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Analysis of visible - light - active Sn ( ii ) - TiO2 photocatalysts .
 Chemical: Sn ( ii ); Chemical: TiO2
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: Sn ( ii ); Chemical: TiO2