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To prepare mpg-C3N4/r (r refers to the initial silica/cyanamide mass ratio),
cyanamide (3 g, 72 mmol; Aldrich) was dissolved in different amounts of a 40% dispersion of 12-nm
SiO2 particles (Ludox HS40,Aldrich) in water (1.5, 3.75, 7.5, 12.25 g Ludox for the r=0.2 0.5,1,1.5,) with
stirring at 333 K overnight.

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