Biosorption of lead and cadmium using marine algae

Nessim, Ramzy B.; Bassiouny, Ahmad R.; Zaki, Hermine R.; Moawad, Madelyn N.; Kandeel, Kamal

doi:10.1080/02757540.2011.607439

Cited by 72 publications

(25 citation statements)

References 34 publications

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“…These factors accounts for the higher adsorption of lead than cadmium on adsorbents (Barka et al, 2013). Similar result has been reported (Nessim et al, 2014).…”

Section: Effect Of Solution Phsupporting

confidence: 86%

Sawdust-kaolinite composite as efficient sorbent for heavy metal ions

Ogbu

Osunkunle

et al. 2019

Bangladesh J. Sci. Ind. Res.

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The improvement of the adsorption capacity of clay minerals using chemicals though effective is expensive, results in secondary contamination and noxious to the environment. This study was therefore aimed at the development of a new sawdust clay modified adsorbent (SDKC) as an alternative means of improving the adsorption capacity of kaolinite. The adsorbents were characterized by the Fourier transform infrared spectroscopy and X-ray diffraction analysis. Batch sorption was employed to determine the effect of pH, metal concentration, sorbent dose, time and temperature on the removal of Pb (II) and Cd (II) ions from solution by the adsorbents. Optimum operating conditions of pH 6.0, metal concentration 200mg/L, sorbent dose 0.1g was obtained. Equilibrium isotherm analysis indicated the Langmuir, Temkin and Flory-Huggins models to be more suitable than the Freundlich, Dubinin–Radushkevich (D-R). The kinetic data were analyzed using the pseudo-first order, pseudo-second order, the Elovich and intraparticle diffusion models. The analysis revealed that the adsorption process followed pseudo second order model. The calculated thermodynamic parameters showed an endothermic, spontaneous and a physisorption process between both metal ions and the adsorbents. The obtained result of the experiment indicated a significant improvement in the uptake of Pb (II) and Cd (II) ions on the sawdust modified kaolinite adsorbent than the untreated kaolinite clay. This could be utilized as an alternative to chemical treatment methods Bangladesh J. Sci. Ind. Res.54(1), 99-110, 2019

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“…These factors accounts for the higher adsorption of lead than cadmium on adsorbents (Barka et al, 2013). Similar result has been reported (Nessim et al, 2014).…”

Section: Effect Of Solution Phsupporting

confidence: 86%

Sawdust-kaolinite composite as efficient sorbent for heavy metal ions

Ogbu

Osunkunle

et al. 2019

Bangladesh J. Sci. Ind. Res.

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“…As shown in Fig 12, it is observed that desorption of both metal ions was very rapid, up to 90% of the maximum elution of the metal ions occurred within 5min after which it increased slightly until an optimum desorption was achieved around 20min. the rapid desorption kinetics elucidates the applicability of the desorption process (Nessim et al, 2011).…”

Section: Desorption and Adsorbent Recyclingmentioning

confidence: 99%

“…However, the percentage removal decreased from 72.3 to 60.4% and 60.3 to 50.6% for Ni(II) and Mn(II) ions respectively from the 1st to the 3rd cycle of adsorption. The diminishing adsorption of metals over the cycles may be due to the destructive effect of the desorbing agent (with continuous use) and the weight loss of UAB during desorption (Nessim et al, 2011). But in general, these observations still prove that UAB could be recovered and reused for metal adsorption using 0.1M HCl as desorbing agent.…”

Section: Desorption and Adsorbent Recyclingmentioning

confidence: 99%

Potential of a low-cost bentonite for heavy metal abstraction from binary component system

Akpomie

Dawodu

2015

Beni-Suef University Journal of Basic and Applied Sciences

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BentoniteHeavy metals Equilibrium Kinetics Thermodynamics a b s t r a c t A low-cost and easily obtainable Nigerian bentonite (UAB) was utilized for the removal of heavy metals (Nickel and Manganese) from a binary system. The bentonite was used without chemical modification in order to keep the process cost low. A Fourier transform infrared spectrum was utilized to determine the surface functional groups responsible for adsorption. Scanning electron microscopy revealed a porous surface of UAB. Batch adsorption methodology was applied to study the effect of pH, initial metal ion concentration, adsorbent dose, adsorbent particle size, ligands (citric acid and EDTA), contact time and temperature on the adsorption process. The isotherm data were analyzed using the Langmuir, Freundlich, Temkin and Scatchard isotherm. Scatchard plot analysis revealed the heterogeneous nature of UAB. Kinetic parameters were tested using the pseudo-first order, pseudo-second order, intraparticle and film diffusion models. The presence of film diffusion mechanism was found to play a major role in the adsorption process. Thermodynamic studies revealed an endothermic, spontaneous and physical adsorption process.Importantly, over 90% of both metal ions were desorbed from the bentonite in desorption studies. The results indicated the potential of UAB as a low-cost and eco-friendly adsorbent for the removal of Ni(II) and Mn(II) ions from aqua media.

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“…The adsorption kinetics followed a pseudo second-order reaction. Nessim et al [189] studied Ulva fasciata (green algae) and Sarsagum sp. (Brown algae) for the removal of Cd(II), and observed that brown algae showed 2 times higher efficiency then green algae.…”

Section: Microbial and Animal Biomass As Biosorbentmentioning

confidence: 99%