File Name : fig. s1.tif

Caption : fig. s1 absorption intensity of cr(vi) solution from 800 to 300 nm wavelength (a) and standard curve of cr(vi) (b)

File Name : fig. s2.tif

Caption : fig. s2 the particle size distribution of sba-15 and ppy/sba-15

File Name : fig. s3.tif

Caption : fig. s3 adsorption properties for cr(vi) with different py concentrations