Kinetics of hydroxide Fe(III) solid phase formation

Modified Inorganic Polymer Flocculant-PFSi: Its Preparation, Characterization and Coagulation Behavior

“…Obviously, to preform stable Fe(III) polymers, it needs to cross the first precipitation zone (roughly 0:25B*50:5) and prevent homogeneous amorphous precipitation ðB*> 1:5Þ. Despite numerous investigations, the mechanism of hydrolysispolymerization-precipitation of Fe(III) and the quantitative principles are still not perfectly clear (Van De Woude and De Bruyn, 1983;Melikov, 1987;Khoe and Robins, 1989). The nature and behavior of hydrolysis products are controlled by many factors, such as the components and concentration of the primary Fe(III) solution, pH, components of coexisting anions, temperature, time of aging, traces of contaminants including dust particles, which can seed the precipitation of the solid, preparation methods and other topchemical transformation.…”

Condensation route of evolution of nanodispersed substances

“…This development takes place in all systems in which the parameter a satisfies the condition a >> υ 0 /4πl 2 . (16) When condition (16) is fulfilled, then in closed sys tems at the nucleation and growth stages, Eq. (6) is appli cable and nanoparticles have a broad size distribution.…”

Stabilization of iron-catalysed hydrogen peroxide decomposition by magnesium

“…Hydrolysis products range from simple monomeric species such as F~O H~+ , through dimers and trimers including F e 2 ( 0~) 2 4 + , to polymeric species represented by [Fe(OH),(N03)3-,],, where n -900 (26). The behaviour of such systems has been studied in detail at low pH (27)(28)(29)(30)(31), where attainment of equilibrium can occur very slowly, even requiring weeks or months. The evolution of iron species in strongly alkaline media appears to be less well defined, although 'J.…”