Photosynthesis of Au/TiO<inf>2</inf> nanoparticles for photocatalytic gold recovery from industrial gold-cyanide plating wastewater
Issued Date
2022-12-01
Resource Type
eISSN
20452322
Scopus ID
2-s2.0-85144320943
Pubmed ID
36535954
Journal Title
Scientific Reports
Volume
12
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Scientific Reports Vol.12 No.1 (2022)
Suggested Citation
Kunthakudee N., Ramakul P., Serivalsatit K., Hunsom M. Photosynthesis of Au/TiO<inf>2</inf> nanoparticles for photocatalytic gold recovery from industrial gold-cyanide plating wastewater. Scientific Reports Vol.12 No.1 (2022). doi:10.1038/s41598-022-24290-7 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/86360
Title
Photosynthesis of Au/TiO<inf>2</inf> nanoparticles for photocatalytic gold recovery from industrial gold-cyanide plating wastewater
Author(s)
Other Contributor(s)
Abstract
A series of Aux/TiO2 nanoparticles (NPs) with different gold loadings (x = 0.1–1.0 wt%) was synthesized by the photodeposition and then employed as photocatalysts to recover precious component from the industrial gold-cyanide plating wastewater. Effects of Au loading, catalyst dosage and types of hole scavenger on the photocatalytic gold recovery were investigated under ultraviolet–visible (UV–Vis) light irradiation at room temperature. It was found that different Au loadings tuned the light absorption capacity of the synthesized photocatalysts and enhanced the photocatalytic activity in comparison with the bare TiO2 NPs. The addition of CH3OH, C2H5OH, C3H8O, and Na2S2O3 as a hole scavenger significantly promoted the photocatalytic activity of the gold recovery, while the H2O2 did not. Among different hole scavengers employed in this work, the CH3OH exhibited the highest capability to promote the photocatalytic gold recovery. In summary, the Au0.5/TiO2 NPs exhibited the best photocatalytic activity to completely recover gold ions within 30 min at the catalyst dosage of 0.5 g/L, light intensity of 3.20 mW/cm2 in the presence of 20 vol% CH3OH as hole scavenger. The photocatalytic activity slightly decreased after the 5th cycle of recovery process, indicating its high reusability.
