In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

Dávila-Jiménez, Martín M.; Elizalde-González, Marı́a P.; Mattusch, Jürgen; Morgenstern, Peter; Pérez-Cruz, María Ana; Reyes‐Ortega, Yasmi; Wennrich, Rainer; Yee‐Madeira, H.

doi:10.1016/j.jcis.2008.03.042

Cited by 41 publications

(17 citation statements)

References 49 publications

(67 reference statements)

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“…A comparative analysis between raw and treated clinoptilolite shows the SiO 2 /Al 2 O 3 ratio has increased from 4.62 to 12.39. Such an observation has been reported in other papers which contained acid treatment(Cobzaru et al, 2008;Da´vila-Jime´nez et al, 2008). In addition, decreasing SiO 2 /Al 2 O 3 mass ratio leads to smaller loss of ignition (L.O.I.…”

supporting

confidence: 79%

The potential use of HNO 3 -treated clinoptilolite in the preparation of Pt/CeO 2 -Clinoptilolite nanostructured catalyst used in toluene abatement from waste gas stream at low temperature

Amereh

Haghighi

Estifaee

2018

Arabian Journal of Chemistry

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In this paper, CeO 2 (30%)/Clinoptilolite was synthesized via HNO 3 treatment and coprecipitation methods and then 1% Pt was dispersed over support by ultrasound assisted wet impregnation. The synthesized samples were characterized using XRF, XRD, FESEM, N 2 adsorption and FTIR techniques. The obtained results from XRD revealed the main phase in utilized clay is clinoptilolite and also formation of amorphous structure was proved after acid treatment. FESEM micrographs confirmed significant structural changes in clinoptilolite after acid treatment and also formation of ceria nanoparticles. N 2 adsorption presented large enough surface area for Pt/CeO 2 -Clinoptilolite nanostructured catalyst to be used for toluene oxidation. Finally, activity results indicated that synthesized nanostructured catalyst was highly active and stable and could eliminate more than 90% of toluene at 130°C. Utilizing inexpensive materials in synthesis and assisting ultrasound in dispersion of active phase have made Pt(1%)/CeO 2 (30%)-Clinoptilolite a nominee to be used for catalytic oxidation of toluene. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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supporting

confidence: 79%

The potential use of HNO 3 -treated clinoptilolite in the preparation of Pt/CeO 2 -Clinoptilolite nanostructured catalyst used in toluene abatement from waste gas stream at low temperature

Amereh

Haghighi

Estifaee

2018

Arabian Journal of Chemistry

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“…Chemical modification with inorganic salts (NaCl, CaCl2, BaCl2, NH4Cl, FeCl3) or a cationic surfactant (hexsadecyltri-methylammonium (HDTMA) -bromide) give to improve zeolite properties and increase its efficiency in water treatment [19,[31][32][33][34][35][36][37][38]. For successful modification high-concentration solutions of inorganic salts on the surface of zeolite is significant as shown in Figure 6.…”

