Iron oxide, simulation studies

Zinc and zinc-coated products corrode rapidly in moisture present in the atmosphere. The corrosion process and its mechanism were studied in different media, nitrate [283], perchlorate [259], chloride ions [284], and in simulated acid rain [285]. This process was also investigated in alkaline solutions with various iron oxides or iron hydroxides [286] and in sulfuric acid with oxygen and Fe(III) ions [287]. In the solution with benzothia-zole (BTAH) [287], the protective layer of BTAH that formed on the electrode surface inhibited the Zn corrosion. 

For the simulation studies a test reaction was chosen where the separation in a reduction and an oxidation step is necessary. The steam iron process was used in the twenties for hydrogen production from coal [12]. It includes a reduction of an iron oxide (mostly FesO )... 

The objective of the present study is to examine the desorption kinetics of Cd following its adsorption on iron oxides. To simulate the effects of organic ligands in soil rhizosphere environment and chloride-bearing fertilizer, Cd desorption caused by citrate, acetate and chloride was investigated. 

In a recent study, a commercial membrane sample was coated 20 or 40 times with 4 to 6nm iron oxide nanoparticles (65). With this membrane, the concentration of dissolved organic carbon was reduced by >85% and the concentrations of simulated distribution system total THMs and HAAs decreased by up to 90% and 85%, respectively. When the coated membranes were used, the concentrations of aldehydes, ketones, and ketoacids in the permeate were reduced by >50% as compared to that obtained with the uncoated membranes. Hydroxy or other radicals produced at the... 

Nelson, L. S., Buxton, L. D., and Planner, H. N., "Steam Explosion Triggering Phenomena. Part 2 Corlum-A and Corium-E Simulants and Oxides of Iron and Cobalt Studied with a Floodable Arc Melting Apparatus," Sandia National Laboratories, Albuquerque, NM, NUREG/CR-0633, SAND79-0260, May 1980. 

Figure 20 Raman spectrum of (top) a standard of magnetite (Fc304) and (bottom) iron particles take from a column that had been treated with simulated groundwater solutions. (Reprinted with permission from MS Odziemkowski, TT Schuhmacher, RW Gillham, EJ Reardon. Mechanism of oxide film formation on iron in simulating groundwater solutions Raman spectroscopic studies. Corros Sci 40 371-389, 1998. Copyright 1998 Elsevier Science.)...

MS Odziemkowski, TT Schuhmacher, RW Gillham, EJ Reardon. Mechanism of oxide film formation on iron in simulating groundwater solutions Raman spectroscopic studies. Corros Sci 40 371-389, 1998. 

Reductive dissolution was also studied by determining the oxidation state (2- -or 3-f) of the iron during simulated, dynamic scale dissolution tests. The ratio of Fe(ll)EDTA /Fe(lll)EDTA can be determined by measuring the redox potential (emf) of the solution. For a one electron change at 77°F (25°C), the Nernst equation... 

The mill scale utilized in this study is formed in a continuous casting plant and is of non-oily nature. Other than iron oxides of different valence states, it contains metallic iron and impurities. Table I displays the chemical analysis of the mill scale. In the SHS experiments, a mixture of Mill-scale, NiO, Cr203, M0O3 and A1 powders were used in order to produce metallic Fe, Fe-Ni, Fe-Ni-Cr, and Fe-Mo alloys. The metal oxide powders have over 96 % purity and 200 pm average grain sizes. The advanced thermochemical simulations of the reactions were... 

For the purpose of studying the effect of the inorganic matrix origin on iron protoporphyrin biomimic activity in methane oxidation to methanol the above-mentioned carriers of the acidic-basic type were used. According to data in Tables 7.4 and 7.5, mimics derived from them simultaneously simulate catalase reaction and monooxygenase function of cytochrome P-450. 

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