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The graphitic carbon nitride/copper hydroxide photocatalyst, which achieved ∼15.8-fold enhanced visible-light photocatalytic performance for pollutant degradation compared to origin g-C 3 N 4 , was synthesised by chemical deposition strategy. The experimental results show that Cu 2+  ions in Cu(OH) 2  interact with electron-rich N atoms in g-C 3 N 4 . The stronger interaction promotes the change of the local electric field in g-C 3 N 4 /Cu(OH) 2  to obtain a more positive valence band, which can generate strongly oxidised photogenerated holes. This photogenerated holes played a dominant role in pollutant degradation. The present work may provide a promising approach to the fabrication of other efficient photocatalyst.

Design of a higher positive valence band in g-C3N4 photocatalyst for enhanced photocatalytic activity by copper hydroxide deposition