Silica extraction from rice husk: Comprehensive review and applications

Nzereogu, P.U.; Omah, A.D.; Ezema, F.I.; Iwuoha, E.I.; Nwanya, A.C.

doi:10.1016/j.hybadv.2023.100111

Cited by 26 publications

(3 citation statements)

References 124 publications

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“…The process of calcination and leaching of rice husk ash was aimed at eliminating impurities, including metal oxides or organic materials, to improve the quality of silica (SiO 2 ) (Nzereogu et al, 2023) . Consistent with a previous study by Morales Paredes et al (2023) , the rice husk ash obtained was white due to the decrease in impurity concentration.…”

Section: Characteristics Of Synthesized Sba-15mentioning

confidence: 99%

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Synthesis of Zn/SBA-15 from Rice Husk Ash Using Sonochemical Methods as a Quercetin Drug Delivery Matrix

Azizah,

Haddiana,

Rudiana

2024

Sci. Technol. Indones

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Quercetin is a drug candidate with bioavailability but currently limited, necessitating the use of a delivery matrix, such as Santa Barbara Amorphous-15 (SBA-15). Rice husk ash, containing a significant amount of silica, served as a precursor in the synthesis of SBA-15, which can be functionalized with nanoparticles, including zinc, using sonochemical methods. Therefore, this study aimed to synthesize Zn/SBA-15 using sonochemistry and evaluate the potential as a drug delivery matrix for quercetin. SBA-15 was formed by sonication of a sodium silicate from rice husk and pore director Pluronic P-123, followed by impregnating Zn at 2%, 4%, and 6% w/w. The characterization of X-ray diffraction (XRD) and fluorescence (XRF) showed a broad peak at 2theta 18-30◦ with Zn levels of 1.89%, 3.69%, and 5.06%. Furthermore, the analysis of transmission electron microscopy (TEM) showed the presence of Zn nanoparticles with a range size of 4-14 nm. In vitro drug delivery experiments were carried out using Zn/SBA-15 at concentrations of 1:1 and 1:2 to quercetin. The in vitro test results for a drug loading of quercetin with Zn/SBA-15 6% 1:1 was 28.30 mg/g. The encapsulation efficiency was 10.96% and the drug release reached 33.64% after 240 minutes.

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Section: Characteristics Of Synthesized Sba-15mentioning

confidence: 99%

“…Agricultural waste, such as rice husks, is abundant in Indonesia and the potential has not been fully maximized. Nzereogu et al (2023) showed that thermal degradation processes yield rice husk ash with 85% to 95% silica content, providing sample opportunity for exploitation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Zn/SBA-15 from Rice Husk Ash Using Sonochemical Methods as a Quercetin Drug Delivery Matrix

Azizah,

Haddiana,

Rudiana

2024

Sci. Technol. Indones

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“…It has an ash content of 10–20%, of which 87–97% is silica. Currently, the demand to extract silica from rice husk through efficient and sustainable methods is increasing 20 .…”

Section: Introductionmentioning

confidence: 99%

Resin-based dental pulp capping restoration enclosing silica and portlandite nanoparticles from natural resources

Elbatanony,

Safwat,

El-Sherif

et al. 2024

Sci Rep

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Natural-based materials represent green choices for biomedical applications. In this study, resin pulp capping restoration enclosing strengthening silica and bioactive portlandite nanofillers were prepared from industrial wastes. Silica nanoparticles were isolated from rice husk by heat treatment, followed by dissolution/precipitation treatment. Portlandite nanoparticles were prepared by calcination of carbonated lime waste followed by ultrasonic treatment. Both were characterized using x-ray diffraction, energy dispersive x-ray, and transmission electron microscopy. For preparing pulp capping restoration, silica (after silanization) and/or portlandite nanoparticles were mixed with 40/60 weight ratio of bisphenol A-glycidyl methacrylate and triethylene glycol dimethacrylate. Groups A, B, and C enclosing 50 wt.% silica, 25 wt.% silica + 25 wt.% portlandite, and 50 wt.% portlandite, respectively, were prepared. All groups underwent microhardness, compressive strength, calcium release, pH, and apatite forming ability inspection in comparison to mineral trioxide aggregate (MTA) positive control. In comparison to MTA, all experimental groups showed significantly higher compressive strength, group B showed comparable microhardness, and group C showed significantly higher calcium release. Groups B and C showed prominent hydroxyapatite formation. Thus, the preparation of economic, silica-fortified, bioactive pulp capping material from under-utilized agricultural residues (rice husk) and zero-value industrial waste (carbonated lime from sugar industry) could be achieved.

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Nanosilica from canary seed husk for corrosion protection of structural steel

León‐Silva,

Nicho,

Cajero‐Sotelo

et al. 2024

Vietnam Journal of Chemistry

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An alternative technique is presented for the corrosion protection of the A36 structural steel (A36SS) in acid medium (H2SO4) using silica obtained from canary seed husk (CSH). The silica was obtained in a solid amorphous state with a particle size of 10–22 nm. The anticorrosive properties of nanosilica (NS) were studied using potentiodynamic polarization (PDP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS). Before carrying out the corrosion tests, the A36SS was subjected to a treatment with NaOH solution without and with the presence of NS. The A36SS treated with NS presented the lowest current density values and the noblest corrosion potential values, indicating that the corrosion rate decreased. The surface morphological study of the tested systems using SEM/EDS showed that the NS‐treated A36SS had a more efficient physical barrier against corrosive species.

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Silica extraction from rice husk: Comprehensive review and applications

Cited by 26 publications

References 124 publications

Synthesis of Zn/SBA-15 from Rice Husk Ash Using Sonochemical Methods as a Quercetin Drug Delivery Matrix

Synthesis of Zn/SBA-15 from Rice Husk Ash Using Sonochemical Methods as a Quercetin Drug Delivery Matrix

Resin-based dental pulp capping restoration enclosing silica and portlandite nanoparticles from natural resources

Nanosilica from canary seed husk for corrosion protection of structural steel

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