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Peer-reviewedCC BY-NC-ND 4.0ACS Omega

Constructing an Ohmic-like Type-I Heterojunction via Electrostatic Self-Assembly of Silver Cyanamide and g-C3N4 for Boosted Photocatalytic Performance

  • Haidong Yu1
  • Qiyue Gao1
  • Hao Liu1
  • Dong Li1
  • Xiao Zhang1
  • Ping Qu2
  • Tong Wu
  1. 1China Geological Survey , , ,
  2. 2China Geological Survey Center for Geophysical Survey , ,
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Abstract

Developing efficient heterojunction photocatalysts for organic pollutant removal remains an important goal in water treatment. We prepared Ag2NCN/g-C3N4 (ACN) composites with different Ag2NCN loadings via electrostatic self-assembly. Under full-spectrum light, ACN-2 degraded 99 % of Rhodamine B within 30 min, with a rate constant 5.7 times that of pristine g-C3N4. It also exhibited good reusability and achieved 61.2 % total organic carbon removal. Mechanistic studies indicated that the composite forms an ohmic-like type-I heterojunction. The Fermi-level offset across the Ag2NCN/g-C3N4 heterojunction gives rise to a built-in electric field at the heterointerface, which facilitates directional charge migration from g-C3N4 toward Ag2NCN and effectively curbs carrier recombination. Superoxide anions (•O2–) and photoinduced holes (h+) served as the dominant reactive species. This work offers a straightforward route to type-I heterojunctions with improved charge separation through interfacial electric field engineering, and provides practical insights for designing effective photocatalysts for wastewater treatment.

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Cite

BibTeXRIS
BibTeX
@article{yu2026constructing,
  title = {{Constructing an Ohmic-like Type-I Heterojunction via Electrostatic Self-Assembly of Silver Cyanamide and g-C3N4 for Boosted Photocatalytic Performance}},
  author = {Haidong Yu and Qiyue Gao and Hao Liu and Dong Li and Xiao Zhang and Ping Qu and Tong Wu},
  journal = {ACS Omega},
  year = {2026},
  month = oct,
  doi = {10.1021/acsomega.6c09257},
  url = {https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09257/5454093/Constructing-an-Ohmic-like-Type-I-Heterojunction},
  note = {CC BY-NC-ND 4.0},
}
RIS
TY  - JOUR
TI  - Constructing an Ohmic-like Type-I Heterojunction via Electrostatic Self-Assembly of Silver Cyanamide and g-C3N4 for Boosted Photocatalytic Performance
AU  - Haidong Yu
AU  - Qiyue Gao
AU  - Hao Liu
AU  - Dong Li
AU  - Xiao Zhang
AU  - Ping Qu
AU  - Tong Wu
PY  - 2026
DA  - 2026/10/20
JO  - ACS Omega
DO  - 10.1021/acsomega.6c09257
UR  - https://pubs.acs.org/acsodf/article/doi/10.1021/acsomega.6c09257/5454093/Constructing-an-Ohmic-like-Type-I-Heterojunction
AB  - Developing efficient heterojunction photocatalysts for organic pollutant removal remains an important goal in water treatment. We prepared Ag2NCN/g-C3N4 (ACN) composites with different Ag2NCN loadings via electrostatic self-assembly. Under full-spectrum light, ACN-2 degraded 99 % of Rhodamine B within 30 min, with a rate constant 5.7 times that of pristine g-C3N4. It also exhibited good reusability and achieved 61.2 % total organic carbon removal. Mechanistic studies indicated that the composite forms an ohmic-like type-I heterojunction. The Fermi-level offset across the Ag2NCN/g-C3N4 heterojunction gives rise to a built-in electric field at the heterointerface, which facilitates directional charge migration from g-C3N4 toward Ag2NCN and effectively curbs carrier recombination. Superoxide anions (•O2–) and photoinduced holes (h+) served as the dominant reactive species. This work offers a straightforward route to type-I heterojunctions with improved charge separation through interfacial electric field engineering, and provides practical insights for designing effective photocatalysts for wastewater treatment.
SN  - 2470-1343
ER  -