Controllable Synthesis of Mn3O4 Nanowires and Application in the Treatment of Phenol at Room Temperature.

Runlin Han,Min Chen,Xiaobing Liu,Yuhang Zhang,Yan Sui,Yongli Xie

doi:10.3390/nano10030461

Abstract

Nanosized Mn3O4 nanowires are prepared with KMnO4 and ethanol in mild conditions by facile hydrothermal method. Hydrothermal reaction temperature is optimized to get uniform nanowires. The prepared Mn3O4 nanowires exhibit high activity in the treatment of phenol at acid condition and room temperature. The 20 mg Mn3O4 nanowires can efficiently dispose of 50 mL phenol solution (0.2 g·L−1) at pH 2 and 25 °C. The nanowires before and after phenol treatment are characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and the reaction mechanism is discussed.

Highlights

Manganese is one of the most earth-abundant elements and manganese oxides are generally non-toxic
Lu et al prepared the amorphous MnO2 thin film first hydrothermally transformed it into Mn3O4 nanowires under room temperature in a solution bath of 0.01 M manganese acetate and 0.01 M sodium sulfate mixture [5]
Uniform Mn3O4 nanowires are fabricated with facile hydrothermal method and common raw materials in mild conditions. They are utilized to deal with phenol solution without extra H2O2 or O3 at room temperature and air condition

Summary

Introduction

Manganese is one of the most earth-abundant elements and manganese oxides are generally non-toxic. Manganese oxide nanomaterials show great potential in sustainable nanotechnology They are widely utilized in catalytic reactions, sensors and batteries because of their low cost and high activity [1,2]. Mn3O4, known as hausmannite, is a mixed valence oxide and a promising candidate for catalysts, microwave absorption materials, sensors and anode materials [3]. The phenolic waste waters are highly toxic and persistent, and are difficult to treat with traditional biodegradation Strong oxidants such as H2O2 and O3, without secondary pollution, have been utilized in the treatment of organic compound waste waters. Uniform Mn3O4 nanowires are fabricated with facile hydrothermal method and common raw materials in mild conditions They are utilized to deal with phenol solution without extra H2O2 or O3 at room temperature and air condition. The mechanism of the Mn3O4 nanowires on the treatment of phenol is studied with the characterization of scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS)

Preparation and Characterization of Mn3O4

Treatment of Phenol Waste Water at Room Temperature

Composition and Morphologies of the Prepared Mn3O4

Treatment of Phenol with Mn3O4 at Room Temperature

Analyse of the Function of Mn3O4 in the Treatment of Phenol