Synthesis of granular zeolitic materials with high cation exchange capacity from agglomerated coal fly ash

Juan, Roberto; Hernández, Santiago Cortés; Andrés, José Manuel Palao; Ruiz, Carolina Castillo

doi:10.1016/j.fuel.2007.01.011

Cited by 62 publications

(25 citation statements)

References 12 publications

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“…From Table 1, the iron oxide content of the fly ash sample was reduced to 65% after treating it by magnetic separation technique. Fe content was associated with the presence of magnetite which can behave as an inert material for zeolite synthesis 23 . The total amounts of SiO 2 , Al 2 O 3 , and CaO were 35.95, 22.52, and 23.47 wt.…”

Section: Characterization Of Starting Materialsmentioning

confidence: 99%

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Thuadaij¹,

Nuntiya²

2012

ScienceAsia

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In this study, a Na-x zeolite was synthesized by using metakaolin from Narathiwat kaolinite, amorphous silica from rice husk ash, and high CaO fly ash from the Mae Moh electrical plant by using the alkaline fusion method. The mixture of fly ash, amorphous silica and metakaolin was fused in NaOH followed by incubation at 70°C for 24 h. An amorphous silica from rice husk ash and metakaolin were added to high CaO fly ash to increase the SiO 2 /Al 2 O 3 ratio of fusion materials. The fused mixtures of high CaO fly ash, amorphous silica and metakaolin were mixed in the weight ratio of 1:3:6 giving a SiO 2 /Al 2 O 3 ratio of 3.25 to achieve a Na-x zeolite phase. The synthesized zeolite was characterized by XRD, SEM, FTIR, and BET techniques. The CEC and specific surface area of the Na-x zeolite were 420 meq 100 g −1 and 398 m 2 /g, respectively.

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Section: Characterization Of Starting Materialsmentioning

confidence: 99%

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Thuadaij¹,

Nuntiya²

2012

ScienceAsia

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“…Fe is usually present in the form of magnetite which could behave as inert material for zeolite synthesis. Through the formation of calcium silicate, Ca-compounds could also act as a zeolite synthesis inhibitor [19]. The higher SSA of HC-Z may be mainly attributed to the formation of rough surface.…”

Section: Adsorbentmentioning

confidence: 99%

Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Zhang

et al. 2011

Desalination

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Keywords:Low-calcium fly ash High-calcium fly ash Synthesized zeolite Ammonium removal Select criteria of raw fly ash In this study, zeolites are synthesized from low-calcium (LC-Z) and high-calcium (HC-Z) fly ashes, respectively. The changes of mineralogy, morphology, cation exchange capacity (CEC) and specific surface area (SSA) are investigated during the synthesis process. The equilibrium uptake of ammonium on the two synthesized zeolites is compared. The main crystals of LC-Z and HC-Z are identified as faujasite and gismondine, respectively. The CEC and SSA increase significantly following the conversion process. The kinetic studies showed that the adsorption process of ammonium on both LC-Z and HC-Z follows Ho's pseudosecond-order model. Langmuir model agrees better with the equilibrium data for LC-Z, while Freundlich model gives the better fit for HC-Z. The obtained maximum ammonium uptake capacities are 23.8 mg/g for LC-Z and 3.17 mg/g for HC-Z in the synthetic solution. LC-Z also exhibits much better performance in ammonium uptake in effluent from a sewage treatment plant than HC-Z. These results indicate that LC-Z is a promising material for ammonium removal whereas HC-Z is not. The Ca 2+ leaching and the lower zeolite content in HC-Z account for its lower uptake capacity. Thus, the low-calcium fly ash should be chosen preferentially as the raw material of the zeolite synthesis for ammonium removal.

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“…Coal fly ash consists of both amorphous aluminosilicate material and crystalline phases, mainly a-quartz (SiO 2 ), mullite (3Al 2 O 3 Á2SiO 2 ), hematite (a-Fe 2 O 3 ) and magnetite (Fe 3 O 4 ) [8,9]. This composition allows the conversion of these ashes into zeolites through hydrothermal treatment, for example [10][11][12][13][14]. Zeolites are hydrated, crystalline and microporous aluminosilicates structured into three-dimensional networks of TO 4 (T = Si, Al) tetrahedra joined at the corners by oxygen atoms.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of zeolite Na-P1 under mild conditions using Brazilian coal fly ash and its application in wastewater treatment

Cardoso

Paprocki

Ferret

et al. 2015

Fuel

151

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Synthesis of granular zeolitic materials with high cation exchange capacity from agglomerated coal fly ash

Cited by 62 publications

References 12 publications

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Effect of the SiO2/Al2O3 ratio on the synthesis of Na-x zeolite from Mae Moh fly ash

Ammonium removal from aqueous solution by zeolites synthesized from low-calcium and high-calcium fly ashes

Synthesis of zeolite Na-P1 under mild conditions using Brazilian coal fly ash and its application in wastewater treatment

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