Journal
CHEMICAL ENGINEERING JOURNAL
Volume 384, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123245
Keywords
TiO2; g-C3N4; Persulfate; Visible-light-driven photodegradation
Categories
Funding
- National Key Research and Development Project [2016YFC0400701]
- Scientific Research Program of Shaanxi Provincial Education Department [18JS057]
- National Natural Science Foundation of China [51808434]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ5129]
- Chinese Government Hundred Talent Program of Shaanxi Provence
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A novel TiO2/g-C3N4-PS system was proposed, in which a TiO2/g-C3N4 heterojunction was used to activate persulfate (PS) to enhance pollutant photodegradation under visible-light irradiation. In this study, the TiO2/g-C3N4 photocatalyst was synthesized by a simple calcination method, and acetaminophen (AAP) was chosen as a model pollutant to test the degradation efficiency of the photocatalytic system. The TiO2/g-C3N4-PS system exhibits an efficient activity for PS activation and a high efficiency for pollutant degradation. The results show that 100 mL of a 5 mg/L AAP solution could be almost completely degraded in 30 min with 0.5 g/L photocatalyst and 2 mM PS, and TOC can be decreased by 82.5% in 60 min. After adding PS, the degradation rate of the TiO2/g-C3N4 photocatalytic system was greatly improved by nearly 13 times, compared to the TiO2/g-C3N4 system. The radical quenching experiments and electron paramagnetic resonance (EPR) results indicate that SO4 center dot-, center dot OH and H+ all contribute to eliminating organic compounds. Additionally, the TiO2/g-C3N4-PS photocatalytic system was employed to eliminate other typical micropollutants, such as phenol, bisphenol A and carbamazepine, and experiments were also carried out using real water matrices, and the ideal performance shows that the TiO2/g-C3N4-PS photocatalytic system has a strong nonselective oxidative ability for degrading contaminants.
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