Amount Of Zeolite Research Articles

Performance evaluation of thermochemical energy storage system based on lithium orthosilicate and zeolite

High-temperature thermal energy can be produced from renewable power sources such as high-temperature gas-cooled reactors and high-temperature thermal processes, without environmental pollution. Integration of thermochemical energy storage (TcES) systems within power generation systems provides flexible options for future power generation. This study evaluates the performance of a TcES system based on Li4SiO4/zeolite/CO2 for thermal energy storage at ∼700 °C. Isothermal experiments with Li4SiO4, accessed through a solid-state reaction method, revealed that carbonation and decarbonation were almost complete after 5 and 150 min, respectively. The maximum gravimetric mean thermal output and input rates were 7.2 and 1.9 kW kg−1 for Li4SiO4 (59% porosity), respectively. Moreover, zeolite F-9 was examined as a pressure conditioning material by investigating the CO2 desorption profile at various CO2 pressures, and ∼15 wt% CO2 could be controlled. The zeolite showed good cycling durability and temperature responsiveness for four repeated cycles. Hence, the TcES system based on Li4SiO4 and the zeolite could be used for thermal energy storage at about 700 °C, and only temperature control was required to switch between the output and input modes. The amount of zeolite required by the proposed TcES system was 2.4 times (by weight) greater than that of Li4SiO4.

Poly(vinyl alcohol)/ZSM-5 zeolite mixed matrix membranes for pervaporation dehydration of isopropanol/water solution through response surface methodology

Mixed matrix membranes (MMMs) of poly(vinyl alcohol) (PVA) containing certain amounts of ZSM-5 zeolite were evaluated for pervaporation dehydration of highly concentrated isopropanol aqueous solution. The effects of zeolite content, feed composition and feed temperature on the membrane separation performance are in detail examined by using a preliminarily one-factor-each time method and a systematically response surface methodology (RSM). Preliminarily results show the dehydration separation factor/selectivity have been greatly boosted but without the cost of pervaporation flux/permeance after adding zeolite ZSM-5, and it is consistent very well with the Arrhenius activation energy estimations where water molecules require much less energy whereas ethanol molecules need much more energy to transport through the membrane, probably because of the favorable hydrophilic and porous features of zeolite ZSM-5 as revealed by swelling and water contact angle results. High feed isopropanol concentration and low feed temperature are both observed to lead to very low pervaporation flux/permeance but very relatively high separation factor/selectivity. The RSM results suggest that zeolite content, feed composition and feed temperature all have highly significant impacts on total pervaporation flux and separation factor. The interaction effect of zeolite content and feed temperature on separation factor is for the first time found to be also significant. The polynomial models established according to the RSM analysis can fit very well against the experimental data with a very high coefficient of determination and the predictions given for optimized conditions have been experimentally confirmed by the validation results with a deviation of less than 2.0%.

Effects of operational parameters on bio-oil production from biomass.

In this study, the production of bio-oil from the pyrolysis of furniture sawdust, waste lubricating oil and their mixtures were investigated under certain operating conditions in the presence of lime and zeolites, by using a laboratory scale horizontal tubular reactor placed in a furnace. The main focus was to investigate the mutual effect of lime and commercial zeolite on the amount of the bio-oil production from furniture sawdust and waste lubricating oil. The selected operating parameters were pyrolysis temperatures and heating rate of 300°C and 650°C and flash heating or gradual heating rate (30°C/min). Additionally, three different additives were tested as catalysts; namely, lime (CaO), commercial zeolite (4A) and a natural zeolite (klinoptilolite). The amount of the produced bio-oil was analyzed by gas chromatography-flame ionization detector. The distribution of solid, liquid and gaseous products was determined for each operational condition. It was seen that the amount of the bio-oil was influenced by the amounts of sawdust and zeolite in the mixture. Experimental results showed that higher temperatures were more effective for the higher bio-oil amount. Additionally, heating rate was quite significant at 300°C whereas it has a minor effect on the bio-oil amount at 650°C. The highest bio-oil yield was obtained for the mixture of sawdust and waste lubricating oil in the presence of both lime and commercial zeolite with flash heating rate at 650°C.

