Author:
Kunthakudee Naphaphan,Ramakul Prakorn,Serivalsatit Karn,Hunsom Mali
Abstract
AbstractA 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.
Funder
Mahidol University for postdoctoral fellowship program
Publisher
Springer Science and Business Media LLC
Reference56 articles.
1. Yongpisanphob, W. Industry Outlook 2021–2023: Electronics. (Krungsri Research 2021).
2. Kato, M. & Okinaka, Y. Some recent developments in non-cyanide gold plating for electronics applications. Gold Bull. 37(1), 37–44 (2004).
3. Kunarti, E. S., Roto, R., Nuryono, N., Santosa, S. J. & Fajri, M. L. Photocatalytic reduction of AuCl4− by Fe3O4/SiO2/TiO2 nanoparticles. Glob. NEST J. 22, 119–125 (2020).
4. Sharma, R., Kaneriya, R., Patel, S., Bindal, A. & Pargaien, K. Microwave integrated circuits fabrication on alumina substrate using pattern up direct electroless nickel and immersion Au plating and study of its properties. Microelectron. Eng. 108, 45–49 (2013).
5. Vorobyova, T., Poznyak, S., Rimskaya, A. & Vrublevskaya, O. Electroless gold plating from a hypophosphite-dicyanoaurate bath. Surf. Coat. Technol. 176, 327–336 (2004).
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献