Sorption behavior of 85Sr onto manganese oxides with tunnel structure

Morphological Features and Sorption Performance of Materials Based on Birnessite Exposed to Various Reductive Conditions

“…Layered manganese oxides exhibit an inferior performance in the presence of 0.05 M CaCl 2 as compared to the δ-MnO 2 and its derivatives (0.87 × 10 3 vs. 1.9 × 10 3 , 2.5 × 10 3 and 3.0 × 10 3 mL g −1 , respectively). Such a difference in sorption characteristics are even more surprising taking into account an exceptional surface area of the reference manganese oxide with BET specific surface area reaching 212 m 2 g −1 [36]. Lower distribution coefficients are caused by mixed phase composition of the compared oxides, while in this work the obtained birnessites exhibit single-phase composition in case of non-reduced samples as well as the appearance of MnO(OH) after N 2 H 4 -treatment.…”

“…This can be attributed to higher specific surface area and higher availability of sorbent's active sites. Note high distribution coefficients the studied sorbents demonstrate, if we compare them to the systems obtained using similar synthesis procedure (by interaction of KMnO 4 and H 2 O 2 ) [34][35][36]. Layered manganese oxides exhibit an inferior performance in the presence of 0.05 M CaCl 2 as compared to the δ-MnO 2 and its derivatives (0.87 × 10 3 vs. 1.9 × 10 3 , 2.5 × 10 3 and 3.0 × 10 3 mL g −1 , respectively).…”

“…Lower distribution coefficients are caused by mixed phase composition of the compared oxides, while in this work the obtained birnessites exhibit single-phase composition in case of non-reduced samples as well as the appearance of MnO(OH) after N 2 H 4 -treatment. Such phase compositions facilitate the sorption of Sr 2+ , while the content of actually sorption active phase (K 2 Mn 4 O 8 ) is not so high in the mentioned works according to XRD patterns [34][35][36]. Sorption under dynamic conditions provided the information on the sorbents' performance under conditions close to the real technological operation.…”

Synthesis of a MnO2/multiwalled carbon nanotube nanocomposite and its application as a sorbent for removing Cu2+ ions from aqueous media

“…Carbon nanotubes (CNTs), nano‐oxides/nanometals, nanoactive powder, nanocomposites, … are very common sorbents for removing dyes and ions from the aqueous media. It is worthwhile to mention that the very small quantities of some ions such as Cl − , I − , Na + , K + , Zn 2+ , Cu 2+ , Sr 2+ … are required for the health of human bodies, but their consumption in large quantities cause poisoning and sometimes cause cancer, nervous immune system disorder, and in the several cases cause death …”

“…It is worthwhile to mention that the very small quantities of some ions such as Cl − , I − , Na + , K + , Zn 2+ , Cu 2+ , Sr 2+ … are required for the health of human bodies, but their consumption in large quantities cause poisoning and sometimes cause cancer, nervous immune system disorder, and in the several cases cause death. [1][2][3][4][5][6][7][8] 2 | EXPERIMENTAL…”