Morphologically controlled synthesis of porous Mn₂O₃microspheres and their catalytic applications on the degradation of methylene blue

Abstract

A B S T R A C T Porous Mn 2 O 3 microspheres are controllably synthesized by selectively etching MnCO 3 precursor with HCl solution. Morphologies and microstructures of Mn 2 O 3 microspheres are analyzed by SEM, TEM, XRD, and N 2 sorption technique. The catalytic performances of Mn 2 O 3 microspheres for the degradation of methylene blue (MB) are investigated, and the reaction kinetics of MB degradation is also studied. The results show it is feasible to control the morphologies of Mn 2 O 3 microspheres by adjusting the concentration of HCl solution, and the well-developed porous Mn 2 O 3 microspheres demonstrate good potential on MB degradation. The degradation reactions follow the pseudo-first-order kinetic model, and the degradation capabilities for MB are great dependent on BET surface areas and pore volumes of Mn 2 O 3 microspheres.

Facile Synthesis and Electrochemical Studies of Mn2O3/Graphene Composite as an Electrode Material for Supercapacitor Application

“…The average crystallite size of Mn 2 O 3 metal oxide ceramic was estimated from the most intense peak occurring at 2θ ∼ 32.92° that corresponds to (222) the plane of the cubic structure of Mn 2 O 3 by using the Deby–Scherer equation, which was found to be 22.67 nm ( Zhang et al, 2009 ; Lee, 2014 ). The XRD profile of Mn 2 O 3 reveals well-defined and prominent Bragg reflection peaks which correspond to Mn 2 O 3 stoichiometry of the compound ( Tao et al, 2016 ; Rafique et al, 2017b ).…”

O-Vacancy-Rich ε-MnO2 Synthesized at Hydrophobic Interface: An Efficient Fenton-like Catalyst for Removing Ciprofloxacin from Water

“…Equally, the adjacent metal manganese (Mn) has been widely used in AOPs due to its low cost, abundance in nature and relatively low toxicity. Many studies have illustrated and explained the effectiveness of different manganese oxides for activating PMS, such as α-, β-, and γ-MnO 2 [19], Mn 2 O 3 [20] and Mn 3 O 4 [21]. These results indicate that the different crystalline manganese oxides have various degradation effects on pollutants.…”