Synthesis of TiO₂/Pd and TiO₂/PdO Hollow Spheres and Their Visible Light Photocatalytic Activity

Table 3

Photocatalytic degradation activity for TiO₂, TiO₂-T, TiO₂/Pd, and TiO₂/PdO and previously reported photocatalysts for Rh B degradation under visible light irradiation.

Sample	Degradation (%)	First-order kinetic equation	(min^-1)
Bare	28.6		0.0079
TiO2/PdO (black)	3.4		0.00026
TiO2	76.23		0.034
TiO2-T	89.14		0.058
TiO2/Pd	94.04		0.063
TiO2/PdO	100		0.126
Pd/TiO2^[a] [27]	94	—	—
PdO/TiO2^[b] [27]	94	—	—
TiO2^[c] [12]	85		0.013
P25^[d] [11]	—		0.023

Footnotes: The test conditions for [a], [b], [c], and [d] in the reference are 30 mg of the photocatalysts and 50 mL of a solution of Rh B (10 mg/L, irradiation time is 50 min), 30 mg of photocatalysts and 50 mL of a solution of Rh B (10 mg/L, irradiation time is 150 min), and 30 mg of photocatalysts and 50 mL of a solution of Rh B (4.8 mg/L, irradiation time is 120 min), respectively.