Functionalization with amine-containing organosilane of mesoporous silica MCM-41 and MCM-48 obtained at room temperature

Preparation and Characterization of Organically Modified MCM-48 as Heterogonous Catalyst for Oxidation of Sulfides and Thiols

“…Also, steep condensation step in the relative pressure range of 0.1-0.3 observed which is associated with capillary condensation in the channels of MCM-48 and indicating a good structural order. These results are in agreement with those previously reported in the literature [47,48]. Physicochemical and structural parameters of the samples obtained by N 2 isotherms are summarized in Table 1.…”

Template-free synthesis of kaolin-based mesoporous silica with improved specific surface area by a novel approach

“…Nevertheless, the reported mineral-based mesoporous silica is still limited in specific surface area (b 430 m 2 /g for the kaolin-based ones), which is far behind those developed by the template strategy (600-1000 m 2 /g for MCM-41, SBA-15, KIT-6, etc.) (Xu et al, 2012;Lee et al, 2014;Meléndez-Ortiz et al, 2014;Ruiz-Hitzky and Aranda, 2014). Thus, it is still of much significance to develop new technologies to greatly improve the specific surface area of mineral-based mesoporous materials.…”

Extraction of high-purity silica from rice husk via hydrochloric acid leachingtreatment

“…The peak at 2921 cm −1 indicates the presence of the symmetric and asymmetric stretching vibrations of the aliphatic C-H bonds in -CH 3 and CH 2 groups in the structures of cellulose, hemicellulose, and lignin, respectively. The FTIR spectra of extracted silica [26,27] after the preliminary acid washing in Figure 3 showed the same absorption peak at 1055 cm −1 as the raw RH, since the pretreatment method did not significantly change the surface properties of silica. Figures 4 and 5 present the TG curves obtained from the thermal decomposition of treated and untreated RH samples from 50 • C to 850 • C. The obtained curves depict that RH undergoes decomposition in three different stages.…”