Molded micro- and mesoporous carbon/silica composite from rice husk and beet sugar

Kumagai, Seiji; Ishizawa, Hirotaka; Aoki, Yumiko; Toida, Yasuhiro

doi:10.1016/j.cej.2009.10.016

Cited by 27 publications

(9 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The highest density measured was 2.08±0.03 gcm -3 , which is without particulates both RHA and aluminum. This is reasonable as a higher linear shrinkage occurs and the lower value of total porosity for this samples [4]. Density strictly depends on the sintering linear shrinkage and total porosity.…”

Section: IIsupporting

confidence: 57%

“…Research works involving the utilisation of agro-industrial waste have discovered that important elements exist in waste materials which can be used in a wide range of engineering applications. Almost all of the waste materials have a high percentage of silica, SiO2, content amongst their other constituents such as alumina, Al2O3, calcium oxide, CaO, potassium oxide, K2O and others [2][3][4]. From previous studies, rice husk ash is one of the most silica-rich raw materials, containing about 90-98% of crystalline silica (after burning) among other waste materials [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural, Physical and Mechanical Analysis of Rha Pore Modified Porous Alumina With Aluminum as Reinforcement

Najib

Ariff

Tahir

et al. 2019

AEJ

View full text Add to dashboard Cite

Porous ceramics are being used in many industrial applications and processes that require extreme environment exposure due to its chemical inertness to corrosive medium and its ability to withstand high temperatures. Tailoring the porosity through pore modifier is one of the method available to ensure that the strength of ceramic is homogeneous. In order to improve the strength of the porous ceramic, the addition of aluminium powders was explored in this research. With the addition of agricultural waste source pore modifier and aluminium as reinforcement, the microstructure, linear shrinkage, porosity (open, closed and total), density, hardness and failure strength of this ceramic composite were examined. The ceramic composites were fabricated through powder metallurgy processing routes. Alumina, Al2O3 with the respective amounts of 0 to 10 wt.% (intervals of 10 wt.%) of RHA and 0 to 10 wt.% (intervals of 2 wt.%) of aluminum, Al, were mixed homogeneously with 12 wt.% of sucrose solution. The mixtures were compacted and heat-treated for 1 h at each of the soaking temperatures of 200°C, 600°C and 1000°C followed by full sintering at 1550°C for 2 h in a furnace. The results have shown that open and total porosity increases with increasing amounts of RHA and aluminum. Meanwhile, the linear shrinkage, close porosity, density, hardness and failure strength was reduced. In this research, the strength was expected to increase with the addition of aluminum. However, due to the increasing percentage of the total porosity with the increased addition of aluminum, the samples behave inversely. Phase transformations to mullite (3Al2O3. 2SiO2) were seen in this research with the addition of RHA. This phase formation helps to increase the overall strength of the ceramic composites, showing that 10 wt% addition of RHA have a positive impact, not only as a medium to modify the pore formation, but it also has a positive effect on the strength property of the ceramic composite.

show abstract

Section: IIsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Microstructural, Physical and Mechanical Analysis of Rha Pore Modified Porous Alumina With Aluminum as Reinforcement

Najib

Ariff

Tahir

et al. 2019

AEJ

View full text Add to dashboard Cite

show abstract

“…Figure 3 b shows the XRD patterns of the CSCs. A peak at 22° which is characteristic of the cristobalite structure of silica was observed for all spectra [ 34 , 44 ]. The intensity of this broad peak was less intense in CSC600, confirming the higher carbon to silica ratio as seen in TGA and CHN analysis.…”

Section: Resultsmentioning

confidence: 99%

“…Sucrose has been used as a safer more sustainable carbon source [33]; however, there are concerns over the use of high-quality and high-cost food products for the production of chemicals, materials and fuels. Low-cost beet sugar syrup can be used as an effective carbon source for the preparation of CSCs [34], thus highlighting the potential for the exploitation of low-value by-products of the sugar industry. With the production of sugarcane worldwide reaching 1.9 billion tons in 2016, a high volume of by-products/wastes including sugarcane tops and leaves from the field, bagasse and molasses from the sugar industry can be envisaged in the future [35].…”

