Heterogeneous UV/Fenton degradation of TBBPA catalyzed by titanomagnetite: catalyst characterization, performance and degradation products.
Heterogeneous UV/Fenton degradation of TBBPA catalyzed by titanomagnetite: catalyst characterization, performance and degradation products.
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DOI：
10.1016/j.watres.2012.06.025
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发表时间：
2012-10
期刊：
影响因子：
12.8
通讯作者：
Yuanhong Zhong;Xiaoliang Liang;Y. Zhong;Jianxi Zhu;Sanyuan Zhu;P. Yuan;Hongping He;Jing Zhang
中科院分区：
文献类型：
--
作者：
Yuanhong Zhong;Xiaoliang Liang;Y. Zhong;Jianxi Zhu;Sanyuan Zhu;P. Yuan;Hongping He;Jing Zhang
四溴双酚A（TBBPA）是一种广泛使用的溴化阻燃剂，可对哺乳动物和人类生理的各个方面产生负面影响，这引发了有效的去除技术。研究了钛磁铁矿（Fe 3 − xTixO 4）催化的非均相UV/芬顿反应对四溴双酚A（TBBPA）的降解特性。通过批式试验考察了钛磁铁矿投加量、H2 O2浓度和磁铁矿中钛含量对TBBPA降解的影响。在含有0.125 g L− 1 Fe2.02Ti0.98 O 4和10 mmol L− 1 H2 O2的体系中，在pH 6.5下，在240 min UV照射内完成了TBBPA（20 mg L−1）的几乎完全降解。钛的掺入明显提高了磁铁矿的催化活性。XRD和XANES结果表明，钛磁铁矿具有尖晶石结构，Ti 4+占据八面体位置。在GC-MS分析降解产物的基础上，提出了TBBPA的降解途径。TBBPA可能依次发生脱溴反应生成TriBBPA、DiBBPA、MonoBBPA和BPA，并发生β-断裂反应生成7种溴代化合物。最终将所有这些产物从反应溶液中完全除去。此外，重复使用的催化剂Fe 2. 02 Ti 0. 98 O 4在3次循环后仍保持催化活性，表明钛磁铁矿具有良好的稳定性和重复使用性。这些结果表明，钛磁铁矿催化的非均相UV/芬顿反应是一种很有前途的处理含TBBPA废水的高级氧化技术。
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 (Fe3−xTixO4) were studied. Batch tests were conducted to evaluate the effects of titanomagnetite dosage, H2O2concentration and titanium content in magnetite on TBBPA degradation. In the system with 0.125 g L−1of Fe2.02Ti0.98O4and 10 mmol L−1of 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 Fe2.02Ti0.98O4still 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.