natural zeolites iranian

  • Natural Zeolite as a Cost-effective Opacifier

    Zeolites are high porous and crystalline alumino-silicates with a three-dimensional structure based upon repeated units of silica (SiO 4) and alumina (AlO 4) tetrahedral . Based on high-temperature phase transformations of natural zeolites , possibility of using Iranian natural zeolite as opacifier of tiles are investigated in this study ...[...]

  • Removal of Ammonia from Air, using Three Iranian Natural ...

    Recently the removal of environmental pollutants such as ammonia by means of natural and modified zeolites has attracted a lot of attention and interests. In this study the capability of three Iranian natural zeolites (Clinoptilolite) in point of view of removal of ammonia from air was investigated.[...]

  • Removal of Ammonia from Air, using Three Iranian Natural

    CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Ammonia in air can be hazardous to human and animal life and should be removed from the environment. Recently the removal of environmental pollutants such as ammonia by means of natural and modified zeolites has attracted a lot of attention and interests. In this study the capability of three Iranian natural zeolites ...[...]

  • Soil cadmium stabilization using an Iranian natural ...

    Jan 15, 2007· For sandy and loamy soils, application of zeolite effectively reduces soil hydraulic conductivity. In the case of clay soils, on the contrary, zeolite would slightly increase its hydraulic conductivity. The findings of the present study can be used in determining possible applications of Iranian natural zeolites for cadmium stabilization in soils.[...]

  • Ion Exchange Behavior of Zeolites A and P Synthesized ...

    Natural zeolites from two different regions of Iran (i.e. Semnan and Ardakan) were collected, ground and sieved. Both zeolites were clinoptilolite type. Some portions with the particle size of 224-500 µm were tested for ion exchange experiments. According to our primary experiments natural zeolites …[...]

  • Recent advances in the science and technology of natural ...

    Iran has significant deposits of high-purity natural zeolites. Many Iranian scholars conduct scientific research on porous materials, from natural and synthetic zeolites to metal[...]

  • Effects of Ammonium and Iranian Natural Zeolite on ...

    How to cite this article: M. Rezaei and S.A.R. Movahedi Naeini, 2009. Effects of Ammonium and Iranian Natural Zeolite on Potassium Adsorption and Desorption Kinetics in the Loess Soil.[...]

  • Sorption characteristics of heavy metal ions by a natural ...

    Zeolites have been shown to be effective adsorbents for the removal of heavy metals from aqueous solutions. A natural material from Cuba, containing zeolite, has been used for the removal of several metal ions, namely Cu 2+, Zn 2+, and Ni 2+, to evaluate its potential use as a low‐cost adsorbent. Batch experiments have been conducted to ...[...]

  • An experimental study on durability properties of concrete ...

    An experimental study on durability properties of concrete containing zeolite as a highly reactive natural pozzolan Meysam Najimia,b, Jafar Sobhanib, Babak Ahmadic,d,⇑, Mohammad Shekarchid a Department of Civil and Environmental Engineering, University of Nevada-Las Vegas, USA bConcrete Technology Department, Building and Housing Research Center, Tehran 13145-1696, Iran[...]

  • Ion exchangers in radioactive waste management: natural ...

    The natural zeolites chosen for these studies show a similar pattern to those synthetic ion exchangers in the literature and in some cases an extremely high selectivity towards certain radioactive elements. Hence the binary separation of radioactive elements could easily be carried out.[...]

  • Characterization of Some Iranian Natural Zeolites

    and comprehensive research on the characterization of natural zeolites causes these valuable minerals to be relatively unknown. The aim of this research is to characterize some of the Iranian natural zeolites by means of thermal analysis methods including thermogravimetry (TG), …[...]

  • Soil cadmium stabilization using an Iranian natural ...

    Jan 15, 2007· Read "Soil cadmium stabilization using an Iranian natural zeolite, Geoderma" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.[...]

  • Adsorption of fluoride from water by Al3+ and Fe3 ...

    Besides human dental and skeletal fluorosis, drinking water above permissible levels of fluoride is known to cause a wide range of adverse health effects. In this study, the adsorption of Fluoride from aqueous solution onto pretreated zeolite has been studied by using batch test. The large surface area of natural zeolite (i. e., clinoptilolite from Miyaneh region, Iran) was utilized to create ...[...]

  • Iranica Journal of Energy & Environment Adsorption of CO ...

    The natural kaolin (a source of silica and alumina) from Iranian sources was used for the present study. This kaolin had high amount of SiO 2 and low amount of Al 2 O 3, so we modified it by acidizing to obtain convenient kaolin for synthesis of 13X zeolite. Table 1 shows the properties of raw kaolin and modified kaolin. Metakaolin[...]

  • USING OF NATURAL ZEOLITES AS A HEAVY METALS …

    USING OF NATURAL ZEOLITES AS A HEAVY METALS ABSORBER FOR WASTEWATER REUSE IN IRRIGATION Sayyed Hassan Tabatabaei *and Abdolmajid Liaghat** * Assistant Professor, Department of Water Engineering, Agricultural Faculty, Shahrekord University, Shahrekord, Iran E-mail: [email protected][...]

  • Ion-exchange process for ammonium removal and ... - DeepDyve

    Feb 01, 2011· Read "Ion-exchange process for ammonium removal and release using natural Iranian zeolite, Applied Clay Science" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.[...]

  • Recent advances in natural zeolites sciences and ...

    Iran has significant deposits of high-purity natural zeolites. Many Iranian scholars conduct scientific research on porous materials, from natural and synthetic zeolites to metal organic framework ...[...]

  • Adsorption of fluoride from water by Al and Fe pretreated ...

