Biorecovery mechanism of palladium as nanoparticles by Enterococcus faecalis: From biosorption to bioreduction

Cui, Jiaying; Zhu, Nengwu; Kang, Naixin; Ha, Chitam; Shi, Chaohong; Wu, Pingxiao

doi:10.1016/j.cej.2017.07.124

Cited by 48 publications

(22 citation statements)

References 23 publications

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“…The surface character of E. faecalis was revealed by XPS and FT-IR spectrum. These results showed that chemicals with carboxyl groups, hydroxyl groups, and amine groups participated in Pd recovery (Figure 9) [74]. In the synthesis of CdSe NPs by S, cerevisiae ATCC9763, capping of the NPs with intracellular protein molecules improved dispersion in water.…”

Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 92%

“…The surface character of E. faecalis was revealed by XPS and FT-IR spectrum. These results showed that chemicals with carboxyl groups, hydroxyl groups, and amine groups participated in Pd recovery (Figure 9) [74]. F. oxysporum hydrolyzed ZrF6 2− ions to form ZrO2 NPs.…”

Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 94%

“…The surface character of E. faecalis was revealed by XPS and FT-IR spectrum. These results showed that chemicals with carboxyl groups, hydroxyl groups, and amine groups participated in Pd recovery (Figure 9) [74]. Although Pd NPs were synthesized by incubating E. faecalis Pd solution with sodium formate, Pd was not reduced without sodium formate.…”

Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 95%

“…XRD analysis revealed Pd NPs synthesis. According to TEM observation of the cell, Pd NPs were located at the cell membrane and inside the cell [74].…”

Section: Other Metal Nanoparticlesmentioning

confidence: 99%

“…synthesis. According to TEM observation of the cell, Pd NPs were located at the cell membrane and inside the cell [74]. Desulfovibrio vulgaris DSM 644 synthesized Pt NPs and Pd NPs by incubating in MOPS buffer with Na2PdCl4 or PtCl4.…”

Section: Active Molecules In Metal Nanoparticle Synthesis By Microorganismsmentioning

confidence: 99%

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Synthesis of Metal Nanoparticles by Microorganisms

Kato

Suzuki

2020

SSRN Journal

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Metal nanoparticles (NPs), with sizes ranging from 1-100 nm, are of great scientific interest because their functions and features differ greatly from those of bulk metal. Chemical or physical methods are used to synthesize commercial quantities of NPs, and green, energy-efficient approaches generating byproducts of low toxicity are desirable to minimize the environmental impact of the industrial methods. Some microorganisms synthesize metal NPs for detoxification and metabolic reasons at room temperature and pressure in aqueous solution. Metal NPs have been prepared via green methods by incubating microorganisms or cell-free extracts of microorganisms with dissolved metal ions for hours or days. Metal NPs are analyzed using various techniques, such as ultraviolet-visible spectroscopy, electron microscopy, X-ray diffraction, electron diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Numerous publications have focused on microorganisms that synthesize various metal NPs. For example

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Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 92%

“…The surface character of E. faecalis was revealed by XPS and FT-IR spectrum. These results showed that chemicals with carboxyl groups, hydroxyl groups, and amine groups participated in Pd recovery (Figure 9) [74]. F. oxysporum hydrolyzed ZrF6 2− ions to form ZrO2 NPs.…”

Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 94%

“…The surface character of E. faecalis was revealed by XPS and FT-IR spectrum. These results showed that chemicals with carboxyl groups, hydroxyl groups, and amine groups participated in Pd recovery (Figure 9) [74]. Although Pd NPs were synthesized by incubating E. faecalis Pd solution with sodium formate, Pd was not reduced without sodium formate.…”

Section: The Synthesis Of Ag Nps Affected the Monosaccharide Composition Of Capsular Exopolysaccharides Frommentioning

confidence: 95%

“…XRD analysis revealed Pd NPs synthesis. According to TEM observation of the cell, Pd NPs were located at the cell membrane and inside the cell [74].…”

