File Name : s-1.tif

Caption : figure s1: edx of (a) zno/rgo, (b) zno/cds and (c) cds/zno/rgo nanocomposites.

File Name : s-2.tif

Caption : figure s2: photograph of the reduction of (a) cr(vi) solution to (b) cr(iii) solution and (c) formation of a green precipitate of cr(oh)3 after adding saturated naoh solution to (b) solution.

File Name : s-3.tif

Caption : figure s3: uv-vis absorption spectra of mb photoreduction by edta-2na as a hole scavenger.

File Name : s-4.tif

Caption : figure s4: uv-vis absorption spectra of mb photoreduction by h2o2 as an electron scavenger.

File Name : s-5.tif

Caption : figure s5: uv-vis absorption spectra of mb photoreduction by dmso used a hydroxyl radical scavenger.