    Adsorption of fluoride from water by Al 3+ and Fe pretreated natural Iranian zeolites 1Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran 2Department of Environmental Management, Graduate School of …[...]

  • (PDF) Ion-exchange process for ammonium removal and ...

    Fig. 5 also shows that the RL Natural Iranian zeolite 11.31(62.66) This study value approaches zero as the C0 value is increased, which indicates (millimeter) that the exchange of NH+ 4 ion onto natural zeolites is less favorable at Natural Iranian zeolite 13.27 (73.52) This study (nanometer) high concentrations of NH+ 4 (Saltali et al., 2007).[...]

  • Preparation and Characterization of Natural Zeolite ...

    The natural zeolites, specifically, the clinoptilolite, have been widely studied due to the great cationic exchange capacity presented and their potential applications in the removal of pathogenic microorganisms [1–5]. The zeolites are highly porous with cavities in their structure with pore sizes and characteristic chemical composition .[...]

  • Afrazand Natural zeolite manufacturer

    Iranian Afrazand Natural Zeolite. Natural Zeolites are hydrated aluminosilicates in combination with alkali and alkaline earth metals. The specific network of pores in the Zeolite structure provides some special characteristics to be used as adsorbent, absorbent, cation …[...]

  • Natural zeolites as effective adsorbents in water and ...

    we review the recent development of natural zeolites as adsorbents in water and wastewater treat-ment. The properties and modification of natural zeolite are discussed. Various natural zeolites around the world have shown varying ion-exchange capacity for cations such as ammonium and heavy metal ions.[...]

  • Adsorption of Xylene From Air by Natural Iranian Zeolite

    The optimum temperature of xylene adsorption on natural zeolite was 35℃ and by increasing temperature, the adsorption efficiency of natural zeolites was declined. It is important to note that the observed reverse trend in the breakthrough characteristic at higher temperatures was typical to most of the adsorbents/adsorbate system.[...]

  • Kinetic and Adsorption Isotherms Study of Cyanide Removal ...

    (100-300) for natural zeolite was fit into the Freundlich model and for impregnated zeolite type there was no significant difference between two models, although, the Langmuir model was more accurate. In a fraction size of (100-300) for two types of zeolites, the kinetic adsorption was fit into the Lagergren second-order kinetic model.[...]

  • Cd(II) Sorption on Iranian nano zeolites: Kinetic and ...

    An uptake of Cd(II) from aqueous solutions by ion exchange on Iranian natural zeolitic (TOSKA) has been studied. Experiments were carried out using batch method as a function of the initial concentration of metal ions, contact time, and temperature. The adsorbent is characterized using XRF, FTIR, TEM, and XRD. The TEM images showed that the zeolite particle sizes are reduced into the size ...[...]

  • Comparative and competitive adsorption of cadmium, copper ...

    Abstract. The competitive adsorption behavior of cadmium (Cd 2+), copper (Cu 2+), nickel (Ni 2+), and lead (Pb 2+) ions using Iranian natural zeolite has been studied in order to determine its applicability in treating industrial wastewater.Tests to determine both the rate of adsorption and the uptake at equilibrium were performed under batch conditions from single- and multi-component solutions.[...]

  • Removal of ammonia from air , using three Iranian natural ...

    removal of environmental pollutants such as ammonia by means of natural and modified zeolites has attracted a lot of attention and interests. In this study the capability of three Iranian natural zeolites (Clinoptilolite) in point of view of removal of ammonia from air was investigated.[...]

  • Synthesis of Zeolites, Merlinoite Minerals of Damavand’s ...

    Hamid Harati et al. / Iranian Journal of Earth Sciences 5 (2013) / 1-12 21 Synthesis of Zeolites, Merlinoite Minerals of Damavand’s Natural Clinoptiloite Zeolites Mineral in Hydrothermal Conditions, under the[...]

  • Iranian natural clinoptilolite and its synthetic zeolite P ...

    The ion-exchange behaviors of an Iranian natural clinoptilolite and its modified forms as well as a relevant synthetic zeolite P were investigated toward cerium and thorium from ... Iranian natural clinoptilolite and its synthetic zeolite P for removal of cerium and thorium from nuclear wastewaters. ... Natural Zeolites, Springer-Verlag, 1985.[...]

  • Ion exchangers in radioactive waste management: Natural ...

    Ion exchangers in radioactive waste management: Natural Iranian zeolites ... The natural zeolites chosen for these studies show a similar pattern to those synthetic ion exchangers in the literature and in some cases an extremely high selectivity towards certain radioactive elements. Hence the binary separation of radioactive elements could ...[...]

  • Cd(II) Sorption on Iranian Nano Zeolites: Kinetic and ...

    of cations can be adsorbed on zeolites by the cation exchange mechanism. Therefore, natural zeolites are known as efficient adsorbents for cation water pollutants[9]. The aim of this work was to determine the capacity of Iranian natural zeolite to remove cadmium ions from aqueous solutions and to predict and compare their performances from the[...]

  • Zeolite - Wikipedia

    Zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents and catalysts. The term zeolite was originally coined in 1756 by Swedish mineralogist Axel Fredrik Cronstedt, who observed that rapidly heating the material, believed to have been stilbite, produced large amounts of steam from water that had been adsorbed by the material.[...]

  • Case Study V: Natural Zeolites as Filter Material for ...

    Zeolites are known to improve many types of soil, due to their porosity, their water binding and ion exchange properties. He contacted me to roughly calculate how large and expensive such a filter would be, in which the material would have be exchanged four to six times a year. Natural zeolite and ammonia – some background[...]