Properties of amorphous silica produced from rice and oat processing waste

Земнухова, Л. А.; Егоров, А. Г.; Fedorishcheva, G. A.; Barinov, N. N.; Sokol'nitskaya, T. A.; Botsul, A. I.

doi:10.1134/s0020168506010067

Cited by 53 publications

(19 citation statements)

References 3 publications

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“…In particular, the processing steps are relatively simple since each plant species has a constant chemical composition, and the extracted silica from plant sources contains a narrow range of metal oxide impurities (Zemnukhova et al 2006). The twenty percent ash content of rice husk (Liou 2004) that was produced also in our study makes this by-product utilization increasingly attractive economically.…”

Section: Economical Advantagesmentioning

confidence: 86%

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

2014

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The synthesis of analcime and nanosized ZSM-5 zeolites was carried out by a hydrothermal method with silica extracted from rice husk, available as an inexpensive local biowaste, and without the use of an extra alumina source. Amorphous silica (with 88 wt% of SiO 2 ) was extracted from rice husk ash by a suitable alkali solution. The effects of crystallization temperature, time and SiO 2 / Al 2 O 3 ratio of the initial system on the properties of final products were investigated. For the characterization of the synthesized product, X-ray diffraction, scanning electron microscope, energy dispersive X-ray techniques, Fourier transform infrared and Brunauer-Emmett-Teller method were applied. Crystallinity percentages of analcime and nanosized ZSM-5 were 95.86 and 89.56, respectively, with specific surface area of 353.5 m 2 g -1 for ZSM-5. The experimental results revealed that the synthesis of analcime and nanosized ZSM-5 zeolites was more practical with using silica extracted from inexpensive raw materials, while the whole crystallization process was accomplished without adding any alumina source during.

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Section: Economical Advantagesmentioning

confidence: 86%

Synthesis of nanosized ZSM-5 zeolite using extracted silica from rice husk without adding any alumina source

2014

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“…The silica specimens were prepared by the schemes described earlier (Zemnukhova et al 2005(Zemnukhova et al , 2006: Scheme I-a weighed amount of the raw material was first ashed at 300°C for removal of volatile substances and then was exposed to thermolysis at 600°C; Scheme II-a weighed amount of the raw material treated with 0.1 N hydrochloric acid solution at 90°C for 1 h, filtered, washed with water, dried and then carbonized and annealed in a muffle furnace in air at 750°C to the constant mass; Scheme III-a weighed amount of the raw material was treated with 0.1 N sodium hydroxide solution at 90°C for 1 h; the residue was separated from the solution; the latter was then used for deposition of silicon dioxide with concentrated hydrochloric acid; the sediment was washed with water to complete removal of sodium chloride and dried at 60°C to the constant mass; Scheme IV-a weighed amount of the raw material was treated with 1 N potassium hydroxide solution at 90°C for 1 h; the residue was separated from the solution; the latter was then used for deposition of sodium alumosilicate with aluminium sulfate; the sediment was washed with water to complete removal of potassium sulfate and dried at 60°C to the constant mass.…”

Section: Methodsmentioning

confidence: 99%

“…All the samples were sieved and the fraction with 0.2 mm particles was selected for investigation. The substances prepared to research were identified by the chemical, IR spectroscopy (Shimadzu FT-IR Prestige-21 Fourier spectrophotometer, the frequency range 400-4,000 cm -1 , vaseline oil), X-ray (Bruker D8 ADVANCE diffractometer, CuK a -radiation0 and thermogravimetric (Q-1000 derivatograph) methods using standard techniques described earlier (Zemnukhova et al 2005(Zemnukhova et al , 2006. Specific surface values (S sp ) and pore distribution by their sizes were determined by nitrogen adsorption at ASAP 2020 analyzer (Micromeritics Instrument Corporation).…”

Section: Methodsmentioning

confidence: 99%

Biomass derived silica containing products for removal of microorganisms from water

Земнухова

Kharchenko

Беленева

2014

Int. J. Environ. Sci. Technol.

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The research is potentially attractive for converting silica rich biomass into useful materials. Silica containing specimens prepared by the thermal method and deposition from rice production waste (straw and husk) were evaluated for their ability to remove different strains of microorganisms from the water. The strains of microorganisms with different cell shape and size were chosen for investigation: Escherichia coli, Bacillus subtilis, Candida albicans, Pseudomonas aeruginosa, Staphylococcus aureus and freshwater heterotrophic bacterial association. The results obtained have been discussed as compared to the physical and chemical parameters of the sorbents: their composition, specific surface value, pore size, zeta potential value and surface hydrophobicity. Our study showed that removal efficiency of SiO 2 specimens and alumosilicate sample prepared from rice husk to different strains of microorganisms was higher that of other specimens including commercial sorbent. The use of various processing schemes for rice production waste let to obtain efficient selective sorbents.

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“…Rice husks are usually considered primarily as a source of cheap silica [107][108][109] and also of silicon-containing materials of the SiC [110,111], Si 3 N 4 [112,113], silane, and other types [114,115]. In addition, porous carbonized rice husks are used as catalyst supports [116][117][118].…”

Section: Production Of Activated Carbons From High-ash Biomassmentioning

confidence: 99%