Removal of mixed heavy metal ions in wastewater by zeolite 4A and residual products from recycled coal fly ash

Hui, K.S.; Chao, Christopher Yu Hang; Kot, Sc C.

doi:10.1016/j.jhazmat.2005.06.027

Cited by 635 publications

(323 citation statements)

References 51 publications

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“…The Langmuir sorption isotherm is the best known of all isotherms describing sorption (Hui et al 2005;Langmuir 1918) and is based on assumptions:…”

Section: Langmuir Isotherm Modelmentioning

confidence: 99%

“…Most of these methods suffer from some drawbacks such as high capital and operational costs as well as the problem of the disposal of residual metal sludge (Hui et al 2005). However, adsorption has been found to be superior to other techniques for wastewater treatment in terms of initial cost, simplicity of design, ease of operation and insensitivity of toxic substances (Mahmoodi et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Ghasemi

Zahedi

et al. 2014

Int. J. Environ. Sci. Technol.

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In this study, the adsorption behavior of Ni(II) in an aqueous solution system using natural adsorbent Peganum harmala-L was measured via batch mode. The prepared sorbent was characterized by scanning electron microscope, Fourier transform infrared spectroscopy, N 2 adsorptiondesorption and pH zpc . Adsorption experiments were carried out by varying several conditions such as contact time, metal ion concentration and pH to assess kinetic and equilibrium parameters. The equilibrium data were analyzed based on the Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms. Kinetic data were analyzed using the pseudo-firstorder, pseudo-second-order and intra-particular diffusion models. Experimental data showed that at contact time 60 min, metal ion concentration 50 mg/L and pH 6, a maximum amount of Ni(II) ions can be removed. The experimental data were best described by the Langmuir isotherm model as is evident from the high R 2 value of 0.988. The adsorption capacity (q m ) obtained was 68.02 mg/g at an initial pH of 6 and a temperature of 25°C. Kinetic studies of the adsorption showed that equilibrium was reached within 60 min of contact and the adsorption process followed the pseudo-first-order model. The obtained results show that P. harmala-L can be used as an effective and a natural low-cost adsorbent for the removal of Ni(II) from aqueous solutions.

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“…The Langmuir sorption isotherm is the best known of all isotherms describing sorption (Hui et al 2005;Langmuir 1918) and is based on assumptions:…”

Section: Langmuir Isotherm Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Ghasemi

Zahedi

et al. 2014

Int. J. Environ. Sci. Technol.

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show abstract

“…Meanwhile, fly ash had a large specific surface area and solid adsorbent performance [5] . Studies had shown that fly ash and synthetic materials had a better ability to remove ability for heavy metal ions in water [6,7] . However, most research had focus on a single heavy metal ion adsorption [8][9][10] , and the competitive adsorption of mixed heavy metal ions were not comprehensive enough [7] .…”

Section: Introductionmentioning

confidence: 99%

“…Studies had shown that fly ash and synthetic materials had a better ability to remove ability for heavy metal ions in water [6,7] . However, most research had focus on a single heavy metal ion adsorption [8][9][10] , and the competitive adsorption of mixed heavy metal ions were not comprehensive enough [7] . In this paper, the synthesis of zeolite from fly ash was used as adsorbent for the competitive adsorption of mixed heavy metals of Pb and Ni.…”

Section: Introductionmentioning

confidence: 99%

Competitive Adsorption Properties of Heavy Metals Lead and Nickel by Synthetic Zeolite

Chen¹,

Cheng²,

Zhang³

et al. 2017

dtetr

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*Batch experiments were conducted to study the competitive adsorption effect of Pb2+and Ni2+ ions through synthesizing zeolite. Some influencing factors were investigated to discuss the competitive adsorption effect of mixed heavy metals. The adsorption kinetic modes for the competitive adsorption of Pb2+and Ni2+ ions were also investigated. The results showed that, the adsorption efficiency of Pb2+and Ni2+ ions was increased with the increasing of zeolite dosage, while the saturated adsorption capacity was decreased gradually. The competitive adsorption order was Pb>Ni in mixed heavy metals during the whole adsorption process. In acidic environment, the Pb2+ adsorption inhibited the adsorption of Ni2+ in mixed heavy metals. The adsorption efficiency of Pb2+and Ni2+ ions was increased continuously with the rise of temperature and the prolonging of reaction time. The adsorption efficiency of Pb2+ ions was higher than that of the Ni2+ ions in different reaction temperature. The adsorption kinetics of Pb2+ and Ni2+ ions on zeolite were matched to the pseudo-second order adsorption model.

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“…Fly ash has potential use in wastewater treatment because of its major chemical components, which are alumina, silica, ferric oxide, calcium oxide, magnesium oxide and carbon, and its physical properties such as porosity, particle size distribution and surface area. As a technique for recycling fly ash, synthesis of zeolite from coal fly ash has attracted a great deal of attention [6,7]. Therefore, the synthesis of zeolite will be a successful alternative to deal with fly ash waste, resulting in low-cost and environmentally friendly materials.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Lead Ions by Linde type F(K) Zeolite

Han¹,

Chen

Cheng³

et al. 2016

MATEC Web Conf.

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Abstract. The Test was to examine the adsorption property of Pb( ) irons by Linde type F (K) zeolite. The zeolite was synthesized by fly ash. The adsorbent dosage, pH, reaction temperature and reaction time were investigated. The adsorption isotherm and adsorption kinetics equation were studied. The results showed the adsorbent dosage, pH, reaction temperature and reaction time had significant effects on the adsorption of Pb( ) irons. The removal rate was improved with the increasing of zeolite dosage. The saturated adsorption capacity was decreased gradually. The adsorption of Pb( ) irons tended to saturate when initial pH was 6. With the increasing of temperature, the equilibration time of adsorption was shorter. Langmuir isotherm was more applicable to explain the monolayer adsorption procedure of Pb( ) on Linde type F(K) zeolite. For adsorption kinetics, pseudo-second order model showed better calculation results.

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Removal of mixed heavy metal ions in wastewater by zeolite 4A and residual products from recycled coal fly ash

Cited by 635 publications

References 51 publications

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Kinetic and equilibrium study of Ni(II) sorption from aqueous solutions onto Peganum harmala-L

Competitive Adsorption Properties of Heavy Metals Lead and Nickel by Synthetic Zeolite

Adsorption of Lead Ions by Linde type F(K) Zeolite

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