Recycling of coal fly ash : synthetic zeolite 4A and MCM-41

2004 ◽  
Author(s):  
Kwan San Hui
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Synthetic Zeolite ◽  
Zeolite 4A ◽  
Mcm 41

scholarly journals Coal Fly Ash Derived Silica Nanomaterial for MMMs—Application in CO2/CH4 Separation

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 78
Author(s):  
Marius Gheorghe Miricioiu ◽  
Violeta-Carolina Niculescu ◽  
Constantin Filote ◽  
Maria Simona Raboaca ◽  
Gheorghe Nechifor
Keyword(s):  
Fly Ash ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Coal Fly Ash ◽  
High Surface ◽  
Industrial Applications ◽  
Mixed Matrix Membranes ◽  
Co2 Removal ◽  
Mcm 41

In order to obtained high selective membrane for industrial applications (such as natural gas purification), mixed matrix membranes (MMMs) were developed based on polysulfone as matrix and MCM-41-type silica material (obtained from coal fly ash) as filler. As a consequence, various quantities of filler were used to determine the membranes efficiency on CO2/CH4 separation. The coal fly ash derived silica nanomaterial and the membranes were characterized in terms of thermal stability, homogeneity, and pore size distribution. There were observed similar properties of the obtained nanomaterial with a typical MCM-41 (obtained from commercial silicates), such as high surface area and pore size distribution. The permeability tests highlighted that the synthesized membranes can be applicable for CO2 removal from CH4, due to unnoticeable differences between real and ideal selectivity. Additionally, the membranes showed high resistance to CO2 plasticization, due to permeability decrease even at high feed pressure, up to 16 bar.

Preparation, characterization and adsorption evaluation of spherical mesoporous Al-MCM-41 from coal fly ash

2015 ◽  
Vol 52 ◽  
pp. 147-157 ◽  
Author(s):  
Chunyu Zhou ◽  
Qiang Gao ◽  
Wenjun Luo ◽  
Qi Zhou ◽  
Hongquan Wang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Mcm 41

Producing a synthetic zeolite from secondary coal fly ash

2016 ◽  
Vol 37 (22) ◽  
pp. 2916-2923 ◽  
Author(s):  
Chunyu Zhou ◽  
Chunjie Yan ◽  
Qi Zhou ◽  
Hongquan Wang ◽  
Wenjun Luo
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Synthetic Zeolite

scholarly journals Synthesis of zeolite from fly ash and its adsorption of phosphorus in wastewater

2021 ◽  
Vol 10 (1) ◽  
pp. 349-360
Author(s):  
Kecheng Zhang ◽  
Lizelle Van Dyk ◽  
Dongsheng He ◽  
Jie Deng ◽  
Shuang Liu ◽  
...  
Keyword(s):  
Fly Ash ◽  
Regression Coefficient ◽  
Coal Fly Ash ◽  
Synthetic Zeolite ◽  
Order Kinetic ◽  
Adsorption Model ◽  
High Concentration ◽  
Average Pore ◽  
Phosphorus Adsorption ◽  
And Performance

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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