In this study, the adsorption and desorption kinetics of lanthanum (La) on micro algal cells was investigated. The internal transcribed spacer (ITS) and 18S ribosomal RNA gene (rRNA) were used for molecular identification of the species. The algal species were found to have 95-98% identities to Desmodesmus multivariabilis, Scenedesmus acuminutus, Chloroidium saccharophilum and Stichococcus baci...

Reflection absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) have been used to perform a detailed investigation of the adsorption of water on highly oriented pyrolytic graphite (HOPG) at 90 K. RAIRS shows that water is physisorbed on HOPG at all coverages, as expected. Experiments at higher surface temperatures show marked changes in the O-H stretching region ...

Water sorption/desorption behaviour of the materials is very relevant for their application in pharmaceutical, food, sensor, electronics, fuel cell and biomedical fields. The sorption/desorption equilibrium, which is related with the plasticity and mechanical properties of the materials, as well as the kinetics of water sorption/ desorption, which is related to the transport properties, are int...

Mg2NiH4 is a promising hydrogen storage material with fast de hydrogenation kinetics. Its hydrogen desorption enthalpy, however, is too large for practical applications. In this paper we study the effects of transition metal doping by first-principles density functional theory calculations. We show that the hydrogen desorption enthalpy can be reduced by 0.1 eV/H2 if one in eight Ni atoms is rep...

The low-temperature cyclotrimerization of acetylene to benzene on alumina thin film supported Pd particles of controlled size has been studied by temperature-programmed desorption. The reactively formed benzene is observed to desorb in three distinctly separate features with kinetics resembling those observed for acetylene cyclotrimerization on Pd single crystals. An enhanced activity for low-t...

The glycerol desorption from the ion exchange and adsorbent resin Purolite PD206 was studied using conventional and supercritical fluids techniques. Untreated biodiesel was purified by dry washing using the resin and, after purification, the glycerol desorption was carry out using three diferent solvents: absolute ethanol under atmospheric conditions at different mass flows (10 and 30 g/min), o...

We present a Boltzmann equation-based model for transport and reaction in micrometer-scale features such as those found in integrated circuit fabrication. We focus on the adsorption and desorption of one species to understand the transient responses to step changes at the reactor scale. The transport model has no adjustable parameters; the assumptions are detailed. Adsorption and desorption rea...

Many experimental studies of protein deposition on solid surfaces involve alternating adsorption/desorption steps. In this paper, we investigate the effect of a desorption step (separating two adsorption steps) on the kinetics, the adsorbed-layer structure, and the saturation density. Our theoretical approach involves a density expansion of the pair distribution function and an application of a...

The sorption behaviors of 4 cyclic and linear volatile methyl siloxane (VMS) compounds between water and organic matter in 3 United Kingdom soils were studied by a batch equilibrium method using(13)C-enriched sorbates. Sorption and desorption kinetics and isotherms were determined for octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), octamethyltrisiloxane (L3), and decamethy...

Kinetics of the deposition process of dimers in the presence of desorption is studied by Monte Carlo method on a one-dimensional lattice. The aim of this work is to investigate how do various temporal dependencies of the desorption rate hasten or slow down the deposition process. The growth of the coverage θ(t) above the jamming limit to its steady-state value θ(∞) is analyzed when the desorpti...