Adsorption of hexavalent chromium from aqueous solutions by bio-chars obtained during biomass pyrolysis

Deveci, Hüseyin; Kar, Yakup

doi:10.1016/j.jiec.2012.08.001

Cited by 149 publications

(63 citation statements)

References 43 publications

(45 reference statements)

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“…4 that at pH values higher than 7, Cr(VI) removal by DPB is not satisfactory. The lower adsorption capacity at pH>7 can be explained by increasing competition with the OH − ions and by the presence of CrO 4 2− species which have a different charge to Cr-atoms ratio than the Cr 2 O 7 2− and HCrO 4 − species presence at acidic pH. As reported by others [3], the effect of specific pH level of a solution can be attributed to the electrostatic interactions between the Cr(VI) species present in the solution and the DPB surface, and also to the specific selection of an DPB for the Cr(VI) species.…”

Section: Impact Of Solution Phmentioning

confidence: 99%

“…Fig. 7 shows the effect of co-existing ions Cl − , NO 3 − , SO 4 2− , PO 4 3− , and HCO 3 − on Cr(VI) adsorption by DPB. The experiments, which were carried out as binary systems with fixed Cr(VI) ion concentration of 100 mg/L.…”

Section: Impact Of Co-existing Anionsmentioning

confidence: 99%

“…Cl − and NO 3 − , clearly have no significant impact on Cr(VI) adsorption as these ions (Cl − and NO 3 − ) have low-affinity ligands [54]. When PO 4 3− and SO 4 2− existed in the system, there was a decrease in Cr(VI) adsorption from the aqueous solution. This may be due to the competition effect between the anions and chromate for the adsorption sites [55].…”

Section: Impact Of Co-existing Anionsmentioning

confidence: 99%

“…Industrial wastewaters from the electroplating and metallurgy, leather tanning, dye, metal finishing, and textile contain chromium [1,2]. Hexavalent chromium species, Cr(VI), is a highly toxic metal, considered as a priority pollutant because of its carcinogen, mutagen, and teratogen properties [3,4]. Therefore, environmental regulations require reducing the Cr(VI) concentration in wastewater to below 0.1 mg/L prior to discharge into the environment [3,5].…”

Section: Introductionmentioning

confidence: 99%

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Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

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Abstract−This work introduces a biochar as novel adsorbent prepared from the dew melon peel by pyrolysis method, and demonstrates its potential for eliminating Cr(VI) from simulated and actual wastewaters. The dew melon peel biochar (DPB) was characterized by several techniques and methodologies such as, BET, SEM, FTIR, Boehm titration, ultimate analysis, and pHzpc. DPB is a microporous material with the BET specific surface area of 196 m 2 /g. The effects of different parameters including pH, amount of adsorbent, Cr(VI) concentration, and mixing time on the removal of Cr(VI) from wastewater were studied. Maximum adsorption (98.6%) was observed at pH 6 and 100 mg/L metal concentration. The equilibrium adsorption was analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. Kinetic data were evaluated by pseudo-first order, pseudo-second order, intraparticle diffusion, film diffusion (Boyd), Elovich, and Avrami models. The kinetic data were best fitted to the pseudo-second order model. The Langmuir isotherm model gives the better correlation to predict the adsorption equilibrium, with a maximum adsorption capacity of 198.7 mg/g. The thermodynamic parameters showed that the adsorption of Cr(VI) was endothermic and spontaneous. Competition between the co-existing ions of Cl − , NO 3 − , SO 4 2− , PO 4 3− , and HCO 3 − on the adsorption process was studied. The efficacy of DPB was successfully examined by analyzing the removal of Cr(VI) from two industrial wastewaters. The results indicate that DPB is promising as an effective and economical adsorbent for Cr(VI) ions removal and could be repeatedly used with no significant loss of adsorption efficiency.

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Section: Impact Of Solution Phmentioning

confidence: 99%

Section: Impact Of Co-existing Anionsmentioning

confidence: 99%

Section: Impact Of Co-existing Anionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

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“…In recent decades, a lot of measures have been carried out for the removal of Cr(VI) ions from the environment. Among the various methods, adsorption is regarded as an efficient, versatile and cost-effective method for the Cr(VI) ions removal [2].…”

Section: Introductionmentioning

confidence: 99%

Chitosan/Graphene/TiO2 Composites: Preparation and Its Application for Removal of Cr(VI)

Zhao¹,

Yu²,

Qiu³

et al. 2015

Proceedings of the 2015 International Forum on Energy, Environment Science and Materials

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Abstract. In this work, chitosan/graphene/TiO 2 (CS/GR/TiO 2 ) composites for the removal of Cr(VI) was prepared and characterized by FT-IR, XRD, Raman spectroscopy, TEM, SEM and N 2 adsorption-desorption measurements. The composites could retain large specific surface area of graphene, the mesoporous structure of TiO 2 and the original function of chitosan. The optimum adsorption conditions for CS/GR/TiO 2 composites were investigated. Kinetic data was well fitted by pseudo second-order model. Thermodynamic study indicated that the adsorption process is spontaneous and exothermic. The obtained results indicated that the prepared CS/GR/TiO 2 composites has potential application for the wastewater treatment containing Cr(VI).

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Performance of Fe‐loaded chitosan carbonized rice husk beads (Fe‐CCRB) for continuous adsorption of metal ions from industrial effluents

Sugashini

Begum

2013

Env Prog and Sustain Energy

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The present investigation elucidates the removal of heavy metal ions using Fe‐loaded chitosan carbonized rice husk beads—Fe‐CCRB from synthetic and industrial effluent in a fixed bed column. The surface properties of Fe‐CCRB were characterized by Brauner Emmet and Teller (BET) analyzer, Scanning Electron Microscopy (SEM), Energy Dispersive X‐ray Analysis (EDAX) and Fourier transform infrared spectroscopy (FTIR). The effects of process parameters such as flow rate, bed height and initial Cr (VI) concentration were studied to determine the break through time. The experimental data fitted well with Thomas model and Yoon Nelson model. The break through curve of Adam Bohart model fitted with initial part of the breakthrough curve of experimental data. The BDST model described the adsorption capacity of the bed per unit bed volume N0 increased with increase in Ct/C0. Regeneration studies were attempted to check the stability and activity of the adsorbent. The Fe‐CCRB adsorbent was used to treat the effluents and it was found to be more efficient in adsorption of anionic pollutant Cr (VI) ions when compared to cationic pollutant Ni (II) and Zn (II) with the maximum percentage removal of Cr(VI), Ni(II), and Zn(II) was 82.4, 63.1, and 77.2%, respectively. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 1125–1138, 2014

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Adsorption of hexavalent chromium from aqueous solutions by bio-chars obtained during biomass pyrolysis

Cited by 149 publications

References 43 publications

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Chitosan/Graphene/TiO2 Composites: Preparation and Its Application for Removal of Cr(VI)

Performance of Fe‐loaded chitosan carbonized rice husk beads (Fe‐CCRB) for continuous adsorption of metal ions from industrial effluents

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