6521
Moreover , the as - prepared SnS ( 2 ) / TiO ( 2 ) hierarchical nanostructures as nanoheterojunction photocatalysts exhibited excellent UV and visible light photocatalytic activities for the degradation of organic dyes ( rhodamine B and methyl orange ) and phenols ( 4 - nitrophenol ) , remarkably superior to the TiO ( 2 ) nanofibers and the SnS ( 2 ) nanosheets , mainly owing to the photoinduced interfacial charge transfer based on the photosynergistic effect of the SnS ( 2 ) / TiO ( 2 ) heterojunction .
 Chemical: SnS ( 2 ); Chemical: TiO ( 2 ); Chemical: rhodamine B; Chemical: methyl orange; Chemical: phenols; Chemical: 4 - nitrophenol; Chemical: TiO ( 2 ); Chemical: SnS ( 2 ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 )
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: SnS ( 2 ); Chemical: TiO ( 2 ); Chemical: rhodamine B; Chemical: methyl orange; Chemical: phenols; Chemical: 4 - nitrophenol; Chemical: TiO ( 2 ); Chemical: SnS ( 2 ); Chemical: SnS ( 2 ); Chemical: TiO ( 2 )