7845
The obtained 3D CdS - HETS composite materials show enhanced H2 generation under visible light irradiation .
 Chemical: CdS; Chemical: H2
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: CdS; Chemical: H2