41.
A series of direct Z-scheme FeIn
2S
4/Bi
2WO
6 hierarchical heterostructures with intimate interface contacts were synthesized by in-situ growth route and characterized by systematical analyses. All as-prepared FeIn
2S
4/Bi
2WO
6 nanocomposites showed significantly enhanced photocatalytic activity towards photodegradation for the removal of tetracycline hydrochloride (TCH) in comparison with individual FeIn
2S
4 and Bi
2WO
6. Meanwhile, the highest photocatalytic degradation activity can be achieved by modulating adding amount of FeIn
2S
4 in FeIn
2S
4/Bi
2WO
6 nanocomposites and the optimized component ratio of FeIn
2S
4 to Bi
2WO
6 is determined to be 10 wt%. The enhanced photocatalytic activity could be ascribed to efficient separation between photogenerated holes and electrons based on the construction of direct Z-scheme system. The high photocatalytic stability of resultant 10 wt% FeIn
2S
4/Bi
2WO
6 nanocomposites was revealed through six successive recycling reactions. The main intermediate generated during TCH photodegradation was explored by HPLC-MS. Besides, the direct Z-scheme photocatalytic mechanism was confirmed by band position analysis, electron spin resonance (ESR) and active species capture experiment.
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