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This current study successfully synthesized Na2Mn3O7 in two steps. Firstly, the synthesis of MnO from NaCl and MnCl 2 .4H 2 O precursors. NaCl was mixed with citric acid as a chelating agent, while MnCl 2 .4H 2 O was mixed with two types of chelating agents (citric acid and 1% chitosan). The solutions of [NaCl-a chelating agent] and [MnCl 2 .4H 2 O-a chelating agent] were stirred for ±2 hours. The solutions were hydrothermally heated at 150°C for 6 hours and then calcined at 800°C for 1 hour in a nitrogen condition. The MnO presence was then analyzed using an XRD method. As a comparison, another sample was water leached. Then, it was examined by an XRD method. Secondly, the synthesis of Na2Mn3O7 from MnO and Na 2 CO 3  powder was carried out through a solid method. The calcination was carried out at 800°C for ±3 hours in an oxidizing atmosphere. The XRD results showed the presence of Na 2 Mn 3 O 7  in the final products of both samples. Based on these experimental results, the sample [NaCl-citric acid; MnCl 2 .4H 2 O-1%chitosan] showed higher purity than the sample [NaCl-citric acid; MnCl 2 .4H 2 O-citric acid], so that it had a higher intensity of the Na 2 Mn 3 O 7  phase than the sample [NaCl-citric acid; MnCl 2 .4H 2 O-citric acid]. Besides, the Cl -  ions removal after calcination greatly affected the intensity of the MnO and Na 2 Mn 3 O 7  formed.

iop conference series. materials science and engineering

The effect of chelating agents on the formation of manganese oxide (MnO) in the synthesis of sodium manganese oxide (Na2Mn3O7)