Why is my UV spectrophotometer showing zero absorbance for MB dye after 45 minutes of photocatalysis inspite of the dye showing pale blue color?

The photocatalysis was done using nano zinc oxide coated activated carbon at neutral pH using 0.3g of catalyst. Eventhough the solution doesnt show full decolourisation(it shows pale blue colour)...

18 January 2024 5,606 6 View