Effect of zeolite on the corrosion behavior, biocompatibility and antibacterial activity of porous magnesium/zeolite composite scaffolds

ABSTRACTIn the present study, porous magnesium-xzeolite (x= 0, 3, 5 and 7 wt.%) composite scaffolds containing different amounts of zeolite were synthesized through combination of powder metallurgy (PM) and space holder (SH) techniques. The findings demonstrated that incorporation of zeolite into Mg composite scaffolds leads to higher compressive strength and corrosion resistance than Mg scaffolds without Zeo. Moreover, the Mg/Zeo composite scaffold presented good bioactivity, high capability in MG63 cell attachment and viability whereas a smaller number of cells could attach to the Mg scaffold without Zeo. The antibacterial response of these Mg/Zeo-Ag composite scaffolds against Gram-positive Staphylococcus aureus (S. aureus) and Gram negative Escherichia coli (E. coli) indicates the positive role of silver-zeolite in suppressing the bacteria growth. The aforementioned tests indicated that the articulated magnesium composite scaffold containing 7 wt.% Zeo with suitable mechanical strength and excellent biological activity may be considered as a promising biomaterial for bone substitution.

Fabrication and Performance of Laterite East Kotawaringin-Zeolite/Chitosan Composite as Slow Release of Iron Fertilizer

Laterite soil is one of natural resources in East Kotawaringin regency, Central Kalimantan, Indonesia, which contains high element of Fe. Fe is one of micronutrients that is needed for plant in slight amount. This study aims to determine the effect of chitosan composition and composition of zeolite : laterite on the release of Fe activities from synthesized fertilizers result. Laterite is characterized by using XRF and XRD. Slow release iron fertilizer is synthesized by eliciting laterite to zeolite matrix. Then, It is stirred into chitosan gel with concentration of 2, 2.6, and 2.8 % for 30 minutes. After Zeolite - laterite - chitosan has been homogenized, then it is dropped into 0.4 M NaOH to form beads. Then testing the release of Fe with the batch method in distilled water. The result showed that the laterite soil is amorphous form, and Fe content reached 80.25 % . The higher the concentration of chitosan which is used , then more Fe is released from fertilizer. Whereas if the amount of zeolite is greater, the slower the release of Fe will be.

The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

ABSTRACTThe aim of this research was to determine the temperature of kaolin calcination in order to obtain an intermediate product (metakaolin) for the synthesis of geopolymers with potential application as self-supporting zeolitic membranes. The products obtained were analysed with X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The structural analysis of the metakaolins obtained suggested that the optimal temperature for the proposed application is 700°C. After alkali activation of metakaolin, it is possible to obtain zeolite A and hydroxysodalite. The factors analysed, determining the type and quantity of crystalline phases, were activation temperature and concentration of sodium hydroxide solution (activator). The largest amounts of zeolites were obtained by alkali activation with 9 mol/dm3 NaOH solution at 70°C.

Genesis of the Eastern Iranian bentonite deposits

Numerous bentonite deposits are located in Southern Khorasan (Eastern Iran), especially in Ferdows and Sarayan counties. We studied the genesis of these bentonites at seven deposits (Chah-Taleb, Chah-Keshmir, Chah-Golestan, Chah-Pirouz, Gholeh-Gelia, Kharman-Sar and Khal-Kooh) using petrological, mineralogical and geochemical data (including X-ray diffraction and fluorescence, and inductively coupled plasma-mass spectrometry) from both bentonites and parent rock samples. The deposits mainly consist of Na-montmorillonite and opaline silica, with lesser amounts of quartz, feldspars, carbonates, halite, zeolites, and illite. The studied deposits formed in a volcanic arc setting and their magma series are calc-alkaline, except for the Kharman-Sar deposit, which is tholeiitic in composition. The presence of significant amounts of opaline silica indicates a low fluid flow rate in these systems, in spite of the high leaching of alkalis.The strata-bound nature of the studied deposits, as well as the high amount of montmorillonite, the presence of gypsum layers alternating with those of bentonite and the lack of hydrothermal alteration suggest that these Iranian bentonite deposits were formed through diagenetic processes in lagoon environments, by means of the alteration of intermediate to acidic precursors, trachy-andesite to rhyolite, belonging to two volcanic provinces: one pyroclastic realm in Ferdows, and another volcaniclastic in Sarayan.

