Effect of Physical and Chemical Activation on the Removal of Hexavalent Chromium Ions Using Palm Tree Branches

Khedr, Soheir A.; Shouman, Mona A.; Fathy, Nady A.; Attia, A. A.

doi:10.1155/2014/705069

Cited by 17 publications

(8 citation statements)

References 27 publications

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“…In lower pH range neutralisation of negative charge on the adsorbent surface due to the excess presence of H + ions facilitates the electrostatic attraction between the adsorbate and adsorbent molecule resulting higher percentage of Cr (VI) removal. With increase in solution pH, the decrease in Cr (VI) removal efficiency might be because of competition between OH − and

{CrO}_{4}^{2 -}

ions, where OH − being the dominant one wins the race .…”

Section: Resultsmentioning

confidence: 99%

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Narayan

Meena

Patel

et al. 2015

Env Prog and Sustain Energy

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This study was performed to investigate the latent potential of biomass gasifier waste material (BGWM) as an adsorbent for removal of Cr (VI) from aqueous solution. The present work also proposes an alternate use of gasifier refuge BGWM with great economic feasibility. The effects of initial pH, BGWM concentration, Cr(VI) concentration, temperature and contact time were investigated on the removal of Cr (VI) from aqueous solution. The maximum removal of Cr (VI) was found to be 99.67% at optimum condition of initial pH 2, contact time 80 min, initial Cr (VI) concentration 10 mg L−1, adsorbent dose 5 g L−1, agitation speed 120 rpm, and temperature 35°C. The adsorbent was characterised by SEM, EDX, XRD, BET and FTIR analysis to get important information about its effective application for Cr (VI) removal. The BET surface area of 165.287 m2 g−1 for BGWM was found comparable to that of commercial silica. Batch adsorption experiments showed that pseudo‐second‐order kinetics model and Langmuir isotherm model fitted the adsorption data very well. Thermodynamic parameters revealed the feasibility, spontaneity and endothermic nature of Cr (VI) adsorption onto BGWM. © 2015 American Institute of Chemical Engineers Environ Prog, 35: 95–102, 2016

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{CrO}_{4}^{2 -}

ions, where OH − being the dominant one wins the race .…”

Section: Resultsmentioning

confidence: 99%

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Narayan

Meena

Patel

et al. 2015

Env Prog and Sustain Energy

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“…From Fig. 7c, it can be concluded that the plot of qt versus t 1/2 was not a straight line passing through the origin, suggesting that intraparticle diffusion was not the only mechanism for the overall adsorption process, which also included surface diffusion (Soheir et al 2014).…”

Section: Adsorption Kineticsmentioning

confidence: 96%

Preparation and Adsorption Performance of Cellulose-graft-Polycaprolactone/Polycaprolactone Porous Material

Gu¹,

Li²,

Yang³

et al. 2017

BioResources

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Cellulose-graft-polycaprolactone/polycaprolactone (cell-g-PCL/PCL) was formed by grafting cotton linter pulp with caprolactone via ring-opening polymerization catalyzed by Ti(O-n-Bu)4. The cell-g-PCL/PCL and polycaprolactone (PCL) were used to prepare porous materials (PMs) using solvent exchange and freeze-drying procedures. The obtained PMs were characterized by their porosity, tensile strength, and thermal stability via thermal gravimetric analysis and scanning electron microscopy. The preparation conditions of the cell-g-PCL/PCL PM were optimized based on the characterization results. Compared with PCL PM, cell-g-PCL/PCL PM showed higher porosity and better thermal stability. The adsorptivity of cellg-PCL/PCL PM for the organic pollutant chlorobenzene was greatly improved compared with that of PCL PM. The adsorption processes of both PMs fit well with the Lagergren pseudo-first-order and pseudosecond-order kinetic models. The results of isothermal adsorption simulation indicated that cell-g-PCL/PCL PM and PCL PM fit better with the Langmuir model and Freundlich model, respectively.

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“…Chromium (Cr) is toxic metals and causes severe environmental and public health problems when it gets into natural water from a variety of industrial wastes [1]. Cr is considered as one of the 20 most noxious heavy metals [2].…”

Section: Introductionmentioning

confidence: 99%

“…Tanneries ranked the highest chromium pollutants of all other industries and generate effluents of about 75,000 m 3 / day [6]. In India and Egypt, alone an amount of 2000-3000 and 2000-5000tons of elemental chromium annually escaped into the environment from tanneries and various industries respectively [7,1]. Chromium concentrations from these sources range between 2000 and 5000mg/L in the aqueous effluent, while the limit to discharge into surface water is 2mg/l [6,7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Cactus Biosorption Potential of Cr (VI) ions Removal from Synthetic and Tannery wastewater

Temesgen

Gebrie

2022

Preprint

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Hexachromium Cr (VI) is environmentally mobile and causes ecotoxicological hazard. Chrome utilizing industries are a major source of Cr (VI) pollution. Adsorption using activated carbon prepared from biomaterials is a new technology for the treatment of heavy metals rich industrial effluents. Opuntia Ficus Indicus (OFI) activated with H3PO4 (45%) was evaluated for Cr (VI) removal capability from synthetic and tannery wastewater. The study employed batch experiment and residual Cr (VI) concentrations were analyzed using UV-Vis spectrophotometer. FTIR spectroscopy suggested contributions of hydroxyls and carboxyls in Cr (VI) adsorption. Maximum Cr (VI) removal efficiency of 99.5% was achieved by OFI. The % removal of Cr (VI) onto OFI increased with increase of the amount of sorbent, contact time, agitating speed, while observed increased at lower values of initial concentration of Cr (VI) and PH. Optimized values of sorbent dose, adsorbate concentration, pH, contact time and stirring speed were 0.125g, 6mg/L, 2, 60minuets and 150rpm at a temperature of 250C, respectively. Langmuir isotherm with higher R2 was best fitted to the experimental values with monolayer adsorption capacity of 4.587mg/g. RL values were in range of 0 < RL < 1, confirmed the favorability of adsorption process. About 88.7% Cr (VI) removal was detected when applied to the real wastewater. The reduction in percentage of removal might be due the matrix effect of the competing ions. The study revealed; activated OFI carbon is potent biosorbent of plant origin that holds distinct position for complete removal of Cr (VI)) from aqueous solution.

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Effect of Physical and Chemical Activation on the Removal of Hexavalent Chromium Ions Using Palm Tree Branches

Cited by 17 publications

References 27 publications

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Characterization and application of biomass gasifier waste material for adsorptive removal of Cr (VI) from aqueous solution

Preparation and Adsorption Performance of Cellulose-graft-Polycaprolactone/Polycaprolactone Porous Material

Assessment of Cactus Biosorption Potential of Cr (VI) ions Removal from Synthetic and Tannery wastewater

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