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).