Lowering cement content in mortar by adding superfine zeolite as cement replacement and optimizing mixture proportions

Reducing the cement consumption in concrete construction is an effective method to lower the carbon footprint and alleviate global warming. One strategy is to replace part of cement by a cementitious or non-cementitious filler. Another strategy is to optimize the mixture proportions to minimize the cement content. Although these strategies have been separately adopted, there is little research on their combined adoption. To study the feasibility of combining these two strategies, a number of mortar samples with varying amount of superfine zeolite (SZ) added, binder/aggregate (B/A) ratio and water/binder (W/B) ratio were made for packing density, flowability, cohesiveness and strength tests. The results revealed that adding 5% SZ to replace cement would increase the packing density and flowability and decrease the cement/strength ratio by 17%–28%, depending on the other mixture parameters. There is an optimum B/A ratio for minimum cement/strength ratio, which is generally lower at lower strength level. The use of a suitable B/A ratio of 0.65 or 0.55 instead of a constant and conservative value of 0.75 at strength level lower than 60 MPa could reduce the cement content by about 10%.

An investigation on the capability of magnetically separable Fe3O4/mordenite zeolite for refinery oily wastewater purification

Damage to the water resources and environment as a consequence of oil production and use of fossil fuels, has increased the need for applying various technologies and developing effective materials to remove contaminates from oily wastewaters resources. One of the challenges for an economic industrial wastewater treatment is separation and reusability of the developed purifying agents. Development of magnetic materials could potentially facilitate easier and more economic separation of purifying agents. Therefore, herein we have synthesised an efficient and easily recyclable Fe3O4/mordenite zeolite using a hydrothermal process to investigate its purification capability for wastewater from Kermanshah oil refinery. The synthesised Fe3O4/mordenite zeolite was characterised using XRD, FTIR, SEM, EDX, XRF and BET analysis. XRD result showed that the synthesised Fe3O4/mordenite zeolite comprised sodium aluminium silicate hydrate phase [01-072-7919, Na8(Al6Si30O72)(H2O)9.04] and cubic iron oxide phase [04-013-9808, Fe3O4]. Response Surface Method (RSM) combined with Central Composite Design (CCD) was used to identify the optimum operation parameters of the pollutant removal process. The effect of pH, contact time and Fe3O4/mordenite zeolite amount on the Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD) and Nephelometric Turbidity Unit (NTU) were investigated. It was found that pH was the most significant factor influencing COD and BOD removal but the quantity of Fe3O4/mordenite zeolite was the most influential factor on the turbidity removal capacity. The optimum removal process conditions were identified to be pH of 7.81, contact time of 15.8 min and Fe3O4/mordenite zeolite amount of 0.52% w/w. The results show that the regenerated Fe3O4/mordenite zeolite can be reused for five consecutive cycles in purification of petroleum wastes.

Development of porous ceramic membrane from natural zeolite – clay for microfiltration

Indonesia has a large amount of natural zeolite and clay. These materials are potential for ceramic membrane production. The aims of this study were to describe the characteristic of ceramic membrane development from natural zeolite and clay. With an addition of TiO2, ceramic membrane was produced by dry process by pressing at 5 tons for 30 minutes. From the results of the investigation, it can be concluded that the natural zeolite and clay from Banyumas may be utilized for obtaining ceramic membranes for microfiltration at low sintering temperature of 900°C. Optimum addition of TiO2 was 5%wt. At this condition, the densities of ceramic membranes were 1.44 gr/cm3, 1.8 gr/cm3, and 1.5 gr/cm3. The porosities of ceramic membranes were 53.29%, 31.099%, and 35.42%. The water absorption values of ceramic membranes were 36.83%, 17.06%, and 23.61% for natural zeolite, clay, and natural zeolite – clay respectively.

Adsorption performance and thermodynamic analysis of SAPO-34 silicone composite foams for adsorption heat pump applications

In the present work, adsorption performances of an innovative composite adsorber, based on SAPO-34-silicone composite macro-cellular foams, are reported. The choice of a foamed structure was assessed to improve the water vapor access towards the embedded zeolite keeping good adsorption heat pump dynamic performance. Depending on zeolite amount used as filler, zeolite/silicone foams evidenced a soft and open cell configuration (low zeolite content) or rigid and closed one (high zeolite content). Morphological analysis evidenced that the cellular structure of the foam is homogeneous and well distributed along the foam cross section. Adsorption tests showed that the adsorbent foamed samples have very effective adsorption capabilities indicating that the porous structure of the filled pure zeolite was not obstructed. SAPO-34 filler contributed actively, with an efficiency above 90%, to the adsorption performances of the composite foam. Starting from experimental equilibrium data, a simple thermodynamic analysis based on energy balances was carried out for air conditioning application. Results of the analysis demonstrated that foam technology can guarantee cooling COP up to 7% higher than that estimated for the typical adsorber solution based on loose adsorbent grains inside an aluminum finned-flat tube heat exchanger, which is very promising for practical application in adsorption heat pumps.

