Photoactive and water-repellent g-C3N4/poly(alkyl siloxane) coatings on porous sandstone

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F26%3A00643717" target="_blank" >RIV/68145535:_____/26:00643717 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1007/s10064-025-04675-4" target="_blank" >https://doi.org/10.1007/s10064-025-04675-4</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10064-025-04675-4" target="_blank" >10.1007/s10064-025-04675-4</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photoactive and water-repellent g-C3N4/poly(alkyl siloxane) coatings on porous sandstone

Popis výsledku v původním jazyce

Graphitic carbon nitride (g-C3N4) was synthesised by thermal polycondensation of melamine and subsequently exfoliated by calcination at 600 degrees C for 30, 45, and 60 min. The resulting nanoparticles-differing in morphology, size, and specific surface area-were dispersed in a poly(alkyl siloxane) hydrophobising agent at concentrations of 2 g<middle dot>L--(1) and 4 g<middle dot>L--(1) and applied to the surface of porous quartz sandstone. The effect of the degree of g-C3N4 exfoliation on the self-cleaning performance of the resulting coatings and their interaction with water was evaluated. Photodegradation tests performed on sandstone samples artificially stained with Rhodamine B confirmed a self-cleaning effect for coatings containing particles exfoliated for 45 and 60 min, at a concentration of 4 g of g-C3N4 per litre of poly(alkyl siloxane). The addition of nano-g-C3N4 enhanced the hydrophobicity of the sandstone surface. The coatings substantially reduced water uptake into the stone's pore system while still allowing water vapour to evaporate freely into the surrounding environment. g-C3N4 thus appears to be a promising photocatalytically active nanomaterial for self-cleaning and water-repellent surface protection of building and sculptural stone-a field in which it has not yet been applied.

Název v anglickém jazyce

Photoactive and water-repellent g-C3N4/poly(alkyl siloxane) coatings on porous sandstone

Popis výsledku anglicky

Graphitic carbon nitride (g-C3N4) was synthesised by thermal polycondensation of melamine and subsequently exfoliated by calcination at 600 degrees C for 30, 45, and 60 min. The resulting nanoparticles-differing in morphology, size, and specific surface area-were dispersed in a poly(alkyl siloxane) hydrophobising agent at concentrations of 2 g<middle dot>L--(1) and 4 g<middle dot>L--(1) and applied to the surface of porous quartz sandstone. The effect of the degree of g-C3N4 exfoliation on the self-cleaning performance of the resulting coatings and their interaction with water was evaluated. Photodegradation tests performed on sandstone samples artificially stained with Rhodamine B confirmed a self-cleaning effect for coatings containing particles exfoliated for 45 and 60 min, at a concentration of 4 g of g-C3N4 per litre of poly(alkyl siloxane). The addition of nano-g-C3N4 enhanced the hydrophobicity of the sandstone surface. The coatings substantially reduced water uptake into the stone's pore system while still allowing water vapour to evaporate freely into the surrounding environment. g-C3N4 thus appears to be a promising photocatalytically active nanomaterial for self-cleaning and water-repellent surface protection of building and sculptural stone-a field in which it has not yet been applied.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA24-10949S" target="_blank" >GA24-10949S: Potenciál fotoaktivních nanočástic g-C3N4 k multifunkční ochraně stavebního kamene</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2026

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Bulletin of Engineering Geology and the Environment

ISSN

1435-9529

e-ISSN

1435-9537

Svazek periodika

85

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

15

Strana od-do

42

Kód UT WoS článku

001637729900002

EID výsledku v databázi Scopus

2-s2.0-105024668178