Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, China.
Sci Total Environ. 2020 Apr 1;711:134539. doi: 10.1016/j.scitotenv.2019.134539. Epub 2019 Nov 29.
In the present study, the UVC-assisted electrochemical degradation ofthree novel bisphenol analogues (BPs; including bisphenol F, S, and B, i.e., BPF, BPS and BPB, respectively), along with bisphenol A (BPA), was investigated using boron-doped diamond (BDD) electrode. At first, this study demonstrated a significant influence ofcurrent density on the degradation rates of BPF by the BDD anode. The pseudo-first order rate constants for BPF were calculated as 0.012, 0.028 and 0.029 min at the applied current densities of 10, 20 and 30 mA/cm, respectively. UVC irradiation significantly enhanced the electrochemical degradation of BPF in the concentration range from 5 to 30 mg/L, with synergistic effects in the range of 32.0%-40.9%. The UVC-BDD electrolysisshowed comparable or even lower electric energy per order (E) than single BDD electrolysis. The UVC-assisted degradation of the investigated BPs showed decreased pseudo-first order rate constants in the following order: BPF > BPA > BPB > BPS. Based on the identifiedtransformation products, UVC-assisted electrochemical degradation pathways of the novel BPs were proposed to be mainly hydroxylation and bond-cleavage. UVC irradiation has been proved to promote the formation of hydroxyl radicals by BDD electrode to facilitate the degradation process. For these BPs, nearly 100% mineralization can be achieved by a modified strategy using a short-time UVC-assisted BDD electrolysis (120 min) that is followed by UVC photolysis (360 min). Finally, the eco-toxicity of the BPs solutions towardsVibrio Fischeri was significantly removed after 120 min of the electrochemical degradation period. Based on these results, the UVC-assisted electrochemical treatment using a BDD electrode can be considered a promising technology for the removal of novel BPs and the reduction of their hazardous effects to aqueous environments.
在本研究中，使用掺硼金刚石（BDD）电极，研究了 UVC 辅助电化学降解三种新型双酚类似物（BPs；包括双酚 F、S 和 B，即 BPF、BPS 和 BPB）以及双酚 A（BPA）的情况。首先，本研究表明电流密度对 BPF 在 BDD 阳极上的降解速率有显著影响。在施加电流密度为 10、20 和 30 mA/cm 时，BPF 的拟一级速率常数分别为 0.012、0.028 和 0.029 min。UVC 辐射显著增强了 BPF 在 5 至 30 mg/L 浓度范围内的电化学降解，协同效应范围为 32.0%-40.9%。UVC-BDD 电解除了在一些情况下比单独 BDD 电解具有更低的电能每阶（E）外，显示出可比甚至更低的 E 值。所研究的 BPs 的 UVC 辅助降解显示出降低的拟一级速率常数，顺序为：BPF>BPA>BPB>BPS。根据鉴定的转化产物，提出了新型 BPs 的 UVC 辅助电化学降解途径主要为羟化和键断裂。已经证明 UVC 辐射通过 BDD 电极促进了羟基自由基的形成，从而促进了降解过程。对于这些 BPs，可以通过一种修改策略实现近 100%的矿化，该策略使用短时间的 UVC 辅助 BDD 电解（120 min），然后进行 UVC 光解（360 min）。最后，电化学降解 120 min 后，BP 溶液对发光菌的生态毒性显著降低。基于这些结果，使用 BDD 电极的 UVC 辅助电化学处理可以被认为是一种有前途的技术，用于去除新型 BPs 并减少其对水环境污染的有害影响。
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