Utilization of photocatalytic degradation and efficiency of engineered geopolymer composite tile doped with nano-particles under ultraviolet light.

This study investigates the impact of nano-zinc oxide (ZnO) on the self-cleaning and microstructural performance of engineered geopolymer composites (EGC) for urban cleanliness enhancement. The research focuses on achieving homogeneous dispersion of nano-ZnO through ultrasonication to prevent agglomeration and assess its effects on workability, setting time, mechanical, and microstructural properties of EGC. Results show that incorporating ZnO nanoparticles at 5 % and 10 % concentrations as a surface coating on engineered geopolymer composite creates a highly effective photocatalytic material. This enhanced composite demonstrates significant capability in degrading Rhodamine B (RhB) under UV light exposure over a 15-day period, breaking down organic pollutants into simpler, potentially less toxic substances. The efficiency of degradation depends on factors such as nano-ZnO concentration, UV radiation intensity, and initial pollutant concentration. The optimal dosage of nano-ZnO in EGC is found to be 0.5 %, which enhances hydration and pozzolanic activity, promoting a densified microstructure at the nanoscale. This innovative composite material shows promise as a self-cleaning finishing material for urban buildings, offering potential improvements in both aesthetics and environmental sustainability. [Display omitted] • Optimum dosage of nano-Zinc oxide is found to be 0.5 %. • Eary age compressive strength is enhanced with the addition of 0.5 % nano-ZnO. • Nanoparticles can act as fillers and reduce the size of crystals at the interface at an early age. • With increasing the dosage of nano-ZnO, chances of agglomerations increase due to the intrinsic large surface area of NPs. [ABSTRACT FROM AUTHOR]