Study of the effects of lanthanum and the iron ion on the acidic properties of Al-pillared vermiculite

Abstract

The synthesis of porous materials has attracted interest for decades due to their applications in catalysis and gas adsorption. 7 + (where x equals the molar amount of lanthanum), followed by calcination, may cause variation in the acidic properties. The analyzes showed that increasing the amount of La on oligomer results in a higher acidity shown in the spectrum a characteristic band in the region of 1445 and 1545cm -1 to Lewis and Brönsted respectively, predominantly of the last one. The Mössbauer spectroscopy results showed a relationship between increased symmetry of the octahedral site of iron (Fe 3+ ) and increased lanthanum doping, and consequently a sharp increase in acidity.

Characterization of the Physicochemical Properties of the Biosurfactant Produced by L. Acidophilus and L. Pentosus

“…Study by [20] reported that the surface activity of the biosurfactants produced by some strains of B. subtilis remained stable even after treatment with NaCl at 7%. Similarly, [21] investigated the effect of different NaCl concentrations on biosurfactant activity produced by Lactobacillus isolates. He found that surface tension did not suffer any pronounced change with increasing NaCl concentrations, except a very small variation from 43.4 mN/m to 46.3 mN/m at higher concentration of NaCl tested.…”