Microwave-assisted preparation of zeolite K–H from alumatrane and silatrane

Sathupunya, Mathavee; Gülari, Erdogan; Jamieson, A. M.; Wongkasemjit, Sujitra

doi:10.1016/j.micromeso.2004.02.003

Cited by 15 publications

(15 citation statements)

References 28 publications

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“…Specifically, The XRD pattern (see Figure 1b) of the crystal phase formed by K-A-S-H0.5 2 -7d-95 closely matched that of zeolite K-H, with PDF#16-0692, K 2 Al 2 Si 4 O 12 •xH 2 O, Si:Al:K = 2:1:1, which is classified as an unknown structure type. Similar results were also reported by Sathupunya et al [18] and Liu et al [19]. In addition, K-G zeolite (K 2 Al 2 SiO 6 •H 2 O, PDF#12-1094) [20] crystalline phase was observed in the sample K-A-S-H2.0 2 -7d-95, and weak diffraction peaks of zeolite K-H and K-G zeolite were observed in sample K-A-S-H1.0 2 -3d-95.…”

Section: X-ray Diffraction Analysissupporting

confidence: 92%

Insights into the Microstructure of Hydrothermal Synthesized Nanoscale K2O-Al2O3-SiO2-H2O Particles

et al. 2019

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K-A-S-H (K2O-Al2O3-SiO2-H2O) gel is a key phase that forms in most alkali-activated binders (eco-friendly binders which utilize a substantial amount of industrial by-product). An in-depth understanding of the microstructure and performance of this nano-sized key phase facilitates better application to alkali-activated binders. However, such studies remain little and undetailed. Therefore, our research aims to provide insights into the microstructure of K-A-S-H particles synthesized with accurate stoichiometric control by the hydrothermal method through thermogravimetric analysis (TG), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and BET surface area. The results show that for materials prepared at the curing temperature lower than 80 °C, the K-A-S-H products were completely amorphous. With increased curing temperature and time, the K-A-S-H products were transformed from the amorphous phase to the crystalline zeolite phase structure, with a reduction in the specific surface area. The TG results indicate that the crystalline phase contains more non-evaporated water or zeolite water for structural rearrangement. The degree of tetrahedral polymerization slightly decreased with an increase of the K2O/SiO2 ratio as the amount of non-bridged oxygen atoms increased, whereas it gradually increased with an increase of curing temperature and time, as suggested by the FTIR and NMR results. Various K2O/SiO2 ratios resulted in the formation of zeolite K-H and K-G zeolite, both of which exhibited highly polymerized three-dimensional network structures. However, there was no significant effect of the SiO2/Al2O3 ratio on the structure of K-A-S-H products. Overall, these results provide insight into understanding the chemical stability of K-A-S-H.

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Section: X-ray Diffraction Analysissupporting

confidence: 92%

Insights into the Microstructure of Hydrothermal Synthesized Nanoscale K2O-Al2O3-SiO2-H2O Particles

et al. 2019

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“…The Si:Al:K ratio of Z/Dt obtained via EDS was 1.88:1:0.95, which was consistent with the formula for zeolite K-H and the previously reported result (1.98:1:0.82) in the previous report [38]. It is noteworthy that the structure of zeolite K-H has remained unclear until now, and its structure type is still unknown [38,39]. Moreover, the exact formation mechanism of Z/Dt, such as the roles of the TPAOH template, has not been confirmed and requires further investigation.…”

Section: Zeolite Byproductsupporting

confidence: 92%

“…These results demonstrate that the zeolite could be synthesized and the synthesis method was facile and economically feasible for the utilization of waste solutions from KOH-etched diatomite template and its simple processes under mild reaction conditions, such as the low temperature and pressure. The Si:Al:K ratio of Z/Dt obtained via EDS was 1.88:1:0.95, which was consistent with the formula for zeolite K-H and the previously reported result (1.98:1:0.82) in the previous report [38]. It is noteworthy that the structure of zeolite K-H has remained unclear until now, and its structure type is still unknown [38,39].…”

