Synthesis of submicron zeolite LTA particles from natural clinoptilolite and industrial grade chemicals using one stage procedure

Kazemian, Hossein; Modarress, Hamid; Kazemi, Masoud; Farshid, Farhadi

doi:10.1016/j.powtec.2009.06.017

Cited by 28 publications

(21 citation statements)

References 9 publications

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“…Coal-red power plants are producing larger quantities of y ash annually [1][2][3] . Large amount of y ash is being disposed of in opened land ll sites, creating problems with air, groundwater and soil pollution with harmful elements [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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Acid-extracting residue of circulating uidized bed (CFB) y ash is still underutilized leaving disposal problems. In fact, high silica content inside this material opens a possibility to become a potential zeolites precursor. In this study, ne particles of acid residues have been reused to prepare zeolite Na-X and Na-P with high purity and intensity. Acid residue was used to synthesize zeolite Na-X and Na-P using a single-step hydrothermal process. The effects of crystallization time, temperature and sodium hydroxide concentration on the end products were investigated. The results revealed that crystallization time and temperature determined whether or not zeolite Na-X or Na-P was formed. The zeolites were characterized in terms of their mineralogical composition, morphology, and fourier-transform infrared spectroscopy.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

et al. 2016

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“…In our previous works, natural clinoptilolite-rich tuffs were converted into zeolite P using hydrothermal processes [13]. Recently, a simple, fast and cheap single step procedure was also developed by our group to synthesize submicron zeolite LTA using a natural clinoptilolite-rich tuff [14]. Surface modification of zeolites can lead to suitable adsorbents for anionic and molecular contaminants as well [15,16].…”

Section: Introductionmentioning

confidence: 99%

Removal of Petroleum Aromatic Hydrocarbons by Surfactant‐modified Natural Zeolite: The Effect of Surfactant

Torabian

Kazemian

Seifi

et al. 2010

CLEAN Soil Air Water

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Monoaromatic hydrocarbons including benzene, toluene, ethylbenzene and xylene isomers (BTEX) are a very important category of water pollutants. These volatile compounds are very hazardous because of their fast migration in soil and water bodies and their acute and chronic toxicities when inhaled or ingested, especially benzene which is a known carcinogenic molecule. In this study, a natural zeolite (i. e., clinoptilolite-rich tuffs) was modified by two cationic surfactants (i. e., hexadecyltrimethyl ammonium chloride (HDTMA-Cl), and N-cetylpyridinium bromide (CPB)). The prepared adsorbents were then characterized, and their adsorptive capabilities for BTEX examined at different experimental conditions. The results of adsorption tests at 24 h revealed that the adsorption capacity of the modified zeolites improved by increasing the surfactant loading (i. e., less than the critical micelle concentration (CMC), to higher than the CMC), which caused an increase in sorption capacity from 60 to 70% for HDTMA-modified samples, and from 47 to 99% for CPB-modified zeolite. Adsorption kinetic tests showed the optimum contact time was 48 h with an average BTEX removal of 90 and 93% for HDTMA-modified and CPB-modified zeolite, respectively. Results showed that by increasing of pH from 3 to 11, the sorption capacity of the adsorbent decreased markedly from 97 to 75%. Analyzing the influence of temperature showed that the adsorption efficiency of adsorbents for benzene reduced from 93% at 208C to 10% at 48C. However, the influence of temperature on other compounds was not remarkable. Overall, CPB-modified zeolite exhibited higher selectivity toward BTEX compounds at optimum experimental conditions. Although commercial powder activated carbon (PAC) showed a higher capacity for all BTEX compounds and faster adsorption kinetics, the adsorption capacity of the CPB-modified zeolite at optimized conditions was competitive with PAC results.

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“…These crystalline materials may be produced naturally or synthesized in laboratory [8][9][10][11]. In order to synthesize a specific type of zeolite, appropriate ingredients should be used, their ratio in the reaction mixture should be accurately adjusted, and special attention should be given to the temperature and crystallization time [12].…”

Section: Introductionmentioning

confidence: 99%

Prediction of degree of crystallinity for the LTA zeolite using artificial neural networks

Ghanbari

Vaferi

2017

Materials Science-Poland

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Zeolites are microporous aluminosilicate/silicate crystalline materials with three-dimensional tetrahedral configuration. In this study, the degree of crystallinity of the synthesized Linde Type A (LTA) zeolite, which is the main indicator of its quality/purity is tried to be modeled. Effect of crystallization time, temperature, molar ratio of the synthesis gel on the relative crystallinity of the LTA zeolites is investigated using artificial neural networks. Our experimental observations and some data collected from literature have been used for adjusting the parameters of the proposed model and evaluating its performance. It has been observed that two-layer perceptron network with eight hidden neurons is the most accurate approach for the considered task. The designed model predicts the experimental datasets with a mean square error of 3.99 × 10 −6 , absolute average relative deviation of 8.69 %, and regression coefficient of 0.9596. The proposed model can decrease the required time and number of experiments to evaluate the extent of crystallinity of the LTA zeolites.

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Synthesis of submicron zeolite LTA particles from natural clinoptilolite and industrial grade chemicals using one stage procedure

Cited by 28 publications

References 9 publications

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Synthesis of Pure Na–X and Na–P Zeolite from Acid-Extracting Residues of CFB Fly Ash by a Single-Step Hydrothermal Method

Removal of Petroleum Aromatic Hydrocarbons by Surfactant‐modified Natural Zeolite: The Effect of Surfactant

Prediction of degree of crystallinity for the LTA zeolite using artificial neural networks

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