Producing a synthetic zeolite from secondary coal fly ash

Abstract Using synthetic zeolite from fly ash to treat high concentration phosphorus wastewater does not only improve the utilization of fly ash as solid waste but also reduce the environmental pressure caused by eutrophication. A synthetic zeolite was prepared from coal fly ash by one-step hydrothermal synthesis and applied for phosphorus adsorption from industrial wastewater (∼8,000 mg-P/L), and its adsorption characteristics and performance were studied. The results indicated that the product was a well-crystallized Na-P1 zeolite with typical morphology of plate- and rod-shaped crystals. Compared with the original fly ash, the specific surface area and average pore volume of the synthetic zeolite were nine and six times larger than the fly ash, reaching 43.817 m2/g and 0.122 cm3/g. The results from phosphorus adsorption onto the synthetic zeolite showed that the synthetic zeolite had good phosphorus adsorption properties. The adsorption process highly conformed to the pseudo-second-order kinetic model with the regression coefficient R 2 of 0.998. Phosphorus adsorption on the synthetic zeolite was fitted to the Langmuir monolayer adsorption model, and the regression coefficient R 2 was 0.989. The maximum phosphorus adsorption capacity was 84.4 mg-P/g-zeolite.

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Thermal behavior and physical characteristics of synthetic zeolite from CFB-coal fly ash

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2015.08.036 ◽

2016 ◽

Vol 220 ◽

pp. 155-162 ◽

Cited By ~ 21

Author(s):

Agnieszka Grela ◽

Marek Hebda ◽

Michał Łach ◽

Janusz Mikuła

Keyword(s):

Fly Ash ◽

Thermal Behavior ◽

Coal Fly Ash ◽

Physical Characteristics ◽

Synthetic Zeolite

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Study on Washing Method of Hydrothermal Synthesis Zeolite from Coal Fly Ash

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.2687 ◽

2013 ◽

Vol 671-674 ◽

pp. 2687-2691

Author(s):

Hong Mei Cui ◽

Deng Mei Chen ◽

Meng Gao ◽

Li Bing Lu ◽

Ling Fei Ke

Keyword(s):

Fly Ash ◽

Hydrothermal Synthesis ◽

Surface Water ◽

Environmental Effects ◽

Coal Fly Ash ◽

Synthetic Zeolite ◽

Acid Water ◽

Microwave Assisted ◽

Washing Process ◽

Washing Method

The large amount of waste lye was generated during hydrothermal synthetic zeolite from coal fly ash by microwave-assisted heating. The environment will be polluted, if the improper handing of waste lye, and discharged into the surface water. The washing process of the synthetic zeolite was studied in this paper. Rational recycling of waste lye and reduce the amount of it emissions in the washing process were found. By comparing the environmental effects and the technical and economic, the method of washing with water-acid-water was determined to be the best solution of the zeolite washed. The waste lye can be recovered in this method, and it will be used for preparation of lye in the next synthetic zeolite. Cost was saved, and emissions of waste lye was reduced, too.

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Kinetics and Thermodynamic Studies of Cu(II) Ion Adsorption Onto Synthetic Zeolite Synthesized from Coal Fly Ash: Effect of the Co-Ions to the Total Adsorption

Oriental Journal Of Chemistry ◽

10.13005/ojc/350227 ◽

2019 ◽

Vol 35 (2) ◽

pp. 700-704

Author(s):

Ahmad Zakaria ◽

Witri Djasmasari ◽

Henny Rochaeni ◽

Yustinus Purwamargapratala ◽

Supriyono Supriyono

Keyword(s):

Fly Ash ◽

Adsorption Process ◽

Coal Fly Ash ◽

Synthetic Zeolite ◽

Kinetics Model ◽

Ion Adsorption ◽

Thermodynamic Studies ◽

Pseudo Second Order ◽

Total Adsorption ◽

Kinetics And Thermodynamic

Study of kinetics and thermodynamic of Cu(II) ion adsorption onto synthetic zeolite made of coal fly ash have been investigated. The aim of this research was to define the kinetics model and thermodynamic parameters such as Gibbs free energy (DG°), entropy (DS°), and enthalpy (DH°) of adsorption process of Cu(II) ion by synthetic zeolite made of coal fly ash. The effect of the presence of coexisting ion to the efficiency of Cu(II)adsorption had also been investigated. The experimental conditions were 5, 15, 30, 45, 60, 75, 90 minutes for the contact times and 27, 32, 37, 42°C for the temperature. The kinetics data were evaluated using a first-order and a pseudo second-order Lagergren equation. The results revealed that the kinetics data had good correlation with the pseudo second-order kinetics model. Thermodynamic studies indicated that the adsorption process was spontaneous with the increase in entropy and decrease in Gibbs energy. The coexisting Pb(II) or Mn(II) ions decreased the Cu(II) ion adsorption onto synthetic zeolite, but increased the total adsorption capacities.

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Synthesis of Zeolite A From Coal Fly Ash with Variation of Si/Al Molar Ratio

Jurnal ILMU DASAR ◽

10.19184/jid.v19i2.5910 ◽

2018 ◽

Vol 19 (2) ◽

pp. 105

Author(s):

Novita Andarini ◽

Tanti Haryati ◽

Zuhrotul Lutfia

Keyword(s):

Fly Ash ◽

Hydrothermal Treatment ◽

Coal Fly Ash ◽

Synthetic Zeolite ◽

Raw Material ◽

Molar Ratio ◽

Zeolite A ◽

X Ray ◽

Molar Ratios ◽

Aluminosilicate Mineral

Fly ash containing 30-36% silica and 14,52-23,78% alumina can be potentially as raw material for synthetic zeolite such as zeolite A. Zeolite A is an aluminosilicate mineral which is rich in alumina so that this zeolite has a good cation exchange capability. Zeolite A has been synthesized by hydrothermal treatment after NaOH fusion. Fly ash has been fused with NaOH at 550 0C for 40 minutes and hydrothermally treated at 1000C for 5 hours. The hydrothermal treatment was conducted in some various Si/Al molar ratios from 0.90; 1.00.; 1.05; to 1.24. The zeolite A was then analyzed using XRD and XRF. The best zeolite A based on XRD result is zeolite with Si/Al molar ratio of 1.1 with crystallinity of 96,80%. The x-ray fluorescence result showed that the Si/Al molar ratios of the four zeolite samples were close to of Si/Al molar ratios of 1, 1.1, 1.21.3 respectively.Keywords: Fly ash, Zeolite A, Hydrothermal Fusion

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