Iron hydroxides adsorption

Pierce, M.L. Moore, C.B. 1982. Adsorption of arsenite and arsenate on amorphous iron hydroxide. Water Research, 16, 1247-1253. 

Michaelis and Bona loc. cit.) have concluded from an examination of various cases of adsorption, e.g. methylene blue hydrochloride by kaolin and by cellulose and of picric acid by iron hydroxide, that the mechanism is one of ionic interchange and not of promoted hydrolysis. 

Mustafa S, Haq I. 1988. Adsorption of copper, cobalt and nickel on amorphous iron hydroxide from aqueous electrolyte solution. Environ Technol Lett 9 1379-1386. 

Masue, Y., Loeppert, R.H. and Kramer, T.A. (2007) Arsenate and arsenite adsorption and desorption behavior on coprecipitated aluminum iron hydroxides. Environmental Science and Technology, 41(3), 837-42. 

Adsorption affinity of the NOM on aluminum or iron hydroxide floes can be different for different NOM fractions. Bose and Reckhow (2007) showed that the adsorption is increased with increasing charge of the NOM fractions. Preozonation increases the efficiency for removal of the DOC concentration. 

For elements like radium, arsenic, beryllium, thallium, molybdenum and many others, not only the low solubility of the related minerals but also the coprecipitation or adsorption with other minerals, plays an important role. For instance radium is co-precipitated with iron hydroxides and barium sulfate. 

If the number of molecules of Fe(OH)3 is designated by m, and the number of molecules of the ionic stabihzer entering into adsorptional interaction with the nucleus by n, then the micelle of iron hydroxide can be represented in the form of the formula ... 

Levina, S.A. and Yermolenko, N.F., 1955. Structure and adsorption activity of the aluminum, chrome and iron hydroxides depending on conditions of their formation. Koll. Zhum. (Colloid J.), 17, N4 287-294 (in Russian). 

During their colloidal phase manganese and iron hydroxides adsorb different ions from sea-water as described in Chapter 2. This process of adsorption can concentrate ions from very diluted solutions. It is dependent on the concentration of ions offered and on time. 

Because of the different supply of ions for adsorption in the changing environment, and because of different growth rates of mangane nodules (different time for adsorption) it could be expected that the ratio of adsorbed ions to manganese or to iron hydroxide would be regionally different. There are, anyway, some rules which seem to be valid for the greater part of deep-sea manganese nodules ... 

Diphenyl Mercury Adsorption. Adsorption of DPM from seawater onto amorphous iron hydroxide, manganese oxide and bentonite clay was not detected in this study. A comparison of standard diphenyl mercury solutions in seawater with Identical solutions to which sediment phase had been added and shaken for 48 hours was routinely performed as part of the isotherm determination. There was no significant difference in the concentration of dissolved diphenyl mercury for standard. versus standard plus solid phase for any of the suspensions of amorphous, Fe(OH)-, MnO, or bentonite in seawater, implying no significant adsorption of DPM from seawater onto these phases under the concentrations studied. If lower concentrations of DPM could have been used (ppb or lower) it is possible that adsorption might have been detected. 

Results of the adsorption-structural studies on building-up of iron hydroxide particles by aluminium hydroxide followed by calcination have shown that with account of phase and structural changes, the sorption capacity of the samples increases with the calcination temperature and content of Fe20s in their composition (Table 7, samples 5-8). 

Pierce, M. L., and Moore, C. B. (1980). Adsorption of arsenite on amorphous iron hydroxide from dilute aqueous solution. Environ. Sci. Technol. 14, 214-216. 

Kwon, K.D. and Kubicki, J.D., Molecular orbital theory study on surface complex structures of phosphates to iron hydroxides Calculation of vibrational frequencies and adsorption energies, Langmuir, 20, 9249, 2004. 

Davis, J.A., and Feckie, J.O., 1978. Surface ionization and complexation at the oxide/water interface Surface properties of amorphous iron hydroxide and adsorption of metal ions. J. Colloids Interfacial Sci., v. 67, pp. 90-107. 

Tipping, E. (1981) The adsorption of aquatic humic substances by iron hydroxides. Geochim. Cosmochim. Acta 45., 191-199. 

Perdue et al. (1976) observed an excellent linear correlation between the combined concentrations of Fe and Al and DOM in the Satilla River system (southeast U.S.A.). Such a correlation is likely to result from the formation of dissolved organic complexes rather than the adsorption of DOM onto colloidal iron hydroxide particles. Furthermore, using vapour pressure osmometry, Perdue et al. (1976) determined the number-average molecular weight of the DOM to be 1296, thus enabling them to derive an (Fe + Al) DOM stoichiometric binding ratio of 0.8—1.1, in agreement with the values for soil... 

In this work we have determined the amount of lanthanides coprecipitated on iron hydroxide from 10-liter samples of unfiltered sea water previously acidified below pH 2 for some weeks. Experiments with radioactive tracer had shown no adsorption to the containers below pH 4. 

However, this approach proved unsuccessful when applied to soil waters because of adsorption of iron hydroxides or natural organic matter to the enzyme reactor, causing rapid loss of enzyme activity. 

---