Abstract
The biorecovery of platinum group metals (PGM) from spent catalyst waste is gaining widespread interest as an alternative to conventional recovery processes. A challenging aspect of the biorecovery of PGM from spent automotive catalyst (SAC) is the low biomobilization of PGM due to the complex nature of SAC. This work discusses statistical optimization of the bioleaching parameters using a central composite design for the biorecovery of PGM from SAC. A novel approach is presented where PGM from sequentially pretreated SAC is optimally recovered using heat oxidation, sonication, and reduction prior to bioleaching. An engineered strain of Chromobacterium violaceum was able to leach Pt (76 %), Pd (81 %), and Rh (100 %) from SAC at a pulp density of 0.5 % w/v following three days of spent medium leaching. Under the same conditions, pretreatment of SAC using formic before leaching enhanced the leaching efficiency to Pt (91 %), Pd (95 %), and Rh (100 %) following two days of spent medium leaching. Overall, this study demonstrates the effectiveness of sequential pretreatment before bioleaching and statistical optimization of bioleaching for enhanced biorecovery of PGM.
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.
