zeolite Articles
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Natural Zeolite Pozzolan Comparison
A recent study published this comparison of clinoptilolite zeolite against silica fume, fly ash, and a non-zeolitic natural pozzolan. The results are very interesting. Clinoptilolite is the most common of natural zeolites. In this study researchers compared this mineral as a natural pozzolan, versus other pozzolanic options, in lime pastes. The results showed that the clinoptilolite possesses a ...
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Removal of calcium and magnesium ions from shale gas flowback water by chemically activated zeolite
Shale gas has become a new sweet spot of global oil and gas exploration, and the large amount of flowback water produced during shale gas extraction is attracting increased attention. Internal recycling of flowback water for future hydraulic fracturing is currently the most effective, and it is necessary to decrease the content of divalent cations for eliminating scaling and maintaining ...
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Cu(II) removal from aqueous solution using Dogantepe (Amasya) zeolites
This paper investigates the effects of zeolite particle size, zeolite/ solution ratio and stirring time on the performance of zeolites from Dogantepe in removing Cu(II) from aqueous solution to establish optimum operating conditions. The results indicated that the size of the zeolite samples, the concentration of Cu(II) and the zeolite/solution ratio affected the removal efficiencies, whilst the ...
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Synthesis of Na-Pc zeolite from perlite and study of its ability to remove cyanide from liquid wastes
With the aim of the economic upgrading of natural resources, this investigation examined the hydrothermal synthesis of zeolite from perlite, and the ability of the synthetic zeolite to adsorb and retain cyanide. The hydrothermal treatment of perlite with aqueous sodium hydroxide results in the formation of Na-Pc zeolite. The cation-exchange capacity of zeolite for zinc, copper and silver was ...
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Ammonium removal from groundwater using a zeolite permeable reactive barrier: a pilot-scale demonstration
In situ remediation of ammonium-contaminated groundwater is possible through a zeolite permeable reactive barrier (PRB); however, zeolite's finite sorption capacity limits the long-term field application of PRBs. In this paper, a pilot-scale PRB was designed to achieve sustainable use of zeolite in removing ammonium (NH4+-N) through sequential nitrification, adsorption, and ...
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Ammonium removal from aqueous solution by zeolite X synthesized from halloysite mineral
Zeolite X was successfully synthesized from natural halloysite mineral by hydrothermal method. The synthesized zeolite X was characterized by XRD, SEM, TEM and HRTEM. The characterization indicated that zeolite X had high crystallinity together with symmetrical and uniform pore channels. Ammonium (NH4+) adsorption properties of zeolite X were studied using batch experiments. The results revealed ...
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Removal of trivalent metal ions from aqueous solution via cross-flow ultrafiltration system using zeolite membranes
This study aimed to assess the performance of three zeolite membranes in the removal of trivalent metal ions from aqueous solution using a cross-flow mode of operation. Three types of zeolite membrane, MCM-41, MCM-48 and FAU, were prepared on a low-cost, circular ceramic support by hydrothermal treatment. The three zeolite membranes were characterized by using X-ray diffraction (XRD), field ...
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Ammonium removal from aqueous solutions by zeolite adsorption together with chemical precipitation
The aim of this study was to remove ammonium from aqueous solution and recycle ammonium. Ammonium removal from aqueous solution by natural and pretreated zeolites, breakthrough curve, chemical regeneration of pretreated zeolite, ammonium removal from regeneration solution by chemical precipitation and NH4+ adsorption isotherms were investigated by conducting a series of batch and continuous ...
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Lead, copper, cobalt and nickel removal from water solutions by dynamic ionic exchange in LECA zeolite beds
LECA zeolite, a novel material containing zeolite crystallised on light expanded clay aggregates (LECA) substrates with the aid of a hydrothermal process, was used in ionic exchange applications. LECA zeolite combines the porosity, low density and good mechanical properties of LECA substrates with the microporosity and ion-exchange properties of zeolites. In the present work, the dynamic ionic ...
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Preparation and photoelectrocatalytic performance of N-doped TiO2/NaY zeolite membrane composite electrode material
A novel composite electrode material based on a N-doped TiO2-loaded NaY zeolite membrane (N-doped TiO2/NaY zeolite membrane) for photoelectrocatalysis was presented. X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible (UV-vis) and X-ray photoelectron spectroscopy (XPS) characterization techniques were used to analyze the structure of the N-doped TiO2/NaY zeolite membrane. ...
