Carbamazepine degradation by heterogeneous activation of peroxymonosulfate with lanthanum cobaltite perovskite: Performance, mechanism and toxicity

Huichao Guo; Xuefei Zhou; Yalei Zhang; Qiufang Yao; Yajie Qian; Huaqiang Chu; Jiabin Chen

doi:10.1016/j.jes.2020.01.003

Carbamazepine degradation by heterogeneous activation of peroxymonosulfate with lanthanum cobaltite perovskite: Performance, mechanism and toxicity

J Environ Sci (China). 2020 May:91:10-21. doi: 10.1016/j.jes.2020.01.003. Epub 2020 Jan 17.

Authors

Huichao Guo¹, Xuefei Zhou², Yalei Zhang¹, Qiufang Yao¹, Yajie Qian³, Huaqiang Chu⁴, Jiabin Chen⁵

Affiliations

¹ State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
² Key Laboratory of Yangtze River Water Environment for Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
³ College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
⁴ State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
⁵ State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China. Electronic address: chenjiabincn@163.com.

PMID: 32172958
DOI: 10.1016/j.jes.2020.01.003

Abstract

The widely used carbamazepine (CBZ) is one of the most persistent pharmaceuticals and suffers insufficient removal efficiency by conventional wastewater treatment. A synthesized Co-based perovskite (LaCoO₃) was used to activate peroxymonosulfate (PMS) in order to degrade CBZ. Results showed that LaCoO₃ exhibited an excellent performance in PMS activation and CBZ degradation at neutral pH, with low cobalt leaching. The results of FT-IR and XPS verified the high structurally and chemically stability of LaCoO₃ in PMS activation. Electron spin resonance (ESR) analysis suggested the generation of radical species, such as sulfate radicals (SO₄^-) and hydroxyl radicals (OH). Radical quenching experiments further revealed the responsibility of SO₄^- as the dominant oxidant for CBZ oxidation. Ten products were detected via the oxidation of CBZ, with the olefinic double bond attacked by SO₄^- as the initial step. Hydroxylation, hydrolysis, cyclization and dehydration were involved along the transformation of CBZ. The toxicity of CBZ solution was significantly reduced after treating by PMS/LaCoO₃.

Keywords: Carbamazepine (CBZ); Perovskite; Peroxymonosulfate (PMS); Toxicity; Transformation product.

MeSH terms

Calcium Compounds
Carbamazepine
Lanthanum*
Minerals
Oxides
Peroxides
Spectroscopy, Fourier Transform Infrared
Titanium
Water Pollutants, Chemical / analysis*

Substances

Calcium Compounds
Minerals
Oxides
Peroxides
Water Pollutants, Chemical
cobaltite
perovskite
peroxymonosulfate
Carbamazepine
Lanthanum
Titanium