Purification of Carbon Dots: The Role of Dialysis Time for Effective Photocatalytic Hydrogen Production

July 15, 2026EnergiesOpen Access

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This study investigates how the degree of purification of carbon dots affects the efficiency of photocatalytic hydrogen production in carbon nitride composites.
Carbon dots were synthesized via hydrothermal carbonization from citric acid and ethylenediamine at 180 °C for 8 h.
Purification of carbon dots was conducted through dialysis over 0–72 hours.
Hydrogen evolution reactions (HER) were measured to assess photocatalytic performance.
Purified carbon dots increased hydrogen evolution rates by 1.7 times compared to pristine carbon nitride, achieving 1941 μmol/h·g.
Purification improved electronic properties, reducing charge transfer barriers and preventing recombination of electron/hole pairs.

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Evaluates hydrogen production efficiency in carbon nitride with varying dialysis purification times, suggesting optimal dialysis enhances outcomes.

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Rodríguez et al. (2026) studied this question.

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