Ruthenium(ii)?tris-bipyridine/titanium dioxide codoped zeolite Y photocatalysts: II. Photocatalyzed degradation of the model pollutant 2,4-xylidine, evidence for percolation behaviorDedicated to the memory of Nobel Laureate, Lord George Porter FRSC FRS OM.For part I, see ref. 19.Electronic supplementary information (ESI) available: preliminary photolysis experiments. See http://www.rsc.org/suppdata/pp/b2/b212377k/