Zhang Guangshan, Wang Qiao, Zhang Wen, Li Tian, Yuan Yixing, Wang Peng
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China.
Photochem Photobiol Sci. 2016 Aug 4;15(8):1046-53. doi: 10.1039/c6pp00051g. Epub 2016 Jul 20.
This work investigated the effects of organic acids and initial solution pH on the photodegradation of BPA in a photo-Fenton-like process using α-FeOOH as a catalyst. The results showed that the addition of different organic acids affected the formation of the ferric-carboxylate complexes and free radicals, which in turn varied the photodegradation efficacy. Compared with the other acids, oxalic acid (OA) was found to be the most effective in enhancing the photodegradation of BPA, which strongly depends on the OA concentration. Particularly, the addition of OA could significantly extend the working pH from an acidic to a neutral range for the photocatalytic process and thus the acidification pretreatment may not be needed. A high photocatalytic degradation of BPA occurred at pH 6.0, due to the formation of ferric-oxalate complexes and ˙OH radicals in the synergistic interactions of OA and α-FeOOH. This finding highlights that the oxalate-promoted photo-Fenton-like process using the α-FeOOH catalyst may be used for wastewater treatment without pH adjustment.
本研究以α-FeOOH为催化剂，在类光芬顿过程中考察了有机酸和初始溶液pH值对双酚A（BPA）光降解的影响。结果表明，添加不同的有机酸会影响铁-羧酸盐配合物和自由基的形成，进而改变光降解效果。与其他酸相比，草酸（OA）被发现对增强BPA的光降解最有效，这在很大程度上取决于OA的浓度。特别是，添加OA可以显著将光催化过程的工作pH值从酸性范围扩展到中性范围，因此可能不需要进行酸化预处理。在pH 6.0时，由于OA和α-FeOOH的协同作用形成了铁-草酸盐配合物和˙OH自由基，BPA发生了高光催化降解。这一发现突出表明，使用α-FeOOH催化剂的草酸盐促进类光芬顿过程可用于无需调节pH值的废水处理。
