Copper , sorption

Cavallaro N., McBride M.B. Zinc and copper sorption and fxation by an acid soil clay effect of selective dissolutions. Soil Sci Soc Am J 1984a 48 1050-1054. 

Sunda W. G. and Hanson A. K. (1987) Measurement of free cupric ion concentration in seawater by a ligand competition technique involving copper sorption onto Cl8 SEP-PAK cartridges. Limnol. Oceanogr. 32, 537-551. 

We can see that after treatment, the relative content of Mcrcs was sharply decreased. The predominant sorption of Zn was connected with Zucx and Zncarb forms, whereas the predominant copper sorption was in Cu rg form. The role of Me(K-+Mn)ox form was significant for both studied metals. In general, increasing amount of sorbed metal was connected with the increase of less bounded forms. 

Cavallaio, N, and M IL McBride. 1984. Zinc and copper sorption and fixation by an acid soil clay Ef-Iccl of sclcelivr dissolution. Soil Sci. Soc. Am. J. 48 1050- 1054. 

Gonzalez-Chavez, C., D Haen, J., Vangronsveld, J., Dodd, J.C., 2002. Copper sorption and accumulation by the extraradical mycelium of different Glomus spp. (arbuscular mycorrhizal fungi) isolated from the same polluted soil. Plant Soil 240, 287-297. 

The mechanism of complex formation of metals with chitosan is manifold and is probably dominated by different processes such as adsorption, ion exchange, and chelation under different conditions. In Fig. 15.6, it can be seen that the sorption capacity of chromium and cadmium is similar, while zinc has approximately double the affinity of these two metal ions for chitosan. Chitosan has almost three times the removal capacity for copper sorption than that for cadmium or chromium. These effects have proved complex to interpret but are a function of a number of parameters ionic radii ionic charge electron structure and possibly some hydration capacity of the metal ions solution pH and nature and availability of sites for chitosan. 

Karthikeyan, K. G., H. A. Elliott, and J. Chorover. 1999. Role of surface precipitation in copper sorption by the hydrous oxides of iron and aluminum. Journal of Colloid and Interface Science 209, no. 1 72-78. doi 10.1006/jcis.1998.5893. 

In a study of copper sorption to ternary systems composed of organic matter (leaf compost), ferrihydrite and montmorillonite (Martfnez-Villegas and Martmez 2008), and its time evolution over 8 months, it was found that copper sorption followed the order organic matter > silicate clays > iron oxides (Figure 14.11a). Within each solid... 

Thus, our results oppose the popular opinion, that it is not ix>ssible to sorb simultaneously in comparable amounts chloroplatinate anion and dope cation on the surface of amphoteric and basic supports from the acid impregnating solutions at the synthesis of bimetal catalysts. Note, however, that a noticeable suppression of copper sorption by Pt limits the catalyst synthesis via a simultaneous deposition from the solutions with the known Pt content and Cu/Pt ratio. Our experiment results show, that only for Pt concentrations less than 0.5 wt.% we can obtain a wide range of Cu/Pt ratios. At the Pt concentration exceeding 1 wt.%, the obtained ratio shall be less than 2. Moreover, the registered acceleration of Pt... 

Chanda, M., and Rempel, G.L., Poly(ethylene imine)-based granular sorbents by a new process of templated gelfilling High capacity and selectivity of copper sorption in acidic and alkaline media, Ind. Eng. Chem. Res., 34(8), 2574-2583 (1995). 

Vieira AP, Santana SAA, Bezerra CWB, Silva HAS, Melo JCP, Silva EC, Airoldi C. Copper sorption from aqueous solutions and sugar cane spirits by chemically modified babassu coconut (Orbignya speciosa) mesocarp. Chem Eng J 2010 161 99-105. 

Cuzman, J Saucedo, I Revilla, J Navarro, R Cuibal, E. Copper sorption by chitosan in the presence of citrate ions Influence of metal speciation on sorption mechanism and uptake capacities. International Journal of Biological Macromolecules, 2003, 33, 57-65. 

The copper-chelating abihty of sahcylaldoxime has been used to remove copper from brine in a seawater desalination plant effluent. A carbon—sorbate bed produced by sorption of the oxime on carbon proved to be extremely effective in the continuous process (99). In another apphcation, the chelating abihty of sahcylaldoxime with iron and copper was used to stabilize bleaching powders containing inorganic peroxide salts (100). 

Regarding submerged plants, sorption of Cu(II) by Myriophyllum spicatum L. (Eurasian water milfoil) has been shown to be fast and fits isotherm models such as Langmuir, Temkin, and Redlich-Peterson. The maximum sorption capacity (c/lll l j ) of copper onto M. spicatum L. was 10.80 mg/g, while the overall sorption process was best described by the pseudo-second-order equation.115 Likewise, Hydrilla verticillata has been described as an excellent biosorbent for Cd(II). In batch conditions, the qmsx calculated was 15.0 mg/g. Additionally, II. verticillata biomass was capable of decreasing Cd(II) concentration from 10 to a value below the detection limit of 0.02 mg/L in continuous flow studies (fixed-bed column). It was also found that the Zn ions affected Cd(II) biosorption.116... 

