Heavy metal adsorption by modified oak sawdust: Thermodynamics and kinetics

Argun, Mehmet Emin; Dursun, Şükrü; Özdemir, Celalettin; Karataş, Mustafa

doi:10.1016/j.jhazmat.2006.06.095

Cited by 681 publications

(335 citation statements)

References 33 publications

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“…The distribution of metal ions between the liquid phase and the solid phase can be described by several isotherm models such as Langmuir, Freundlich and (Bulut and Baysal, 2006;Argun et al, 2006) Dubinin-Radushkevich (D-R). The isotherm equations of these models are summarized in Table 1.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…The Langmuir model assumes that the uptake of metal ions occurs on a homogenous surface by monolayer adsorption without any interaction between adsorbed ions. However, the Freundlich model assumes that the uptake of metal ions occurs on a heterogeneous surface by monolayer adsorption (Bulut and Baysal, 2006) and Dubinin-Radushkevich (D-R) isotherm assumes a heterogeneous surface, too (Argun et al, 2006). In order to find the most appropriate model for the Sci.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

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Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Nameni

Moghadam

Arami

2008

Int. J. Environ. Sci. Technol.

173

117

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ABSTRACT:In this research, adsorption of chromium (VI) ions on wheat bran has been studied through using batch adsorption techniques. The main objectives of this study are to 1) investigate the chromium adsorption from aqueous solution by wheat bran, 2) study the influence of contact time, pH, adsorbent dose and initial chromium concentration on adsorption process performance and 3) determine appropriate adsorption isotherm and kinetics parameters of chromium (VI) adsorption on wheat bran. The results of this study showed that adsorption of chromium by wheat bran reached to equilibrium after 60 min and after that a little change of chromium removal efficiency was observed. Higher chromium adsorption was observed at lower pHs, and maximum chromium removal (87.8 %) obtained at pH of 2. The adsorption of chromium by wheat bran decreased at the higher initial chromium concentration and lower adsorbent doses. The obtained results showed that the adsorption of chromium (VI) by wheat bran follows Langmuir isotherm equation with a correlation coefficient equal to 0.997. In addition, the kinetics of the adsorption process follows the pseudo second-order kinetics model with a rate constant value of 0.131 g/mg.min The results indicate that wheat bran can be employed as a low cost alternative to commercial adsorbents in the removal of chromium (VI) from water and wastewater.

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Section: Adsorption Isothermsmentioning

confidence: 99%

Section: Adsorption Isothermsmentioning

confidence: 99%

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Nameni

Moghadam

Arami

2008

Int. J. Environ. Sci. Technol.

173

117

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“…Just like other carbon-based waste products, sawdust is mostly composed of lignin and cellulose as well as other polar poly functional groups like alcohols, aldehydes, ketones, carboxylate, phenols, and ethers that are able to bind heavy metals through the replacement of hydrogen ions with metal ions in solution or by donation of an electron pair to form complexes with the metal ion in solution (Bulut and Tez 2007;Begum and Alhaji 2013). The high lignin content of sawdust makes it an excellent adsorbent for metals (Byrant et al 1992;Argun et al 2007). Moreover, sawdust contains different functional groups that take part in and increase adsorption capacity (Gad et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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Both the effect of particle size and initial concentration on the adsorption of lead by sawdust of two timber species were investigated using batch experimental equilibrium and kinetic studies. A 100% lead removal efficiency was recorded for the optimum particle size of 1.18 mm for Pycnanthus angolensis and 0.85 mm for Khaya ivorensis at an initial lead concentration of 10 mg/L. Freundlich isotherm (0.83 ≤ R 2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R 2 ≤ 1.0 for Pycnanthus angolensis) performed better than Langmuir and Temkin isotherms. The Dubinin-Radushkevich isotherm was used to ascertain the sorption mechanism. Mean sorption energy (12.48 kJ/mol for Pycnanthus angolensis and 13.42 kJ/mol for Khaya ivorensis) indicated that adsorption was by ion exchange. The pseudo-first order kinetic model (0.96 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R 2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R 2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

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“…Table 2 shows a number of publications that address the sorption capacity of wood sawdust and metals removal from the water phase. The sorption capacity of the sawdust is dependent on a number of factors, such as absorbent dose, size of the sawdust, contact time, temperature, pH, ionic strength of the aqueous solution (Shukla et al, 2002, Argun et al, 2007. Stormwater is often characterized by having low concentrations of many different pollutants and trace metals which limits the efficiency of absorbents such as sawdust.…”

Section: Column Leaching Testmentioning

confidence: 99%

“…This means that the filter itself could release about 13 ton of COD to the water phase which depending on the characteristics of the recipient water body, could eventually causes more environmental problems than the trace metals. This high amount of organic pollutants probably do not leach from other common biosorbents, such as pet, algae and activated carbon (Argun et al, 2007, Gode et al, 2008. Due to the special defence mechanisms found in trees, Due to the fact that trees have a long life time and during its life they have to defend themselves from different threats, they developed defence metabolites (Franceschi et al, 2005, Witzell andMartin, 2008).…”

Section: Effects Of Wood Residualmentioning

confidence: 99%

Sawdust for Treatment of Stormwater - Test on Synthetic Stormwater Contaminated with Heavy Metals

Svensson

Forest²,

Geoffre³

et al. 2017

Eco-Tech

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Stormwater from urban, industrial and rural areas is very often discharged into recipient water bodies without any treatment. This is now changing in many parts of the word, especially in Europe due to The EU Water Framework Directive (European Union, 2000). According to the new policy, will probably stormwater that has often small concentrations but complex mix of different organic and inorganic pollutants has to be treated. Many different systems have been used, such as wetlands and soil infiltration trenches, among others. Sawdust has many times been reported as a good sorbent used for removing mostly toxic metals from wastewaters. However, in most cases, studies have been carried out with distilled water spiked with, for instance, 1-2 different toxic metals. Very few studies have used real wastewater and even less have studied removal of metals from stormwater using sorbent such as sawdust. Sawdust has also drawbacks, since it may release potentially hazardous substances as tannins & lignin, phenolic compounds, resin acids and overall high COD concentrations which results in oxygen depletion in the recipient water bodies. In this paper, the results of using sawdust as sorbent for removal of heavy metal from stormwater with different pollutants are presented.

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Heavy metal adsorption by modified oak sawdust: Thermodynamics and kinetics

Cited by 681 publications

References 33 publications

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Adsorption of hexavalent chromium from aqueous solutions by wheat bran

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Sawdust for Treatment of Stormwater - Test on Synthetic Stormwater Contaminated with Heavy Metals

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