Adsorptive capacity and evolution of the pore structure of alumina on reaction with gaseous hydrogen fluoride.

Brunauer-Emmet-Teller (BET) specific surface areas are generally used to gauge the propensity of uptake on adsorbents, with less attention paid to kinetic considerations. We explore the importance of such parameters by modeling the pore size distributions of smelter grade aluminas following HF adsorption, an industrially important process in gas cleaning at aluminum smelters. The pore size distributions of industrially fluorinated aluminas, and those contacted with HF in controlled laboratory trials, are reconstructed from the pore structure of the untreated materials when filtered through different models of adsorption.

Anionic surfactant enhanced phosphate desorption from Mg/Al-layered double hydroxides by micelle formation.

Desorption of interlayer hydrogen phosphate (HPO4) from hydrogen phosphate intercalated Mg/Al-layered double hydroxide (LDH-HPO4) by anion exchange with surfactant anions has been investigated under controlled conditions. Three types of surfactant, Dodecylbenzenesulphonate (DBS), Dodecylsulphate (DS) and 1-Octanesulphonate (OS), anions were used for intercalation experiments over a range of concentrations, and for all solutions, it was shown that the desorption of hydrogen phosphate is enhanced at concentrations close to the critical micelle concentration (CMC). Intercalation of the surfactant anions into LDH-HPO4 was confirmed by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) and Scanning electron microscopy (SEM).

The influence of surface structure on H4SiO4 oligomerization on rutile and amorphous TiO2 surfaces: an ATR-IR and synchrotron XPS study.

Silicic acid (H(4)SiO(4)) is ubiquitous in natural aquatic systems. Applications of TiO(2) in these systems will be influenced by H(4)SiO(4) sorption and oligomerization reactions on the TiO(2) surface, and this can affect many aspects of TiO(2) reactivity. The spatial arrangement of sorption sites on a metal oxide surface can promote specific lateral interactions, such as oligomerization, between sorbed species.

Nanostructured aniline oxidation products: self-assembled films at the air/liquid interface.

With the use of the "falling pH" approach, the free floating films obtained at the air/liquid interface during aniline oxidative polymerization in the presence of hydrochloric acid have been reported and characterized for the first time. The surface of the films is compact and consists of small densely packed particles (around 10-20 nm in diameter). In addition to the free floating films the precipitation of various self-assembled nanostructures was also observed.