Uso das cinzas de casca de arroz para obtenção de sílica pelo processo sol-gel

Fuzinatto, Mirian D.; Irigon, Paula Irigon de; Filho, Pedro José Sanches

doi:10.36229/978-65-5866-050-7.cap.11

Cited by 2 publications

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“…For comparison with the ultrasound aided sol-gel method, a reference method (traditional method) was adopted in this study, which is based on the sol-gel method performed by Kalapathy et.al. (2001) and later adapted by Fuzinatto et al (2021). Typically, 5 g of sample was mixed with 100 ml of 1M NaOH for 1 hour at 90 °C with constant magnetic stirring.…”

Section: Traditional Methodsmentioning

confidence: 99%

“…The Erlenmeyer was placed in the ultrasound for a set amount of time, according to statistical planning. The molar ratio (n = nNaOH / nSilica) was determined based on the ash content of the average RHAC 1 sample, considering that 100% of the ash is SiO 2 , to ensure that NaOH was in excess, according to the preliminary study (Fuzinatto, M.D., Sanches Filho, P.J., Irigon, 2021). The temperature used was 60 °C (maximum temperature of the equipment).…”

Section: Ultrasound Methods % = (Sio2/(t C Xmrh a )) * 100mentioning

confidence: 99%

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Silica extraction from rice hull ash through the sol–gel process under ultrasound

Fusinato

Amaral

Irigon

et al. 2022

Environ Sci Pollut Res

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Rice is among the main foods produced in the world and is part of the daily diet of most families. The main waste from rice processing is rice husk (RH), which has been used as biomass for energy generation through combustion. In this process, rice husk ash (RHA) is generated as a residue, and its silica (SiO 2 ) content varies from 85-98%. The present work describes the study of the extraction of silica from RHA by the ultrasoundassisted sol-gel method. An experimental design based on the Response Surface Methodology (RSM) with the symmetrical, second-order Rotational Central Composite Design (RCCD) was applied to determine the best extraction conditions considering extraction time and molar ratio (n) as variables = n NaOH / n Silica ). These optimal conditions were then applied to three ash samples, two obtained by the combustion process in a boiler furnace, with a mobile grate system (RHAC 1 and RHAC 2 ), and one obtained by the pyrolysis process (RHAP) carried out in a xed bed reactor. Results showed that a molar ratio of 4.4, and an extraction time of 107 minutes were the best extraction conditions, leading to a yield of 73.3% for RHAP, 43.9% for RHAC 1 , and 31.1% for RHAC 2 . It was found that the extraction yield and textural properties of the silica obtained depend on the characteristics of the ash used. The silica extracted from RHAC 1 presented a surface area of 465 m 2 .g − 1 , mesopores of 4.69 nm, purity greater than 95%, and an ultra-ne granulometric distribution, reaching nanoparticle dimensions, characteristics comparable to commercially available silicas.

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Section: Traditional Methodsmentioning

confidence: 99%

Section: Ultrasound Methods % = (Sio2/(t C Xmrh a )) * 100mentioning

confidence: 99%

Silica extraction from rice hull ash through the sol–gel process under ultrasound

Fusinato

Amaral

Irigon

et al. 2022

Environ Sci Pollut Res

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Silica Extraction From Rice Hull Ash Through the Sol-gel Process Under Ultrasound

Fusinato

Amaral

Irigon

et al. 2022

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Rice is among the main foods produced in the world and is part of the daily diet of most families. The main waste from rice processing is rice husk (RH), which has been used as biomass for energy generation through combustion. In this process, rice husk ash (RHA) is generated as a residue, and its silica (SiO2) content varies from 85–98%. The present work describes the study of the extraction of silica from RHA by the ultrasound-assisted sol-gel method. An experimental design based on the Response Surface Methodology (RSM) with the symmetrical, second-order Rotational Central Composite Design (RCCD) was applied to determine the best extraction conditions considering extraction time and molar ratio (n) as variables = nNaOH / nSilica). These optimal conditions were then applied to three ash samples, two obtained by the combustion process in a boiler furnace, with a mobile grate system (RHAC1 and RHAC2), and one obtained by the pyrolysis process (RHAP) carried out in a fixed bed reactor. Results showed that a molar ratio of 4.4, and an extraction time of 107 minutes were the best extraction conditions, leading to a yield of 73.3% for RHAP, 43.9% for RHAC1, and 31.1% for RHAC2. It was found that the extraction yield and textural properties of the silica obtained depend on the characteristics of the ash used. The silica extracted from RHAC1 presented a surface area of 465 m2.g− 1, mesopores of 4.69 nm, purity greater than 95%, and an ultra-fine granulometric distribution, reaching nanoparticle dimensions, characteristics comparable to commercially available silicas.

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Uso das cinzas de casca de arroz para obtenção de sílica pelo processo sol-gel

Abstract: (CIP) M514 Meio Ambiente em Foco-Volume 13/ SUMÁRIO Capítulo 1: O papel das unidades de conservação na educação ambiental por meio do uso público ..

Cited by 2 publications

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Silica extraction from rice hull ash through the sol–gel process under ultrasound

Silica extraction from rice hull ash through the sol–gel process under ultrasound

Silica Extraction From Rice Hull Ash Through the Sol-gel Process Under Ultrasound

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