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. 2015 Aug 14;5:13083. doi: 10.1038/srep13083

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(a) TiO₂; (b) rGO-TiO₂; (c) Fe(III)/TiO₂; (d) Fe(III)/rGO-TiO₂; (e) rGO-TiO₂ obtained from the sample (d) after the removal of Fe(III) by HCl solution; (f) TiO₂ obtained from the sample (e) after the removal of rGO by high-temperature calcination.