Biosorption of Rhodamine 6G from aqueous solutions onto almond shell (Prunus dulcis) as a low cost biosorbent

Şentürk, Hasan Basri; Özdeş, Duygu; Duran, Celal

doi:10.1016/j.desal.2009.10.021

Cited by 181 publications

(73 citation statements)

References 31 publications

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“…Recent literature reports several studies on the effective adsorption of many organic compounds such as pesticides [153,154,271,[282][283][284][285][286][287][288][289], phenolic compounds [290][291][292][293][294][295], dyes [144,[296][297][298][299][300][301], PAHs [302,303], explosives [304] and pharmaceuticals and hormonal compounds [85,[305][306][307] by a variety of adsorbents prepared from agricultural wastes. The list of materials that have been tested in such studies is long (and still increasing).…”

Section: Industrial and Agricultural Wastes And By-productsmentioning

confidence: 99%

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Dordio

Carvalho

2013

Journal of Hazardous Materials

189

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Section: Industrial and Agricultural Wastes And By-productsmentioning

confidence: 99%

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Dordio

Carvalho

2013

Journal of Hazardous Materials

189

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“…Generally, the change in free energy from -20 to 0 kJ/mol and the enthalpy up to 4.2 kJ/mol are characteristic of physical adsorption (due to relatively weak van der Waals attraction forces), whereas the change in free energy between -80 and -400 kJ/mol and enthalpy more than 21 kJ/mol indicate chemical adsorption (due to stronger interactions involving ionic or covalent bonding sorbatesorbent) (Senturk et al 2010;Weng et al 2008;Chen et al 2011;Khormaei et al 2007).…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

Industrial Cellolignin Wastes as Adsorbent for Removal of Methylene Blue Dye from Aqueous Solutions

Șuteu

Măluțan²

2012

BioResources

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Cellolignin, a by-product from the wood processing industry, was studied as a new, eco-friendly adsorbent for the removal of methylene blue cationic dye from aqueous solutions, using a batch adsorption procedure. Experimental data were processed in order to study the equilibrium, thermodynamics, and kinetics of methylene blue adsorption onto cellolignin. Between the two studied isotherm models (Freundlich and Langmuir) the Langmuir model better described the equilibrium adsorption data at temperatures higher than 25 °C; the mean free energy (E) values obtained from the Dubinin-Radushkevich isotherm model show that the sorption of dye occurs via surface electrostatic interactions with the active sites of the cellolignin. The equilibrium data were used to calculate the free energy, enthalpy and entropy changes, and isosteric heat of adsorption (ΔH X ). Results confirm the feasibility and the endothermic nature of the adsorption process, suggesting that adsorption is a physico-chemical process. The isosteric heats of adsorption indicated energetic heterogeneity of adsorption sites and possible interactions between the adsorbed dye molecules. Kinetic assessment suggests that the adsorption process followed a pseudosecond order model and the rate-limiting step may be the binding of dye onto the adsorbent surface. The diffusion models show that intraparticle diffusion is not the sole rate-limiting step; the external mass transfer also influences the adsorption process in its initial period.

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“…where b (L mg -1 ) is the Langmuir isotherm constant, C 0 (mg L -1 ) is the initial Ni(II) concentration, and the R L values indicate whether the type of isotherm is favorable (Senturk et al 2010). The Langmuir constants can be obtained by plotting C e /q e versus C e .…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Nickel (II) removal using modified Citrus limettioides peel

Ramasamy

Srinivasan

2015

Int. J. Environ. Sci. Technol.

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The Ni(II) adsorption capacity of carbon derived from Citrus limettioides peel (CLP), which is a novel waste material (CLPC), was evaluated regarding contact time, pH and adsorbent dose during batch adsorption processes with raw CLP. The optimal contact time for the adsorption of Ni(II) ions onto the peel and peel carbon was 3 h, and the optimal pH ranged from 5.0 to 8.0 for CLP and 4.0-8.0 for CLPC, respectively. The removal percentage decreased from 85.0 to 70.0 % for CLP and remained nearly constant (99 %) for CLPC when the initial Ni(II) concentration was increased from 10 to 50 mg L -1 . The equilibrium data fit the Langmuir isotherm with a high R 2 value, indicating that the Ni(II) ions formed a homogenous monolayer on the adsorbent surface. Adsorption capacity of Ni(II) ions on peel (CLP) and peel carbon (CLPC) was found to be 25.64 and 38.46 mg g -1 , respectively. The surface morphology and functionality of the CLP and CLPC before and after adsorption were characterized using SEM, EDX and FT-IR. Various thermodynamic parameters, including the standard Gibbs free energy (DG°), standard enthalpy (DH°) and standard entropy (DS°), were evaluated. The CLP and CLPC were tested with Ni(II) plating wastewater through a batch-mode process over five cycles; CLPC showed better results than CLP.

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Biosorption of Rhodamine 6G from aqueous solutions onto almond shell (Prunus dulcis) as a low cost biosorbent

Cited by 181 publications

References 31 publications

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Organic xenobiotics removal in constructed wetlands, with emphasis on the importance of the support matrix

Industrial Cellolignin Wastes as Adsorbent for Removal of Methylene Blue Dye from Aqueous Solutions

Nickel (II) removal using modified Citrus limettioides peel

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