1. both of which are hydrophilic groups [71] and can provide coordination sites for positive ions to form structures such as (1,2-PDA-Mn 2+ and 1,2-PPD-Mn 2+ ), leading to an excessive local cation concentration and thus attract VO 3 -until the formation of Mn(VO 3 ) 2 nuclei. Due to the electrostatic effect [72], 1,2-PDA and 1,2-PPD adsorb on the surface of Mn (VO 3 ) 2 nuclei, inducing the formation of Mn (VO 3 ) 2 crystals with a rectangular-like structure, which are aggregated and assembled to eventually form lamellar Mn 2 V 2 O 7 . With the increase of hydrothermal time and temperature, the flake structure grows and eventually forms the "layer-by-layer" Mn 2 V 2 O 7 phase. According to the literature;Nh-);the Mn 2+ dissolved by MnCO 3 has a significant effect on the Mn 2 V 2 O 7 morphology, as shown in Eqs
2. Formaldehyde: Catalytic Oxidation as a Promising Soft Way of Elimination;J Q Torres;ChemSusChem,2013