Sorption equilibrium of Cr(VI) ions on oak wood charcoal (Carbo Ligni) and charcoal ash as low-cost adsorbents

Pehlivan, Erol; Kahraman, Havva Tutar

doi:10.1016/j.fuproc.2010.08.021

Cited by 43 publications

(30 citation statements)

References 48 publications

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“…Optimum pH is crucial as it affects not only the surface charges but also the ionic forms of the solute in water [21]. Cr ), a dimer of HCrO 4 − minus a water molecule forms when the concentration of chromium exceeds approximately 1 g/L [22].…”

Section: Determination Of Point Of Zero Charge (Ph Pzc ) and Optimum Phmentioning

confidence: 99%

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Biosorption - a case study of hexavalent chromium removal with raw pomegranate peel

Salam¹,

Anantharaman²

2019

DWT

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Biosorptive removal of heavy metals from water is an eco-friendly green technology. In this study, raw pomegranate (Punicagranatum L.) peel (RPP), without any modification or activation, was used as biosorbent for the removal of chromium (Cr(VI)). The influence of operating parameters such as pH, contact time, temperature and concentration of Cr(VI) were studied in batch mode. A maximum removal of 100% was achieved for a Cr(VI) solution of concentration 20 mg/L at an optimum pH and temperature of 2 and 313 K respectively in 3 min. Among the isotherms tested, Langmuir adsorption isotherm has good correlation with experimental data. A maximum Cr(VI) biosorption capacity of 370.4 mg/g was observed at 313K under equilibrium conditions. RPP is also effective in the removal of Cr(VI) at higher concentrations. Among the kinetic models, pseudo-second order kinetic model fits the data well. The thermodynamic study reveals that the endothermic biosorption taking place on RPP is physico-chemical in nature. The biosorption mechanism of RPP with Cr(VI) indicates that intra-particle diffusion is not the only rate limiting step and film diffusion also plays a major role in biosorption.

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Section: Determination Of Point Of Zero Charge (Ph Pzc ) and Optimum Phmentioning

confidence: 99%

“…(18) can be rearranged to 20is used for finding the effective diffusion coefficient, D i (m 2 /g) of the solute in the sorbent phase with the help of Eq. (21). 'r' is the radius of the adsorbent particles.…”

Section: Boyd Modelmentioning

confidence: 99%

Biosorption - a case study of hexavalent chromium removal with raw pomegranate peel

Salam¹,

Anantharaman²

2019

DWT

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“…The isotherm giving an R 2 value closest to unity was deemed to provide the best fit. The Freundlich model has contained two useful parameters (k and n) [32,33]. The Langmuir isotherm model has two parameters (K b and A s ).…”

Section: The Effect Of Initial Cr(vi) Concentrationmentioning

confidence: 99%

Removal of chromium (VI) using activated carbon-supported-functionalized carbon nanotubes

et al. 2015

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The powdered activated carbon (AC) supported by carbonaceous nano-adsorbents were examined to remove hexavalent chromium [Cr(VI)] from aqueous solution The adsorption behaviour of micro-level concentration of Cr(VI) on those nano-adsorbents was investigated as a function of the experimental conditions such as the contact time, the pH, the dosage of adsorbent, and the initial concentration of Cr(VI). The structural characterization of the adsorbents was accomplished by Fourier transform infrared spectroscopy and scanning electron microscopy. Adsorption isotherms including Freundlich and Langmuir have been applied to study the equilibrium of the adsorption behaviour and identify the adsorption capacity of the activated carbon-functionalized multiwalled carbon nanotubes (AC/f-MWCNTs) and activated carbon-functionalized carbon nanospheres (AC/f-CNSs). Langmuir isotherm model showed that the adsorption process was monolayer type under working with an adsorption capacity of 113.29 and 105.48 mg/g, respectively, for AC/f-MWCNTs and (AC/f-CNSs).

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“…On the other hand, a decrease in the chromium ion uptake (q e ) was observed with an increase of fly ash dose. The decrease in chromium ion uptake (q e ) may be due to the availability of lesser number of Cr(VI) ions per unit mass of the fly ash due to which the active sites may remain unsaturated during the adsorption process [16,38].…”

Section: Effect Of Adsorbent (Fly Ash) Dosementioning

confidence: 99%

Removal of hexavalent chromium from aqueous solution using biomass derived fly ash from Waste-to-Energy power plant

Vaid

Mittal

Babu

2014

Desalination and Water Treatment

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A B S T R A C TFly ash from the agricultural waste-based Energy Power Plant has been studied for the adsorption of hexavalent chromium [Cr(VI)]. In order to maximize the Cr(VI) removal from simulated aqueous solutions, effects of various parameters i.e. adsorbent dose (10-40 g/L), contact time (5-90 min), variation in pH (1-5), and initial metal ion concentration (10-80 mg/ L) on Cr(VI) adsorption were investigated by batch adsorption experiments. It was observed that adsorption of Cr(VI) on the selected adsorbent was dependent on pH. Before optimization of experimental conditions, the percent removal of Cr(VI) from the aqueous solution (10 mg Cr/L) was approximately 4%, which increased to approximately 99% after optimization of experimental conditions. Maximum adsorption was observed upon adding 10 g/L of adsorbent to a 60 mg Cr/L aqueous solution at pH 1.0 and contact time of 90 min at 200 rpm. Equilibrium adsorption data were well fitted in Langmuir isotherm model which substantiate monolayer adsorption of Cr(VI) on fly ash. Kinetics of Cr(VI) adsorption on fly ash follows pseudo-second-order reaction.

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Sorption equilibrium of Cr(VI) ions on oak wood charcoal (Carbo Ligni) and charcoal ash as low-cost adsorbents

Cited by 43 publications

References 48 publications

Biosorption - a case study of hexavalent chromium removal with raw pomegranate peel

Biosorption - a case study of hexavalent chromium removal with raw pomegranate peel

Removal of chromium (VI) using activated carbon-supported-functionalized carbon nanotubes

Removal of hexavalent chromium from aqueous solution using biomass derived fly ash from Waste-to-Energy power plant

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