Heterogeneous UV/Fenton degradation of TBBPA catalyzed by titanomagnetite: catalyst characterization, performance and degradation products.
Tetrabromobisphenol A (TBBPA), a widely used brominated flame retardant, could negatively affect various aspects of mammalian and human physiology, which triggers effective techniques for its removal. In this work, the degradation characteristics of TBBPA in heterogeneous UV/Fenton reaction catalyzed by titanomagnetite (Fe(3-x)Ti(x)O₄) were studied. Batch tests were conducted to evaluate the effects of titanomagnetite dosage, H₂O₂ concentration and titanium content in magnetite on TBBPA degradation. In the system with 0.125 g L⁻¹ of Fe₂.₀₂Ti₀.₉₈O₄ and 10 mmol L⁻¹) of H₂O₂, almost complete degradation of TBBPA (20 mg L⁻¹) was accomplished within 240 min UV irradiation at pH 6.5. The titanium incorporation obviously enhanced the catalytic activity of magnetite. As shown by the XRD and XANES results, titanomagnetite had a spinel structure with Ti⁴⁺ occupying the octahedral sites. On the basis of the degradation products identified by GC-MS, the degradation pathways of TBBPA were proposed. TBBPA possibly underwent the sequential debromination to form TriBBPA, DiBBPA, MonoBBPA and BPA, and β-scission to generate seven brominated compounds. All of these products were finally completely removed from reaction solution. In addition, the reused catalyst Fe₂.₀₂Ti₀.₉₈O₄ still retained the catalytic activity after three cycles, indicating that titanomagnetite had good stability and reusability. These results demonstrated that heterogeneous UV/Fenton reaction catalyzed by titanomagnetite is a promising advanced oxidation technology for the treatment of wastewater containing TBBPA.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 511 Kehua Street, Guangzhou 510640, China.
Yuanhong
Y
Zhong
Xiaoliang
X
Liang
Yin
Y
Zhong
Jianxi
J
Zhu
Sanyuan
S
Zhu
Peng
P
Yuan
Hongping
H
He
Jing
J
Zhang
D002384:Catalysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D011075:Polybrominated Biphenyls / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014961:X-Ray Diffraction
D011075:Polybrominated Biphenyls; D014025:Titanium; C020806:tetrabromobisphenol A; D052203:Ferrosoferric Oxide