Copper, adsorption

Low-density polyethylene containers are suitable for storing seawater samples at 4 °C and natural pH, provided that they are thoroughly cleaned (in 2 M hydrochloric acid for at least a week) and adequately conditioned (with prefiltered seawater for at least one to two weeks). Storage can be prolonged for at least three months (or five months for cadmium) without significant concentration changes. For lead and copper, adsorption losses are observed after five months. 

Copper Adsorption on chitosan, extraction with 1,10 phenanthro-line AAS < 0.1 pg/1 [841]... 

Copper Adsorption on hydroxyquinoline, dithizone or diethyldithiocarbamate modified charcoal Miscellaneous [301]... 

Copper Adsorption on silica modified with 8-quinolol Flow injection AAS - [868]... 

Copper Adsorption on basic Amberlite GC-400 anion exchange resin, elution with nitric acid AAS 0.013 pg/1 [869]... 

Copper Adsorption on Qg resin Laser excited atomic fluorescence spectrometry with a graphite electrothermal atomiser 0.001 pg/1 [241]... 

Langmuir-Hinshelwood heterogeneous hydrogenation on copper adsorption constants h vary from 3 to 10 m only 25% of the copper surface covered with fructose which, fortunately, reacts much faster than glucose adsorbed on the copper catalyst. 

The dependence of adsorption properties and texture on electrolytic palladium deposits on the deposition potential was investigated by Tsirlina et al. [116]. It was found that, in sulfuric acid solutions, the palladium dissolution, which accompanies the oxygen adsorption, obscures the adsorption behavior of the deposits with respect to oxygen. Assumptions were made about the predominant crystallographic orientation (100) of the surface of some palladium deposits being dependent on the deposition potential and about the presence of regions whose adsorption properties are anomalous with respect to copper. The assumptions are based on a comparative analysis of the copper adsorption data and x-ray diffraction patterns. In addition to sites of crystalline palladium, the deposits were found to have disordered areas as well. 

Zarzyeki, R. et al., The effect of chitosan form on copper adsorption, in Environmental Engineering Studies, edited hy Pawlowski et al., Kluwer Academic/Plenum Publishers, New York, 2003. 

The possible interactions and surface structures presented above (Schemes 11-13) describing copper species sorbed on various modified active carbon samples have been deduced from the results obtained. It seems that the dominant mechanisms of copper adsorption on heat-treated active carbon (D—H sample) could be dipole-dipole (n-d) interactions between graphene layers and metal ionic species and the spontaneous electrochemical reduction of copper ions. For oxidized active carbon samples (D—Ox, CWZ—Ox), surface ionization and the ion-exchange mechanism can describe cation sorption from aqueous solutions. 

Figure 6.2. Fit of the Freundlich adsoiption isotherm equation to copper adsorption by two soils. (From Kurdi and Doner, 1983.)...

Figure 6.3. Fit of the Langmuh adsoi-ption isotherm equation to copper adsorption by a soil. (From Cavallaro and McBride. 1978.)...

Figure 6.6. Fit of the diffuse layer model to copper adsorption by hydrous ferric oxide. The solid line represents the optimal ht for these data. The dashed line represents the fit corresponding to the best overall estimate of the Cu surface complexation constant obtained from 10 Cu adsorption edges. (From Dzombak and Morel. 1990.)...

This set of equations can be approximated with hand calculations or solved using a computer program such as the one described by Dzombak and Morel (1990). An example fit of the diffuse layer model is indicated in Figure 6.6 for copper adsorption to hydrous ferric oxide. 

Rgure 24.1 Influence of pH on copper adsorption onto an activated carbon cloth [8]. 

These values are given in Table 24.4 for two initial concentrations of metal ions, 20 and 40mg/L [33]. Values obtained for complexation constants are of the same order of magnitude as that obtained for copper adsorption onto a GAC,... 

Chen, J.P., Wu, S., and Chong, K.H., Surface modification of granular activated carbon by citric acid for enhancement of copper adsorption. Carbon, 41, 1979, 2003. 

Modeling Nonlinear Kinetic Behavior of Copper Adsorption-Desorption in Soil... 

In the same Figures the effect of copper content on the catalytic activity can be observed for both Cu-HZSM5 and Cu-NaY catalysts. In fact, a decrease of NOx conversion from 34 to 25% at 400°C was observed when the copper content of Cu-HZSM5 was lowered from 3.28 to 0.92 wt%. Similarly, a maximum NOx conversion of only 12% was obtained for Cu-NaY containing 2.49 wt% of copper. Adsorption effects do not allow significant differences in hydrocarbon... 

Allan, D.L., Jarrell, W.M., 1989. Proton and copper adsorption to maize and soybean root cell walls. Plant Physiol. 89, 823-832. 

Dufey, J.E., Braun, R., 1986. Cation exchange capacity of roots titration, sum of exchangeable cations, copper adsorption. J. Plant Nutr. 9, 1147-1155. 

Kaoser S, Barrington S, Elektorowicz M, Wang L. (2004a). Copper adsorption with Pb and Cd in sand-bentonite liners under varions pHs. Part I. Effect on total adsorption. Journal of Environmental Science and Health 39(09) 2241-2256. 

Li, N. and Bai, R. 2005. Copper adsorption on chitosan-cellulose hydrogel beads Behaviors and mechanisms. Sep. Purif. Technol. 42, 237-247. 

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