Adsorption of chromium ion (VI) by acid activated carbon

Attia, A. A.; Khedr, Soheir A.; Elkholy, S. A.

doi:10.1590/s0104-66322010000100016

Cited by 150 publications

(65 citation statements)

References 24 publications

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“…The intraparticle diffusion model is applicable in cases where intraparticle diffusion was the rate-limiting step (Attia et al 2010). If the rate-limiting step is intraparticle diffusion, a plot of solute adsorbed against square root of contact time should yield a straight line passing through the origin (Weber and Morris 1963).…”

Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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Both the effect of particle size and initial concentration on the adsorption of lead by sawdust of two timber species were investigated using batch experimental equilibrium and kinetic studies. A 100% lead removal efficiency was recorded for the optimum particle size of 1.18 mm for Pycnanthus angolensis and 0.85 mm for Khaya ivorensis at an initial lead concentration of 10 mg/L. Freundlich isotherm (0.83 ≤ R 2 ≤ 0.96 for Khaya ivorensis and 0.94 ≤ R 2 ≤ 1.0 for Pycnanthus angolensis) performed better than Langmuir and Temkin isotherms. The Dubinin-Radushkevich isotherm was used to ascertain the sorption mechanism. Mean sorption energy (12.48 kJ/mol for Pycnanthus angolensis and 13.42 kJ/mol for Khaya ivorensis) indicated that adsorption was by ion exchange. The pseudo-first order kinetic model (0.96 ≤ R 2 ≤ 1.0 for Khaya ivorensis and 0.90 ≤ R 2 ≤ 1.0 Pycnanthus angolensis) performed better than others with respect to R 2 values, while the intraparticle diffusion model performed better than the other kinetic models with respect to absolute mean error (AME).

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Section: Fig 8b Temkin Isotherm For Khaya Ivorensismentioning

confidence: 99%

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Nnaji

Emefu

2017

BioResources

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“…For single solute systems, Langmuir and Freundlich isotherm are the most widely used adsorption models [27][28][29].…”

Section: Modelingmentioning

confidence: 99%

“…When the monolayer is saturated, the maximum adsorption occurs. In addition the model assumes that the adsorbate molecules cannot migrate on the adsorbent surface, the energy of adsorption being constant [27][28][29]. The linear form of Langmuir isotherm is described by the Equation (2): e e e L m m…”

Section: Modelingmentioning

confidence: 99%

Heavy metal removal from waste waters by phosphonate metal organic frameworks

Maranescu

Lupa

Visa

2017

Pure and Applied Chemistry

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Abstract:The increase attention in the area of phosphonate metal organic framework is exemplified with a variety of applications and a rich chemistry of these compounds. Water pollution caused by heavy metal ions is a major concern due to their toxicity to many life forms. In order to decrease the heavy metals impact upon the environment various technologies of water treatment such as: chemical sedimentation, ion exchange, redox process are studied. The tendency is to find a versatile and economical method of heavy metals removal from waste waters. Phosphonate metal organic frameworks were obtained by the reaction of Ni(CH 3 COO) 2 · 4H 2 O, phosphonic acid (phosphonoacetic (CP), vinyl phosphonic acid (VP) and N,N-bis(phosphonomethyl)glycine (Gly)) in hydrothermal conditions. Coordination polymers synthesized were characterized by FTIR, XRD, scanning electron microscopy (SEM) and thermal gravimetric analysis (TGA). The adsorption processes represent a very good alternative for heavy metals removal due to low costs and ease of operation. In the present paper the adsorption performance of the mentioned materials in the removal process of heavy metals from aqueous solutions, was studied using the batch method. The adsorption conditions were investigated by varying the initial pH, contact time and adsorbate initial concentration for chromium metal ions removal from aqueous solutions. It was found that the adsorption efficiency of the studied materials in the removal process of Cr(VI) ions from aqueous solutions is in the following order: Ni-CP < Ni-Gly ≤ Ni-VP.

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“…Activated carbon is a widely used adsorbent for air purifi cation from harmful gases, such as SO 2 , СО 2 [2] and it is also used as a catalyst for the oxidation of SO 2 to SO 3 [3]. AC is known to be also used for wastewater treatment from heavy metals and their compounds (Cr(VI), Cu(II), Ni(II), Pb(II), Hg [4][5][6]), from organic compounds (diphenyl, phenol and chlorinated organic compounds [7][8][9]). …”

Section: Introductionmentioning

confidence: 99%

Benzoyl Peroxide Decomposition by Nitrogen-Containing Carbon Nanomaterials

Haliarnik¹,

Petuhov²,

Bakalinska³

et al. 2016

ChemJMold

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Abstract. In this paper the determination of catalytic activities of nanoporous KAU and SKN carbon materials, as well as catalytic activities of their modifi ed (oxygen-and nitrogen-containing) forms and of enzyme catalase by calculating the Michaelis constants according to the kinetics of substrate decomposition has been reported. It has been shown that nitrogen-containing materials provide the highest catalytic activity in non-aqueous media, while the activity of catalase in non-aqueous media is small. It has been established that the catalytic activity of the samples does not correlate with structural parameters but depends on the change of their surface chemistry. The catalytic activity is decreased by the addition of oxygen atoms and, vice-versa, is increased by addition of nitrogen atoms. It has been found that the catalytic activity of studied samples correlates with surface basicity as well as the presence of quaternary nitrogen in the chemical structure.

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Adsorption of chromium ion (VI) by acid activated carbon

Cited by 150 publications

References 24 publications

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Effect of Particle Size on the Sorption of Lead from Water by Different Species of Sawdust: Equilibrium and Kinetic Study

Heavy metal removal from waste waters by phosphonate metal organic frameworks

Benzoyl Peroxide Decomposition by Nitrogen-Containing Carbon Nanomaterials

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