13873
For photocatalytic degradation of methylene blue , the rate constant of the TiO 2 ( 001 ) - graphdiyne composite is 1 . 63 +/- 0 . 15 times that of the pure TiO 2 ( 001 ) and 1 . 27 +/- 0 . 12 times that of the TiO 2 ( 001 ) - graphene composite .
 Chemical: methylene blue; Chemical: TiO 2; Chemical: graphdiyne; Chemical: TiO 2; Chemical: TiO 2; Chemical: graphene
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: methylene blue; Chemical: TiO 2; Chemical: graphdiyne; Chemical: TiO 2; Chemical: TiO 2; Chemical: graphene