Photocatalytic Degradation of Alizarin Red S, Amaranth, Congo Red, and Rhodamine B Dyes Using UV Light Modified Reactor and ZnO, TiO₂, and SnO₂ as Catalyst

Table 1

Kinetic data of alizarin red S, amaranth, congo red, and rhodamine B dye.

Dyes	Alizarin red S dye			Amaranth dye			Congo red dye			Rhodamine B dye
Conditions	K (min^−1)	t1/2 (min)	R^2	K (min^−1)	t1/2 (min)	R^2	K (min^−1)	t1/2 (min)	R^2	K (min^−1)	t1/2 (min)	R^2
Without catalyst	0.0261	26.55	0.8611	0.028	24.7	0.7768	0.0548	12.6	0.7464	0.0391	17.7	0.825
ZnO	0.2118	3.27	0.7993	0.146	4.74	0.8348	0.2452	2.8	0.8382	0.1915	3.6	0.76
TiO2	0.1188	5.83	0.8372	0.0671	10.3	0.7678	0.0976	7.1	0.7764	0.0843	8.2	0.837
SnO2	0.0877	7.90	0.7995	0.0447	15.5	0.6976	0.0653	10.6	0.8921	0.0585	11.84	0.816