Rapid Ferric Transformation by Reductive Dissolution of Schwertmannite for Highly Efficient Catalytic Degradation of Rhodamine B

Jingyu Ran,Bo Yu

doi:10.3390/ma11071165

Abstract

In this study, reductive dissolution of iron oxides was considered for the acceleration of the transformation from Fe(III) to Fe(II) to improve the degradation of rhodamine B (RhB) by potassium persulfate (PS) activation on schwertmannite. The addition of hydroxylamine (HA) showed an enhancement effect on the degradation at pH 3 and 5, but insignificant efficiency of the addition was obtained at pH 9. The surface reduction from Fe(III)-OH to Fe(II)-OH by HA was considered dominant for the acceleration of PS activation through the reductive dissolution process, and the hydroxyl and sulfate radicals generated by the decomposition of surface complexes were main primary reactive oxidants that contributed to the degradation of RhB.

Highlights

Advanced oxidation processes (AOPs) are considered efficient for the abiotic degradation of organic pollutants in water treatment due to the high oxidation activity of radicals towards organics, especially biological toxic and non-degradable organics, which are difficult to be degraded by conventional or biological oxidation methods [1]
PS or PMS activation can be achieved by transition metals [4,5,11]
It was found that the addition of HA was more for the degradation of rhodamine B (RhB) under acid It was found that the addition of HA was more for the degradation of RhB under acid conditions

Summary

Introduction

Advanced oxidation processes (AOPs) are considered efficient for the abiotic degradation of organic pollutants in water treatment due to the high oxidation activity of radicals towards organics, especially biological toxic and non-degradable organics, which are difficult to be degraded by conventional or biological oxidation methods [1]. Fe(II)/PS process shows slow transformation from Fe(III) to

Objectives

Discussion

Conclusion