Silica Content and Structure from Corncob Ash with Various Acid Treatment  (HCl, HBr, and Citric Acid)

Wardhani, Gladys Ayu Paramita Kusumah; Nurlela, Nurlela; Azizah, Mia

doi:10.20884/1.jm.2017.12.2.382

Cited by 27 publications

(19 citation statements)

References 14 publications

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“…It can be observed from the Figure that all silica samples and RHA consisted of similar functional groups with characteristics bands located at 455.12‐472.91 cm −1 , 789.96‐798.53 cm −1 , 1064.51‐1094.85 cm −1 , 1631.51‐1645.62 cm −1 , and 3440.39‐3472.72 cm −1 . Similar absorption bands were also found by Wardhani et al who extracted silica from corncob ash. The authors stated that the bands at 459‐469 cm −1 , 616‐797 cm −1 , and 1037‐1106 cm −1 depicted siloxane (≡Si‐O‐Si≡) group, whereas 1636‐1641 cm −1 and 3445‐3476 cm −1 denoted silanol (≡Si–O–H).…”

Section: Resultssupporting

confidence: 86%

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Nayak

Nandi

Datta

2019

Engineering Reports

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In the present study, an attempt has been made to extract commercial grade amorphous silica nanoparticles from rice husk (RH) using four different chemicals (NaOH, KOH, Na2CO3, and K2CO3) and two washing solvents (water and ethanol). The elemental, structural, and morphological characterizations of the silica samples were carried out using scanning electron microscopy coupled with energy‐dispersive X‐ray spectroscopy (SEM‐EDS), atomic absorption spectrometry (AAS), X‐ray diffraction (XRD), and Fourier‐transform infrared spectroscopy (FTIR). The combined NaOH and water treatment was found to be the most efficient method in terms of recovery of silica sample, while combined Na2CO3 and water treatment was more suitable for obtaining pure silica. No significant difference in the percentage recovery of silica was observed between the two washing treatments at p < 0.05. Scanning electron micrographs of the Na2CO3‐cum‐water and K2CO3‐cum‐water treated samples showed nonagglomerated silica nanoparticles. The XRD analysis of silica obtained from these two treatments was also free from any sharp peaks illustrating pure amorphous structure of silica. EDS and AAS study of K2CO3‐cum‐water treated samples showed higher mineral impurities compared to Na2CO3‐cum‐water treated sample. It could be inferred that silica obtained from Na2CO3 and water washing treatment can be used for extraction of metallurgical grade silicon.

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Section: Resultssupporting

confidence: 86%

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Nayak

Nandi

Datta

2019

Engineering Reports

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“…The very low C=C/C=O intensity ratio demonstrates a nearly complete radical polymerisation, even better than Zr 4 MMA/MMA, despite the steric hindrance of the oxocluster. Concerning the hybrid with MAPTMS ( Figure S1 and Figure 2 c), it is possible to observe a very broad band around 3460 cm −1 , ascribed to the vibration of surface bound water molecules and to the silanol groups (which also give the band at 1640 cm −1 ) [ 29 ], thus highlighting a not completely condensed silica network [ 30 , 31 ]. The relatively weak absorption bands around 2945 cm −1 and 2840 cm −1 are attributed to the stretching of C–H bonds in alkyl and methoxy groups, respectively.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Activity of a Hybrid Polymer–Oxocluster Catalyst: A Composition—Selectivity Correlation

et al. 2021

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Zr-based oxoclusters MxOy(OR)w(OOR’)z are promising catalysts for the activation of hydrogen peroxide. However, they need to be integrated into suitable matrices to increase their hydrolytic stability and allow for their recovery after use. Polymeric materials can be successfully employed for this aim, since they modify the properties of the resulting hybrid materials, in terms of polarity and chemical affinity for the substrates, improving the catalytic activity. Herein, we report the synthesis of different acrylic polymers based on various co-monomers (methyl methacrylate (MMA), 2,2,2-trifluoroethylmethacrylate (TFMA) and 3-methacryloxypropyltrimethoxylsilane (MAPTMS)) covalently cross-linked by a Zr4-based oxocluster, whose composition was tuned to optimise the catalytic oxidation of methyl p-tolyl sulphide. To assess their properties and stability, the materials were characterised via Fourier Transform Infrared (FT-IR) and Raman spectroscopies, Thermogravimetric Analysis (TGA), Solid-State NMR (SS-NMR) and X-Ray Absorption Spectroscopies XAS, before and after catalytic turnover.

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“…respectively. As whiteness of the ash samples is associated to the amount of pure noncombustible silica (Wardhani et al, 2017), EFB has therefore shown to contain the purest silica when calcined at 800°C compared to PKS and DC. Besides, amongst all waste samples, EFB400 records the lowest whiteness value of 0.31, which depicts that it contains relatively higher amount of nonsilica materials.…”

Section: Color Analysismentioning

confidence: 99%

Characteristics of calcined palm oil pastes for biosilica extraction as a function of calcination temperatures

Samat¹,

Jaman²,

Saree³

et al. 2021

JART

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Palm oil production in Malaysia has increased over the years. As the consequence of high production of palm oil, surplus quantities of palm oil biomass wastes such as empty fruit bunches (EFB), palm kernel shell (PKS), and oil palm decanter cake (DC) are generated. Generally, these wastes are used as fuel to generate steam for boilers, which end up as ash. As several agricultural wastes are well-known to be rich in silica content, this study aims to investigate the bio-silica content of EFB, PKS and DC and their characteristics when calcined at various calcination temperatures from 400°C to 800°C. Several analyses were conducted such as weight loss, color, BET, SEM and FTIR. The results have shown that all samples favorably exhibited silica at higher temperatures, i.e., 800°C. Color analysis depicted that combustible elements were mostly removed at 800°C, leaving non-combusted silica in the waste ash. Weight loss analysis presented that EFB achieved the highest weight loss at 99.05%, followed by PKS at 95.65% and DC at 83.95%. This led to a relatively high amount or purity of silica in the sample. BET analysis showed highest surface area, 20.087m2/g (PKS) and the lowest is 9.492m2/g (DC) at 800°C which verified the high porosity of samples for further absorption applications. The presence of silica was also significantly observed in 800°C FTIR spectra for all waste samples. Overall, it is concluded that EFB, PKS, and DC are highly potential wastes to contribute to the production of bio-silica, which thus can be an option to overcome waste disposal issues in palm oil industries.

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Silica Content and Structure from Corncob Ash with Various Acid Treatment (HCl, HBr, and Citric Acid)

Cited by 27 publications

References 14 publications

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Tuning the Activity of a Hybrid Polymer–Oxocluster Catalyst: A Composition—Selectivity Correlation

Characteristics of calcined palm oil pastes for biosilica extraction as a function of calcination temperatures

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