It is well known that modification of carbonaceous adsorbents with metal
oxides improves their physicochemical characteristics, influencing the catalytic
activity in redox reactions. A number of catalysts consisted of various transition
metal oxides (Co, Ni, Mn, Fe, Cu etc.) on active carbons have been studied for
removal/oxidation of hydrogen sulphide, ammonium ions, dyes etc. Among
these catalysts, manganese oxides supported on active carbons have attracted
much interest due to their high catalytic activities.
The aim of this work was to highlight the influence of surface chemistry
of carbonaceous adsorbents on the manganese oxides loading. The initial
carbonaceous samples, as well as the modified by impregnation with manganese
salts were subjected to thermal analysis in order to choose the treatment
temperatures. The temperatures of 300, 450 and 600ºC have been chosen for
thermal treatment of impregnated samples.
Four series of samples containing manganese supported carbonaceous
adsorbents were prepared. Obtained results reveal the importance of surface
chemistry of carbonaceous adsorbents on the manganese loading.
Samples synthesised from the carbonaceous support with basic surface,
were obtained with a yield of 50-60%, while manganese was loaded in amount
of 1.44-1.65 % depending on applied method. The samples synthesised from the
carbonaceous support with acidic surface, were obtained with a higher yield (92-
98%), but with small quantities of loaded manganese.
Acknowledgements
The present work was performed within Joint Moldova-Belarus Project “Metal supported
catalysts for water treatment: synthesis, properties and using” (no 15.820.18.02.04/B, 2015-
2016).