Kinetic modeling and equilibrium studies during cadmium biosorption by dead Sargassum sp. biomass

Cruz, Claudio C.V.; Costa, Antônio Carlos Augusto da; Henriques, Cristiane A.; Luna, Aderval S.

doi:10.1016/s0960-8524(03)00194-9

Cited by 243 publications

(118 citation statements)

References 28 publications

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“…This mode of metal capture is referred to as active uptake (Kapoor et al, 1999). If one considers that nonviable biomass is not biologically active, its metal uptake can be regarded as a passive adsorption process and, thus, be correlated with mathematical sorption models as the Langmuir and Freundlich equations (Cruz et al, 2004). Furthermore the bacterial surfaces contain polarizable groups (sites) such as phosphate, carboxyl, hydroxyl and amino groups, which are capable of interacting with cations.…”

Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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-Enterococcus faecium, a lactic acid bacterium (LAB), was evaluated for its ability to remove copper(II) ions from water. The effects of the pH, contact time, initial concentration of copper(II) ions, and temperature on the biosorption rate and capacity were studied. The initial concentrations of copper(II) ions used to determine the maximum amount of biosorbed copper(II) ions onto lyophilised lactic acid bacterium varied from 25 mg L -1 to 500 mg L -1 . Maximum biosorption capacities were attained at pH 5.0 and 6.0. Temperature variation between 20°C and 40°C did not affect the biosorption capacity of the bacterial biomass. The highest copper(II) ion removal capacity was 106.4 mg per g dry biomass. The correlation regression coefficients show that the biosorption process can be well defined by the Freundlich equation. The change in biosorption capacity with time was found to fit a pseudo-second-order equation.

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Section: Brazilian Journal Of Chemical Engineeringmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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“…The pseudo-first-order Lagergren model [12] considers that the occupation rate of adsorption sites is proportional to the number of unoccupied sites [13]: t k e ads 1, e 1 q q (1) where q (mg g -1 ) is the amount of metal ion adsorbed at any given time t (min), q e (mg g -1 ) is the amount of metal ion adsorbed at equilibrium and k 1,ad (min -1 ) is the Lagergren rate constant.…”

Section: Reaction Modelsmentioning

confidence: 99%

Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: Kinetic modelling

Freitas

Martins

Delerue–Matos

et al. 2008

Journal of Hazardous Materials

158

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Specific marine macro algae species abundant at the Portuguese coast (Laminaria hiperborea, Bifurcaria bifurcata, Sargassum muticum and Fucus spiralis) were shown to be effective for removing toxic metals (Cd(II), Zn(II) and Pb(II)) from aqueous solutions. The initial metal concentrations in solution were about 75-100 mg L -1 . The observed biosorption capacities for cadmium, zinc and lead ions were in the ranges of 23.9-39.5 mg g -1 , 18.6-32.0 mg g -1 and 32.3-50.4 mg g -1 , respectively. Kinetic studies revealed that the metal uptake rate was rather fast, with 75% of the total amount occurring in the first 10 min for all algal species.Experimental data were well fitted by a pseudo-second order rate equation. The contribution of internal diffusion mechanism was significant only to the initial biosorption stage. Results indicate that all the studied macro algae species can provide an efficient and cost-effective technology for eliminating heavy metals from industrial effluents.

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“…These results confirmed the paramount role of electrostatic attractions in the ratelimiting step. Sorption process is chemisorption in nature (Gupta et al 1998;Cruz et al 2004;Gupta et al 2004). …”

Section: Sorption Kineticsmentioning

confidence: 99%

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

2015

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Site-specific functionalizations are the emergent attention for the enhancement of sorption latent of heavy metals. Limited chemistry has been applied for the fabrication of diafunctionalized materials having potential to tether both environmentally stable oxidation states of chromium (Cr(III) and Cr(VI). Polyaniline impregnated nanocellulose composite (PANI-NCC) has been fabricated using click chemistry and explored for the removal of Cr(III) and Cr(VI) from hydrological environment. The structure, stability, morphology, particle size, surface area, hydrophilicity, and porosity of fabricated PANI-NCC were characterized comprehensively using analytical techniques and mathematical tools. The maximum sorption performance of PANI-NCC was procured for (Cr(III): 47.06 mg g -1 ; 94.12 %) and (Cr(VI): 48.92 mg g -1 ; 97.84 %) by equilibrating 0.5 g sorbent dose with 1000 mL of 25 mg L -1 chromium conc. at pH 6.5 and 2.5 for Cr(III) and Cr(VI), respectively. The sorption data showed a best fit to the Langmuir isotherm and pseudosecond-order kinetic model. The negative value of DG°(-8.59 and -11.16 kJ mol -1 ) and DH°(66.46 9 10 -1 and 17.84 9 10 -1 kJ mol -1 ), and positive value of DS°(26.66 and 31.46 J mol -1 K -1 ) for Cr(III) and Cr(VI), respectively, reflect the spontaneous, feasibility, and exothermic nature of the sorption process. The application of fabricated PANI-NCC for removing both the forms of chromium in the presence of other heavy metals was also tested at laboratory and industrial waste water regime. These findings open up new avenues in the row of high performance, scalable, and economic nanobiomaterial for the remediation of both forms of chromium from water streams.

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Kinetic modeling and equilibrium studies during cadmium biosorption by dead Sargassum sp. biomass

Cited by 243 publications

References 28 publications

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Removal of Cd(II), Zn(II) and Pb(II) from aqueous solutions by brown marine macro algae: Kinetic modelling

Site-specific functionalization for chemical speciation of Cr(III) and Cr(VI) using polyaniline impregnated nanocellulose composite: equilibrium, kinetic, and thermodynamic modeling

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