Application of Fly Ash Derived Zeolites in Warm-Mix Asphalt Technology.

In recent years, numerous studies have been carried out on new technologies allowing to reduce of mix asphalt production temperatures. One of the possibilities is to foam the asphalt with “water-containing” additives, which include zeolites. So far, mainly synthetic zeolites of the Linde A structure type, obtained from chemical reagents, and natural clinoptilolite have been used in WMA technology. In this studies, the synthetic zeolites produced from fly ashes with 4 different types of crystalline structure were analyzed. Zeolite materials were characterized by textural parameters and thermal analysis. The amount of zeolite added to asphalt was 0, 3, 5, 7 wt % in relation to the weight of asphalt. Determination of dynamic viscosity was performed at two temperatures: 135 and 160 and 4 time intervals. The tests were performed for two asphalt binders: 35/50 and 100/150 penetration grade. As a conclusion, it was found that the viscosity of asphalt pastes with zeolitic materials increases with the increase in the amount of zeolite added. The increase level depends mainly on the textural parameters. The potential usefulness of fly ash derived zeolites in the process of asphalt foaming, which depends mainly on the amount of water contained in the zeolite structure and the method of its release, has been proved.

Cesium-adsorption capacity and hydraulic conductivity of sealing geomaterial made with marine clay, bentonite, and zeolite

Great amounts of soil and waste contaminated with radioactive cesium have been generated due to the decontamination work after the Fukushima Daiichi Nuclear Power Plant accident. The aim of this study is to develop a sealing geomaterial for use at the disposal facilities of the soil and waste constructed in the maritime environment. The geomaterial consists of marine clay, bentonite, and zeolite. The hydraulic conductivity and cesium-adsorption performance of the geomaterial were examined through laboratory tests with different proportions of bentonite and zeolite added to marine clay. It was concluded that the hydraulic conductivity could be reduced to the required level by increasing the amount of bentonite and that the cesium-adsorption capacity could be enhanced by increasing the amount of zeolite.

Amethyst Occurrences in Tertiary Volcanic Rocks of Greece: Mineralogical, Fluid Inclusion and Oxygen Isotope Constraints on Their Genesis

Epithermally altered volcanic rocks in Greece host amethyst-bearing veins in association with various silicates, carbonates, oxides and sulfides. Host rocks are Oligocene to Pleistocene calc-alkaline to shoshonitic lavas and pyroclastics of intermediate to acidic composition. The veins are integral parts of high to intermediate sulfidation epithermal mineralized centers in northern Greece (e.g., Kassiteres–Sapes, Kirki, Kornofolia/Soufli, Lesvos Island) and on Milos Island. Colloform–crustiform banding with alternations of amethyst, chalcedony and/or carbonates is a common characteristic of the studied amethyst-bearing veins. Hydrothermal alteration around the quartz veins includes sericitic, K-feldspar (adularia), propylitic and zeolitic types. Precipitation of amethyst took place from near-neutral to alkaline fluids, as indicated by the presence of various amounts of gangue adularia, calcite, zeolites, chlorite and smectite. Fluid inclusion data suggest that the studied amethyst was formed by hydrothermal fluids with relatively low temperatures (~200–250 °C) and low to moderate salinity (1–8 wt % NaCl equiv). A fluid cooling gradually from the external to the inner parts of the veins, possibly with subsequent boiling in an open system, is considered for the amethysts of Silver Hill in Sapes and Kassiteres. Amethysts from Kornofolia, Megala Therma, Kalogries and Chondro Vouno were formed by mixing of moderately saline hydrothermal fluids with low-salinity fluids at relatively lower temperatures indicating the presence of dilution processes and probably boiling in an open system. Stable isotope data point to mixing between magmatic and marine (and/or meteoric) waters and are consistent with the oxidizing conditions required for amethyst formation.

