Preparation of Improved p-n Junction NiO/TiO₂ Nanotubes for Solar-Energy-Driven Light Photocatalysis

Table 3

Photodegradation of MB dye for TNTs and NiO/TNTs samples under solar light irradiation.

Sample	MB degraded^a; (𝐶0−𝐶)/𝐶0 (%)	𝑘^b(min^−1)
Control^c	43.65	0.001
TNTs	68.35	0.002
NiO/TNTs (0.5 M)	86.11	0.004
NiO/TNTs (1.5 M)	86.18	0.004
NiO/TNTs (2.5 M)	86.29	0.004

^aAfter reaction for 7.5 h.
^bApparent rate constant deduced from linear fitting of ln(𝐶₀/𝐶) versus reaction time.
^cThe control was the photolysis of MB dye.