Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash

Liou, Tzong-Horng; Yang, Chun‐Chen

doi:10.1016/j.mseb.2011.01.007

Cited by 262 publications

(114 citation statements)

References 39 publications

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“…Several researches [22][23][24] reported that pure silica can be extracted with the purity in the range of 94-98% exists as amorphous and reactive. Many attempts have been made to utilize rice husk silica to produce various silica based materials, such as production of nanosilica [25][26] , zeolites 27 , silica aerogel 28 . In our previous investigations, several ceramic materials derived from rice husk silica reported in literatures are borosilicate 29 , carbosil 30 , aluminosilicate 31 , mullite [32][33] and cordierite [34][35] .…”

Section: Introductionmentioning

confidence: 99%

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Sembiring¹,

Riyanto²,

Simanjuntak³

et al. 2017

Orient. J. Chem

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This study acquires the potential of rice husk silica for production forsterite precursors using sol-gel method. The samples preparation were conducted by mixing magnesium oxide sol from Mg(NO 3 ) 2 .6.12H 2 O with silica sol extracted from rice husk, with three different composition ratios of MgO to SiO 2 are 1:1, 2:3 and 3:2 by weight and sintered at 900 o C. The samples were characterized using Fourier transform infrared (FTIR) spectroscopy, x-ray diffraction (XRD),differential thermal analysis (DTA), followed by scanning electron microscopy (SEM). The FTIR results showed the presence of Si-O-Si, Mg-O and Mg-O-Si functional groups, which were associated with forsterite, enstatite, cristobalite and periclase, according to the XRD analysis. The formation of forsterite (Mg 2 SiO 4 ) is composition-dependent as revealed the increase of forsterite intensity after sintered at 900 o C in ratio 3:2. The surface morphology of non-sintered samples shows that particle and grain size were larger than particle and grain size of sintered samples. Also, SEM analysis of sintered samples clearly shows the presence of regular particle size with smaller grain size was found in ratio of MgO to SiO 2 is 3:2. DTA analysis revealed that the formation of forsterite increased with increasing temperature. In addition, the electrical resistivities of the samples were found in the range of 0.75 x 10 13 to 3.30 x 10 13 Ω-cm, demonstrating that the samples exhibit good potential as isolator.

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Section: Introductionmentioning

confidence: 99%

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Sembiring¹,

Riyanto²,

Simanjuntak³

et al. 2017

Orient. J. Chem

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“…6) showed that the ash content disappeared after activation, which indicates that NaOH reacted with silica to synthesize sodium silicate (Na2SiO3). Na2SiO3 is soluble in water and can be removed by an adequate water-washing procedure (Liou and Yang 2011). The overall reaction for Na2SiO3 formation is as follows: The silica in the interior tissue of rice straw disappeared through Eq.…”

Section: Analysis Of Thermal Characteristics and Reaction Pathsmentioning

confidence: 99%

An Effective Method to Enhance Adsorption Capacity and Mesoporosity of Activated Carbon by Pre-Pyrolysis and Chemical Activation Procedures

Liou¹,

Wang²,

Liou³

2016

BioResources

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Activated carbons with large adsorption capacity and high mesopore fraction were obtained from rice straw by a combination of pre-pyrolysis and NaOH activation procedures. The experiments varied the prepyrolysis procedure, impregnation ratio of activating agent, and activation temperature. Samples were examined by inductively coupled plasmamass spectrometry (ICP-MS), X-ray diffractometry (XRD), field-emission scanning-electronic microscopy (FE-SEM), thermogravimetric analysis (TGA), and N2-adsorption analysis. The surface area and pore characteristics of the activated carbons were investigated by the Brunauer, Emmett, Teller (BET) method, Dubinin-Raduch (DR) model, and the t-plot method. The surface area, pore volume, and iodine adsorption capacity of the samples increased with increasing activation temperature and the impregnation ratio of the activating agent. A maximum surface area of 2093 m 2 /g was obtained at the activation temperature of 900 °C. The pore structure in the one-stage activation procedure was mainly microporous. Two-stage activation procedure efficiently enhanced mesopore volume, and therefore further increased the adsorption capacity of activated carbons. NaOH acted as both the activating agent in the reaction and as the cleaner to remove the ash. The results of this experiment will be useful in developing resource recovery systems from agricultural biomass.

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“…In Brazil, the ample supply of carbonized rice husk, especially in producing regions, is subsidizing its use as a component of forest substrates. It is a rather bulky component; only a small portion of it is used as fuel, resulting in an imbalance between its supply and demand, by increasing its world production (Liou and Yang 2011).…”

Section: Introductionmentioning

confidence: 99%

Ranking of substrates based on Piptadenia gonoacantha morphological parameters

Kratz

Wendling²,

Stuepp

et al. 2016

Bosque (Valdivia)

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SUMMARYThe definition of best substrates is often difficult due to variability of results observed in different measured variables. Therefore, we defined the best substrates for Piptadenia gonoacantha seedlings production through ranking, taking into account the relative importance of each variable in seedlings quality. In this regard, 13 substrates were formulated, composed of carbonized rice husk in different grain size, coconut fiber and two commercial substrates, pine bark and vermiculite base, all of which had their physical and chemical properties evaluated. Direct seeding was held in containers of 115 cm³, remaining for 90 days in a greenhouse and 30 days in a hardening area with full sunlight. After 120 days, an assessment of height, stem diameter, shoot dry mass, root dry mass, ease of container removal, and aggregation of roots to substrate was performed. As a result, we found higher seedling growth in substrates composed of pure components, which were based on different rice husk grain size. Addition of coconut fiber provided seedlings with lower quality. Pine bark-based commercial substrates occupied the sixth and 12 th positions in substrates ranking classification.Key words: pau-jacaré, seedling production, forest seedlings quality, agricultural residues, silviculture. RESUMENLa definición del mejor sustrato es a menudo difícil debido a la variabilidad de los resultados observados en las diferentes variables medidas. Basado en esto, el objetivo fue definir los mejores sustratos para la producción de plántulas de Piptadenia gonoacantha por medio de la clasificación, teniendo en cuenta la importancia relativa de cada variable en la calidad de las plantas. Para este fin, se formularon 13 sustratos a base de cáscara de arroz carbonizado en diferentes tamaños de grano, fibra de coco y corteza de pino compostada, que tenían sus propiedades físicas y químicas evaluadas. Se realizó siembra directa en tubos de 115 cm³, permaneciendo durante 90 días en invernadero de vidrio y 30 días en zona de rustificación a pleno sol. Después de 120 días, se evaluaron la altura, el diámetro del tallo, la biomasa seca aérea, la biomasa seca de las raíces, la facilidad de extracción desde el contenedor y la agregación de las raíces en el sustrato. Como resultado, hay un mayor crecimiento de las plántulas en sustratos compuestos por componentes puros a base de diferentes tamaños de grano de cáscara de arroz. La adición de fibra de coco proporcionó una producción de plántulas con calidad inferior. Los sustratos comerciales basados en corteza de pino ocuparon la posición de sexto y duodécimo en la clasificación de los sustratos.Palabras clave: pau-jacaré, producción de plántulas, calidad de plántulas forestales, residuos agrícolas, silvicultura.

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Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash

Cited by 262 publications

References 39 publications

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

Effect of MgO-SiO2 Ratio on the Forsterite (Mg2SiO4) Precursors Characteristics Derived from Amorphous Rice Husk Silica

An Effective Method to Enhance Adsorption Capacity and Mesoporosity of Activated Carbon by Pre-Pyrolysis and Chemical Activation Procedures

Ranking of substrates based on Piptadenia gonoacantha morphological parameters

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