Photocatalytic Decolourization of Direct Yellow 9 on Titanium and Zinc Oxides

Table 1

Pseudofirst-order rate constants 𝑘_app and half-live times 𝑡_1/2 for photocatalytic degradation of DY9 upon irradiation with solar simulated light (500 W/m²) at varying DY9 concentration.

DY9 concentration/𝜇mol·L^−1	TiO2 (1.5 g·L^−1)		ZnO (1.5 g·L^−1)
	𝑘app/min^−1	𝑡1/2/min	𝑘app/min^−1	𝑡1/2/min
10	0.0758	9	0.0989	7
30	0.0314	22	0.0669	10
50	0.0312	22	0.0491	14
80	0.0226	31	0.0300	23
100	0.0180	39	0.0250	28