Determination of Silica Activity Index and XRD, SEM and EDS Studies of Amorphous SiO2 Extracted from Rice Husk Ash

Deshmukh, Pallavi; Bhatt, Jatin; Peshwe, D. R.; Pathak, S. U.

doi:10.1007/s12666-011-0071-z

Cited by 106 publications

(48 citation statements)

References 10 publications

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“…Comparing WAXD spectra of POMA and SiO 2 in literature, it can be seen that the diffraction pattern of the POMA/SiO 2 nanocomposite is the same as POMA and silica. It does not belong to a specific crystallographic plane, and what actually may be deduced, there is a broad peak due to an amorphous material.…”

Section: Resultsmentioning

confidence: 89%

A facile preparation method for synthesis of silica sulfuric acid/poly(o‐methoxyaniline) core–shell nanocomposite

Modarresi‐Alam¹,

Zafari

Miandashti

2015

Polymers for Advanced Techs

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A new nanocomposite of poly(o-methoxyaniline) (POMA) is introduced by overlayer formation of POMA on silica.The key appealing feature of the synthesis is the role of silica sulfuric acid (SSA) both as solid acid dopant and template in overlayer self-assembly of POMA on silica surface. Hereon siloxide group (Si-O À ) of silica surface is replaced with dopant anion of SSA (≡Si-O-SO 3 À ), which leads to formation of a overlayer of POMA on the silica surface. The composite particles are spherical in the nanoscale range of 50 nm without application of any external template (notemplate synthesis). Nanocomposite was fully characterized by various instrumentation methods: Fourier transform infrared (FT-IR), ultraviolet-visible (UV-vis), thermogravimetric analysis (TGA), diffrential thermal analysis (DTA), elemental analysis (CHNS), energy dispersive X-ray (EDX), X-ray photoelectron spectroscopy (XPS) and X-ray difraction (XRD). Based on XPS and CHNS results, it is demonstrated that the doping level of POMA is as high as 50% and for the first time the ratio of 4:2:2 is obtained for -NH-(amine): -HN .+ -(polarons): ¼HN + -(bipolarons), respectively. In fact, bipolarons may also coexist with polarons with a 1:1 ratio of them. Moreover, the synthesis benefits from the perspective of green chemistry which is preparation under solid-state (solvent-free) condition.

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Section: Resultsmentioning

confidence: 89%

A facile preparation method for synthesis of silica sulfuric acid/poly(o‐methoxyaniline) core–shell nanocomposite

Modarresi‐Alam¹,

Zafari

Miandashti

2015

Polymers for Advanced Techs

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“…Generally, it can be said that the higher the percentage of solubility is (more than 50%), the better quality the silica is. Solubility is also expressed by the Silica Activity Index [17]. Many studies have been conducted on how to produce better ash, including how to burn rice husks [18][19][20][21].…”

Section: Rice Plants and Silicamentioning

confidence: 99%

Study of the feasibility of a rice husk recycling scheme in Japan to produce silica fertilizer for rice plants

Sekifuji

Tateda

2019

Sustain Environ Res

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Rice husks are resources that should be recycled in a sustainable way, thus creating a win-win relationship between stakeholders, consumers, and society. Silica is a very valuable material and used for many industrial purposes. A Rice husk contains 20% of silica by weight, and can therefore be considered a biological silica ore. To recycle rice husks in a sustainable way, the ash produced from burning rice husks must also be used as a resource. In this study, based on the concept that rice husk ash should be recycled as silica fertilizer, we compared the economic feasibility of two recycling systems: Heat recovery from hot water and generation of electricity from hot water. Questionnaires were also conducted regarding farmers' expectations of silica fertilizer made from rice husk ash. We found that the system involving heat recovery from hot water was sustainable; however, generating electricity from hot water was cost-prohibitive. It must be noted that the validity of this result might be limited to Japan, where electricity generation is highly regulated. On the other hand, areas that already struggle to dispose of their rice husks should consider using rice husks to produce energy.

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“…The structure of the different samples was investigated using SEM ( Figure 11). No treated sample (Figure 11(a) and 11(b)) presented an external epidermal cell with prominent domes with a high content of silica that provides strength and stiffness to the husk and a smooth internal cell with a minor content of silica [29,31,33].…”

Section: Semmentioning

confidence: 99%

“…It can be observed silica particles with a broad size distribution (between 30 to 200 μm) as were expected, confirming the result of the FTIR test ( Figure 5). A heating above the temperature at which it was burned would caused a formation of cristobalite and trydimite [33].…”

Section: Semmentioning

confidence: 99%

Revalorization of rice husk waste as a source of cellulose and silica

et al. 2015

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Cellulose and silica were obtained from rice husk by a multi-step procedure. Three different strategies including different alkaline and bleaching steps were evaluated by Fourier transform infrared spectroscopy (FTIR) in order to choose the sequence that combines the better conditions to obtain both subproducts simultaneously. The effects of the different steps on the structure and morphology of original material treated by the selected procedure were analyzed by X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The results suggest that it is possible to obtain both by-products with a simple procedure, giving an added value to this waste. Experimental MaterialsRH was obtained as a residue of rice industries of Entre Ríos (Argentina). Rice husk was extensively washed with distilled water to remove dust and other impurities. This operation was carried out several times at room temperature under vigorous stirring. After successive washings, rice husk was dried in an air-circulated oven at 80±1 o C and then crushed for 10 min using a ball mill (Pulverisette 7, Fritsh, Alemania). The final moisture content of the material was

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Determination of Silica Activity Index and XRD, SEM and EDS Studies of Amorphous SiO2 Extracted from Rice Husk Ash

Cited by 106 publications

References 10 publications

A facile preparation method for synthesis of silica sulfuric acid/poly(o‐methoxyaniline) core–shell nanocomposite

A facile preparation method for synthesis of silica sulfuric acid/poly(o‐methoxyaniline) core–shell nanocomposite

Study of the feasibility of a rice husk recycling scheme in Japan to produce silica fertilizer for rice plants

Revalorization of rice husk waste as a source of cellulose and silica

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