Mo0 and Mo4+ bimetallic reactive sites accelerating Fe2+/Fe3+ cycling for the activation of peroxymonosulfate with significantly improved remediation of aromatic pollutants

Qiuying Yi; Wenyuan Liu; Jinlin Tan; Bo Yang; Mingyang Xing; Jinlong Zhang

doi:10.1016/j.chemosphere.2019.125539

Mo⁰ and Mo⁴⁺ bimetallic reactive sites accelerating Fe²⁺/Fe³⁺ cycling for the activation of peroxymonosulfate with significantly improved remediation of aromatic pollutants

Chemosphere. 2020 Apr:244:125539. doi: 10.1016/j.chemosphere.2019.125539. Epub 2019 Dec 3.

Authors

Qiuying Yi¹, Wenyuan Liu¹, Jinlin Tan¹, Bo Yang¹, Mingyang Xing², Jinlong Zhang³

Affiliations

¹ Key Laboratory for Advanced Materials and Institute of Fine Chemicals, National Engineering Laboratory for Industrial Wastewater Treatment, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, PR China.
² Key Laboratory for Advanced Materials and Institute of Fine Chemicals, National Engineering Laboratory for Industrial Wastewater Treatment, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, PR China. Electronic address: mingyangxing@ecust.edu.cn.
³ Key Laboratory for Advanced Materials and Institute of Fine Chemicals, National Engineering Laboratory for Industrial Wastewater Treatment, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, PR China. Electronic address: jlzhang@ecust.edu.cn.

PMID: 31835050
DOI: 10.1016/j.chemosphere.2019.125539

Abstract

In Fe²⁺/peroxymonosulfate (PMS) activation system, the slow cycle rate of Fe³⁺/Fe²⁺ has been considered to be the limiting step in the remediation of organic contaminants. In this paper, commercial molybdenum (Mo) powder is employed as the cocatalyst in Fe²⁺/PMS system, which can significantly accelerate the Fe³⁺/Fe²⁺ cycling efficiency by the exposed bimetallic active sites of Mo⁴⁺ and Mo⁰, and the process is accelerated as the amount of Mo powder increased. The Mo cocatalytic Fe²⁺/PMS system exhibits an enhanced performance for the activation of PMS and the removal of different aromatic pollutants including dyes, phenolic pollutants and antibiotics, in a wide pH range of 4.0-9.0. Importantly, Mo powder exhibits excellent cycle performance in the PMS activation system, and rhodamine B (RhB) can be removed within 10 min even after 5 cycles. Electron paramagnetic resonance (EPR) prove that the sulfate radicals (SO₄^-) is the major reactive oxides species in the PMS activation, the increase of Fe²⁺ content induced by the cocatalytic effect of Mo powder can effectively promote the production of SO₄^- and increase the utilization of PMS. In addition, to observe the process of pollutant removal more intuitively, HPLC-MS is used to analyze the decomposing pathway of RhB and sulfadiazine in Mo+FeSO₄+PMS system. It is believed that this research provides a new idea for the efficient activation of PMS by iron ions in a wide initial pH range, which is expected to be applied to the treatment of large-scale industrial wastewater.

Keywords: Degradation; Fenton-like; Iron cycle; Mo powder; Sulfamethazine.

MeSH terms

Catalytic Domain
Environmental Pollutants / chemistry*
Environmental Restoration and Remediation / methods*
Iron / chemistry
Molybdenum / chemistry*
Peroxides / chemistry*
Rhodamines
Sulfates
Wastewater

Substances

Environmental Pollutants
Peroxides
Rhodamines
Sulfates
Waste Water
sulfate radical
peroxymonosulfate
Molybdenum
Iron
rhodamine B