2.4 Hydrogen production experiments
The tests of photocatalytic H2 evolution performance
were carried out in a 62 mL quartz reaction flask with a flat window.
Specific steps were as follows: TEOA was used as the electron donor,
photocatalyst powder and EY was added into TEOA aqueous solution (15%).
Before light source irradiation, ultrasonic dispersion was used and
lasted to form homogeneous solution, and nitrogen was used to replace
the system air to form anaerobic environment. The photocatalyst in
suspension was evenly dispersed with a magnetic stirrer. A 5 W LED
white-light multi-channel was used as simulated solar light source in
the photocatalytic reaction system. Each time 0.5 mL of evolved gas was
extracted from the reaction flask to analyze the produced hydrogen
amount by taking gas chromatography (Tianmei GC7900, TCD, 13Xcolumn,
N2 as carrier).