Adsorption of Cd, Cu, Ni, Pb and Zn on Sphagnum peat from solutions with low metal concentrations

Kalmykova, Yuliya; Strömvall, Ann-Margret Hvitt; Steenari, Britt‐Marie

doi:10.1016/j.jhazmat.2007.07.062

Cited by 112 publications

(71 citation statements)

References 27 publications

(45 reference statements)

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“…The removal percentages were 39.2, 37.1, 25.3 and 21.8% for Cu(II), Ni(II), Cd(II), and Co(II), respectively. The membrane showed a higher affinity for Cu(II) and Ni(II), which could be explained by the hard acidbase theory which states that hard acids have a strong affinity for hard bases, whereas soft acids prefer soft bases [3,29]. Both Cu 2+ …”

Section: Competetive Adsorptionmentioning

confidence: 98%

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Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Mokhena¹,

Jacobs²,

Luyt³

2017

Express Polym. Lett.

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Section: Competetive Adsorptionmentioning

confidence: 98%

“…Percentage adsorption of Cu(II) by the electrospun nanofibres after regeneration for five desorption/ adsorption cycles referred to as soft acids [3,29]. In view of this the membrane could possibly be classified as an 'intermediate' carboxylate base.…”

mentioning

confidence: 99%

Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Mokhena¹,

Jacobs²,

Luyt³

2017

Express Polym. Lett.

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“…The reason for the higher adsorption of the Pb 2+ ion might be due to its ionic potential, electronegativity, and softness parameters. Lead has an electronegativity of 2.33, while zinc has an electronegativity of 1.65 (Kalmykova et al 2008). Since the electronegativity of lead is higher, its adsorption capacity should be greater (Depci et al 2012).…”

Section: Kinetics Studiesmentioning

confidence: 99%

Equilibrium Isotherm, Kinetic, and Thermodynamic Studies of Divalent Cation Adsorption onto Calamus gracilis Sawdust-Based Activated Carbon

Adebisi¹,

Chowdhury²,

Hamid³

et al. 2017

BioResources

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Activated carbon (RSAC) was prepared using the two steps of hydrothermal carbonization (HTC) and chemical activation from the sawdust of Calamus gracilis, commonly known as Rattan (RS). The HTC process was carried out using a Teflon-lined autoclave to produce hydrochar, followed by chemical activation using phosphoric acid (H3PO4). The highest removal percentage obtained for lead, Pb(II), and zinc, Zn(II), cations were 86.71% and 64.26%, respectively, using the initial adsorbate concentration of 350 mg/L at 30 °C. These values strongly indicated the promising adsorption potential of the newly prepared hydrochar-based activated carbon (RSAC) for the better management of industrial wastewater and effluents. The analysis of the equilibrium sorption data revealed that these adsorptions followed the Langmuir isotherm model and the pseudo-second order kinetic model. The adsorption process was endothermic and spontaneous. The prepared carbon (RSCAC) showed enhanced surface area with porous texture, which could effectively aid for elimination of Pb(II) and Zn(II) cations from waste water.

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“…The saprist peat had a greater cation-exchange capacity and its smaller ash content might be attributed to its zone of formation within the bog (Spedding 1988) and its greater degree of decomposition (Malterer et al 1992). The more decomposed the peat is, the greater the proportion of fulvic acid and hydroxyl groups compared with humic acid and carboxyl groups (Kalmykova et al 2008).…”

Section: Peat Characterization and Physico-chemical Propertiesmentioning

confidence: 99%

Peat Characterization and Uptake of Nickel (II) and Cobalt (II) in a Saprist Peat Column

Asapo

Coles

2012

Adsorption Science & Technology

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ABSTRACT:In this study, fibrist and saprist sphagnum peat soils taken from a bog in Torbay, Newfoundland (Canada) were characterized. The saprist and fibrist peat soils had wet bulk densities of 0.65 and 0.60 g/cm 3 , respectively, and cation-exchange capacities of 70 and 45 meq/100 g, respectively. The pH of both peat soils was 4.2 and the soils were amorphous for the most part; however, the fibrist peat was more porous than the saprist peat. Results of Fourier transform infrared spectroscopy and 13 carbon nuclear magnetic resonance suggested the presence of carboxylic acid, alcoholic hydroxyl, phenolic hydroxyl, amine and amide functional groups in both peats. The less reported amine and amide groups may have been observed because non-destructive characterization techniques were employed. The saprist peat was studied as an Ni 2+ and Co 2+ adsorbent in a vertical downflow fixed-bed column and at the end of each column experiment, metal ions in the upper layer of the peat were desorbed with HCl. The metal sorption capacity of the saprist peat increased with decreasing flow rate and overall the sorption capacity of Ni 2+ was two times greater than the sorption capacity of Co 2+. Ni 2+ may have been retained by a combination of ion exchange and complexation, while Co 2+ may have been retained only by complexation.

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Adsorption of Cd, Cu, Ni, Pb and Zn on Sphagnum peat from solutions with low metal concentrations

Cited by 112 publications

References 27 publications

Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Electrospun alginate nanofibres as potential bio-sorption agent of heavy metals in water treatment

Equilibrium Isotherm, Kinetic, and Thermodynamic Studies of Divalent Cation Adsorption onto Calamus gracilis Sawdust-Based Activated Carbon

Peat Characterization and Uptake of Nickel (II) and Cobalt (II) in a Saprist Peat Column

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