Magnesium isotope separation by ion exchange using hydrous manganese(IV) oxide

Magnesium oxide impregnated polyurethane to remove high levels of manganese cations from water

“…Mn 3 O 4 or dMnO 2 has negative charges when pH is higher than their pH ZPC , inducing the adsorption of trace metals [33][34][35], and its sorption capacity increases as pH increases [34]. Therefore, Mg(II) released by the dissolution of MgO and dissolved Mn(II) in solution could be removed by sorption and coprecipitation with Mn 3 O 4 or dMnO 2 [11,18,36,37]. As shown in reaction 4, the oxidation of Mn(II) into Mn 3 O 4 can causes the dissociation of H + , and eventually decreases the solution pH.…”

Manganese oxide nanostructures: low-temperature selective synthesis and thermal conversion

“…Manganese oxides (MnOx) are of considerable importance in technological application, including catalysis, 1 energy storage, 2 microwave absorption, 3 magnetism, 4 biosensors, 5 and ion exchange 6 owing to their outstanding structural diversity combined with novel chemical and physical properties. A large number of manganese oxides are possible due to the availability of various oxidation states of manganese (II, III, and IV).…”

Studies on the adsorption behavior of trace amounts of 90Sr2+, 140La3+, 60Co2+, Ni2+and Zr4+ cations on synthesized inorganic ion exchangers

“…Ion exchangers have been used extensively in treating rinse water wastes in plating industry for example, where valuable metals are recovered at costs comparable to or less than conventional chemical treatment, with appreciable saving in space for treatment plant. Also, a large number of ion exchangers such as zeolites, sodium titanates, titanosilicates, hexacyanoferrates, acidic salts of multivalent metal, salt of heteropolyacids and hydrous oxides have been investigated for removal of fission products ( 137 Cs, 90 Sr) and activation corrosion products such as 60 Co, 63 Ni, 65 Zn, 51 Cr, 54 Mn, 59 Fe and 95 Zr from nuclear waste [5][6][7][8][9][10][11][12][13][14][15][16]. The major attraction in the use of inorganic ion exchangers in such applications compared with synthetic organic ones is their high thermal and radiation stabilities and compatibility with matrices used for their immobilization.…”