Section: Introductionmentioning

confidence: 99%

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

et al. 2020

View full text Add to dashboard Cite

Highly porous carbon-silica composites (CSC) were prepared for the first time through a simple wet impregnation process and subsequent pyrolysis of low-value sugarcane by-products, namely molasses. These CSC materials demonstrate a distinct range of functionalities, which significantly differ from similar materials published in the literature. Importantly, the carbon-silica composites prepared at 800°C exhibited exceptional adsorption capacities for the azo-dye congo red (445 mg g −1 ), due to the graphitic carbon coating and unique functionality including C-O-C within the porous structure. Congo red adsorption capacity of the highly mesoporous graphitic carbon-silica composites significantly exceeds that of commercial activated carbon and silica, these carbon-silica composites therefore represent an effective step towards the development of porous bio-derived adsorbent for remediation of dye wastewaters. Both the porous properties (surface area and pore size distribution) and the functionality of the carbon coating were dependent on the temperature of preparation. The sustainable synthetic methods employed led to a versatile material that inherited the mesoporosity characteristics from the parent silica, demonstrating mesoporous volumes greater than 90% (as calculated from the total pore volume). Adsorption on the 800°C prepared carbon-silica composites demonstrated an excellent fit with the Langmuir isotherm and the pseudo-first-order kinetic model.

show abstract

“…In recent years, activated carbon materials have been made from organic waste. These materials include Kraft lignin [11], rice husks [12–14], fir wood [15], bamboo [16], seaweed biopolymer [17], rice husk and eucalyptus [18], cherry pits [19], potato starch [20], sugar cane bagasse [21], wheat straw [22], fish scales [23], sunflower seed shells [24], coconut shells [25], and argan ( Argania spinosa ) seed shells [26]. Coffee beans [27, 28], coffee grounds [29, 30], coffee endocarp [31], and coffee husk [32] are also being studied as raw materials for activated carbon.…”

Section: Introductionmentioning

confidence: 99%

Microporous activated carbons from used coffee grounds for application to electric double-layer capacitors

Tashima

Hamasuna

Mishima

et al. 2014

IEEJ Trans Elec Electron Eng

Self Cite

View full text Add to dashboard Cite

Electrochemical double-layer capacitors (EDLCs) are devices that store enormous amounts of charge electrostatically when a potential is applied between electrodes of very high surface area (typically made of porous carbon) and an electrolyte. Wider commercialization of this technology has been held back by the lack of ultralow-cost electrode materials. We demonstrate that used coffee grounds can be processed to form low-cost electrodes. The surface and electrochemical characteristics of microporous activated carbons from used coffee grounds (CGCs) were measured. First, optimal times and temperatures for carbonization and activation were identified on the basis of Brunauer-Emmett-Teller (BET) surface area, pore volume, and pore size distribution. Second, CGCs were used as polarized electrodes in EDLCs, whose capacitances were evaluated using cyclic voltammetry. The results show that carbonization for 1 h at 600 • C with a heating rate of 300 • C/h, followed by CO 2 activation for 2 h at 1000 • C, affords the highest BET surface area (1867 m 2 /g) compared to other works. The produced CGCs have many micropores of less than 2 nm across, which contribute to the formation of an electric double layer. Capacitors made using these CGCs show the highest capacitance (103 F/g) in 0.8 M (C 2 H 5 ) 4 NBF 4 /PC as an organic electrolyte, which is much higher than the ∼80 F/g typically used in organic-electrolyte-based commercial EDLCs, suggesting that coffee grounds are a useful electrode material.

show abstract

Molded micro- and mesoporous carbon/silica composite from rice husk and beet sugar

Cited by 27 publications

References 17 publications

Microstructural, Physical and Mechanical Analysis of Rha Pore Modified Porous Alumina With Aluminum as Reinforcement

Microstructural, Physical and Mechanical Analysis of Rha Pore Modified Porous Alumina With Aluminum as Reinforcement

Graphitic mesoporous carbon-silica composites from low-value sugarcane by-products for the removal of toxic dyes from wastewaters

Microporous activated carbons from used coffee grounds for application to electric double-layer capacitors

Contact Info

Product

Resources

About