Effect of Nano Zeolite on the Transformation of Cadmium Speciation and Its Uptake by Tobacco in Cadmium-contaminated Soil

Abstract The study was aimed at exploring the effects of applying ordinary and nano zeolite on the soil pH, soil available cadmium (Cd) content, soil Cd speciation and Cd uptakes by tobacco using pot experiment with simulated Cd contaminated soil indoors. The results showed that soil pH increased and available Cd content reduced with the amount of ordinary and nano zeolite increasing. Compared with the control, the application of ordinary and nano zeolite increased soil pH at 0.47 - 1.05 and 0.73 - 1.57, respectively, and reduced the available Cd contents at 19.3% - 32.7% and 23.2% - 40.5%, respectively. In addition, soil pH had significantly negative correlation with available Cd content in each treatment (p<0.05). Nano zeolite could more effectively reduce Cd contents of all parts of tobacco than ordinary zeolite with the same amount treatments, and Cd content in all parts of tobacco plants was positively correlated with soil available Cd content. The content of exchangeable Cd (EXE) in soil decreased to some extent with different zeolite treatments, application of nano zeolite was better than that of application of ordinary zeolite in reducing Cd bioavailability and transferability. Overall, application of nano zeolite has an advantage over ordinary zeolite in reducing available Cd content in soil and Cd content in tobacco.

Synthesis and properties of magnetic zeolite with good magnetic stability from fly ash

Magnetic fly ash-based zeolites (MFZ) with good magnetic stability were in situ synthesized from fly ash (FA) modified by Fe3O4 after alkali fusion, hydrothermal treatment, and followed by reduction. The effects of the synthesis parameters of MFZ, such as the loading amount of Fe3O4, NaOH/FA ratio, and SiO2/Al2O3 molar ratio, were investigated as well as its adsorption capacity for Cu2+ ions. The results indicated that MFZ were composed of zeolite A and sodalite phases and possessed excellent magnetic property. Fe3O4 nanoparticles were encapsulated in or covered below the as-synthesized zeolites, resulting in a good magnetic stability of MFZ. The magnetic property and crystal type of MFZ could be adjusted by controlling the synthesis parameters. High loading amount of Fe3O4 hindered the leaching of active SiO2 from FA and then limited the formation of zeolite A. MFZ exhibited a high adsorption capacity for Cu2+ ions and the latter increased with the amount and crystallinity of zeolite A in MFZ.

Ultrafast screening of commercial sorbent materials for VOC adsorption using real-time FTIR spectroscopy

Abstract Recovery of valuable volatile organic compounds (VOCs) from waste streams is of great industrial importance. Adsorption on zeolites offers an economically and environmentally friendly alternative to conventional activated carbon. When evaluating the suitability of a given zeolite for a particular adsorption application, its adsorption capacity has to be determined. This is traditionally achieved using gas chromatography as an analysis tool, yielding only a few discrete sampling points that constitute the adsorption profile. Meanwhile, only low flow rates and low concentrations of volatile organics can be used, rendering the procedure troublesome and time consuming. Herein, we propose a tool for the fast screening of a large amount of zeolites using on-line and quasi real-time Fourier Transform Infrared Spectroscopy (FTIR). The technique was used to determine the adsorption capacity of three different commercial zeolites and two silica gels, for five industrially relevant VOCs: acetone; methanol; isohexane; isopentane; and toluene. A series of rapid measurements of the individual adsorption capacities were carried out to obtain a detailed overview of the versatility of the proposed method for the characterization of multi-component and multi-sorption bed systems.

A recyclable adsorbent for salinized groundwater: Dual-adsorbent desalination and potassium-exchanged zeolite production

