Removal of 137Cs from aqueous solutions using different cationic forms of a natural zeolite: clinoptilolite

Abusafa, Abdelrahim; Yücel, Hayrettin

doi:10.1016/s1383-5866(02)00042-4

Cited by 147 publications

(85 citation statements)

References 28 publications

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“…The linearity of the Langmuir plot and isotherm parameters indicate the occurrence of chemisorption processes. However, the D-R mean adsorption energy (E) value whose magnitude is used in estimating the type of adsorption indicates physisorption (Mufazzal et al, 1999;Abusafa & Yucel, 2002;Mahramanlioglu et al, 2002;Erdem et al, 2004). From the D-R isotherm, the apparent energy, E, of adsorption was 6.6815 kJ/mol.…”

Section: Resultsmentioning

confidence: 99%

Equilibrium Studies of Methylene Blue Dye Sorption by Dried Water Hyacinth Shoot

Inengite¹,

Abasi²,

Johnny³

2014

ENRR

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Water hyacinth (Eichhornia crassipies) has proved to be a menace in water bodies and studies are on, in the direction of solving this problem; one of which is to discover economic uses of water hyacinth. Adsorption of heavy metals and dyes from aqueous solutions by activated carbon derived from water hyacinth is one of such studies. In this study, dried and pulverized water hyacinth shoot was used for the sorption studies. This is in the bid of eliminating the rigours of producing activated carbon, thereby saving time and cost. The adsorption capacity of water hyacinth shoot for Methylene Blue dye was studied as a function of initial metal ion concentration in a batch system. Results showed that adsorption increased with methylene blue dye concentration. Seven adsorption isotherms, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Florry-Huggins, Harkins-Jura and Henry's isotherms were applied to the adsorption data. Isotherm parameters showed that all the isotherms correlated well with the adsorption data. The maximum adsorption capacity of Methylene Blue dye to the dried water hyacinth shoot was found to be 58.14mg/g. The use of dried water hyacinth shoot would appreciably save the time and cost for producing activated carbon but not without some compromise of efficiency.

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Section: Resultsmentioning

confidence: 99%

Equilibrium Studies of Methylene Blue Dye Sorption by Dried Water Hyacinth Shoot

Inengite¹,

Abasi²,

Johnny³

2014

ENRR

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“…In order to distinguish between physical and chemical sorption on the heterogeneous surfaces, the Dubinin -Radushkevich (D-R) model [20] was tested in the form given in Eq. (6): ln C sorb = lnX m -be 2 (6) where Csorb is the amount of Ni(II) ions sorbed on per unit mass of sorbent (mol g -1 ), Xm is the maximum sorption capacity with the same units, b is the activity coefficient related to free energy, E, and e is the Polanyi potential, which is expressed as Eq. (7) [21]:…”

Section: Sorption Isothermsmentioning

confidence: 99%

“…Various substances, such as ion-exchange resins [5], zeolites [6,7], clay minerals [8,9], river sand [10 -13], and sea beach sand [14,15], have been investigated as adsorbents. Apart from natural materials, different industrial waste materials have been used as adsorbents for the removal of heavy metal ions from water and wastewater, e. g., pottery material, which is a waste of the ceramic industry [16].…”

Section: Introductionmentioning

confidence: 99%

Sorptive Potential of Beach Sand to Remove Ni(II) Ions: An Equilibrium Isotherm Study

Taqvi¹,

Hasany

Bhanger

2008

CLEAN Soil Air Water

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The potential to remove Ni(II) ions from aqueous solutions using sea beach sand, a carbonate-quartz mineral, was thoroughly investigated. The effects of relevant parameters such as solution pH, adsorbent dose, metal ions concentration, and temperature on Ni(II) sorption onto beach sand were examined. The sorption data followed the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherms. The adsorption was endothermic in nature at ambient temperature and the computation of the parameters, DH, DS and DG indicated the interactions between sorbate and sorbent to be thermodynamically favorable. Equilibrium was achieved very quickly within 30 min of shaking. A pseudo-first order Lagergren equation was used to test the adsorption kinetics. Other kinetic models, e. g., the Morris-Weber and Reichenberg equations, were used to calculate the rate constant of intraparticle diffusion and the fate of the diffusion process, respectively. The influence of some of the common cations and anions were also a subject of this study.

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“…These processes are used for reduction of the discharge of radioactivity to the environment and to decrease solid waste from existing effluent treatment facilities (IAEA, 2004). Most research on zeolites in the nuclear waste field, based on the literature, has focused on the removal of cationic species such as cesium and strontium from nuclear wastewaters (Abusafa andYucel, 2002, Dyer andAggarwal, 1995).…”

Section: Introductionmentioning

confidence: 99%

Desalination of aqueous solutions by LTA and MFI zeolite membranes using pervaporation method

Malekpour

Samadi‐Maybodi

Sadati

2011

Braz. J. Chem. Eng.

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-LTA and MFI zeolite membranes were hydrothermally grown on the surface of an α-alumina porous support. The synthesized membranes were used for removal of cationic and anionic species from aqueous solutions by the pervaporation method. The perfection of the membranes was improved by employing the multi-stage synthesis method. The membranes were characterized by XRD, SEM and IR methods. The membranes were initially evaluated by the pervaporation separation of water from aqueous 2-propanol mixtures. The separation factors obtained were 7081 and 105 for NaA and ZSM-5 membranes, respectively. The ability of membranes for desalination of some aqueous solutions containing I -, Cs + and Sr 2+ ions was examined in various conditions. These ionic species were chosen because of their importance in the nuclear sciences. Both membranes effectively removed (more than 99 wt%) I -, Cs + and Sr 2+ from their singlesalt solutions (0.001mol dm -3 ) over a temperature range of 298-338 K. The effects of parameters such as time and temperature on the separation factors and fluxes were investigated. This work shows that, due to their excellent chemical, thermal and mechanical stability, the zeolitic membranes are useful for desalination of aqueous solutions and treating saline wastewaters by pervaporation. Therefore, this method has the ability to desalinate harsh environment solutions involving strong solvent and radioactive components.

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Removal of 137Cs from aqueous solutions using different cationic forms of a natural zeolite: clinoptilolite

Cited by 147 publications

References 28 publications

Equilibrium Studies of Methylene Blue Dye Sorption by Dried Water Hyacinth Shoot

Equilibrium Studies of Methylene Blue Dye Sorption by Dried Water Hyacinth Shoot

Sorptive Potential of Beach Sand to Remove Ni(II) Ions: An Equilibrium Isotherm Study

Desalination of aqueous solutions by LTA and MFI zeolite membranes using pervaporation method

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