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Zeolite Molecular Sieve NaY Dessicant
Y Zeolite is a kind of micropores crystal material with framework structure, and the basic structure element is Si-O and Al-O tetrahedron which can form the secondary structure element like 4 membered ring, 6 membered ring and 8 membered ring by Si-O or Al-O bond. By connected with each other, the secondary structure element can form β cage.8 β cages arrange as diamond crystal pattern, ...
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Powerful Landfill-Safe Absorbent
Saturated zeolites that are loaded with toxic heavy metals should be considered as eco-friendly compounds that can be landfilled. The loaded zeolite has high leaching resistance preventing easy release of the adsorbed heavy metals. In particular situations (e.g. when loaded with ammonia and phosphorus) the spent zeolite can be used as a soil amender material and slow release fertilizer. This, ...
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Investigation of the solution initial pH effects on the performance of UV/Fe-ZSM5/H2O2 process
Effect of the solution initial pH was investigated on the performance of photo-Fenton process using Fe-ZSM5 zeolite as a heterogeneous catalyst for degradation of azo dye Acid Red 14. All experiments were performed in a 1.0 L tubular closed circulation batch photo-reactor. The dye degradation quantum yield was maximal when the solution initial pH was about 5. An amount of about 0.3 mg L−1 of Fe ...
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Using numerical simulation of a one stage vertical flow wetland to optimize the depth of a zeolite layer
This simulation study investigates the treatment performance of a compact French vertical flow wetland using a zeolite layer in order to increase ammonium nitrogen removal. For the modelling exercise, the biokinetic model CW2D of the HYDRUS Wetland Module is used. The calibrated model is able to predict the effect of different depths of the zeolite layer on ammonium nitrogen removal in order ...
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Reducing Climate Change with Natural Zeolite in Concrete
Calculating the total environmental impact of concrete with and without natural zeolite as a Portland cement replacement. A joint research team from the University of Mazandaran (Iran) and the Massachusetts Institute of Technology (USA) developed a method of quantifying the environmental impact of different concrete mixtures. The team used this method to analyze the life cycle assessment of ...
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What is Zeolite Water Treatment Media?
How is zeolite water treatment media used in water & wastewater treatment? Technology is constantly evolving and changing to meet the needs of humanity, and one of those needs is for clean water. The water treatment industry is always researching, testing, and developing new and improved ways in which to treat wastewater and drinking water in ways that are both efficient and environmentally ...
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Adsorptive removal of trace oxytetracycline from water by acid-modified zeolite: influencing factors
Because of the wide use of antibiotics in the livestock industry, trace tetracycline antibiotics are frequently detected in swine wastewater and water bodies near pig farms. Based on natural zeolite, modified zeolite was synthesized by treatment with nitric acid. As one kind of typical tetracyclines, oxytetracycline (OTC) was chosen as the target adsorbate. Removal of trace OTC by modified ...
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Investigation of Cu(II) adsorption from aqueous solutions by NKF-6 zeolite
Adsorption of Cu(II) from aqueous solutions using NKF-6 zeolite was investigated by batch technique under ambient conditions. The adsorption was investigated as a function of pH, ionic strength, fulvic acid (FA), foreign ions and temperature. The results indicated that the adsorption of Cu(II) on NKF-6 zeolite gradually increases from 0 to 90% with increasing pH at pH6.5. Outer-sphere ...
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Impact of steel slag on the ammonium adsorption by zeolite and a new configuration of zeolite-steel slag substrate for constructed wetlands
The CaO dissolution from slag, as well as the effects of influencing parameters (i.e. pH and Ca2+ concentration) on the ammonium adsorption onto zeolite, was systematically studied in this paper. Modeling results of Ca2+ and OH− release from slag indicated that pseudo-second-order reaction had a better fitness than pseudo-first-order reaction. Changing pH value from 7 to 12 resulted in a ...
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Industrial Application of Zeolite in Water Treatment
Natural zeolite use as Filter material Filter material is the general name of water treatment filter material, mainly used for domestic sewage, industrial sewage, pure water, drinking water filtration. from: Zeolitemin.com Natural zeolite is a kind of Aluminosilicate mineral with white or brick red appearance. It belongs to weak acid cation exchanger. After artificial introduction of active ...
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