batch experiments were conducted to study the adsorption behaviors of lead ion (pb2+) onto ferrihydrites prepared using three different procedures which were characterized  by textural analysis (bet). the adsorption removal of pb2+ by the three ferrihydrites (called fh-1, fh-2 and fh-3, respectively) were compared, and fh-3 shows fast adsorption kinetics as well as high adsorption capacities, t...

The ability of cynodon dactylon based thermally activated carbon to remove fluoride from aqueous solution has been investigated. The batch adsorption studies were carried out at neutral pH as the functions of contact time, adsorbent dose, adsorbate concentration, temperature and effect of co-anions, which are commonly present in water. The rate of adsorption was rapid during initial 105 minutes...

The term sorption is generally used to describe the initial penetration and the dispersal of the permeant molecules into food matrices (Chirife and Iglesias 1978) and, more generally, into all kinds of polymers (Naylor 1989; Tsujita 1992). This term includes adsorption, absorption into microvoids, and cluster formation. When a food matrix is placed in a humid atmosphere, the relationship betwee...

The BET equation is commonly used to describe type II sigmoid isotherms of water contaminants. However, there are some that do not agree with the equation. In this paper, three modified equations (Aguerre–Suarez–Viollaz, Pantuso–Tolaba–Aguerre, and Aranovich–Donohue) evaluated against published isotherm data dysprosium, reactive blue 5G, naphthenic acid. cases studied, shown outperform original...

A theoretical model was selected among three potentially applicable models and then used to analyze the absorption isotherms of hydrogen storage alloys LaNi5 LaNi4.75Pb0.25 at different temperatures (T = 303 K, 313 323 K). The expressions were based on statistical physics formalism simplifying hypotheses. one with highest correlation experimental data. had six adjustable parameters: number atom...

The biofiltration technique is of great importance for the removal heavy metals. In present work, a laboratory-scale biofilter was modeled using rice husk as filter material. Wolborska model used to know dimensions necessary function. Langmuir and Freundlich isotherms were performed quantify adsorption process, showing that are ones highest correlation coefficient best represent process Cd (II)...