Removal of Cr(VI) from aqueous solutions using modified red pine sawdust

Göde, Fethiye; Atalay, Elif; Pehlivan, Erol

doi:10.1016/j.jhazmat.2007.07.104

Cited by 87 publications

(36 citation statements)

References 41 publications

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“…2). At lower pH than 8, the dominant forms of nickel was Ni 2+ ; while at pH more than 8, Ni(OH) 2 were present as precipitate [19]. Whereas Cu(OH) 2 will be the dominant species at pH more than pH 6 [20].…”

Section: B Effect Of Phmentioning

confidence: 93%

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Rozaini¹,

Jain²,

Oo³

et al. 2010

IJCEA

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Abstract-Mangrove barks Rhizophora apiculata which have been chemically modified in basic condition were used as adsorbent for the removal of nickel and copper ions from aqueous solution. The adsorbent was characterized by SEM images, FT-IR and BET analysis. Effecting parameters like initial pH, initial concentrations of metal ions and contact time were investigated. The adsorption data were well fitted by Freundlich isotherm model. Kinetic data were best described by pseudo-second-order model. Thermodynamic studies showed spontaneous and exothermic nature in the adsorption of Ni(II) and Cu(II) ions by the modified mangrove barks.

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Section: B Effect Of Phmentioning

confidence: 93%

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Rozaini¹,

Jain²,

Oo³

et al. 2010

IJCEA

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“…Discharging of metals into water resources is one of the most critical issues regarding pollution which may have negative effects on the quality of water supply. Increasing concentrations of heavy metals in water resources have negative effects on the quality of water and have caused severe threats to the health of humankind, which are mainly related to their non-degradability and toxicity (Gode et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Chromium(VI) adsorption from aqueous solution by prepared biochar from Onopordom Heteracanthom

Ghorbani-Khosrowshahi

Behnajady

2016

Int. J. Environ. Sci. Technol.

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In this research, the stems of Onopordom Heteracanthom which is a kind of weed were converted to biochar particles, and their characteristics were investigated. The morphology and purity of these particles were examined by SEM and EDX techniques, respectively. Specific surface area was obtained as 5.73 m 2 g -1 by BET method. The biochar particles obtained from Onopordom Heteracanthom were evaluated as an adsorbent to remove Cr(VI) from aqueous environments. The effect of some parameters such as initial concentration of Cr(VI), dosage of adsorbent, and pH were investigated on the adsorption capacity of Cr(VI) onto the adsorbent. The equilibrium data were analyzed by various isotherm models. The results revealed that in this process, the adsorption isotherm and kinetics have more conformity with Langmuir isotherm and pseudo-second-order kinetics, respectively. The multilinearity of the Weber and Morris adsorption kinetic model indicates that the intra-particle diffusion is not merely the rate-controlling step for the whole adsorption process.

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“…The adsorption peak at 3417 cm -1 indicates the hydroxyl groups and the contribution from C-H stretching, respectively (Nakkeeran et al, 2016a). The band at 2354 cm −1 is assigned to stretching vibrations of N-H or C=O groups probably due to amines and ketones, 1642 cm −1 is an indication of COO, C=O, and can also indicate the bending vibration of adsorbed water (Rangabhashiyam., 2015a), 1030 cm −1 is stretching vibration of C-O-C and O-H of polysaccharides in sawdust (Gode et al, 2008). The absorption peak at 1416 cm −1 could be assigned to CO2 stretching vibration (carbon dioxide from the atmosphere, perhaps due to the mesoporous nature of Ag2O nanomaterials).…”

Section: Fourier Transform Infrared Spectroscopy (Ft-ir) Spectroscopymentioning

confidence: 99%

Preparation and application of silver oxide/sawdust nanocomposite for Chromium(VI) ion removal from aqueous solutions using column system

2017

Global NEST Journal

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This study describes the removal of Cr (VI) ions from aqueous solutions using silver oxide/sawdust nanocomposite (Ag2O/SD NC) that was prepared using the chemical precipitation method. Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FT-IR) techniques were used for characterization of Ag2O/SD NC. The effect of various parameters such as feed solution pH (2, 6, and 10), influent concentration of Chromium (VI) (25-100 mg/L), flow rate (1-5 mL/min) and bed depth (4-12 cm) on breakthrough curves (BTC) were investigated. Three wellknown column adsorption kinetics models including Thomas, Adams-Bohart and Bed Depth Service Time (BDST) models were applied to fitting the column experimental data. Based on Thomas model, the equilibrium adsorption reached 13.41 mg/g when a Cr (VI) polluted solution with influent concentration of 25 mg/L Cr (VI) passed through the column with a flow rate of 2 mL/min. Desorption studies reveal that recovery of uploaded Cr (VI) from the Ag2O/SD NC adsorbent or exhausted column regeneration can readily be achieved using a dilute solution of NaOH (0.01 M) as eluent. This study indicated that the Ag2O/SD NC can be used as an effective, efficient and environmentally friendly adsorbent for the removal of Cr (VI) ions from water resources.

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Removal of Cr(VI) from aqueous solutions using modified red pine sawdust

Cited by 87 publications

References 41 publications

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Optimization of Nickel and Copper Ions Removal by Modified Mangrove Barks

Chromium(VI) adsorption from aqueous solution by prepared biochar from Onopordom Heteracanthom

Preparation and application of silver oxide/sawdust nanocomposite for Chromium(VI) ion removal from aqueous solutions using column system

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