Influences of heat-treatment on the microstructure and properties of silica–titania composite aerogels

Characteristics and application of iron-based materials in heterogeneous Fenton oxidation for wastewater treatment: a review

“…The high porosity and specific surface area facilitate the approach of reaction molecules to the active center, having good adsorption capacity and promising applications in the removal of pollutants from wastewater. 222–228 Gyori et al synthesized highly water-insoluble copper and iron complexes of 5,10,15,20-tetra(4-aminophenyl)porphyrins and covalently bound them to a very hydrophilic silica aerogel matrix made by co-gelation of the porphyrin complex precursor functionalized with propyltriethoxysilane and tetramethoxysilane followed by supercritical carbon dioxide drying. In catalytic experiments on phenol, 3-chlorophenol and 2,4-dichlorophenol, the results showed that the composites were able to catalyze the degradation of phenol and chlorophenol by H 2 O 2 under central conditions and oxidation to harmless short-chain carboxylic acids.…”

SiO2–TiO2 binary aerogels: Synthesis in new supercritical fluids and study of thermal stability

“…The thermal treatment of AG based on SiO 2 -TiO 2 at 300-500°C leads to increase in their specific surface area (S sp ), which is commonly associated with removal of residual organic compounds, while the annealing at higher temperatures (>500°С) results in decrease of S sp and porosity on account of partial structure degradation [28][29][30][31]. As a rule, the phase composition of these AGs remains intact after thermal treatment.…”

Effects of microwave drying on the cell wall structures of round bamboo

“…Bamboo is composed mainly of fiber cells and parenchyma cells and has a highly complex wall structure compared to wood cells (Wang et al 2014). The secondary wall of bamboo is a complex multi-layered structure with continuous thin and thick layers arranged alternately, and there can be more than 10 layers (Parameswaran and Liese 1976).…”