Adsorption of heavy metal cations by Na-clinoptilolite: Equilibrium and selectivity studies

Mihaly‐Cozmuta, Leonard; Mihaly‐Cozmuta, Anca; Peter, Anca; Nicula, Camelia; Tutu, Hlanganani; Silipas, D. T.; Indrea, Emil

doi:10.1016/j.jenvman.2014.02.007

Cited by 113 publications

(64 citation statements)

References 23 publications

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“…Many parameters may be responsible for the observed selectivity, such as the characteristics of zeolites and heavy metal ions (Hui et al 2005;Mihaly-Cozmuta et al 2014). Generally, zeolites are weakly acidic in nature and, therefore, sodium form exchangers are selective for hydrogen.…”

Section: Adsorption Isotherms Of Heavy Metals In Single-heavy and Mulmentioning

confidence: 99%

“…This leads to high pH values of the solutions, making feasible the metal hydroxide precipitation (Leinonen and Lehto 2001). The characteristics of heavy metal ions, such as hydrolysis constant, dehydration energy, and hydrated radii, were summarized in Table 5 (Hui et al 2005;Mihaly-Cozmuta et al 2014;Semmens and Seyfarth 1978;Volkov et al 1997). The metal ions with higher dehydration energy, hydrolysis constant, and larger hydrated radii were preferred to remain in the solution phase.…”

Section: Adsorption Isotherms Of Heavy Metals In Single-heavy and Mulmentioning

confidence: 99%

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Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Chen

Tang

et al. 2015

Environ Sci Pollut Res

187

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Zeolite was synthesized from coal fly ash by a fusion method and was used for the removal of heavy metal ions (Pb(2+), Cd(2+), Cu(2+), Ni(2+), and Mn(2+)) in aqueous solutions. Batch method was employed to study the influential parameters such as adsorbent dosage, pH, and coexisting cations. Adsorption isotherms and kinetics studies were carried out in single-heavy and multiheavy metal systems, respectively. The Langmuir isotherm model fitted to the equilibrium data better than the Freundlich model did, and the kinetics of the adsorption were well described by the pseudo-second-order model, except for Cd(2+) and Ni(2+) ions which were fitted for the pseudo-first-order model in the multiheavy metal system. The maximum adsorption capacity and the distribution coefficients exhibited the same sequence for Pb(2+) > Cu(2+) > Cd(2+) > Ni(2+) > Mn(2+) in both single- and multiheavy metal systems. In the end, the adsorption capacity of zeolite was tested using industrial wastewaters and the results demonstrated that zeolite could be used as an alternative adsorbent for the removal of heavy metal ions from industrial wastewater.

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Section: Adsorption Isotherms Of Heavy Metals In Single-heavy and Mulmentioning

confidence: 99%

Section: Adsorption Isotherms Of Heavy Metals In Single-heavy and Mulmentioning

confidence: 99%

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Chen

Tang

et al. 2015

Environ Sci Pollut Res

187

View full text Add to dashboard Cite

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“…These processes are generally due to a cation exchange reaction between adsorbent and adsorbate related to a mass-transport process or particle diffusion in macropores or micropores [25]. Pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models are presented to describe and support the adsorption kinetic behavior of AgNPs.…”

Section: Theoretical Modelsmentioning

confidence: 99%

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Ruíz-Baltazar

Pérez

2015

Applied Sciences

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Abstract:In this research, the adsorption capacity of Ag nanoparticles on natural zeolite from Oaxaca is presented. In order to describe the adsorption mechanism of silver nanoparticles on zeolite, experimental adsorption models for Ag ions and Ag nanoparticles were carried out. These experimental data obtained by the atomic absorption spectrophotometry technique were compared with theoretical models such as Lagergren first-order, pseudo-second-order, Elovich, and intraparticle diffusion. Correlation factors R 2 of the order of 0.99 were observed. Analysis by transmission electron microscopy describes the distribution of the silver nanoparticles on the zeolite outer surface. Additionally, a chemical characterization of the material was carried out through a dilution process with lithium metaborate. An average value of 9.3 in the Si/Al ratio was observed. Factors such as the adsorption behavior of the silver ions and the Si/Al ratio of the zeolite are very important to support the theoretical models and establish the adsorption mechanism of Ag nanoparticles on natural zeolite.

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“…Another advantage of adsorption is that there is no secondary sludge pollution, and this means not having to invest in infrastructure and sludge-related operations (Semerjian 2010). To date, numerous materials as potential adsorbents for the sequestration of hazardous heavy metals have been studied, such as bottom fly ash (Khan et al 2009), sawdust (Semerjian 2010), peanut husk charcoal (Shang et al 2015), clinoptilolite (Mihaly-Cozmuta et al 2014), chemically modified orange peel (Lasheen et al 2012), poly(amidoamine)-modified graphene oxide (Yuan et al 2013), magnetic Fe 3 O 4 functionalized with EDTA , and carbon nanotubes/silica nanoparticles (Saleh 2015b). Some adsorbents may be low cost, but removal efficiency is poor from a practical perspective.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of aqueous Pb(II), Cu(II), Zn(II) ions by amorphous tin(VI) hydrogen phosphate: an excellent inorganic adsorbent

Zhu

Dong

Chen

et al. 2016

Int. J. Environ. Sci. Technol.

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Amorphous tin(VI) hydrogen phosphate (ATHP) was synthesized using the liquid phase precipitation method and served as an adsorbent to remove Pb(II), Cu(II), and Zn(II) from aqueous solutions. The ATHP was characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption-desorption techniques. Adsorption properties were evaluated as a function of pH, reaction time, concentration of reactants, and salinity. Their equilibrium adsorption data were modeled using Freundlich, Langmuir, and Dubinin-Kaganer-Radushkevich isotherms, respectively. The results revealed that adsorption equilibrium reached within 180 min. ATHP indicated good adsorption even below the pH ZPC , and best adsorption at pH 5 for Pb(II) and Cu(II) and at pH 5.5 for Zn(II) was observed. Equilibrium data fitted better to the Langmuir model for Pb(II) and Cu(II) and fitted better to the Freundlich model for Zn(II). The saturated adsorption capacities deduced from the Langmuir model were 2.425, 1.801, and 0.600 mmol/ g for Cu(II), Pb(II), and Zn(II), respectively, indicating an adsorption affinity order of Cu [ Pb [ Zn. There is a negative correlation between the concentration of NaCl and adsorption capacity of ATHP, yet ATHP still exhibited excellent adsorption having an adsorption capacity of 19.35, 15.16, 6.425 mg/g when the concentration of NaCl was 0.6 mol/L. The free energy (E) was 12.33, 10.70, and 14.74 kJ/mol for Pb(II), Cu(II), and Zn(II), respectively. An adsorption mechanism based on ion exchange between heavy metal ions and H ? in the ATHP is proposed. Furthermore, the used ATHP was regenerated by HCl solution and the adsorbent was used repeatedly.

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Adsorption of heavy metal cations by Na-clinoptilolite: Equilibrium and selectivity studies

Cited by 113 publications

References 23 publications

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Removal of heavy metal ions from aqueous solution by zeolite synthesized from fly ash

Kinetic Adsorption Study of Silver Nanoparticles on Natural Zeolite: Experimental and Theoretical Models

Adsorption of aqueous Pb(II), Cu(II), Zn(II) ions by amorphous tin(VI) hydrogen phosphate: an excellent inorganic adsorbent

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