Section: Modification With Solution Of Inorganic Saltsmentioning

confidence: 99%

Natural Zeolites in Water Treatment – How Effective is Their Use

Margeta¹,

Logar²,

Šiljeg³

et al. 2013

Water Treatment

166

150

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/50738 IntroductionNatural zeolites are environmentally and economically acceptable hydrated aluminosilicate materials with exceptional ion-exchange and sorption properties. Their effectiveness in different technological processes depends on their physical-chemical properties that are tightly connected to their geological deposits. The unique treedimensional porous structure gives natural zeolites various application possibilities. Because of the excess of the negative charge on the surface of zeolite, which results from isomorphic replacement of silicon by aluminum in the primary structural units, natural zeolites belong to the group of cationic exchangers. Numerous studies so far have confirmed their excellent performance on the removal of metal cations from wastewaters. However, zeolites can be chemically modified by inorganic salts or organic surfactants, which are adsorbed on the surface and lead to the generation of positively charged oxihydroxides or surfactant micelles, and which enables the zeolite to bind also anions, like arsenates or chromates, in stable or less stable complexes. Natural zeolites have advantages over other cation exchange materials such as commonly used organic resins, because they are cheap, they exhibit excellent selectivity for different cations at low temperatures, which is accompanied with a release of non-toxic exchangeable cations (K + , Na + , Ca 2+ and Mg 2+ ) to the environment, they are compact in size and they allow simple and cheap maintenance in the full-scale applications. The efficiency of water treatment by using natural and modified zeolites depends on the type and quantity of the used zeolite, the size distribution of zeolite particles, the initial concentration of contaminants (cation/anion), pH value of solution, ionic strength of solution, temperature, pressure, contact time of system zeolite/solution and the presence of other organic compounds and anions. For water treatment with natural zeolites, standard procedures are used, usually a procedure in column or batch process. Ion exchange and adsorption properties of natural zeolites in comparison with other chemical and biological processes have the advantage of Water Treatment 82removing impurities also at relatively low concentrations and allows conservation of water chemistry, if the treatment is carried out in the column process [1]. Subject of further academic and industrial research should be to improve the chemical and physical stability of modified zeolites and to explore their catalytic properties, which would allow their use in catalytic degradation of organic pollutants. More careful consideration of their superb metal removal properties and awareness of possible regeneration or further use of contaminant/metal-loaded forms can considerably increase their environmental application possibilities, with a focus the reduction of high concentrations of cations and anions in drinking water and wastewater, for surface, und...

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“…However, arsenic is found as anionic species like trivalent arsenite (AsO 2 ) − or less toxic pentavalent arsenate (HAsO 4 ) 2− which cannot be exchangeable by the cations from zeolite. The possibility of chemical modification of zeolite surface with metallic oxides or surfactants allows zeolites to be effective adsorbents for anionic species [5][6][7][8][9][10]. Several papers have focused on the strong adsorption affinity of arsenic to Fe or Al oxides/hydroxides forming very stable As-Fe/Al complexes.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium arsenic adsorption onto metallic oxides : Isotherm models, error analysis and removal mechanism

Şimşek

Beker²

2014

Korean J. Chem. Eng.

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Arsenic adsorption properties of mono-(Fe or Al) and binary (Fe-Al) metal oxides supported on natural zeolite were investigated at three levels of temperature (298, 318 and 338 K). All data obtained from equilibrium experiments were analyzed by Freundlich, Langmuir, Dubinin-Radushkevich, Sips, Toth and Redlich-Peterson isotherms, and error functions were used to predict the best fitting model. The error analysis demonstrated that the As(V) adsorption processes were best described by the Dubinin-Raduskevich model with the lowest sum of normalized error values. According to results, the presence of iron and aluminum oxides in the zeolite network improved the As(V) adsorption capacity of the raw zeolite (ZNa). The X-ray photoelectron spectroscopy (XPS) analyses of ZNa-Fe and ZNa-AlFe samples suggested that the redox reactions are the postulated mechanisms for the adsorption onto them while the adsorption process is followed by surface complexation reactions for ZNa-Al.

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In situ and ex situ study of the enhanced modification with iron of clinoptilolite-rich zeolitic tuff for arsenic sorption from aqueous solutions

Cited by 41 publications

References 49 publications

The potential use of HNO 3 -treated clinoptilolite in the preparation of Pt/CeO 2 -Clinoptilolite nanostructured catalyst used in toluene abatement from waste gas stream at low temperature

The potential use of HNO 3 -treated clinoptilolite in the preparation of Pt/CeO 2 -Clinoptilolite nanostructured catalyst used in toluene abatement from waste gas stream at low temperature

Natural Zeolites in Water Treatment – How Effective is Their Use

Equilibrium arsenic adsorption onto metallic oxides : Isotherm models, error analysis and removal mechanism

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