Adsorption capacity of iron- or iron–manganese-modified zeolite-rich tuffs for As(III) and As(V) water pollutants

Jiménez-Cedillo, M. J.; Olguín, M. T.; Fall, Cheikh; Colín, Arturo

doi:10.1016/j.clay.2011.09.004

Cited by 70 publications

(42 citation statements)

References 73 publications

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“…The presence of crystalline aluminum phases (e.g. hydrated aluminum oxide) was not identified in Z-Al samples as it was described by Jimenez-Cedillo about the formation of amorphous oxide species on a modified zeolite surface [14,15,30]. Al(III)) and water molecues which are coordinated in the zeolite framework [31].…”

Section: Materials Characterization Of Hydrated Aluminum Oxide Zeolitesmentioning

confidence: 77%

“…However, they have been rarely used for phosphate sorption due to the constant negative charge on their surface [12]. In order to improve the ion exchange capacity of natural zeolites for anionic species the incorporation or impregnation of iron and aluminum oxides, are the most widespread and excellent candidates for phosphate removal [13][14][15][16][17][18]. Zeolites exhibit different properties which depend on the geological location and they deserve a detailed characterization [19,20].…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Guaya

Valderrama

Farrán

et al. 2015

Chemical Engineering Journal

263

106

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A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminum oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (≅Al-OH) into the zeolite structure, as active groups for phosphate removal, was characterized by acid-base titrations (pHPZC=4.5±0.2). The phosphate sorption increases from 0.6 mg-P/g for Z-N up to 7.0 mg-P/g while only a slight decrease on the ammonium sorption capacity from 33 mg-N/g of Z-N to 30 mg-N/g for Z-Al was observed. The HAlO modified zeolite sorption capacity for both phosphate and ammonium was slightly reduced by common ions typically present in secondary waste water effluents. Column experiments revealed higher enrichment factor for ammonium (120) than for phosphate (50) using 1 M NaOH as elution solution. A reduction of zeolite phosphate capacity with regeneration cycles was observed.

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Section: Materials Characterization Of Hydrated Aluminum Oxide Zeolitesmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Guaya

Valderrama

Farrán

et al. 2015

Chemical Engineering Journal

263

106

View full text Add to dashboard Cite

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“…Additionally, a model which proposes the adhesion mechanism of the nanoparticles on the zeolite surface is presented. [14,23].…”

Section: Methodsmentioning

confidence: 99%

“…These minerals offer low-cost, effective supports for nano-scale entities. The reactivity of nano-scale zero-valent metals such as Ag and the high cation-exchange capacity of the zeolites represent a potential alternative for remediation applications [7,13,14,19]. However, specific studies about kinetics adsorption of nanoparticles on clinoptilolite have not been explored thoroughly.…”

Section: Introductionmentioning

confidence: 99%

“…The most commonly used kinetic expressions to explain the solid/liquid adsorption processes are the pseudo-first-order kinetic and pseudo-second-order kinetic models [7][8][9][10]. A good number of works were reported where the modifications of these natural clays with nanoparticles were produced to carry out the adsorption of metals from aqueous solutions [8,[11][12][13][14][15][16][17][18]. These minerals offer low-cost, effective supports for nano-scale entities.…”

Section: Introductionmentioning

confidence: 99%

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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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Sustainable Metal Extraction From Waste Streams

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Adsorption capacity of iron- or iron–manganese-modified zeolite-rich tuffs for As(III) and As(V) water pollutants

Cited by 70 publications

References 73 publications

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite

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

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