultraviolet light it generates radicals that oxidise nitrogen oxides and organic matter on the surface. The result is a facade that stays clean and removes some pollution from the air passing it, which is why the material has been used on prominent buildings.
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