Biosorption of mercury on magnetically modified yeast cells

Yavuz, Handan; Deni̇zli̇, Adil; Güngüneş, H.; Šafařı́ková, Mirka; Šafařı́k, Ivo

doi:10.1016/j.seppur.2006.05.001

Cited by 153 publications

(58 citation statements)

References 29 publications

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“…During the early stage of biosorption process, there was an external surface mass transport or film diffusion process (process I) followed by a constant rate stage (process II) and ultimately by a diffusion stage (process III) where the biosorption process slowed down considerably (30). The very small difference between the vertical error bars, a measure of standard deviation, showed very stable and reproducible results.…”

Section: Effect Of Contact Timementioning

confidence: 94%

Equilibrium, kinetic and thermodynamic biosorption studies of Hg(II) on red algal biomass of Porphyridium cruentum

Zaib

Athar

Saeed

et al. 2016

Green Chemistry Letters and Reviews

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Among a variety of microbial materials employed for biosorption, algae have added advantages of non-toxic and autotrophic nature. In this study, biosorption of Hg(II) was studied with red algal biomass of Porphyridium cruentum. The parameters affecting biosorption such as dosage of biosorbent, pH, contact time, initial metal concentration, temperature and effect of foreign metal cations in binary system were evaluated. Kinetic data were described with the help of pseudofirst-order and pseudo-second-order kinetic models. Langmuir, Freundlich, Temkin and DubininRadushkevich isotherm models were applied to adsorption equilibrium data. According to the results, the maximum removal capacity (q max ) was 2.62 mg/g observed at pH 7 with 0.25 g/L of biosorbent dosage for Hg(II) solution containing 10 mg/L of metal ions. The Langmuir isotherm model fits best to the adsorption data while the kinetic data followed the pseudo-second-order model. Thermodynamics studies showed that the biosorption process of Hg(II) on P. cruentum was exothermic in nature.ARTICLE HISTORY

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Section: Effect Of Contact Timementioning

confidence: 94%

Equilibrium, kinetic and thermodynamic biosorption studies of Hg(II) on red algal biomass of Porphyridium cruentum

Zaib

Athar

Saeed

et al. 2016

Green Chemistry Letters and Reviews

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“…The biomass of some microorganisms (such as bacteria, fungi and algae) has been used for the removal of Hg(II) from aqueous solutions and promising results were obtained [7][8][9][10][11][12][13][14]. However, more efforts are still required to supplement the development of effective biosorption processes for Hg(II) removal.…”

Section: Introductionmentioning

confidence: 99%

Hg(II) Removal from Aqueous Solutions by Bacillus subtilis Biomass

Wang¹,

et al. 2010

CLEAN Soil Air Water

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Research Article Hg(II) Removal from Aqueous Solutions by Bacillus subtilis BiomassThe biosorption of Hg(II) from aqueous solutions using Bacillus subtilis biomass was investigated in this study. The adsorbent was characterized by FTIR. Various factors including solution pH, initial concentration of Hg(II), contact time, reaction temperature and ionic strength were taken into account and promising results were obtained. An initial solution pH of 5.0 was most favorable for Hg(II) removal. The kinetic data was also analyzed using pseudo first order and pseudo second order equations. The results suggested that Hg(II) bioadsorption was best represented by the pseudo second order equation. Freundlich, Langmuir and Langmuir-Freundlich isotherms for the present systems were analyzed. The most satisfactory interpretation for the equilibrium data at different temperatures was given by the Langmuir-Freundlich isotherm. The effect of ionic strength on bioadsorption was significant. Bacillus subtilis biomass could serve as low cost adsorbent to remove Hg(II) from aqueous solutions, especially at lower concentrations of Hg(II) (a20 mg Hg/L).

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“…and 11.8 mg g -1 for Zn 2? (Yavuz et al 2006). Tomska and Wolny found that COD removal for testing unit where the activated sludge return was exposed to magnetic field was as higher as for control unit, while the nitrification process was more effective for testing unit with magnets (Tomska and Wolny 2008).…”

Section: Discussionmentioning

confidence: 99%

Influence of magnetic field on Cr(VI) adsorption capability of given anaerobic sludge

Duan

Yan

et al. 2009

Biodegradation

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To provide beneficial guide for the application of the magnetic field in the bio-treatment of the Cr(VI)-contained wastewater, sludge samples from the control bio-system A (absent of magnetic field) and the contrast bio-system B (present of magnetic field) were used to adsorb the synthetic wastewater with 100 mg l(-1) Cr(VI). Influences of two adsorption modes, single adsorption and once continuous adsorption, on the Cr(VI) adsorption capacities of both sludge samples were compared. And the influence of regeneration on the Cr(VI) adsorption capacities were also studied. The results of adsorption experiments showed that the Cr(VI) adsorption capacities of the first single adsorption for sludge sample A and B were pretty nearly, which were 9.79 and 9.93 mg, respectively. And after 5 single adsorption periods, the total Cr(VI) adsorption capacity and efficiency of the sample B were 25.88 and 55.66 mg Cr(VI) g(-1)VSS, while those of the control were 14.95 and 33.98 mg Cr(VI) g(-1)VSS, respectively. For the sludge sample A and B after a single adsorption, both functions of regeneration were remarkable. But after 13 cycles of the single adsorption-regeneration, the Cr(VI) adsorption capacity and efficiency of the sample B were 110.15 and 189.91 mg Cr(VI) g(-1)VSS, while those of the control were 70.89 and 140.38 mg Cr(VI) g(-1)VSS, respectively. Though the Cr(VI) adsorption capacity of a once continuous adsorption period was more than that of a single adsorption period obviously, the Cr(VI) removal rates of the sludge sample A and B in the third period of once continuous adsorption-regeneration were only 8.12 and 33.51%, respectively. It was concluded that the weak magnetic field did improve the Cr(VI) bio-removal efficiency and the sludge stability, the batch treatment was an ideal operation mode for the bio-treatment of the Cr(VI)-contained wastewater, as compared with the continuous operation mode, but regeneration and enough sludge content were two necessary conditions to ensure the efficiency of batch treatment.

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Biosorption of mercury on magnetically modified yeast cells

Cited by 153 publications

References 29 publications

Equilibrium, kinetic and thermodynamic biosorption studies of Hg(II) on red algal biomass of Porphyridium cruentum

Equilibrium, kinetic and thermodynamic biosorption studies of Hg(II) on red algal biomass of Porphyridium cruentum

Hg(II) Removal from Aqueous Solutions by Bacillus subtilis Biomass

Influence of magnetic field on Cr(VI) adsorption capability of given anaerobic sludge

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