Photocatalytic behavior of biochar-modified carbon nitride with enriched visible-light reactivity

Lirong Meng, Wenhua Yin, Shengsen Wang, Xiaoge Wu, Jianhua Hou, Weiqin Yin, Ke Feng, Yong Sik Ok, Xiaozhi Wang

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Ultra-thin layered structures and modified bandgaps are two efficient strategies to increase the photocatalytic performance of various materials for the semiconductor industry. In the present study, we combined both strategies in one material to form carbon-doped graphitic carbon nitride (g-C3N4) nano-layered structures by the method of melamine thermal condensation, in the presence of different mass ratios of biochar. The characterization showed that the composite with the best ratio retained the g-C3N4 polymeric framework and the bond with g-C3N4. The biochar was established via π–π stacking interactions and ether bond bridges. The π-conjugated electron systems provided from biochar can elevate charge separation efficiency. The ultra-thin structure also curtailed the distance of photogenerated electrons migrating to the surface and enlarge specific surface area of materials. The presence of carbon narrowed the bandgap and increased light absorption at a wider range of wavelengths of g-C3N4. The biochar/melamine ratio of 1:15 presented the best performance, 2.8 and 5 times faster than g-C3N4 degradating Rhodamine and Methyl Orange, respectively. Moreover, the catalyst presented a good stability for 4 cycles. In addition to that, biochar from waste biomass can be considered a sustainable, cost-effective, and efficient option to modify g–C3N4–based photocatalysts.

Original languageEnglish
Article number124713
Publication statusPublished - 2020 Jan


  • Biochar
  • Carbon-doped g-CN
  • Nanocomposite
  • Photocatalysis
  • Visible light

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis


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