A Comparative Study of the Sorption of Cd(II) and Pb(II) Ions from Aqueous Solution by Local Bentonite and Clinoptilolite

Faghihian, Hossein; Nejati-Yazdinejad, Massoud

doi:10.1260/026361709788921588

Cited by 23 publications

(3 citation statements)

References 30 publications

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“…This finding is in agreement with the order of binding constants for metallic ions with catechol derivatives [28]. This metallic uptake order was also observed by Moulay et al [20,21] and also when bentonite and clinoptilolite were employed as clay adsorbents [29].…”

Section: Metallic Adsorption-desorption Studysupporting

confidence: 90%

Synthesis of polyacrylamide-bound hydroquinone via a homolytic pathway: Application to the removal of heavy metals

Moulay¹,

Bensacia²,

Garin³

et al. 2014

Comptes Rendus. Chimie

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Polyacrylamide (PAAm) was chemically modified with hydroquinone (HQ) via a homolytic route. A degree of modification of approximately 58% was obtained under optimal reaction conditions: time of 6 h, and [modifier]/[acrylamide] molar ratio of 5. PAAm and its modified form HQ-PAAm were characterized by UV-visible spectroscopy, FT-IR spectroscopy, 13 C NMR spectroscopy, DSC, TGA, XRD, and SEM. A relatively lower molecular weight of the corresponding hydroquinone-functionalized form was measured. The glass transition temperature of the modified polymeric material was lower than that of the pristine one: 78.82 8C for HQ-PAAm versus 161.19 8C for PAAm. A study of Cu(II) adsorption by the cross-linked PAAm and HQ-PAAm resins was conducted by varying the following parameters: pH, time, temperature, ionic strength, sorbent mass, and initial Cu(II) concentration. The adsorption capacity of Pb(II) and Cd(II) by the different resins and their corresponding extents of desorption were estimated. The optimal conditions for metal ion uptake by polyacrylamide and its modified resin were: pH = 5.4, time = 120 min, temperature = 45 8C. The sorption extent by the modified resin was in the order Pb(II) > Cu(II) > Cd(II). The desorption of the experimented metallic ions from the resins exceeded 97%. A new way of cross-linking PAAm and its modified form is described herein.

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Section: Metallic Adsorption-desorption Studysupporting

confidence: 90%

Synthesis of polyacrylamide-bound hydroquinone via a homolytic pathway: Application to the removal of heavy metals

Moulay¹,

Bensacia²,

Garin³

et al. 2014

Comptes Rendus. Chimie

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“…One possible interpretation of this phenomenon is that Cd 2+ ions are well hydrated. To be adsorbed on soils, they have to lose the hydration shell which needs energy, so the removal of water molecules from Cd 2+ ions is an endothermic process in essence (Meng et al, 2008;Faghihian and Nejati-Yazdinejad, 2009). Several similar results were reported on Ni 2+ (Song et al, 2009) and Pb 2+ (Xu et al, 2008;Sheng et al, 2009) adsorption.…”

Section: Adsorption Characteristics Of Carbendazim and CDmentioning

confidence: 70%

Adsorption and desorption of carbendazim and cadmium in typical soils in northeastern China as affected by temperature

Zhou

Wei

et al. 2011

Geoderma

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“…Faghihian and Nejati-Yazdinejad [26] have studied the sorption of Cd(II) and Pb(II) ions by clinoptilolite under different experimental conditions in order to ascertain their potential as sorbents for the removal of these metal ions from aqueous solutions. The authors found that the removal of Pb(II) ions was much greater than that of Cd(II) ions under identical experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Powder XRD Study of Changes of Cd2+ Modified Clinoptilolite at Different Stages of the Ion Exchange Process

Dimowa

Tzvetanova

2021

Minerals

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Cadmium exchange on clinoptilolite is performed and structurally studied for different durations of the ion exchange process (2 h, 24 h, 72 h, 168 h, 12 days, 22 days) at room temperature and 90 °C. The distribution of Cd2+ ions in all samples is elucidated after exchange on clinoptilolite using powder XRD data processed by Rietveld structural software. Clinoptilolite is not selective for cadmium cations, but at 90 °C the exchange is ~2.5 cations per unit cell. At RT it reaches ~1.25 cations per unit cell being twice as low. The obtained maximum exchanged sample for 22 days 90 °C was structurally refined in order to find the cadmium positions in the clinoptilolite voids. The structural refinements of the occupations of the incoming and outgoing cations give an idea of how the intracrystalline diffusion is processed. A good correlation between results obtained by structural refinement of the Cd-exchanged samples and the data of the EDS measurements was achieved.

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A Comparative Study of the Sorption of Cd(II) and Pb(II) Ions from Aqueous Solution by Local Bentonite and Clinoptilolite

Cited by 23 publications

References 30 publications

Synthesis of polyacrylamide-bound hydroquinone via a homolytic pathway: Application to the removal of heavy metals

Synthesis of polyacrylamide-bound hydroquinone via a homolytic pathway: Application to the removal of heavy metals

Adsorption and desorption of carbendazim and cadmium in typical soils in northeastern China as affected by temperature

Powder XRD Study of Changes of Cd2+ Modified Clinoptilolite at Different Stages of the Ion Exchange Process

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