Zinc removal from aqueous solutions by adsorption onto bentonite

Bellir, K.; Lehocine, M. Bencheikh; Méniai, Abdeslam-Hassen

doi:10.1080/19443994.2013.808786

Cited by 30 publications

(12 citation statements)

References 35 publications

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“…Besides, surface complexation is also another possible mechanism for Cd 2+ and Zn 2+ ion removal onto Na-B adsorbent as it largely affects heavy metal ion removal onto clay adsorbents [21]. Beyond pH 8, precipitation, electrostatic attraction, and/or surface complexation are the predominant mechanisms for removal of the studied metal ions [37]. Zn ions are precipitated, complexed, or adsorbed easier than cadmium ions resulting in removal enhancement of zinc rather than cadmium as reported before [38].…”

Section: Effect Of Sorbent Dosagementioning

confidence: 99%

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Adsorption Behavior of Cd2+ and Zn2+ onto Natural Egyptian Bentonitic Clay

Burham

Sayed

2016

Minerals

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Abstract:In the present work, an Egyptian bentonitic clay sample has been structurally characterized using different techniques such as XRD, IR, SEM, and EDX analyses then evaluated as a sorbent for heavy metal ions removal. The characterization results showed that the clay sample is in the bentonite form with montmorillonite and kaolinite as mixed-clay minerals. The specific surface area (SSA) and cation exchange capacity (CEC) were determined using methylene blue test and they were found to be 367 m 2 /g and of 85 meq/100 g, respectively. The applicability of this clay sample for Cd (II) and Zn (II) removal from aqueous media was tested using batch procedures. Experimental parameters affecting the removal process were analyzed to get optimum conditions for the process. The experimental kinetic data were fitted very well to pseudo-second order with very high correlation coefficients. The Freundlich model appeared to correlate the adsorption data much better than Langmuir model with maximum adsorption capacities of 8.2 and 9.45 mg/g for Cd 2+ and Zn 2+ , respectively. Successful application of the studied adsorbent for the removal of Cd 2+ and Zn 2+ ions from natural water samples greatly supports its potential for practical application.

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Section: Effect Of Sorbent Dosagementioning

confidence: 99%

“…It shows the solute uptake rate that controls the diffusion and the residence time of adsorbate at the solid-solution interface [37]. To determine the metal ion uptake rate and explain the mechanism of adsorption, the experimental data were fitted using pseudo-first order and pseudo-second order kinetic models.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Adsorption Behavior of Cd2+ and Zn2+ onto Natural Egyptian Bentonitic Clay

Burham

Sayed

2016

Minerals

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“…Therefore, plant wastes need to be chemically treated or modified before being applied to the decontamination of heavy metals. Also, pretreatment of plant wastes can extract soluble organic compounds and enhance chelating efficiency [34].…”

Section: Chemically Modified Adsorbensmentioning

confidence: 99%

Porous Media for Removal of Organic and Inorganic Contaminants

Al-Mulla¹,

Jabbar²,

Al-Hamadani³

2018

Nano BioMed ENG

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“…Cadmium (Cd), lead (Pb), copper (Cu), and zinc (Zn) ions are among the most common heavy metal ions found in industrial effluents [1,2]. Zn 2+ is often found in effluents discharged from industries, such as galvanizing plants, acid mine drainage, natural ores, and municipal wastewater treatment plants [3,4]. Zn 2+ is not biodegradable and travels through the food chain via bioaccumulation.…”

Section: Introductionmentioning

confidence: 99%

Selective adsorption of Zn2+ on surface ion-imprinted polymer

Qiao

et al. 2016

Desalination and Water Treatment

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A B S T R A C TA new type of Zn 2+ ion-imprinted polymer (Zn 2+ -IIP) was synthesized on the surface of attapulgite, displaying high affinity and selectivity to Zn 2+ . Fourier transform infrared spectra (FTIR) revealed Zn 2+ -IIP to be an organic-inorganic hybrid polymer, with Zn 2+ imprinted cavities formed by CTS groups and connected to the surface of the attapulgite by A-187 cross-linked network. The adsorption kinetic investigation showed that the adsorption of Zn 2+ on Zn 2+ -IIP was a pseudo-second-order process. The maximum adsorption capacities of Zn 2+ were 0.536, 0.665, 0.715, and 0.722 meq/g at 288, 298, 308, and 318 K, respectively, where the activation energy, E a , was evaluated as 23.8 kJ/mol. By thermodynamic study, ΔH˚and ΔS˚of the adsorption were determined as 30.862 kJ/mol and 108.664 J/mol K, respectively, while the negative ΔG˚decreased with rising temperatures, indicating that the adsorption process was feasible and spontaneous. The adsorption selectivity of the Zn 2+ -IIP was also investigated via competitive adsorption of Zn 2+ , Cd 2+ , Cs + , Co 2+ , Ba 2+ , Sr 2+ , and Pb 2+ from a mixture, demonstrating that Zn 2+ -IIP had the capability of recognizing Zn 2+ with high affinity and selectivity. The study of multi adsorption-desorption cycles showed that the Zn 2+ -IIP can be reused many times without a significant decrease in the adsorption capacity.

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Zinc removal from aqueous solutions by adsorption onto bentonite

Cited by 30 publications

References 35 publications

Adsorption Behavior of Cd2+ and Zn2+ onto Natural Egyptian Bentonitic Clay

Adsorption Behavior of Cd2+ and Zn2+ onto Natural Egyptian Bentonitic Clay

Porous Media for Removal of Organic and Inorganic Contaminants

Selective adsorption of Zn2+ on surface ion-imprinted polymer

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