Removal of Fe(II) from the wastewater of a galvanized pipe manufacturing industry by adsorption onto bentonite clay

Tahir, S.S.; Ullah, Shafqat

doi:10.1016/j.jenvman.2004.06.009

Cited by 88 publications

(35 citation statements)

References 18 publications

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“…Different methods have been used to remove iron removal of Fe(II) by chitosan to investigate the from aqueous solutions such as Electrocoagulation [3], adsorption mechanism. Also equilibrium data were ion exchange [4], precipitation [5], extraction [6], analyzed in terms of different isotherm models and model membrane technologies [7], adsorption [8], etc. Cost, parameters were recovered using a nonlinear fit o f complexity and efficiency are important factors that affect experimental data to the model equation.…”

Section: Introductionmentioning

confidence: 99%

Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

Radnia¹

2011

IJEE

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Abstract:In this study removal of Fe(II) by chitosan adsorbent was experimentally investigated in a batch system. The adsorbent dose and pH of the metal solution was fixed at 0.15 g and 4, respectively. Adsorption experiments were carried out at initial concentration range of 10-50 mg lG at 20°C. Equilibrium studies showed 1 that experimental data were well fitted to Langmuir-Freundlich isotherm model. Linear and non-linear forms of pseudo-first-order and pseudo-second-order kinetic models were employed to describe the kinetic adsorption processes. The model parameters were confidently recovered. The kinetics followed the non-linear form of pseudo-first-order model which represents adsorption of Fe(II) on chitosan takes place through a physical process. The examination of kinetic data also revealed that the adsorption rate was dominated by intra-particle diffusion mechanism.Key words: Chitosan % Intraparticle diffusion % Iron removal % Isotherm models % Pseudo-first-order % Pseudo-second-order

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Section: Introductionmentioning

confidence: 99%

Isotherm and Kinetics of Fe(II) Adsorption onto Chitosan in a Batch Process

Radnia¹

2011

IJEE

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“…Bentonite is considered as a main alternative in the decontamination and treatment of detrimental metal ions (Tsai et al 2001;Al-Qunaibit et al 2005;Kaya and Ören 2005;Tahir and Naseem 2004). The adsorption of metal ions on bentonite has been extensively studied in recent years (Caglar et al 2009;Hefne et al 2008;Inglezakis et al 2007;Xu et al 2006;Sato 1998).…”

Section: Introductionmentioning

confidence: 99%

Removal of Cu2+ and Cd2+ from Aqueous Solution by Bentonite Clay Modified with Binary Mixture of Goethite and Humic Acid

Olu-Owolabi

Popoola

Unuabonah

2010

Water Air Soil Pollut

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Pre-modification of bentonite clay with goethite, humic acid, and a binary mixture of goethite and humic acid reagents increased its cation exchange capacity from 95 to 105.32, 120.4, and 125.8 meq/ 100 g of bentonite clay, respectively. The effective pre-modification of bentonite clay with goethite, humic acid, and goethite-humic acid reagents was confirmed from their Fourier transform infrared spectra which suggested that modification was effective on the AlAlOH and Si-O sites for goethite and humic acid modification and AlAlOH for goethitehumic acid modification. The presence of 0.001 M NaNO 3 electrolyte increased the adsorption capacity of bentonite clay. Temperature was observed to favor the adsorption of Cu 2+ and Cd 2+ onto both the raw and modified bentonite clay samples. The goethitehumic acid-modified bentonite gave the best adsorption capacity of ≈10 and 16 mg/g at 30 and 50°C, respectively, for both metal ions. The inner sphere complexation mechanism was suggested for the adsorption of both metal ions onto the modified adsorbents. Modifying bentonite clay with a binary mixture of goethite and humic acid reduced the selectivity of bentonite clay for either Cu 2+ or Cd 2+ . Preadsorbed goethite and humic acid on bentonite clay will further reduce the mobility of heavy metal ions in soils and in aquatic environments.

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“…This sediment is the oxidized or ferric form of iron that will not dissolve in water. There are several methods for removal of iron from drinking water like ion exchange and water softening (Vaaramaa and Lehto, 2003), activated carbon and other filtration materials (Munter et al, 2005), bioremediation (Berbenni et al, 2000), oxidation by aeration, chlorination, ozonation followed by filtration (Ellis et al, 2000), by ash (Das et al, 2007), by aerated granular filter (Cho, 2005) and by adsorption (Tahir and Rauf, 2004).…”

Section: Introductionmentioning

confidence: 99%