\Effective removal of methylene blue using nanoscale manganese oxide rods and spheres derived from different precursors of manganese

作者：Ahmed, Saeed^*; Ahmad, Zahoor; Kumar, Anuj; Rafiq, Muhammad; Vashistha, Vinod Kumar; Ashiq, Muhammad Naeem; Kumar, Ashutosh

来源：Journal of Physics and Chemistry of Solids, 2021, 155: 110121.

DOI：10.1016/j.jpcs.2021.110121

• MnO2 nanorods
• Mn3O4 nanosphere
• Pore structure
• Methylene blue
• Removal

Nanoscale manganese oxide with different morphologies were developed at room temperature using different precursor salts (potassium permanganate and manganese sulfate). The obtained nanoscale morphologies, i.e., rod and sphere-shaped were characterized using BET surface area analyzer, SEM, TEM, and XRD. The manganese oxide possessed the rod and sphere-like morphologies with different pore structures. The adsorption of methylene blue on mesoporous manganese oxide followed the pseudo-second-order kinetics and best fitted with the Freundlich adsorption isotherm model with a removal capacity of 2914 mg g(-1). The effect of irradiation time on degradation efficiency was also examined, which followed the first-order kinetics with a degradation efficiency of 93.12%. Furthermore, the recycling studies revealed that the spherical manganese oxide retained over 90% of the photodegradation efficiency after three cycles of methylene blue degradation, which proves its stability for practical applications. Therefore, mesoporous manganese oxide with significant adsorption and remarkable photodegradation capability can provide a way forward to fine-tune the material's properties for effective environmental remediation.