Development of Room Temperature Curing Geopolymer from Calcined Water-Treatment-Sludge and Rice Husk Ash

A new approach has been demonstrated for the synthesis of solid ammonium sulphate attached to silica rice husk ash. The 3-(aminopropyl)triethoxysilane was immobilized onto silica at room temperature to functionalize the silica with ammine end groups (–NH2). The amine group was sulphated with sulphuric acid to produce a novel micro-rod-like shaped acidic catalyst (as seen with TEM) designated RHNH3SO4H (RH = rice husk). The TGA analysis shows that the catalyst is stable at temperatures below 200°C. The acidity measurement of the catalyst indicates that it has Brønsted acid sites. Cellulose extracted from waste of rice husk and cellulose extracted from office paper were hydrolysed to glucose in 6 h, and the glucose was hydrolysed afterwards to other products within 13 h. The catalyst is reusable many times without a significant loss of catalytic activity.

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Silica Nanoparticles from Rice Husk Ash: A Green Catalyst for the One-Pot Three-Component Synthesis of Benzo[B]Furan Derivatives

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.875-877.202 ◽

2014 ◽

Vol 875-877 ◽

pp. 202-207 ◽

Cited By ~ 3

Author(s):

Ali Ramazani ◽

Morteza Rouhani ◽

Sang Woo Joo

Keyword(s):

Silica Nanoparticles ◽

Rice Husk ◽

Room Temperature ◽

Rice Husk Ash ◽

One Pot ◽

Furan Derivatives ◽

Green Catalyst ◽

Iminium Ion ◽

The One ◽

High Yields

Reaction of an isocyanide with an iminium ion intermediate, formed by reaction between an electronpoor 2-hydroxybenzaldehyde derivative and a secondary amine in the presence of silica nanoparticles proceeds smoothly at room temperature to afford benzo [b] furan derivatives in high yields.

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Synthesis of Geopolymer Paste as Coating Material Based on Kaolinite and Rice Husk Ash

Materials Science Forum ◽

10.4028/www.scientific.net/msf.841.79 ◽

2016 ◽

Vol 841 ◽

pp. 79-82 ◽

Cited By ~ 5

Author(s):

Ruth Meisye Kaloari ◽

Syamsidar ◽

Sulfiana ◽

Abdul Haris ◽

Subaer

Keyword(s):

Thermal Properties ◽

Rice Husk ◽

Fire Protection ◽

Room Temperature ◽

Chemical Resistance ◽

Rice Husk Ash ◽

Good Condition ◽

Coating Material ◽

Coated Material ◽

Geopolymer Paste

The purpose of this research is to study the properties of geopolymer paste based on metakaolin and rice husk ash (RHA) as coating material. Geopolymer paste was produced through alkaline activation method added with rice husk ash as much as 15% relative to the mass of metakaolin. The coating was achieved by painting the substrates with geopolymer paste. The coated material were cured at 60 °C for 3 hours. Samples were left at room temperature until seven days before any testing was conducted. The chemical resistance of the sample was studied by immersing the samples into (H2SO4) 1% for three days and it was found that the coated material was still in good condition. The presence of RHA was found to improve the thermal properties of geopolymer paste. The results showed that geoplymer paste was an excellent coating material for chemical and fire protection.

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Microstructure and Dielectric Properties of 0-3 Cement/Rice Husk Ash-Lead Niobate Zirconate Titanate Ceramic Composites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.804.119 ◽

2015 ◽

Vol 804 ◽

pp. 119-123

Author(s):

Nittaya Jaitanong ◽

Arnon Chaipanich

Keyword(s):

Dielectric Properties ◽

Portland Cement ◽

Rice Husk ◽

Room Temperature ◽

Ordinary Portland Cement ◽

Rice Husk Ash ◽

Ceramic Composites ◽

Particle Sizes ◽

Zirconate Titanate ◽

Titanate Ceramic

The microstructure and dielectric properties of lead niobate zirconate titanate (PNZT), rice husk ash (RHA) and Ordinary Portland cement (OPC) composites were investigated. Ordinary Portland cement was partially replaced with rice husk ash at 20% by weight of binder. The rice husk ash was ground for 180 minutes before using. PNZT of mid particle sizes (450μm) were used at 30%, 50% and 70% by volume to produce the composites. The composites were mixed and pressed together and cured with 97%RH in chamber water bath for 3 days before measurements. The dielectric properties were measured under room temperature at different frequency. The results indicated that the dielectric constant of the 0-3 PC/RHA-PNZT composites increased with increasing PNZT content.

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