Table 2.

Catalytic degradation with band gap energy:(pure and Mg-doped ZnO NPs)

Sample	Band gap (Eg) eV	Degradation (%) at 120 min	Degradation rate constant (k)
ZnO NPs	3.36	13.18	1.09 × 10−3
2.5% Mg-ZnO NPs	3.27	30.76	2.76 × 10− 3
5% Mg-ZnO NPs	3.13	56.04	5.72 × 10− 3
7.5% Mg-ZnO NPs	3.04	78.02	1.26 × 10−2