Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 239, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2020.116561
Keywords
CoO nanoparticles; NaHSO3 activation; Chemical catalysis; Dye degradation
Categories
Funding
- National Natural, Science Foundation of China [20968005]
- Qing Lan Project of Jiangsu Province
- 333 Project of Jiangsu Province
- High Levels of Innovation Team and Excellence Scholars Program in Colleges of Guangxi
- Opening Project of Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control [KF201812-4]
- College of Agricultural Sciences [PEN04705]
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A novel catalytic system was developed by activating NaHSO3 with CoO nanoparticles for methylene blue (MB) degradation. The CoO nanoparticles were synthesized by a facile one-pot hydrothermal method followed by calcination. The crystallinity, morphology and elemental valence of the CoO were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS), respectively. MB degradation rates of 91.5% in one minute and 99.4% in six minutes were obtained using the CoO/NaHSO3 system, which may provide a more cost-effective and efficient way for decomposition of dye pollutants. The well-known classical quenching tests were used to investigate the free radicals involved in MB degradation along with electron paramagnetic resonance (EPR) spectra, the latter further confirmed the types of free radicals. Sulfate and hydroxyl radicals were proposed to be responsible for the excellent dye degradation achieved with the new CoO/NaHSO3 system.
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