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Z-scheme photocatalysts,with strong redox ability,have a great potential for pollutants degradation.However,it is challenging to construct efficient Z-scheme photocatalysts because of their poor interfacial charge separation.Herein,by employing transparent and conductive SnO2 as electron mediator to pass light through and promote interracial charge transportation,a novel Z-scheme photocatalyst Si-SnO2-TiOx(1 < x < 2) was constructed.The Z-scheme photocatalyst displayed an order of magnitude higher photocurrent density and a 4-fold increase in open-circuit potential compared to those of Si.Moreover,the onset potential shifted negatively for approximately 2.2 V.Benefiting from these advantages,this Z-scheme Si-SnO2-TiOx exhibited efficient photocatalytic performance toward phenol degradation and mineralization.75% of the phenol was degraded without bias potential and 70% of the TOC was removed during phenol degradation.Other typical pollutants such as bisphenol A and atrazine could also be degraded without bias potential.Introducing a transparent and conductive electron mediator to construct Z-scheme photocatalyst gives a new sight to the improvement of photocatalytic performance in Z scheme.