Efficiency and durability of g-C3N4-based coatings applied on mortar under peeling and washing trials

Yu Yang, Tao Ji, Zhengxian Yang, Yong Zhang, Wenyue Su, Ronghan Wu, Zehao Wu

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Durability of photocatalytic coatings is a major concern in engineering practice. Here, two types of novel visible light-responsive coatings, both consisting of vinyl chloride/vinyl ester/ethylene copolymer (as a binder) and graphitic carbon nitride (g-C3N4) but different in fabrication, are proposed and applied on the mortar surface. The first type is mono-layer coating (MC), where the g-C3N4 suspension containing the binder is directly sprayed on the mortar. The second type is double-layer coating (DC), where the binder layer is applied on mortar surface before spraying the g-C3N4 layer. Results show that the binder addition leads to a good anchorage of the coatings on both MC and DC mortar substrates, along with desirable resistance to peeling and washing, compared to the g-C3N4 coated mortar without the binder. The well-distributed binder in g-C3N4-based coating inevitably decreases the photocatalytic efficiency of the MC mortar due to masking effect of the binder on the coating surface. The DC mortar, on the contrary, takes full advantage of the binder adhesion by inserting a binder layer and therefore holds strong resistance to peeling and washing without compromising its photocatalytic efficiency. The proposed DC technique provides a promising strategy to fabricate highly cost-effective and durable photocatalytic coatings applied on cementitious materials.

Original languageEnglish
Article number117438
Number of pages11
JournalConstruction and Building Materials
Volume234
DOIs
Publication statusPublished - 2020

Keywords

  • Durability
  • g-CN-based coatings
  • Mortar substrate
  • Photocatalytic NO removal

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