Vinyl-Methyl Substituted Silica Aerogel-Like Hybrids as Effective Oil/Organic Solvent Sorbents

Research Square (Research Square), Journal Year: 2023, Volume and Issue: unknown

Published: Aug. 8, 2023

Abstract This work aimed to develop vinyl/methyl-decorated silica-based aerogel-like hybrids and evaluate their performance as novel oil/organic solvent adsorbents. Silica were prepared in two series by co-condensation of vinyltrimethoxysilane (VTMS) either with methyltrimethoxysilane (MTMS) (VM-series) or tetraethylorthosilicate (TEOS) (VT-series) followed surface methylation TMCS at ambient pressure. By gradual vinyl substitution, the changes physicochemical morphological properties monitored using complementary characterization techniques, such FTIR, 29 Si-NMR, SEM, N 2 porosimetry, small angle neutron/X-ray scattering contact measurements. The results confirmed significant structural VT-series increasing VTMS content, whereas it had only a limited effect on network formation VM-series. In VT-series, samples predominantly mesoporous nature, even up high content (75 mol%), resulting large specific area values (792–1021 m /g). However, VM-series, mostly macroporous emerged sponge-like monolithic form after drying very low densities (0.087–0.182 g/cm 3 ) porosities (87.2–93.9%). successful vinyl/methyl substitution also resulted good hydrophobicity (up 147°) each series. Owing its lightweight structure hydrophobicity, VT-100 VM-50 highest sorption capacities 11.63 g/g for 10.92 VT-100) most organic pollutants stable 10 cycles. free-standing structure, well-developed porous network, enhanced hydrophobic behavior superior adsorption make these materials excellent sorbents oil spill remediation applications.

Language: Английский

Rapid Microwave-Assisted Synthesis of Organo-Modified Nanostructured Silica Coatings with Tunable Water-Repellence Properties

Coatings, Journal Year: 2021, Volume and Issue: 11(11), P. 1319 - 1319

Published: Oct. 29, 2021

A simple method to fabricate organo-modified silane coatings for water-repellent surface modification was proposed, by using a microwave sol-gel synthesis of hybrid materials. Low-cost fluorine-free tetraethoxysilane (TEOS) and dodecyltriethoxysilane (DDTES) were used as derivatives. The silica prepared the drop-casting characterized UV-VIS, FTIR spectroscopy, AFM SEM microscopy. morphology film show existence submicrometer scale roughness due aggregation modified nanoparticles. Contact angles water diiodomethane on surfaces with nanostructured determined in order assess hydrophobic oleophobic properties. TEOS/DDTES ratio proved be crucial factor tuning wettability results suggest that significant increase hydrophobicity could achieved non-fluorinated cost-effective nanomaterials produced rapid ecofriendly method.

Language: Английский