Synthetic allophane-like particles: textural properties

Adsorption and co-precipitation behavior of arsenate, chromate, selenate and boric acid with synthetic allophane-like materials

“…The vibration band in the region between 800-400 cm -1 can be attributed to aluminuous allophane subsheet of Al-O and Al-OH bonds [15,16] and probably originated from the octahedral sheet similar to the gibbsitic sheet present in imogolite structures [18,19]. As the Si/Al ratio increases, the intensity of the bands around 680, 580 and 470 also increases.…”

“…The intense vibration around 1000-900 cm -1 can be assigned to Si-O-(Si) or Si-O-(Al) vibration [16] and the shoulder at 870 cm -1 to Si-OH groups [17]. The vibration band in the region between 800-400 cm -1 can be attributed to aluminuous allophane subsheet of Al-O and Al-OH bonds [15,16] and probably originated from the octahedral sheet similar to the gibbsitic sheet present in imogolite structures [18,19].…”

Catalytic behaviour of acid phosphatase immobilized on natural supports in the presence of manganese or molybdenum

“…The allophane has a spheroidal surface morphology (3.5-5.0 nm) and forms regular aggregates (Parfitt, 1990). Furthermore, amorphous aluminosilicates have physical features quite close to those of synthetic gels such as silica supports nanomaterials (Woingnier et al, 2007), such as high surface area (about 1000 m 2 g − 1 ), pore volume and pore size (Montarges-Pelletier et al, 2005;Zhengfei, 2005).…”

Preparation of humidity-controlling porous ceramics from volcanic ash and waste glass

“…The main component of the weathered volcanic ash soil is allophane. This material has many specific properties, and it recently been of interest by many researchers [16][17][18][19][20][21][22]. The molecular structure of allophane contains chain-rings of linked silicate and tetrahedral or octahedral aluminates (four or eight oxygen atoms arranged at the points of a triangular pyramid or parallelepiped around a central silicon or aluminum atom) [18].…”