Section: Other Metal Nanoparticlesmentioning

confidence: 99%

Section: Active Molecules In Metal Nanoparticle Synthesis By Microorganismsmentioning

confidence: 99%

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Synthesis of Metal Nanoparticles by Microorganisms

Kato

Suzuki

2020

SSRN Journal

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Influence of sulfhydryl sites on palladium (II) adsorption by displaying EC20 on the surface of Escherichia coli

Tan

Xiao

Cui

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND: Sulfhydryl binding dominates metal adsorption onto bacteria, however, their role in palladium adsorption under high metal loading conditions remains unclear. We investigated their influence on palladium adsorption by increasing (expression of EC20 protein) and decreasing (selective blocking of -SH) the number of sulfhydryl sites on the surface of Escherichia coli (E. coli). RESULTS: Kinetic and equilibrium studies confirmed that the sulfhydryl sites in the EC20 protein played an important role in Pd (II) adsorption, while blocking the sulfhydryl sites resulted in the decrease of adsorption capacity. The accumulation of palladium in the surface of E. coli BL21 cells was enhanced by displaying EC20 protein, and morphology properties of Pd-loaded cells changed considerably. SEM and TEM analyses showed that palladium ions were absorbed both in the exterior and interior of cells. Pd-S bond was detected by XPS in Pd-loaded cells, and it was demonstrated that the unbound sulfhydryl site was a contributor in Pd (II) adsorption.CONCLUSION: Sulfhydryl sites on the surface of E. coli are significant functional groups in Pd (II) adsorption, increasing their number by EC20 protein expression leads to the increase of Pd (II) adsorption capacity, and vice versa. Salt effectThe experiments were carried out as adsorption experiments with method 2.4, except that a final concentration of NaCl at 0.01, 0.04, 0.09, 0.16, 0.25, 0.36 mol L -1 was added to the BL21 and EC20 J Chem Technol Biotechnol 2018; 93: [3569][3570][3571][3572][3573][3574][3575][3576][3577][3578][3579][3580][3581]

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Biosynthesis Parameters Control the Physicochemical and Catalytic Properties of Microbially Supported Pd Nanoparticles

Morriss,

Cheung,

Nunn

et al. 2024

Small

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The biosynthesis of Pd nanoparticles supported on microorganisms (bio‐Pd) is achieved via the enzymatic reduction of Pd(II) to Pd(0) under ambient conditions using inexpensive buffers and electron donors, like organic acids or hydrogen. Sustainable bio‐Pd catalysts are effective for C‐C coupling and hydrogenation reactions, but their industrial application is limited by challenges in controlling nanoparticle properties. Here, using the metal‐reducing bacterium Geobacter sulfurreducens, it is demonstrated that synthesizing bio‐Pd under different Pd loadings and utilizing different electron donors (acetate, formate, hydrogen, no e− donor) influences key properties such as nanoparticle size, Pd(II):Pd(0) ratio, and cellular location. Controlling nanoparticle size and location controls the activity of bio‐Pd for the reduction of 4‐nitrophenol, whereas high Pd loading on cells synthesizes bio‐Pd with high activity, comparable to commercial Pd/C, for Suzuki–Miyaura coupling reactions. Additionally, the study demonstrates the novel synthesis of microbially‐supported ≈2 nm PdO nanoparticles due to the hydrolysis of biosorbed Pd(II) in bicarbonate buffer. Bio‐PdO nanoparticles show superior activity in 4‐nitrophenol reduction compared to commercial Pd/C catalysts. Overall, controlling biosynthesis parameters, such as electron donor, metal loading, and solution chemistry, enables tailoring of bio‐Pd physicochemical and catalytic properties.

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Biorecovery mechanism of palladium as nanoparticles by Enterococcus faecalis: From biosorption to bioreduction

Cited by 48 publications

References 23 publications

Synthesis of Metal Nanoparticles by Microorganisms

Synthesis of Metal Nanoparticles by Microorganisms

Influence of sulfhydryl sites on palladium (II) adsorption by displaying EC20 on the surface of Escherichia coli

Biosynthesis Parameters Control the Physicochemical and Catalytic Properties of Microbially Supported Pd Nanoparticles

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