Wu J., Laird D.A., Thompson M.L. Sorption and desorption of copper on soil clay components. J Environ Qual 1999 28 334-338. 

Hall et al. (2001) measured the biosorption of copper by P. syringae, fitting the experimental data to the Freundlich, Brunauer-Emmett-Teller (BET), and Langmuir equations. Meaningful maximum sorption capacities... 

Hall C, Wales DS, Keane MA (2001) Copper removal from aqueous systems biosorption by Pseudomonas syringae. Separ Sci Technol 36(2) 223-240 Haas JR, Dichristina TJ, Wade R Jr (2001) Thermodynamics of U(VI) sorption onto Shewanellaputrefaciens. Chem Geol 180 33-54 He LM, Tebo BM (1998) Surface charge properties of and Cu(II) adsorption by spores of the marine Bacillus sp. strain SG-1. Appl Environ Microbiol 64 1123-1129... 

A technique for the determination of free cupric ions in seawater has been described by Sunda and Hanson [332], The method is based on sorption of copper onto Sep-Pak Cis cartridges and internal free cupric ion calibration. Calibration is accomplished by adding cupric ion buffers and EDTA, which competes with natural organic ligands for copper complexation. The method was used to establish that 0-2% of the copper occurs as inorganic species and 98-100% occurs as organic complexes. 

Van den Berg, C. M. G., and J. R. Kramer (1979), "Conditional Stability Constants for Copper Ions with Ligands in Natural Waters", in E. Jenne, Ed., On Chemical Modeling Speciation, Sorption, Solubility and Kinetics in Aqueous Systems, ACS Symp. Series. 

Cadmium is found naturally deep in the subsurface in zinc, lead, and copper ores, in coal, shales, and other fossil fuels it also is released during volcanic activity. These deposits can serve as sources to ground and surface waters, especially when in contact with soft, acidic waters. Chloride, nitrate, and sulfate salts of cadmium are soluble, and sorption to soils is pH-dependent (increasing with alkalinity). Cadmium found in association with carbonate minerals, precipitated as stable solid compounds, or coprecipitated with hydrous iron oxides is less likely to be mobilized by resuspension of sediments or biological activity. Cadmium absorbed to mineral surfaces (e.g., clay) or organic materials is more easily bioaccumulated or released in a dissolved state when sediments are disturbed, such as during flooding. 

Christl, I. R. Kretzschmar (1999) Competitive sorption of copper and lead at the oxide-water interface Implications for surface site density. Geochim. Cosmochim. Acta 63 2929-2938... 

Swaddle, T.W. Oltmann, P. (1980) Kinetics of the magnetite-maghemite-hematite transformation, with special reference to hydrothermal systems. Can. J. Chem. 58 1763-1772 Swallow, K.C. Hume, D.N. Morel, F.M.M. (1980) Sorption of copper and lead by hydrous ferric oxide. Environ. Sci. Tech. 14 1326-1331... 

A fourth application is a convenient assessment of the removal of a transition metal by a supported chelator vs sorption on the substrate. It appears that the supported chelators were able to remove copper ion in a quantitative manner, but a goodly proportion (83%) was removed by sorption on silica gel. In contrast, a Linde molecular sieve (alone) with fairly defined pores removed about half of the copper ion through sorption. 

When preparing the cesium- and barium-saturated clays, the 1.0 M solutions used were decanted (after centrifuging) and analyzed semiquantitatively by emission spectroscopy. From those analyses, it appears that the following species were desorbed sodium, potassium, calcium, magnesium, and strontium. It further appeared that desorption of potassium was almost unique to cesium sorption whereas, desorption of the other species appeared to be common to both cesium and barium sorption. Small amounts of other elements such as nickel and copper were also detected by the analyses. However, to what extent the observed concentrations may represent desorption and to what extent they may represent the dissolution of sparingly soluble substances (particularly hydroxide species) is as yet-uncertain. The apparent concentrations of the desorbed species per gram of clay are given in Table III. 

We described elsewhere the Hg(0) vapor sorption of commercial CuS [10]. The relative rate of Hg(0) uptake for commercial grade cuS is 12.8 mmoles/day compared with 70 mmoles/day for CTAB mediated CuS. The sorption properties of the particle-size-mediated synthesized covellite, CuS, is likewise reflective of a redox process that results in the formation of cinnabar, HgS, and the copper(I) sulfide chalcocite, CU2S, according to Reaction (1) ... 

When the reactant CuS converts completely, a 51 wt% increase is achieved with respect to the initial mass of covellite. The synthetic copper sulfide samples used in this study contained -20-30 wt% CU2S. Table 2 lists Hg(0)-sorption and purity data for the two copper sulfide samples studies. Even without pure covellite, the rate of Hg(0) sorption was as high as 12 wt%/day at 90°C. 

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