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DOI: 10.1039/c7cy02456h
The photocatalytic H2 evolution reactions were carried out in a Pyrex reaction cell connected to a closed gas circulation
and evacuation system using a 300 W xenon (Xe) lamp (Beijing Aulight Technology Co. Ltd., Beijing, China) with a cut-
off filter (¦Ë > 420 nm). Photocatalyst (0.05 g) was added to an aqueous solution (50 mL) containing sodium sulfide (Na 2 S;
0.35 M) and sodium sulfite (Na2SO3 ; 0.25 M) in a 300 mL Pyrex glass reactor, and then the suspension was ultrasonically
dispersed for 10 min. Prior to irradiation, the reactor was thoroughly evacuated using a vacuum pump to remove the
dissolved air in the water. The amount of H2 evolved was analyzed using on-line gas chromatography with a thermal con-
ductivity detector (Hua'ai, GC9160, China, MS-5A) with argon as the carrier gas. The co-catalyst (Pt) for the promotion of
H2 evolution was photodeposited in situ on the photocatalyst with chloroplatinic acid hexahydrate (H2PtCl6 ¡¤6H2O) as the precursor. The temperature for all photocatalytic reactions was kept at 25 ¡ãC ¡À 5 ¡ãC.
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