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Abstract
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In this study, highly efficient Mn4(P2O7)3 nanoflakes were successfully synthesized and characterized by SEM, TEM, XRD and XPS. Mn4(P2O7)3 nanoflakes applied as an inexpensive adsorbent and nanozyme to remove organic pollutants (methylene blue, MB) from water. The equilibrium adsorption studies showed that the organic dye followed Langmuir model of adsorption. The adsorption mechanism is based on the electrostatic interaction between the deprotonated (negatively charged) group in Mn4(P2O7)3 and MB cationic molecules; then, in basic solution the adsorption capability of Mn4(P2O7)3 remarkably increased. In addition, the applicability of Mn4(P2O7)3 catalase mimic in organic wastewater reclamation was exhibited via catalytic degradation of MB organic pollutant. The heterogeneous catalytic process performed at basic pH in the presence of H2O2 via reactive oxygen species (ROS) production. Experimental results indicated that superoxide radical was the main active species in degradation process of MB. Under the basic condition, the leaching of ions, which mainly occurs in the Fenton reaction, is significantly reduced. Water purification is done more efficiently by incorporating of adsorption and degradation method. It was found that the removal efficiency of MB (initial concentration at 40 mg/L) achieved to 99.2% after 30 min. Furthermore, the Mn4(P2O7)3 sample could be reused in water treatment process many times without a considerable decrease in its adsorption and catalytic efficiency. This stable and recyclable system might present a new sight for developing sufficiently low-cost and highly efficient nanomaterials for waste water treatment.
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