Competitive biosorption behavior of Pt(<scp>iv</scp>) and Pd(<scp>ii</scp>) by Providencia vermicola

Xu, Hang; Tan, Ling; Dong, Haigang; He, Jia; Liu, Xinxing; Qiu, Guanzhou; He, Qiwen; Xie, Jianping

doi:10.1039/c7ra02786a

Cited by 31 publications

(9 citation statements)

References 33 publications

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“…The clear multi‐linearity for the three biosorbents implied the process involved more than one kinetic stage. The fastest sorption stage was attributed to the diffusional process of Pd (II) to the bacteria surface, and the second portion could be ascribed to intra‐particle diffusion with a delayed process The better fit of the pseudo‐second‐order model indicated that the chemical sorption, involving valency forces by exchange or sharing of electrons between sorbent and sorbate, was the rate‐limiting step which was similar to the results of the Elovich model.…”

Section: Resultssupporting

confidence: 56%

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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Section: Resultssupporting

confidence: 56%

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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“…Langmuir-type sorption occurs when the intermolecular forces decrease quickly with distance; that is, the surface of the biosorbent is covered by adsorbate, which forms a layer on the biomass. The linear Langmuir isotherm is given by [30]:…”

Section: = +mentioning

confidence: 99%

Behavior and Mechanism of Cesium Biosorption from Aqueous Solution by Living Synechococcus PCC7002

Chai

et al. 2020

Microorganisms

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Many efforts have focused on the adsorption of metals from contaminated water by microbes. Synechococcus PCC7002, a major marine cyanobacteria, is widely applied to remove metals from the ocean’s photic zone. However, its ability to adsorb cesium (Cs) nuclides has received little attention. In this study, the biosorption behavior of Cs(I) from ultrapure distilled water by living Synechococcus PCC7002 was investigated based on kinetic and isotherm studies, and the biosorption mechanism was characterized by Fourier-transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectrometry, and three-dimensional excitation emission matrix fluorescence spectroscopy. Synechococcus PCC7002 showed extremely high tolerance to Cs ions and its minimal inhibitory concentration was 8.6 g/L. Extracellular polymeric substances (EPS) in Synechococcus PCC7002 played a vital role in this tolerance. The biosorption of Cs by Synechococcus PCC7002 conformed to a Freundlich-type isotherm model and pseudo-second-order kinetics. The binding of Cs(I) was primarily attributed to the extracellular proteins in EPS, with the amino, hydroxyl, and phosphate groups on the cell walls contributing to Cs adsorption. The biosorption of Cs involved two mechanisms: Passive adsorption on the cell surface at low Cs concentrations and active intracellular adsorption at high Cs concentrations. The results demonstrate that the behavior and mechanism of Cs adsorption by Synechococcus PCC7002 differ based on the Cs ions concentration.

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“…Providencia genus belongs to Enterobacteriaceae family of Enterobacteriales order of Gammaproteobacteria class, comprising of nine species of gram-negative rods 16 . Some strains of P. vermicola have been successfully incorporated in sequestration and biosorption of palladium, lead sulphite, and platinum 29 – 31 . Here, we report for the first time, the isolation of thoriotolerant P. thoriotolerans sp.…”

Section: Resultsmentioning

confidence: 99%

Exemplifying an archetypal thorium-EPS complexation by novel thoriotolerant Providencia thoriotolerans AM3

Shukla

Parmar

Goswami

et al. 2021

Sci Rep

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It is the acquisition of unique traits that adds to the enigma of microbial capabilities to carry out extraordinary processes. One such ecosystem is the soil exposed to radionuclides, in the vicinity of atomic power stations. With the aim to study thorium (Th) tolerance in the indigenous bacteria of such soil, the bacteria were isolated and screened for maximum thorium tolerance. Out of all, only one strain AM3, found to tolerate extraordinary levels of Th (1500 mg L−1), was identified to be belonging to genus Providencia and showed maximum genetic similarity with the type strain P. vermicola OP1T. This is the first report suggesting any bacteria to tolerate such high Th and we propose to term such microbes as ‘thoriotolerant’. The medium composition for cultivating AM3 was optimized using response surface methodology (RSM) which also led to an improvement in its Th-tolerance capabilities by 23%. AM3 was found to be a good producer of EPS and hence one component study was also employed for its optimization. Moreover, the EPS produced by the strain showed interaction with Th, which was deduced by Fourier Transform Infrared (FTIR) spectroscopy.

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Competitive biosorption behavior of Pt(iv) and Pd(ii) by Providencia vermicola

Cited by 31 publications

References 33 publications

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

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

Behavior and Mechanism of Cesium Biosorption from Aqueous Solution by Living Synechococcus PCC7002

Exemplifying an archetypal thorium-EPS complexation by novel thoriotolerant Providencia thoriotolerans AM3

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