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<p>This study presents a novel ternary composite photocatalyst, titanium dioxide/graphene oxide/graphitic carbon nitride (TGN), for the simultaneous oxidation of cyanide (CN⁻) and reduction of hexavalent chromium Cr(VI) from co-contaminated aqueous solutions. Synthesized via a hydrothermal method, TGN demonstrated outstanding performance, achieving complete oxidation of cyanide to cyanate (CNO⁻) and full reduction of Cr(VI) to Cr(III) under optimized conditions (pH = 10). Kinetic analysis revealed that the TGN catalyst exhibits promising rate constants for the degradation of cyanide and hexavalent chromium. The TG and TN composites demonstrated good photocatalytic activity. For Cr(VI) reduction, TGN surpassed TG and TN by a factor of 2 and exceeded the activities of pristine g-C<sub>3</sub>N<sub>4</sub> and graphene oxide. The treated effluent was free of Cr(VI) and exhibited significantly reduced toxicity, with Cr(III) precipitating as hydroxide and adsorbing onto the TGN surface. These results underscore TGN’s potential as a highly efficient and sustainable photocatalyst for the remediation of industrial wastewater.</p> Graphical abstract <p></p>

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Simultaneous photocatalytic removal of cyanide and Cr(VI) under alkaline conditions by using TiO2/g-C3N4/graphene oxide composite: a synergistic approach

  • 期刊论文

  • 发表日期：

    2026年4月7日

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  • José M. Barrera-Andrade,
  • Elim Albiter,
  • Miguel A. Valenzuela

摘要

This study presents a novel ternary composite photocatalyst, titanium dioxide/graphene oxide/graphitic carbon nitride (TGN), for the simultaneous oxidation of cyanide (CN⁻) and reduction of hexavalent chromium Cr(VI) from co-contaminated aqueous solutions. Synthesized via a hydrothermal method, TGN demonstrated outstanding performance, achieving complete oxidation of cyanide to cyanate (CNO⁻) and full reduction of Cr(VI) to Cr(III) under optimized conditions (pH = 10). Kinetic analysis revealed that the TGN catalyst exhibits promising rate constants for the degradation of cyanide and hexavalent chromium. The TG and TN composites demonstrated good photocatalytic activity. For Cr(VI) reduction, TGN surpassed TG and TN by a factor of 2 and exceeded the activities of pristine g-C3N4 and graphene oxide. The treated effluent was free of Cr(VI) and exhibited significantly reduced toxicity, with Cr(III) precipitating as hydroxide and adsorbing onto the TGN surface. These results underscore TGN’s potential as a highly efficient and sustainable photocatalyst for the remediation of industrial wastewater.

Graphical abstract