Preparation of porous diatomite-templated carbons with large adsorption capacity and mesoporous zeolite K-H as a byproduct

Possible mechanism of structural incorporation of Al into diatomite during the deposition process I. Via a condensation reaction of hydroxyl groups

“…2) are assigned to the siloxane bridge (Si(OSi) 4 ), single silanols (Si(OSi) 3 (OH)), and the geminal silanol (Si(OSi) 2 (OH) 2 ) of diatomaceous silica, respectively [12]. The signal of the Si(OSi) 4 group is much stronger than the others, showing a predominant formation among all of the silicon groups of Dt. The weak shoulder peaks of the single and geminal silanols imply that their amounts are small, which is consistent with the results in our previous study.…”

“…Diatomite is primarily composed of amorphous hydrated silica (SiO 2 ÁnH 2 O), which is categorized as non-crystalline Opal-A, according to the mineralogical classification [3,4]. Diatomite is easily obtained at very low cost and has many unique physical and chemical characteristics, enabling their wide uses in a variety of applications for high-performance technologies; thus and widely utilized [5][6][7][8]2,[9][10][11][12].…”

Enhancement of diatomite solid acidity by Al incorporation, as evaluated by the catalytic effects on the thermal decomposition of 12-aminolauric acid

“…Diatomite is primarily composed of amorphous hydrated silica (SiO 2 ·nH 2 O), which is categorized as non-crystalline opal-A, according to the mineralogical classification [3][4][5]. Because diatomite has macroporous structures with pore sizes that range from the nanometric to the micrometric domains [2,6], it has been widely used as adsorbents [7][8][9][10][11], supports [12][13][14][15][16][17][18], and templates of macroporous materials [2,6] [19][20][21][22].…”

“…In our previous study [20][21][22][23], the inherent solid acidity of diatomite was utilized to catalyze the decomposition of furfuryl alcohol to prepare diatomite-templated carbon with a unique macroporous structure. However, the catalytic activity of diatomite is ordinary because of the small number and weak acidity of these solid acid sites and because of the lack of Lewis (L) acid sites in the structure of diatomaceous silica.…”

Preparation and characterization of konjac glucomannan-acrylic acid-diatomite composites

“…The hydrophilicity of these groups makes KGM a better raw material for super absorbency [10,11]. Diatomite (DT) or diatomaceous earth which consists of a wide variety of shaped and sized diatoms, typically 10-200 mm, in a structure containing up to 80-90% voids, is a kind of soft, pale-colored, lightweight sedimentary rock which is principally composed of the silica microfossils of aquatic unicellular algae [12,13]. DT has a three-dimensional network configuration and DT's highly porous structure, low density, high surface area, chemical inertness, and being sterile which results in a number of industrial applications, such as filtration media for various organic and inorganic chemicals as well as fillers, filling material, catalyst carriers, absorbents, light construction material, and silica source in chemical material manufacturing [14].…”