Photocatalytic activity test
A photoreactor (XPA‐7 series) was used to test the photocatalytic
activity of the samples. In a typical photodegradation
procedure, 0.05 g photocatalyst and 60 mL methyl orange solution
(20 mg/L) were put in a quartz tube, which was irradiated
with a 300 W high pressure mercury lamp or a 500 W Xe lamp
under continuously stirring. At regular time intervals of irradiation,
5 mL of the liquid mixture was withdrawn and centrifuged,
and the concentration of methyl orange in the clear solution
was measured using a 752/752N UV‐Vis spectrometer
(Shanghai Sunny Hengping, China) at 463.8 nm, where methyl
orange showed its maximum absorption. The results were corrected
for the decomposition of methyl orange in the absence
of catalyst and its adsorption on the catalyst