Adsorption of Strontium from Acidic Waste Solution by Mn–Zr Mixed Hydrous Oxide Prepared by Co-Precipitation

Removal of strontium(II) and cobalt(II) from acidic solution by manganese antimonate

“…A hydrous MnO 2 -TiO 2 solid solution with an amorphous structure, has a much greater affinity to Sr 2+ at pH=7 than the single oxides [9]. A hydrous MnO 2 -ZrO 2 composite could efficiently uptake Sr 2+ ions from aqueous solutions at lower pH values (pH = 4) [16,18,19]. Based on these former successful trials, it seems that the adsorption properties of MnO 2 can be improved by doping with acid-resistant oxides.…”

“…Since then, MnO 2 has been widely studied as a sorbents for divalent cations, such as Sr 2+ , Co 2+ , UO 2 2+ , Cu 2+ , Cd 2+ , Pb 2+ and Zn 2+ [11][12][13][14][15]. The typical K d value for Sr 2+ adsorbed onto MnO 2 is reported to be 100 mL/g [9,16], and the adsorption capacity of Co 2+ onto synthetic nano-manganese oxide is as high as 25 mg/g [11]. This shows that MnO 2 has good adsorption properties both for Sr 2+ and Co 2+ ions.…”

“…This shows that MnO 2 has good adsorption properties both for Sr 2+ and Co 2+ ions. However, like for many other good sorbents for Sr 2+ and Co 2+ ions, manganese oxides achieve their best adsorption performance in alkaline media [16,17]. In addition, MnO 2 is known to be unstable at pH values less than 5 [10].…”

Facile Synthesis of Fe3O4-N-[(3-Trimethoxysilyl)propyl]ethylenediamine Triacetic-acid Trisodium Salt and Adsorption of Sr 2+

“…Maybe it is because adsorption sites reach saturation. In general, the adsorption capacity of Sr 2+ increases with the increase of initial concentration [21,22]. However, compared to the selected concentration range in this paper, the concentration ranges they choose are narrow.…”

Preparation of ZrO2 and ZrO2–TiO2 microspheres by the sol–gel method and an experimental design approach to their strontium adsorption behaviours

“…Although there are other sorbents showing higher adsorption capacity towards strontium in the literature [8,10,[18][19][20][21], the prepared ZrO 2 -TiO 2 sorbent seems to be advantageous with easy preparation by the sol-gel process, spherical shape allowing to be used in column applications, chemical, mechanical and thermal resistance.…”