Abstract
Bioleaching of precious metals from waste printed circuit boards such as using cyanogenic cultures for extraction of gold and silver has gained considerable attention. It has the advantages of low cost and environmental friendliness. However, low efficiency hindered its industrialization. In this study, a novel strategy has been proposed to improve bioleaching efficiency. We applied optical microscopy to investigate the surface interactions between bacteria and silver particles in two-step bioleaching. Results showed that bacterial adsorption and extracellular polymeric substances (EPS) binding were the primary negative behavior that hindered the leaching reaction. Functional group analysis by Fourier-transform infrared spectroscopy indicated that carboxyl, hydroxyl, and amine groups were the main chemical structures responsible for the negative influences. Bacteria–metal interactions were reduced in the presence of polyvinylpyrrolidone (PVP), and the silver recovery increased 1.8 times. Imaging analysis ...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
