Adsorption characteristics of As(V) on iron-coated zeolite

Jeon, Choong; Baek, Kitae; Park, Joon Kyu; Oh, Young-Ki; Lee, Sang‐Do

doi:10.1016/j.jhazmat.2008.07.052

Cited by 166 publications

(90 citation statements)

References 20 publications

(21 reference statements)

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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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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

View full text Add to dashboard Cite

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“…MNCZ was prepared according to the methodology described by Jeon et al [22] with some modification; briefly, 5 g of zeolite with a 6.1 g FeCl 3 Á 6H 2 O and 4.2 g FeSO 4 Á 7H 2 O were mixed and dissolved in 100 mL using ultrasonication. Thereafter, the pH of the mixture was adjusted to 10.0 using 0.1 M NaOH, and the mixture was agitated in a rotary shaker at room temperature for 24 h. A total of 25 mL 6.5 M NaOH was then slowly added and mixed with the above solution.…”

Section: Synthesis and Characterisation Of (Mncz)mentioning

confidence: 99%

“…Therefore, Fe(II) and Fe(III) were loaded on zeolite mineral following the description of Jeon et al [22] with some modification. Fe(II) and Fe(III) solutions were agitated with a known amount of zeolite mineral for 24 h at room temperature.…”

Section: Regeneration and Reuse Of Mnczmentioning

confidence: 99%

Synthesised magnetic nanoparticles coated zeolite (MNCZ) for the removal of arsenic (As) from aqueous solution

Salem

Yin

2012

Journal of Experimental Nanoscience

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A novel adsorbent, magnetic nanoparticle (-Fe 2 O 3 )-coated zeolite (MNCZ), was prepared for the removal of arsenic (As) ions from aqueous solution. The influence of different sorption parameters, that is, contact time, acidic reaction (pH) and initial arsenic concentration were studied using batch equilibrium techniques. The results obtained showed that the MNCZ was effective for the removal of As from aqueous solution, and the percentage removal of As could reach over 95.6% at a pH value of 2.5 within 15 min. Moreover, the removal of As depended on the initial concentration of As. For the regeneration of MNCZ material, 0.1 M NaOH was suitable for the desorption of As (70% after 15 min), and the regenerated material showed an adsorption capacity of 93.95% within five cycles. We concluded that MNCZ presents a reusable adsorbent for a fast, convenient and highly efficient removal of As from aqueous solution.

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“…Besides, the use of synthetic adsorbents is considered inapt for developing countries because of its high manufacturing cost. Recently, attempts have been made to increase the sorption capacity of natural adsorbents towards heavy metals by chemical modification of their surface (Knoerr et al 2013;Ş an et al 2009;Zhu et al 2012;Liu et al 2013;Han et al 2006Han et al , 2009Jeon et al 2009;Zou et al 2009;Choi et al 2012). The common and highest concentration for heavy metal adsorption in aqueous solution in most recent investigations has been between 200 and 300 mg/l.…”

Section: Introductionmentioning

confidence: 99%

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

2017

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Photocatalytically modified ceramic adsorbents were synthesized for the removal of high concentration Cu (II) and Co (II) ions from their aqueous solutions. The raw material, diatomaceous aluminosilicate mineral was modified using silver and anatase titanium oxide nanoparticles. Batch adsorption experiment was carried out on the targeted metal ions and the results were analyzed by the Langmuir and Freundlich equation at different concentrations (100-1000 mg/l) and the characteristic parameters for each adsorption isotherm were determined. As-received raw materials do not exhibit any sorption capacity for high concentration Cu 2? and Co 2? adsorbates. However, the adsorption isotherms for modified diatomaceous ceramic adsorbents could be fitted well by the Langmuir model for both Cu 2? and Co 2? with correlation coefficient (R) of up to 0.99953. The highest and lowest monolayer coverage (q max ) were 121.803 and 31.289 mg/g for Cu 2? and Co 2? , respectively. The separation factor (R L ) in the experiment was less than one (\1), indicating that the adsorption of metal ions on the Ag-TiO 2 -modified ceramic adsorbent is favorable. The highest adsorption capacity (K f ) and intensity (n) constants obtained from Freundlich model are 38.832 (Cu 2? on ZEO-T) and 5.801 (Co 2? on STOX-Z).

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Adsorption characteristics of As(V) on iron-coated zeolite

Cited by 166 publications

References 20 publications

Natural Zeolites in Water Treatment – How Effective is Their Use

Natural Zeolites in Water Treatment – How Effective is Their Use

Synthesised magnetic nanoparticles coated zeolite (MNCZ) for the removal of arsenic (As) from aqueous solution

Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

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