“…Pore volume reduction occurs from 0.22 cm 3 /g to 0.12 cm 3 /g, while pore diameter remains at about 18 nm, which reflects the loading of drugs inside lumen of Hal. Gorbunova et al (2020) has reported that coating with PEG tends to interact with hydroxyl group of silanol groups forming a hydrogen bonding, results in polycondensation. Fig.…”
“…Pore volume reduction occurs from 0.22 cm 3 /g to 0.12 cm 3 /g, while pore diameter remains at about 18 nm, which reflects the loading of drugs inside lumen of Hal. Gorbunova et al (2020) has reported that coating with PEG tends to interact with hydroxyl group of silanol groups forming a hydrogen bonding, results in polycondensation. Fig.…”
“…Despite this, BIS synthesis suffers from a lack of control over the structure of the nal product. Some examples exist of mesoporous silica syntheses that follow bio-inspired methods using arginine-based surfactants, and milder synthesis using polyethylene glycol or a range of surfactants, [24][25][26][27] however the materials produced remained poorly ordered with broad pore size distributions, thus hampering their performance compared to OMS materials that possess well ordered, monodisperse pores (see Fig. 2 28 ).…”
Bio-inspired methods offer a great alternative to design high-value mesoporous silica under more environmentally friendly conditions, allowing for the economical and sustainable scale-up. However, the synthesis of bio-inspired silica (BIS)...
“…The ether oxygen atoms of PEG (-δO-CH 2 -CH 2 -) have a high affinity for Si-OH silanol groups. Therefore, it plays the role of proton acceptors in the hydrogen bonding between PEG macromolecules and primary silica particles [16]. Based on [17], cure times can be shortened and increase productivity by covering silanol groups on the silica surface using PEG.…”
Section: Synthesis and Characterization Of Peg-coated Silicamentioning
The effect of coating silica with polyethylene glycol on the adsorption of iron and phosphate ions in industrial wastewater was investigated. Variable factors were temperature and time of coating, PEG concentration, and PEG to silica ratio. Infrared spectroscopy and scanning electron microscopy were used to evaluate the chemical structure and morphology of PEG-coated silica. Optimum iron and phosphate ions removal efficiency was obtained using a coating temperature of 50°C, a coating time of 15 min, a PEG concentration of 20%, and a PEG to silica ratio of 1:3.
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