The selective dissolution of rice hull ash to form [OSiO1.5]8[R4N]8(R = Me, CH2CH2OH) octasilicates. Basic nanobuilding blocks and possible models of intermediates formed during biosilicification processes

Solar Grade Silicon from Agricultural By-products

“…[12][13][14] Other sources of biogenic silica could potentially be used in this process. For example, we plan to extend this technology to the high silica content waste of biofuels produced by algae.…”

“…Mayaterials has long experience extracting SiO 2 from RHA as OA, the starting material for our core silica cage business, Scheme 1. [12][13][14] We have developed detailed methods of extracting most of the SiO 2 out of RHA at low temperatures (≈ 100°C) with short processing times, 5-7 h at 0.5-1 kg quantities. 2.…”

Silica dissolution as a route to octaanionic silsesquioxanes

“…We recently described kinetic studies on RMe 3 NOH (R = Me or CH 2 CH 2 OH) promoted dissolution of rice hull ash (RHA) as a simple, direct and high yield route to the octaanions, [OSiO 1.5 ] 8 [NMe 3 R] 8 . 1,2 As a result of these studies, we suggested that the choline derivative (R = CH 2 CH 2 OH) resembles a potential intermediate in the mechanism whereby diatoms extract silica from seawater, and store and transport it prior to using it to form the intricate structures within which they live. The implication is that the biosilicification process wherein millions of tons of silica, present in seawater as Si(OH) 4 , is transformed into biological structures may use nanosized silica building blocks like [OSiO 1.5 ] 8 8− in the process.…”

Ionic‐liquid‐assisted mixed alkali system for reactive dye fixation in a batch process – optimisation through response surface methodology

“…The IL choline hydroxide (ChOH), also biodegradable and non-toxic, can be synthesised from ChCl, and it has been reported to possess a strong basic nature [26]. Also, it has been used in the synthesis of biocompatible surfactants [31] and in the selective dissolution of rice hull ash [32] after making it into 45% methanolic solution. Also, it has been used in the synthesis of biocompatible surfactants [31] and in the selective dissolution of rice hull ash [32] after making it into 45% methanolic solution.…”