Optimization of synthesis parameters and characterization of coal fly ash derived microporous zeolite X

Sivalingam, Sivamani

doi:10.1016/j.apsusc.2018.05.222

Cited by 75 publications

(26 citation statements)

References 22 publications

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“…All researchers have paid a particular attention to different zeolites crystallization temperature due to its strong impact on the zeolite membranes' crystallinity, size and their purity, i. e. phase content [47,48]. The desired 13X zeolite phase only can be obtained within the specific temperature range as was found in the range of 80°C-100°C in the current study.…”

Section: The Synthesis Temperature Effect(s) On the Membranes Separatmentioning

confidence: 59%

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Pourazar¹,

Mohammadi²,

Nasr³

et al. 2020

Mater. Res. Express

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The Plackett-Burman method was used to identify and rank most affective parameters on hydrothermal synthesis and properties of the 13X zeolite powder with gel composition of Al 2 O 3 :aSiO 2 :bNa 2 O:cH 2 O. The affective parameters of SiO 2 /Al 2 O 3 ratio, synthesis mixture alkalinity, synthesis temperature, and water content were selected for further study of their impacts and gel composition optimization using the Taguchi method. The synthesized powders were characterized by XRD and SEM analysis. Synthesis temperature and mixture alkalinity were found as the most affecting parameters on the 13X zeolite synthesis at the best gel composition of Al 2 O 3 :5.4SiO 2 : 13Na 2 O: 840H 2 O. Then 13X zeolite membranes were synthesized on the seeded supports using the optimum gel composition and impacts of synthesis temperature and time and coating layer number on their H 2 and CO 2 permeances and ideal H 2 /CO 2 selectivity were studied. The optimum 13X zeolite membrane for H 2 /CO 2 separation was obtained by three layer coatings at 80°C for 16 h with H 2 permeance of 2.88 cm 3 cm −2 .Pa.s and ideal H 2 /CO 2 selectivity of 4.72.

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Section: The Synthesis Temperature Effect(s) On the Membranes Separatmentioning

confidence: 59%

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Pourazar¹,

Mohammadi²,

Nasr³

et al. 2020

Mater. Res. Express

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“…The bending and stretching The FTIR spectra of ZFA in the wavenumber region from 4000 to 400 cm −1 are shown in Figure S2. The band at 468.70 cm −1 corresponded to the Si-O or Al-O flexural vibration, and the 669.30 cm −1 was assigned to the stretching vibration of the tetrahedral structure [13]. The strong absorption peak at 1033.34 cm −1 should belong to the Si-O-Si skeletal vibration [24].…”

Section: Characterization Of Materialsmentioning

confidence: 99%

“…The zeolite 2 of 15 prepared from raw fly ash often has a low adsorption capacity for ammonium, and its application was limited in the field of high concentration wastewater [11]. Therefore, some suitable pretreatments of raw fly ash before a conventional hydrothermal process and optimum synthesis parameters before use are necessary to acquire a higher adsorption capacity for ammonium [12,13].…”

Section: Introductionmentioning

confidence: 99%

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

Tang

Wang

et al. 2020

Sustainability

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Synthetic zeolites with pretreated fly ash as a raw material were used to remove ammonium from wastewater using a hydrothermal method in this study. Two pretreatment methods of fly ash were used to compare the ammonium removal of zeolites: water-washing and pickling. In addition, the effects of several factors including the time, temperature, pH, adsorbent dosage, coexisting ions and initial concentration were investigated to gain insight into the adsorption rate, behavior and mechanism of synthetic zeolites for ammonium. N2 adsorption/desorption isotherms showed that the synthetic zeolite was a mesoporous material with a higher specific area (13.05 m2/g) than the values for raw fly ash (0.34 m2/g). The X-ray diffraction result suggested that the synthetic products mainly belonged to zeolite P and Y. The adsorption kinetic data fitted well with a pseudo-second-order model. The maximum ammonium adsorption capacity was 32.16 mg/g. The synthetic zeolites were also applied to adsorb the ammonium from real swine wastewater. The ammonium removal efficiencies in raw swine wastewater and effluent from the biochemical unit were 64.34% and 79.61%, respectively, which indicated that the synthetic zeolites have a good application for real ammonium wastewater.

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“…The peaks at 795 cm À1 and 1086 cm À1 represent the anti-symmetric stretching vibration of Si-O-Si, while the peak at 557 cm À1 represents the stretching vibration of Al-O in the AlO 6 group. 22,23 The three peaks correspond to the existence of mullite and quartz. The peak at 457 cm À1 is the characteristic peak of the bending vibrations of the [FeO 6 ] group.…”

Section: Optimization Of Activation Conditionmentioning

confidence: 99%

A microwave-activated coal fly ash catalyst for the oxidative elimination of organic pollutants in a Fenton-like process

Wang

Han

2019

RSC Adv.

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Optimization of synthesis parameters and characterization of coal fly ash derived microporous zeolite X

Cited by 75 publications

References 22 publications

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Preparation of 13X zeolite powder and membrane: investigation of synthesis parameters impacts using experimental design

Removal of Ammonium from Swine Wastewater Using Synthesized Zeolite from Fly Ash

A microwave-activated coal fly ash catalyst for the oxidative elimination of organic pollutants in a Fenton-like process

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