Adsorption capabilities

The above rate equations confirm the suggested explanation of dynamics of silver particles on the surface of zinc oxide. They account for their relatively fast migration and recombination, as well as formation of larger particles (clusters) not interacting with electronic subsystem of the semiconductor. Note, however, that at longer time intervals, the appearance of a new phase (formation of silver crystals on the surface) results in phase interactions, which are accompanied by the appearance of potential jumps influencing the electronic subsystem of a zinc oxide film. Such an interaction also modifies the adsorption capability of the areas of zinc oxide surface in the vicinity of electrodes [43]. 

Keskinkan, O., Goksu, M.Z.L., Yuceer, A., and Basibuyuk, M., Comparison of the adsorption capabilities of Myriophyllum spicatum and Ceratophyllum demersum for zinc, copper and lead, Engineering Life Sciences, 7 (2), 192-196, 2007. 

Li, Y. and Kim, S.J. (2005) Synthesis and characterization of nano titania particles embedded in mesoporous silica with both high photocatalytic activity and adsorption capability. Journal of Physical Chemistry B, 109, 12309-12315. 

Table 1 Adsorption capability of LDHs for various synthetic dyes...

Hydrogen gas is slightly soluble in water, alcohol, and ether. Although it is noncorrosive, it can permeate solids better than air. Hydrogen has excellent adsorption capabilities in the way it attaches and holds to the surface of some substances. (Adsorption is not the same as absorption with a b, in which one substance intersperses another.)... 

The assumption of the significance of emulsifier adsorption capability to the kinetics of emulsion polymerization was suggested in our paper (6), for polar monomers, and by Roe (7) and Robb (8 for styrene. Paxton (2) demonstrated that the adsorption area occupied by a molecule of a given emulsifier (Ha-dodecyl benzyl sulphooate) on the surface of polymethylmethac-rylate latex particles, is 1.31 (nm), and so exceeds by a factor of 2.3 a similar area on the surface of polystyrene latex, equal to 0.33(n>n). ... 

A proprietary hydrogen separation process utilizing the reversible and selective adsorption capability of mixed metal hydrides has been proposed. The hydride, forming compounds, such as LaNi5, FeTi, or Mg2Cu, are in the form of ballasted pellets. 

Fig. 4 shows two STM images of the surface structure of a carbon black. The sample exhibits a specific surface area, determined by N2 adsorption at 77 K, of 15.3 m g, which is almost coincident with its geometric area (16.9 m g ). Therefore, this is a nonporous carbon and its STM images should be expected to differ from those of the ACFs. As a matter of fact, this is what can be observed in Fig. 4. First, it is noted that the carbon black does not display any mesoporosity (Fig. 4a) such as that of the AFCs (Fig. 2). Second, at the micropore scale the carbon black porosity is also very poorly developed (Fig. 4b) in comparison with the pore development of ACFs (e.g.. Fig. 3a). In the former case (Fig. 4b), altough some trenches are also present, they are very shallow and, consequently, are simple topographic variations of a smooth surface and cannot be considered as pores penetrating deeply into the material as in Fig. 3a. Also, pores of the type shown in Fig. 3b for the ACFs were not normally seen on the carbon black surface. Hence, all these observations agree with the lack of adsorption capabilities of this material.

We have found that the waste wood and used tealeaves showed high adsorption capabilities for ammonia gas in low equilibrium pressure (< 13.3 kPa). The amount of the adsorbed ammonia for these carbonized materials were much higher that of the activated carbon Granular Shirasagi GS3 x 4/6. These results suggest that the carbonized materials from organic wastes could be utilized as adsorbents for ammonia... 

The Chitopearr resin was packed in a glass column (inner diameter 1. 4 cm, bed height 4.3 cm). The column was first equilibrated with a 20 mM MES buffer containing 20 mM NaCI and 10 mM 2-mercaptoethanol. Then 60 ml of the MES buffer containing metal ion was applied at the flow rate of O.S ml/min. Adsorption capabilities of the ligands were examined for cadmium, gallium, cupric, zinc, or nickel ion. After the column was washed with MES buffer, the adsorbed metal ion was eluted with the MES buffer (pH of which was adjusted to pH 2.0). In order to examine effects of pH on the adsorption, pH of the MES buffer was varied from pH S to pH 9. The eluted solution was collected as several fractions of 10 ml each, and the metal concentration of each fraction was determined with atomic adsorption analysis (SAS 7S00A, Seiko Instruments, Japan). Total amount of the eluted metal ion was defined as the adsorbed metal ion on the resin. The total amount of the adsorbed metal ion was divided by the total amount of immobilized protein to calculate the number of metal molecules bound to one mole of the protein. The adsorption experiments were carried out multiple times, and the maximum experimental error was 25%. 

The recorded differences in adsorption capability indicate a different mechanism of interaction between the carbon surface and the ionic metal species pre.sent in the aqueous solution (aqua and hydroxy complexes, hydroxide ions, and electronegative complexes). To discover the state of the adsorbed. species, some independent measurements of the surface layer of adsorbent were carried out. The selected carbon samples were studied by the XPS method in powdered form following copper uptake (Figs. 42 and 43). Several peaks attributable to carbon, oxygen, nitrogen, and copper were present. The XPS survey spectra of the initial modified carbons (before adsorption) were discussed in the previous section. The surface elemental composition estimated from XPS data for modified D43/1 car-... 

The functional groups present in charcoal are phenols, carboxylic acids, quinones, ketones and lactones. They are essentially acidic supports. The nature and extent of the functionalities on the charcoal particle surface are a function of the material used in the carbonization and the type and duration of the activation procedure. In addition, treatment of these charcoals with oxidizing agents such as nitric acid or hydrogen peroxide increases the number of acid species present. A similar treatment will also functionalize the non-porous carbon blacks.25 Because of this it is difficult to draw any general conclusions concerning the adsorption capabilities of these charcoals other than to say that being acidic they will most readily adsorb cationic species. 

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