It has been widely recognized that metal removal by activated carbon adsorption is due to the surface complex formation between the metal ions and the acidic surface functional groups. Improvement of Filtrasorb 200 by using several modification approaches is investigated in this study. The carbon was first modified by nitric acid or by citric acid and subsequently by sodium hydroxide. It was fo...

adsorption of p-nitrophenol by three different activated carbons (f100, s.e.i. and b.d.h.) was carried out at 301 k and at controlled ph conditions. two different adsorption models (langmuir model and freundlich model) were studied and compared. the adsorption capacity of the carbons depends on the point of zero charge (pzc) and surface area of the carbons. adsorption of the solute at higher ph...

We have performed density functional theory (DFT) quantum periodic calculations to investigate the interaction between atomic Pd and oxide surfaces of ZrO2(110), MgO(100), and CeO2(110). In this calculation, Pd adsorption energy on the surface oxygen atom sites of those oxide surfaces correlated with the position of the d electron density center of Pd atom except for on the surface metal atom s...

The adsorption behaviour of N20 on the Si(001)2 × ! surface at 300 K substrate temperature has been investigated by measuring in situ the surface conductance during the reaction process. For comparison we monitored in the same way the adsorption of 0 2 on the same surface which ultimately leads to the fiat band situation. The adsorption of atomic oxygen as released by decomposition of the N20 m...

The fabrication and operation of biodevices require the accurate control of the concentration of the bioactive molecules on the surface, as well as the preservation of their bioactivity, in particular proteins that have a significant propensity for surface-induced denaturation. A method that allows the adsorption of proteins on ‘combinatorial’ micro/nano-surfaces fabricated via laser ablation o...

In this study, the adsorptive characteristics of biochar generated from anaerobically digested garden wastes (AD-char) were investigated. Metal adsorption onto AD-chars reached equilibrium in 48 h; the adsorption capacity of Cu by AD-char was 182 μmol g, which was higher than that of Zn (35.3 μmol g) and Mn (60.7 μmol g). The metal adsorption was well described by the pseudo second-order kineti...

Capture of carbon dioxide from fossil fuel power plants via adsorption and sequestration of carbon dioxide in unmineable coal seams are achievable near-term methods of reducing atmospheric emissions of this greenhouse gas. To investigate the influence of surface heterogeneity upon predicted adsorption behavior in activated carbons and coal, isotherms were generated via grand canonical Monte Car...

we have studied the adsorption processes of h2 on the v (100) surface of vanadium using self consistent field theory.dissociative adsorptions of h2 are significantly favored compared to molecular adsorptions. there is a significant charge transfer from the first layer of the vanadium surface to the hydrogen atoms. three possible adsorption sites, top, bridge and center site, were considered in ...

The adsorption of single methanol molecules on the lithium niobate (0001) surface, commonly referred to as Z-cut, is investigated using first-principles calculations. It is found that the binding energy for molecular adsorption on the negative surface (∼1 eV) is about twice as large as for the positive surface. This difference is related to different bond strengths rather than electrostatics. D...