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Hypophosphite wastewater treatment is still a critical issue in metallurgical processes and the oxidation of hypophosphite to phosphate followed by the precipitation of phosphate is an important strategy for hypophosphite wastewater treatment. Herein, Ti 4 O 7 /g-C 3 N 4  photocatalysts with various mass ratios (Ti 4 O 7  (m): g-C 3 N 4  (m) = 0.5, 0.2, 0.1, and 0.05) were synthesized by a hydrolysis method and the effect of the mass ratio of Ti 4 O 7  (m): g-C 3 N 4  (m) on Ti 4 O 7 /g-C 3 N 4  visible light photocatalytic oxidation of hypophosphite was evaluated. The as-prepared Ti 4 O 7 /g-C 3 N 4  were characterized and confirmed by SEM, XPS, XRD and FTIR. Moreover, the specific surface area and the distribution of pore size of Ti 4 O 7 /g-C 3 N 4  was also analyzed. Our results showed that Ti 4 O 7 /g-C 3 N 4  exhibited remarkably improved photocatalytic performance on hypophosphite oxidation compared with g-C 3 N 4  and meanwhile 1:2-Ti 4 O 7 /g-C 3 N 4  with a mass ratio of 0.5 showed the best photocatalytic performance with the highest oxidation rate constant (17.7-fold and 91.0-fold higher than that of pure g-C 3 N 4  and Ti 4 O 7 , respectively). The enhanced performance of photocatalytic oxidation of hypophosphite was ascribed to the heterojunction structure of Ti 4 O 7 /g-C 3 N 4  with broader light absorption and significantly enhanced efficiency of the charge carrier (e − -h + ) generation and separation. Additionally, the generated ·OH and ·O    2    -radicals contributed to the hypophosphite oxidation during the photocatalytic system.

Ti4O7/g-C3N4 for Visible Light Photocatalytic Oxidation of Hypophosphite: Effect of Mass Ratio of Ti4O7/g-C3N4