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

Freitas, Olga M.; Martins, Ramiro; Delerue–Matos, Cristina; Boaventura, Rui A.R.

doi:10.1016/j.jhazmat.2007.08.081

Cited by 160 publications

(64 citation statements)

References 31 publications

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“…For both copper and lead removal the pseudo-second-order model was the best to fit in both mono and bi-component solutions. These last findings are in accordance with other studies where metals removal by agricultural wastes [8,11] or other biomaterials [12,13], follows usually pseudo-second-order kinetics, which means that the sorption kinetics of these systems depends on the solid phase concentration in the equilibrium and sorption capacity is proportional to the num-ber of active sites occupied on the sorbent, two. The sorption ability of copper and lead by peanut hulls may be attributed to its components, namely cellulose, hemicelluloses, pectin, lignin and protein [2].…”

Section: Kinetic Studiessupporting

confidence: 92%

Copper and lead removal by peanut hulls: Equilibrium and kinetic studies

et al. 2009

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This research work aims to study the use of peanut hulls, an agricultural and food industry waste, for copper and lead removal through equilibrium and kinetic parameters evaluation. Equilibrium batch studies were per-formed in a batch adsorber. The influence of initial pH was evaluated (3-5) and it was selected between 4.0 and 4.5. The maximum sorption capacities obtained for the Langmuir model were 0.21 ± 0.03 and 0.18 ± 0.02 mmol/g, respectively for copper and lead. In bi-component systems, competitive sorption of copper and lead was verified, the total amount adsorbed being around 0.21 mmol of metal per gram of material in both mono and bi-component systems. In the kinetic studies equilibrium was reached after 200 min contact time using a 400 rpm stirring rate, achieving 78% and 58% removal, in mono-component system, for copper and lead respec-tively. Their removal follows a pseudo-second-order kinetics. These studies show that most of the metals removal occurred in the first 20 min of contact, which shows a good uptake rate in all systems.

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Section: Kinetic Studiessupporting

confidence: 92%

Copper and lead removal by peanut hulls: Equilibrium and kinetic studies

et al. 2009

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“…In addition, the values predicted by the pseudo secondorder model are much closer to the experimental q e . Similar results were reported by Freitas, et al [35], who investigated Cd 2+ removal by the dried biomasses of four macroalgae species (Laminaria hyperbora, Sargassum muticum, Fucus spiralis and Bifurcaria bifurcate). The pseudo second-order model best fitted the biosorption of Cd 2+ on Fucus spiralis.…”

Section: Biosorption Kineticssupporting

confidence: 88%

Non-linear Isotherm Models, Cadmium Kinetics, and Biosorption Thermodynamics of Dried Biomass of Native Aphanothece sp. in a Batch System

Satya

Harimawan

Haryani

et al. 2017

J. Eng. Technol. Sci.

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Abstract. Dried biosorbent was prepared from Aphanothece sp. cyanobacteria harvested from a photobioreactor system fed with atmospheric carbon dioxide. Cadmium-ion biosorption of the prepared biosorbent from aqueous solution was characterized by non-linear (Langmuir, Freundlich and Dubinin-Radushkevich) isotherms, non-linear kinetics (pseudo first-order and pseudo second-order) and thermodynamic analysis. The optimum conditions were pH 8.0, 30°C, 0.1 g/L biomass, and 60 min contact time. The biosorption efficiencies exceeded 90%. The low-range data (initial Cd concentration C 0 = 1.09-6.23 mg/L) and highrange data (C 0 = 5.41-83.07 mg/L) were best fitted to the Langmuir model, with maximum uptake capacities of 12.01 and 187.5 mg/g (R 2 = 0.995 and 0.996). In the Dubinin-Radushkevich isotherm model, the mean biosorption energy was 12.91 kJ/mol, suggesting that ion exchange was the working mechanism. The biosorption apparently followed pseudo second-order kinetics (R 2 = 0.994-0.999; k 2 = 2.04 E-03 to 3.86 E-02 g/mg min). The biosorption process was energetically feasible (∆G 0 = −13.47-−8.88 kJ/mol), exothermic (∆H 0 = −74.82 kJ/mol) and tended to become more ordered (∆S 0 = −0.204 kJ/mol K) towards the end of the process. The biosorbent was reusable through three adsorption/desorption cycles in 1 M HCl.

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“…Anthropogenic and industrial-based activities release high amounts of heavy metals into aquatic environments, which significantly disturbs marine life due to their toxic and accumulative natures [1][2][3]. Recently, heavy metal-related pollution in coastal regions has become a serious problem because of its significant environmental degradation [4].…”

Section: Introductionmentioning

confidence: 99%

Monitoring the Pollution Level in Istanbul Coast of the Sea of Marmara Using Algal Species Ulva lactuca L.

Özyiğit¹,

Uyanik²,

Sahin³

et al. 2017

Pol. J. Environ. Stud.

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Heavy metal pollution in coastal regions has become a serious problem due to significant environmental degradations. In the present study, an algal species, U. lactuca, was investigated to assess the impact of heavy metal pollution on the six different locations along the coastal line of the Sea of Marmara in Istanbul. Heavy metal and mineral nutrient elements such as Ca, Cd, Cu, Fe, K, Mg, Mn, Pb, and Zn were determined using ICP-OES. The following lowest and highest concentrations (mg/kg; dw) were measured in Besides, metal deposition in the plant did not alter the mineral nutrient uptake pattern extensively, indicating relatively less contamination risk in the area. Overall, the comparison of heavy metal contents with seawater and sediment samples in the Ulva species showed that U. lactuca is a suitable plant for biomonitoring studies.

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

Cited by 160 publications

References 31 publications

Copper and lead removal by peanut hulls: Equilibrium and kinetic studies

Copper and lead removal by peanut hulls: Equilibrium and kinetic studies

Non-linear Isotherm Models, Cadmium Kinetics, and Biosorption Thermodynamics of Dried Biomass of Native Aphanothece sp. in a Batch System

Monitoring the Pollution Level in Istanbul Coast of the Sea of Marmara Using Algal Species Ulva lactuca L.

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