Sorption and desorption of tetracycline on layered manganese dioxide birnessite

Electron Paramagnetic Resonance Stopped-Flow Kinetic Study of Manganese (II) Sorption—Desorption on Birnessite

Many important reactions involving colloidal suspensions are rapid. Here, we introduce the application of a technique capable of rapidly measuring a reactant species (within 20 ms after the reaction initiation) in situ: an electron paramagnetic resonance spectroscopically monitored stopped-flow method (EPR-SF). The utility of this technique is demonstrated by investigating the sorption of Mn on...

An investigation on layered birnessite type manganese oxides for battery applications

Layered birnessite-type manganese oxide was prepared by a simple redox sol–gel reaction involving hydroxylamine and permanganate in alkaline medium. IR, XRD, Auger electron spectroscopy, EPR, TGA and cyclic voltammetric characteristics of the birnessites are presented. The birnessite was examined for its cathode performance in zinc-, magnesiumand lithium-based cells. Bismuth and lead exchanged ...

The Effects of Iron(ii) on Arsenic(iii) Oxidation and Arsenic Sorption/desorption on Manganese Oxides

Co, Cu, Ni, AND Ca SORPTION BY A MIXED SUSPENSION OF SMECTITE AND HYDROUS MANGANESE DIOXIDE

-The sorption properties of Co, Cu, Ni, and Ca were studied in a mixed mineral suspension of synthetic MnO2 and Wyoming montmofillonite. The distribution of the sorbed cations between the two solid phases was measured by indirect chemical fractionation with acidified NH2OH-HC1 and by direct X-ray spectroscopic analysis of mineral particles using electron microscopy. Electron microscope and NH2O...

Study of the radium sorption/desorption on goethite

The oxi-hydroxides, present at trace level in uranium mill tailings, are responsible of about 70% of the 226 radium sorption, half being fixed on crystallized forms. This radionuclide (half time = 1622y), present at high level (50 to 100kBq.kg), can be released in groundwater, involving a possible contamination of the food chain (actual concentration limit = 0.37Bq.l). So, it is very important ...