Systematic evaluation of amorphous silica production from rice husk ashes
By J. A. Costa, C. Paranhos. Journal of Cleaner Production, 2018
234 citations recorded by the source corpus.
Abstract Amorphous silica (SiO2) was extracted from the rice husk ashes (RHAs) of the agulhinha and cateto varieties. Optimized time, temperature, extractor concentration, and reaction time for a sustainable and cleaner production of SiO2 from RHAs were studied. Textural and internal structures were analyzed by N2 adsorption-desorption isotherms. The percentage of SiO2 in the treated rice husks (RHs) increased by approximately 11 and 12% for the agulhinha and cateto varieties, respectively. The silica present in the RHAs remained predominantly amorphous for all of the times and temperatures investigated. The optimum parameters for calcination of the RHs were: 2 h at 700 °C. Type IV isotherms with type H1 hysteresis and good specific surface area values were observed. The optimum parameters for extraction of the amorphous silica were: concentration of 4 mol L−1 NaOH and 4 h of reaction. The extraction yield values were 80–99% and 83–97% for the agulhinha and cateto RHAs, respectively.
Subfields: Biomaterials, Building and Construction, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/d23bf440fad3c2841dcb9392c3a50e20d34d0b10
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Biomaterials
Citations in the corpus
- Rice husk/rice husk ash as an alternative source of silica in ceramics: A review (2018, background): “34 Costa and Paranhos [46] Alkali extraction 200–339 63–170 nm 95.”
- Green technology extraction and characterisation of silica nanoparticles from palm kernel shell ash via sol–gel (2020, background): “to O H bond bending vibration from Si OH silanol groups, while 3338 cm−1 to 34,750 cm−1 is due to O H bond stretching vibration from Si OH silanol groups and are due to adsorbed H2O molecules on the silica surface [18,19].”
- Recent progresses in the adsorption of organic, inorganic, and gas compounds by MCM-41-based mesoporous materials (2020, background): “There is still much to be discussed and researched in the field to obtain sustainable and inexpensive silica sources with high efficiency in the sustainable development of new advanced multifunctional materials [107].”