Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: manganese(II) ion

Sortuj według:

Ogranicz wyniki do:

Usage of Sorbent-Catalyst to Accelerate the Oxidation of Manganese

Gomelya Mykola, Tverdokhlib Mariia, Shabliy Tetyana, Linyucheva Olga

Journal of Ecological Engineering

2021

Vol. 22, nr 4

232--239

The processes of manganese (II) ions removal from water using sorbent catalysts and ion exchange materials modified with iron oxides were studied. It was shown that manganese ions oxidize very slowly in artesian water, even when the pH is adjusted to 9.0. Intensive aeration of solutions due to stirring also does not promote the oxidation of manganese (II) ions. The degree of manganese extraction due to oxidation is reduced from 20–30% for solutions with a concentration of manganese ions of 1 and 5 mg/dm3 to 11–15% for solutions with a concentration of 15 and 30 mg/dm3. A significant increase in the oxidation efficiency of manganese ions was achieved by using magnetite as a sorbent catalyst. The efficiency of water demanganization increases along with the intensity of water aeration when mixing solutions. It was established that strongly acid cation exchangers provide efficient extraction of manganese ions from water. At the same time, a high exchange capacity of strong acid cation exchange resin KU-2–8 in acid and salt form was noted. It was shown that the capacity of manganese ions of this cation exchange resin in the Ca2+-form is slightly lower. When using the KU-2–8 in Ca2+-form of cation exchange resin to remove manganese ions from the solution already in the first samples, the leakage of manganese ions at the level of 10 mg/dm3 and above was observed. This indicates that this form of ion exchanger is not suitable for deep purification of water from manganese (II) ions. In order to increase the efficiency of manganese ion extraction from water, increase the duration of the filter cycle, magnetite and magnetite-modified KU-2–8 cation exchange resin were used as a sorbent-catalyst. It was shown that the cation exchange resin modified with magnetite provides the removal of a significant part of manganese ions due to catalytic oxidation on magnetite. The conditions of effective manganese extraction under static and dynamic conditions are determined.

Crystal Structure, Spectroscopy and Thermal Study of Manganese (II) Complex with Sarcosine

Rzączyńska Z., Mrozek R., Sikorska-Iwan M.

Polish Journal of Chemistry

2002

Vol. 76 / nr 1

29-35

A polymeric manganese(II) complex of sarcosine [Mn(sar)2(H2O)2]Cl2 (where sar = sarcosine) has been prepared and characterized by elemental, spectroscopic, thermal, magnetic and X-ray investigations. X-ray crystallographic study shows that the octahedral- coordinated manganese(II) ion is situated in the crystallographic center of symmetry and is bound to four carboxylate oxygen atoms of different sarcosine molecules and two water molecules. Two non-coordinated chloride ions are located between the chains. IR spectra of the free ligand and the complex have been discussed. This complex is stable up to 378 K, later loosing water and transforming into oxides. The gas-phase products of decomposition have been analyzed by FTIR spectra.