Adsorption of As(V) on surfactant-modified natural zeolites

Chutia, Pratap; Kato, Shigeru; Kojima, Toshinori; Satokawa, Shigeo

doi:10.1016/j.jhazmat.2008.05.024

Cited by 181 publications

(110 citation statements)

References 38 publications

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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

171

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

171

150

View full text Add to dashboard Cite

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“…Micrograph in Figure 2 presents the surface morphology enlarged for 5000x. Zeolite is known as a porous material, with the indication that it is mostly macroporous with a relatively small internal surface, according to data of other researchers [10,11].…”

Section: Resultsmentioning

confidence: 99%

The removal of the textile basic dye from the water solution by using natural zeolite

Amin¹,

Djordjević²,

Konstantinović³

et al. 2017

Adv Techol

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The use of natural zeolite for elimination of the textile basic dye from the water solution was researched in this paper. The practical simulation of purification of waste water from the textile industry was done. Zeolite was characterized by physical and chemical analysis. SiO 2 dominates the chemical structure of the adsorbent, followed by: Al 2 O 3 , CaO, Fe 2 O 3 , K 2 O. The used natural adsorbent -zeolite is a relatively fine bulk material with heterogenic porous particles, generally smaller than 45 µm. The effect of the initial dye concentration, pH and mixing time was investigated. In lower concentrations, the percentage of the removed dye is higher, but generally observed, a larger amount od dye is absorbed onto zeolite at higher initial concentrations. Longer adsorption time with a higher initial concentration results in a larger amount of the dye adsorbed by the adsorbent. The results confirm that all varied input parameters influence the efficiency of the basic dye adsorption and that the used natural zeolite, as adsorbent, has fulfilled the expectations considering the dye level after adsorption (the amount of the removed dye >82% at pH 4).

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“…After 2 h, zeolite particles were filtered using Whatman membrane filter (0.45 microns) and washed several times with distilled water so that the pH effluent reached to 7. In the final step, the zeolite powder was placed in an oven (at 100°Centigrade) for 12 h to remove moisture, and then, it was placed in the desiccators (Chutia et al 2009). …”

Section: Preparation Of Adsorbentmentioning

confidence: 99%

“…Zeolites have a number of characteristics such as dewatering, ion exchange capacity, low density and removal capability for organic and inorganic pollutants. These properties result in the use of zeolites for the removal of numerous contaminants from aqueous solutions such as cationic surfactants (Li 2007), basic dyes (Li et al 2015), chromate (Ghiaci et al 2004), Cr(VI) and As (V) (Yusof and Malek, 2009), cadmium (Vasylechko et al 2003) and arsenic (Chutia et al 2009;Malekpour et al 2009). Clinoptilolite is one of the most abundant zeolites and can be served in different applications such as aquaculture, agriculture, poultry, environments and medicine (Malekpour et al 2009) due to cost-effectiveness in view point of industrial usages.…”

Section: Introductionmentioning

confidence: 99%

Removal of dexamethasone from aqueous solutions using modified clinoptilolite zeolite (equilibrium and kinetic)

Mohseni

Amooey

Tashakkorian

et al. 2016

Int. J. Environ. Sci. Technol.

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The aim of this study was to remove a known pharmaceutics, dexamethasone, from an aqueous solution using clinoptilolite zeolite (CP). CP is a natural, versatile and inexpensive mineral, which has been investigated and applied in the last few decades. Herein, the experiments were carried out in the common conditions of a batch system in room temperature, and the effects of some parameters such as pH of the solution, initial concentration of dexamethasone, adsorbent dose and contact time were studied. Kinetic and isotherm of adsorption processes of dexamethasone on CP were surveyed in the current study. Results revealed that the maximum efficiency (78 %) occurred in pH = 4. The adsorption process followed a pseudo-second-order kinetic model as well as Freundlich and Sips isotherm models fitted with the experimental data well.

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Adsorption of As(V) on surfactant-modified natural zeolites

Cited by 181 publications

References 38 publications

Natural Zeolites in Water Treatment – How Effective is Their Use

Natural Zeolites in Water Treatment – How Effective is Their Use

The removal of the textile basic dye from the water solution by using natural zeolite

Removal of dexamethasone from aqueous solutions using modified clinoptilolite zeolite (equilibrium and kinetic)

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