Porous silica and carbon derived materials from rice husk pyrolysis char

Shen, Yafei; Zhao, Peitao; Shao, Qinfu

doi:10.1016/j.micromeso.2014.01.005

Cited by 235 publications

(122 citation statements)

References 420 publications

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“…The content of SiO2 in the ash of the RHC was 94.36%. Behainne and Martinez (2014) and Shen (2014a) reported that the SiO2 was mainly present on the outside and internal surface of the RH (Fig. 7a, 7b, and 7c).…”

Section: The Properties Of Rice Husk Char (Rhc)mentioning

confidence: 92%

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Gasification of Rice Husk in a Downdraft Gasifier: The Effect of Equivalence Ratio on the Gasification Performance, Properties, and Utilization Analysis of Byproducts of Char and Tar

Zhao

et al. 2015

BioResources

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Rice husks (RH) are a potential biomass source for bio-energy production in China, such as bio-gas production by gasification technology. In this paper, a bench-scale downdraft fixed bed gasifier (DFBG) and a tar sampling system were designed. The effect of equivalence ratio (ER) on gasification performance in terms of the temperature in the gasifier, the composition distribution of the producer gas, and the tar content in the producer gas was studied. The maximum lower heating value of 4.44 MJ/Nm 3 , minimum tar content of 1.34 g/Nm 3 , and maximum cold gas efficiency of 50.85% were obtained at ER of 0.211. In addition, the characteristics of gasification byproducts, namely bio-char and bio-tar, were analyzed. The proximate and ultimate analysis (especially of the alkali metal), the surface morphology, the surface area, and the pore size distribution of the rice husk char (RHC) were obtained by the use of X-ray fluorescence (XRF) and scanning electron microscopy (SEM), as well as by using the Brunauer-Emmett-Teller (BET) method. The components of light tar and heavy tar were obtained by using gas chromatography-mass spectrometry (GC-MS).

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Section: The Properties Of Rice Husk Char (Rhc)mentioning

confidence: 92%

“…7a, 7b, and 7c). Thus, the RHC was an excellent source of high purity amorphous silica, which could be used in several applications, such as for silica gel and glass (Shen et al 2014a). As shown in Figs.…”

Section: The Properties Of Rice Husk Char (Rhc)mentioning

confidence: 99%

Gasification of Rice Husk in a Downdraft Gasifier: The Effect of Equivalence Ratio on the Gasification Performance, Properties, and Utilization Analysis of Byproducts of Char and Tar

Zhao

et al. 2015

BioResources

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“…From the reflection refinement, amorphous silica is exist in RHA as shown by the reflection at around 22.5 o while after the composite formation, TiO2-SiO2, the crystalline form was obtained [11,12]. From the specific reflection, it is concluded that both anatase and rutile phase of TiO2 are produced in the synthesis.…”

Section: Resultsmentioning

confidence: 92%

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

Fatimah

Said

Hasanah

2014

Bull. Chem. React. Eng. Catal.

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Preparation, characterization and utilization of TiO2-SiO2 as photocatalyst for methyl violet (MV) decolorization has been conducted. In this research, preparation of TiO2-SiO2 was developed based on natural renewable silica source; rice husk ash (RHA) via a sol-gel technique. The composite was formed by the dispersing of titanium isopropoxide as titania precursor into the gel of silica followed by aging, drying and calcination. The TiO2-SiO2 sample was characterized by powder X-ray diffraction (XRD), diffuse reflectance-UV Visible spectrophotometric analysis (DRUV-Vis), gas sorption analyzer and Scanning electron micrograph (SEM) before its utilization as photocatalyst in methyl violet photooxidation. As comparison to the physicochemical character study, the synthesis of TiO2-SiO2 by using tetraethyl ortosilicate (TEOS) was performed as a confirmation. Result showed that prepared TiO2-SiO2 has the character similar to TiO2-SiO2 as synthesized by TEOS precursor. The formation of crystalline titania in anatase and rutile phase was identified with increasing surface porosity data and the value of band gap energy which sufficiently contribute to a photocatalytic mechanism. The character data are in line with the kinetic data of methyl violet decolorization. From the compared photooxidation, photolysis, photocatalysis and adsorption process, it can be concluded that TiO2-SiO2 acts efficiently as a photocatalyst.

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“…Among plants containing a large percentage of silica we find rice husk. It contains between 13 and 29% of the total weight in cellulose and about 24.7% in silica [22][23][24]. To obtain SiO 2 -rice it is necessary to remove all organic matter (cellulose) through prolonged calcinations.…”

Section: Obtained Silica From Rice Huskmentioning

confidence: 99%

“…Rice -Technology and Productionthe removal of the organic material through calcinations at low temperatures (650°C) [22][23][24], with the concomitant benefit of avoiding the sintering of silica. Figure 5 shows the sintering process, which involves the removal of hydroxyl groups distributed on the surface through condensation, causing the collapse of the pores in the material [25].…”

Section: Obtained Silica From Rice Huskmentioning

confidence: 99%

Silica from Rice as New Drug Delivery Systems

Salazar-Hernández¹,

Salazar-Hernández²,

Rocío³

et al. 2017

Rice - Technology and Production

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The pharmaceutical industry has seen an increased need of carriers or excipients design that allows the controlled release of a drug in the human body. The main role of an excipient is to carry the drug for its administration under therapeutic index. Among the new generation of excipients, the ordered mesoporous silica (MS) presents several advantages, such as excellent biocompatibility, good adsorption capacity, and precise control in the drug delivery. However, the high cost of synthesis of mesoporous silica restricts its use to industrial applications; therefore, a low-cost procedure is necessary for widespread use. Biogenic silica from rice husk (SiO 2 -rice) could be a new choice as a drug delivery system. This silica is obtained from an acid leaching of rice husk followed by calcinations processes at low temperatures; these conditions produce silica with good adsorption properties, similar to those of MS. In consequence, the excipient behavior of SiO 2 -rice was assessed using folic acid as the model drug, displaying an 18.5% of absorption in the SiO 2 -rice pores, while MS absorbed around 19%. The drug release profiles were similar for both the silicas, suggesting that SiO 2 -rice could be a low-cost, similar yield excipient for drugs similar to folic acid.

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Porous silica and carbon derived materials from rice husk pyrolysis char

Cited by 235 publications

References 420 publications

Gasification of Rice Husk in a Downdraft Gasifier: The Effect of Equivalence Ratio on the Gasification Performance, Properties, and Utilization Analysis of Byproducts of Char and Tar

Gasification of Rice Husk in a Downdraft Gasifier: The Effect of Equivalence Ratio on the Gasification Performance, Properties, and Utilization Analysis of Byproducts of Char and Tar

Preparation of TiO2-SiO2 using Rice Husk Ash as Silica Source and The Kinetics Study as Photocatalyst in Methyl Violet Decolorization

Silica from Rice as New Drug Delivery Systems

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