This study focused on advancing the dual-adsorbent desalination technique that sequentially combines calcined layered double hydroxide (CLDH) and acid-treated zeolites (H-form zeolite) using groundwater spiked with potash mining effluent (brine). In sequential batch experiments, the CLDH adsorbent first reduced the high Cl− concentration (4600 mg/L) of saline groundwater by 96%, the Ca2+ by 90%, and the Mg2+ by 92%, while transiently raising the pH to 12.80. H-form zeolites preconditioned with Na+ then removed 92% of the Na+ (2010 mg/L), while neutralizing the adsorption effluent pH to 7.7 and lowering the sodium adsorption ratio (SAR; 139.6 to 6.6) and the hardness (574 to 48.4 mg/L). In comparison, an equivalent amount of unmodified zeolite removed only 51% of the Na+ and generated extremely hard water due to Ca2+ and Mg2+ release (1519 mg/L). Na+-conditioning the zeolites prior to acid treatment enhances native cation removal, forming H-form zeolites. Synchrotron-based X-ray scanning transmission microscopy (STXM) showed the occurrence of dealumination and visualized the sodium distribution associated with Si and Al sites in the H-form zeolites. Four consecutive desalination cycles were feasible for Na+ and K+ adsorption by regenerating the H-form zeolite. During regeneration, the Na+ desorbed while the K+ remained in the regenerated zeolites. Cumulative K+ loading in the regenerated zeolites increased from 4.8 to 21.2 mg/g, producing K-form zeolites. These K-form zeolites released K+ (2.15 mg/L for 24 h) in a leaching test and could potentially be considered as nutrient-supply media in other applications, thereby recycling the spent zeolites after multiple desalination treatments.

EMT-type zeolite for deep purification of trace polar-oxygenated compounds from light olefins

Pure EMT-type zeolite (EMC-2) was synthesized using 18-crown-6 ether as structure direction agent and first applied for deeply purification the trace polar-oxygenated compounds from light olefins as well as studying the removal mechanism. This EMC-2 zeolite crystals exhibited high crystallinity, regular hexagonal platelet morphology mainly with diameter of 3–4 μm, thickness of 350 nm. The N2 adsorption/desorption analyzer indicated the EMC-2 zeolite had both micropores and inter-particle mesopores. The BET surface area, total pore volume and average pore size were 599.5 m2/g, 0.347 cm3/g and 2.32 nm, respectively. By dynamic adsorption experiment at room temperature, the results demonstrated that the EMC-2 zeolite could deeply purify the trace polar-oxygenated compounds to below 1 × 10−6 mol/mol in N2 or C2H4 flow, and exhibited more excellent purification performance than that of 13X zeolite. The breakthrough time for methanol to 1.18 g EMC-2 zeolite was 73.0 h in N2 system, and 6.0 h to 0.31 g EMC-2 zeolite in C2H4 system. The cumulative adsorption amounts of EMC-2 zeolite for methanol and propanal in N2 and C2H4 system were 55.99 mg/g, 113.93 mg/g and 98.17 mg/g, 171.61 mg/g, respectively. Moreover, the regeneration experiment also demonstrated the EMC-2 zeolite had more stable structure and longer lifetime. The in-situ FTIR spectra indicated both the purification processes of EMC-2 zeolite for methanol and propanal were physi-sorption mainly via the interaction between the oxygen lone-pair electrons of impurities and the Na+ of EMC-2 zeolite. Therefore, the EMC-2 zeolite had great potentials for future industrial application of trace polar-oxygenated compounds removal from light olefins.

Kinetics and Adsorption Isotherms Study of Cyanide Removal from Gold Processing Wastewater Using Natural and Impregnated Zeolites

The extraction of gold involves using cyanide which has the potential to impact the environment. Many studies have been done to reduce the environmental effects of cyanide. In this research, the cyanide adsorption on zeolite from gold processing plant tailing dam wastewater was investigated. Results indicated that the pH of the solution, contact time duration, temperature, zeolite amount and size of zeolite particles were the most important parameters in the adsorption process. Zeolite was used in two fraction sizes; (100-300)m and (300-1000)m in two types of natural and impregnated with copper sulfates. The optimum amounts of both natural and impregnated zeolite in the solutions and the maximum cyanide adsorption percentage were determined as 30, 24g/L and 50.2, 86.1% for small fraction size, and 36, 24g/L and 39.5, 64% for large fraction size, respectively. The optimum values of pH were 10.5 and 10 for natural and impregnated types in both fraction sizes. Contact time duration in equilibrium conditions for fraction sizes of (100-300)m and (300-1000)m were 40 and 50 min, respectively. The optimum temperature in all situations was 22 oC. The adsorption process in a size of (100-300)m 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)m for two types of zeolites, the kinetic adsorption was fit into the Lagergren second-order kinetic model. In a fraction size of (300-1000)m, the adsorption kinetics for the natural type has no sensible difference between the first and second Lagergren kinetic model, but for the impregnated zeolite type it follows the second-order kinetic model. The results showed that the cyanide adsorption on impregnated zeolite was more than the natural type.