Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 399, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.123070
Keywords
Perfluorooctanoic acid; Double layered hydrotalcites; BiOCl; Response surface; Photocatalysis
Categories
Funding
- Foundation of Key Laboratory of Yangtze River Water Environment, Ministry of Education (Tongji University), China [YRWEF201905]
- National Natural Science Foundation of China [51508327, 51778565, 51578487]
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Perfluorooctanoic acid (PFOA), a widely used compound, is harmful to the environment and human health. In this study, a facile one pot solvothermal method of integrating BiOCl with Zn-Al hydrotalcite to form spherical-shaped BiOCl/Zn-Al hydrotalcite (B-BHZA) sample is reported. The characteristics and main factors affecting photocatalytic PFOA and photocatalytic mechanism of BiOCl/Zn-Al hydrotalcite (B-BHZA) are systematically investigated. It is found that spherical-shaped B-BHZA possesses abundant defects and a larger surface area of 64.4 m(2) g(-1). The factors affecting photocatalytic removal PFOA (e.g., time, pH, initial concentration and dosage) are investigated by modeling the 3D surface response. The removal rate of PFOA is over 90 % in 6 h under UV light at an optimal pH of 2, an initial concentration of 500 mu g/L and a dose of dosage 0.5 g/L. The main mechanism occurs by photo-generated h(+) oxidation and synergistic effects from the photocatalysis process. Though investigating the intermediates of PFOA degradation and F-, a possibility was proposed that h(+) initiated the rapidly decarboxylation of PFOA. The unstable perfluoroheptyl group is formatted and further conversed to short chain perfluorocarboxylic acid. This study provides a new insight for the preparation of highly efficient photocatalysts to the treatment of halogenated compounds in UV system.
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