Section: Zeolite Byproductsupporting

confidence: 89%

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Preparation of porous diatomite-templated carbons with large adsorption capacity and mesoporous zeolite K-H as a byproduct

Liu

Yuan

Deng

et al. 2014

Journal of Colloid and Interface Science

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“…Microwave hydrothermal treatment is an effective heating tool in chemical synthesis with saving of energy and time and cost reduction. Several authors detected that heating is volumetric and penetration and distribution are done quickly and homogeneously to influence the reactive materials and prefer the early and simultaneous nucleation of the microcrystals with the distribution of narrow particle size (Sathupunya et al 2004;Youssef et al 2008). On the other hand, conventional heating resulted in crystals of different sizes due to the slow rise in temperature, which allowed the nucleation to continue throughout the reaction period (Sathupunya et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Effect of nanopolysaccharide (BSEPS) from Bacillus subtilis sp. on thioacetamide-induced liver fibrosis in rats

et al. 2019

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Background: Nanomedicine contributes to the efficiency of pharmacological treatments and progresses rapidly. The present study was designed to produce exopolysaccharide (BSEPS) from Bacillus subtilis sp. strain reported in our previous study was further characterized, and its BSEPS for synthesis of the nanoparticle Ag-BSEPS using microwave heating to determine the possible effects of a prepared solution containing Ag-BSEPS versus thioacetamide (TAA) evoked liver fibrosis in Wister albino rats. Nanoparticles with silver (Ag) core have been synthesized in an aqueous solution after exposure of BSEPS to periodate oxidation. Animals were split into four groups: I-control rats, water ad libitum for 6 weeks; II-rats were injected with TAA 200 mg/kg-1 3 times/week for 4 weeks IP; III-Ag-BSEPS 100 mg/kg-1 IP twice a week for 6 weeks; and IV-TAA, as group II followed by Ag-BSEPS as group III. The antifibrotic effects of Ag-BSEPS were appraised by determining different hepatotoxicity indices, oxidative stress, and inflammatory and liver fibrosis markers. Results: Nanoparticles were obtained with a diameter size range of 50-100 nm characterized by SEM and TEM without using any harmful reagents. Results evinced considerably reduced activity of liver functions such as transaminases (AST, ALT), gamma-glutamyl transferase (GGT), and alkaline phosphatase (ALP) in the group which received TAA followed by Ag-BSEPS compared to the other group which received only TAA. In the current results, the administration of Ag-BSEPS showed an improvement in the proinflammatory cytokines. On the contrary, the antioxidant enzymes in liver homogenates revealed significant improvement (concentration of glutathione peroxidase (GSH-PX), superoxide dismutase (SOD), and catalase (CAT) increases) in animals with TAA-induced liver damage followed by Ag-BSEPS. Moreover, the activities of the fibrotic markers transforming growth factor-beta 1(TGF-β1) and type III pro-collagen (PCIII) were increased in liver tissues in the group which was given TAA alone as compared to the controls. The percentage of fibrosis of hepatic tissue had a positive correlation with the levels of PCIII and TGF-β1, followed by Ag-BSEPS compared to the TAA group without nanocomposite treatment. Microscopic examinations revealed inhibitory effects of Ag-BSEPS on inflammatory changes and deterrent of liver fibrosis. Conclusion: It was suggested that the biochemical and histological amelioration observed in Ag-BSEPS (100 mg/kg-1 twice a week for 6 weeks) treated the fibrotic rats.

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Microwave-assisted preparation of zeolite K–H from alumatrane and silatrane

Cited by 15 publications

References 28 publications

Insights into the Microstructure of Hydrothermal Synthesized Nanoscale K2O-Al2O3-SiO2-H2O Particles

Insights into the Microstructure of Hydrothermal Synthesized Nanoscale K2O-Al2O3-SiO2-H2O Particles

Preparation of porous diatomite-templated carbons with large adsorption capacity and mesoporous zeolite K-H as a byproduct

Effect of nanopolysaccharide (BSEPS) from Bacillus subtilis sp. on thioacetamide-induced liver fibrosis in rats

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