Characterization of Biogenic Silica Generated by Thermo Chemical Treatment of Rice Husk

Alyosef, Hallah Ahmad; Eilert, André; Welscher, Julia; Ibrahim, Suzan S.; Denecke, R.; Schwieger, Wilhelm; Enke, Dirk

doi:10.1080/02726351.2013.782931

Cited by 48 publications

(70 citation statements)

References 17 publications

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“…The ash content of RH and RS is one order of magnitude higher than the ash content of clean wood. Silicon is by far the most abundant element among the inorganic matter both in RH and RS [58,59,72,[98][99][100][101]. Ca, Mg, K, Na, P, S, Cl, and Al are also included but to a far lesser extent [59,73,98,99,[102][103][104][105].…”

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

“…Silicon is by far the most abundant element among the inorganic matter both in RH and RS [58,59,72,[98][99][100][101]. Ca, Mg, K, Na, P, S, Cl, and Al are also included but to a far lesser extent [59,73,98,99,[102][103][104][105]. Association of these ash forming elements as well as their distribution in the biomasses have a major impact on ash melting behavior [106] and consequently determine the remaining silica purity and quality [105,[107][108][109].…”

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

“…Fuel properties of RH, RS, and wood (data were taken from [23,59,99,102, for RH, from [105,109,112,[119][120][121]125,135,136,145,[156][157][158][159][160][161][162][163][164][165][166][167][168][169][170][171][172][173][174][175] for RS and from [92,110,[176][177][178] Origin of the raw materials can have a significant impact on the inorganic composition of fuel ashes of RH and RS. For instance, as shown in Table 2, RH from Egypt, Cambodia, and Italy was evaluated in the same laboratory with the same measurement techniques [72,98]. Results highlight that Si, K and P contents of the fuel ash can vary significantly.…”

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

“…Usually, a multi-step decomposition of RH and RS has been applied in lab-scale studies to obtain high purity biogenic silica with high SSA and low carbon [72,98,193]. For the decomposition of the individual macromolecules cellulose, hemicellulose, and lignin, as described in Section 2, different temperatures are used [72,98,100,193,194]. This strategy guarantees amorphous structure of the resulting silica since the maximum temperature never exceeds crystallization temperature [72].…”

Section: Combustion Of Rice Husk and Rice Strawmentioning

confidence: 99%

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Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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Utilization of biomass either as a renewable energy source or for the generation of biogenic materials has received considerable interest during the past years. In the case of rice husk (RH) and rice straw (RS) with high silica contents in the fuel ash, these approaches can be combined to produce high-grade biogenic silica with purities >98 wt % from combustion residues. The overall process can be considered nearly neutral in terms of CO2 emission and global warming, but it can also address disposal challenges of rice husk and rice straw. For the resulting biogenic silica, several advanced application opportunities exist, e.g., as adsorbents, catalysts, drug delivery systems, etc. This article provides a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica. Purity of up to 97.2 wt % SiO2 can be reached by combustion of untreated material. With appropriate fuel pre-treatment and ash post-treatment, biogenic silica with purity up to 99.7 wt % can be achieved. Studies were performed almost exclusively at a laboratory scale.

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Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

Section: Fuel Properties Of Rice Husk and Rice Strawmentioning

confidence: 99%

Section: Combustion Of Rice Husk and Rice Strawmentioning

confidence: 99%

See 2 more Smart Citations

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

et al. 2019

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“…The organic material consists of cellulose and lignin which can be turned to carbon dioxide (CO2) and carbon monoxide (CO). After acid leaching and calcination processes, the products are high in silica content and significant reduction of the other metal oxides and chlorine, which are regarded as impurities [12].Chlorine was almost completely remove from both the samples while the other impurities were significantly reduced .The organic material in biomass are hydrolyzed by the citric acid [13]. An XRD analysis was used to identify the two different phases of the product silica.…”

Section: Ax-ray Fluorescence Analysismentioning

confidence: 99%

Preparation of Silica from Agricultural Leaves waste by Organic Acid Leaching Treatment

Aung¹,

Aung²,

Nwe³

2018

IJSEA

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In this paper, two types of raw material, Toddy leaves and sugarcane leaves were used. Leaves are an inexpensive raw material that can be used to extract silica from agricultural wastes, due to silica as a useful raw material for industrial application. In this study, the environmentally benign and economically effective process to produce SiO2 materials from toddy leaves and sugarcane leaves have been established by using citric acid leaching, not the conventional strong acids. The silica content of the product samples was characterized using X-Ray fluorescence (EDXRF), X-Ray powder diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) analysis. The highest silica content (83.9%) was produced by Toddy leaves.

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Removal of metal impurities in rice husk and characterization of rice husk ash under simplified acid pretreatment process

Chen

Fang

et al. 2017

Env Prog and Sustain Energy

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Acid pretreatment plays an important role in the preparation of amorphous silica with high activity and high specific surface area before combustion process. However, some limitations and problems exist in the pretreatment process of previous literatures. On the basis of this, this work is aimed at simplifying the acid pretreatment process and combustion condition, which could present a more advantageous process for practical industrial applications. Then the removal percentage and behavior of metal impurities in rice husk is studied by ICP‐OES, and effects of acid pretreatment on properties of rice husk ash (RHA) at various combustion temperatures are comprehensively investigated in comparison with previous results by scanning electron microscope (SEM), X‐ray fluorescence (XRF), X‐ray diffractometer (XRD), and surface analyzer. The results suggest that the removal degree of each metal is various due to each chemical form in rice husk, of which removal percentage of K is especially remarkable. The contributions of simplified acid pretreatment to the properties of RHA are equally prominent: smaller nanoscale particles, higher purity, and specific surface area of above 200 m2/g. In addition, the pretreatment can also eliminate the crystallization and keep the high activity of RHA in combustion temperature range of 600–900°C. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 830–837, 2017

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Characterization of Biogenic Silica Generated by Thermo Chemical Treatment of Rice Husk

Cited by 48 publications

References 17 publications

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review

Preparation of Silica from Agricultural Leaves waste by Organic Acid Leaching Treatment

Removal of metal impurities in rice husk and characterization of rice husk ash under simplified acid pretreatment process

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