Biorecycling of Precious Metals and Rare Earth Elements

Deplanche, K.; Murray, Angela J.; Mennan, Claire; Taylor, Scott; Macaskie, Lynne E.

doi:10.5772/25653

Cited by 17 publications

(20 citation statements)

References 106 publications

(104 reference statements)

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“…However PMs can be bio-refined from wastes into new catalytic materials (e.g. reviews by Macaskie et al 2011;Deplanche et al 2011;De Corte et al 2012), the activity of which can be comparable to (or exceed) that of pure metal catalysts (Mabbett et al 2006;Yong et al 2010;Macaskie et al 2011;Murray et al 2015).…”

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confidence: 99%

One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction

et al. 2015

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confidence: 99%

One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction

et al. 2015

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“…Inside the reactor were placed 8 reticulated polyurethane foam discs. Each of the foam discs had been coated with biofilm and after being packed in the reactor the column was challenged with the inflow solution (upward flow), [33] …”

Section: Column Descriptionmentioning

confidence: 99%

“…N14 are produced in a fermentor vessel, with a turnaround time for each fermentor preparation of approximately 10-14 days, [32,33] which is unacceptable for bulk manufacture for an industrial process. Therefore, the first objective of this study was to construct and evaluate a modular 'offchamber' system, whereby a biofilm-forming chamber was inserted into the continuous biomass outflow from the main chamber of the chemostat vessel.…”

Section: Introductionmentioning

confidence: 99%

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Construction and evaluation of a modular biofilm-forming chamber for microbial recovery of neodymium and semi-continuous biofilm preparation. Tolerance of Serratia sp.N14 on acidic conditions and neutralized aqua regia

Vavlekas

2016

Environmental Technology

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Recovery of neodymium from liquid metallic wastes and scrap leachates is a crucial step for its recycling, which can take place through the immobilized biofilms of Serratia sp. N14. These biofilms are produced in a fermentor vessel with a turnaround time of 10-14 days, which is unacceptable from an economic point of view for an industrial process. This study proposes the construction and evaluation of a modular system, whereby a biofilm-forming chamber is inserted into the continuous biomass outflow of the main chemostat vessel, for an alternative semi-continuous and economic production of biofilm. The activity of the biofilm from the outflow chamber was found to be the same as the one from the main chamber, which was stored in a cold room (4°C), for 9-12 months, depending on a 24 h nucleation step.Moreover, the ability of the biofilm to function in the presence of a leaching agent (aqua regia) or in acidic conditions was also evaluated. The biofilm of the main chamber can remain active even at 50% neutralized aqua regia (pH 3.0), while at acidic conditions, phosphate release of the cells is reduced to 50%. This strain proves to be very tolerant in low pH or high salt concentration solutions. The biofilm produced from the outflow of the main fermentor vessel is of acceptable activity, rather than being disposed.

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“…Taking into account also the need to conserve primary resources and recycle precious metals, by applying this biotechnological approach, effective bionanocatalyst can be sourced from metal-containing wastes [21,22], potentially providing a low-cost route to nanocatalyst production with low environmental impact. The precious metal can be easily and economically recovered from the used catalyst by incineration, sonication or microwaving the biomass [6].…”

Section: Introductionmentioning

confidence: 99%

Selective hydrogenation using palladium bioinorganic catalyst

Zhu

Wood

Deplanche

et al. 2016

Applied Catalysis B: Environmental

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a b s t r a c tPalladium bioinorganic catalyst (bio-Pd) was manufactured using bacteria (Desulfovibrio desulfuricans and Escherichia coli) via the reduction of Pd(II) to bio-scaffolded Pd(0) nanoparticles (NPs). The formed Pd NPs were examined using electron microscopy and X-ray powder diffraction methods: a loading of 5 wt% Pd showed an average particle size of ∼4 nm. The catalytic activities of the prepared bio-Pd NPs on both bacteria were compared in two hydrogenation reactions with that of a conventionally supported Pd catalyst (Pd/Al 2 O 3 ). Concentration profiles of the different hydrogenation products were fitted using a Langmuir-Hinshelwood expression. In 2-pentyne hydrogenation, 5 wt% Pd E.coli achieved 100% of 2-pentyne conversion in 20 mins and produced 10.1 ± 0.7 × 10 −2 mol L −1 of desired cis-2-pentene; in contrast 5 wt% Pd/Al 2 O 3 yielded 6.5 ± 0.4 × 10 −2 mol L −1 of cis-2-pentene after 40 mins. In the solvent-free hydrogenation of soybean oil, the use of 5 wt% Pd E.coli yielded cis-C18:1 of 1.03 ± 0.04 mol L −1 and trans-C18:1 of 0.26 ± 0.03 mol L −1 (∼50% less of the latter than 5 wt% Pd/Al 2 O 3 ) after 5 h. Similar results were obtained using bio-Pd E.coli and bio-Pd D.desulfuricans . Bio-Pd was concluded to have the advantage of a lower cis-trans isomerisation in hydrogenation of alkyne/alkenes. Hence biomanufacturing is an environmentally attractive, scalable and facile alternative to conventional heterogeneous catalyst for application in industrial hydrogenation processes. D. desulfuricans is inconvenient to grow at scale but wastes of E. coli are produced from various industrial processes. 'Second life' (i.e. recycled from a pilot scale biohydrogen production process) E. coli cells were used to make bio-Pd catalysts. Although 'bio-Pd secondlife gave a slower conversion rate of 2-pentyne and soybean oil compared to bio-Pd from purpose-grown cells it showed a higher selectivity to the cis-isomer product.

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Biorecycling of Precious Metals and Rare Earth Elements

Cited by 17 publications

References 106 publications

One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction

One step bioconversion of waste precious metals into Serratia biofilm-immobilized catalyst for Cr(VI) reduction

Construction and evaluation of a modular biofilm-forming chamber for microbial recovery of neodymium and semi-continuous biofilm preparation. Tolerance of Serratia sp.N14 on acidic conditions and neutralized aqua regia

Selective hydrogenation using palladium bioinorganic catalyst

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