Yan Kai, Li Ruiqi, Yang Zhiyu, Li Xin, Wang Yuchen, Wu Guosheng
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
Instrumentation Lab, Lakehead University, Thunder Bay, ON P7B5E1, Canada.
iScience. 2021 Apr 12;24(5):102421. doi: 10.1016/j.isci.2021.102421. eCollection 2021 May 21.
The simultaneous removal of mixed containments of antibiotics and heavy metals is still a big challenge in wastewater treatment. Herein, we report the successful synthesis of N-doped porous carbon (abbreviated as NC) from straw waste through the Maillard reaction to activate sp-sp conversion efficient for the simultaneous removal of chlortetracycline (CTC) and hexavalent chromium (Cr(VI)). In 200 min, 96.9% of Cr(VI) was reduced into Cr(III) and 93.1% of CTC was oxidatively degraded. Reactive substances (e.g., h, e, ⋅OH, and ⋅O ) were verified for the photocatalytic reactions. Besides, the possible degradation intermediates of CTC were analyzed with ultra performance liquid chromatography-mass spectrometry (UPLC-MS/MS), and the mechanism of photocatalytic degradation of CTC was then proposed. The synthesized bifunctional NC materials could also be applied for the similar system; this will open the door for promising practical applications.
在废水处理中，同时去除抗生素和重金属的混合污染物仍然是一个巨大的挑战。在此，我们报告了通过美拉德反应成功地从秸秆废料合成了氮掺杂多孔碳（简称为NC），以激活sp-sp转化，从而高效地同时去除金霉素（CTC）和六价铬（Cr(VI)）。在200分钟内，96.9%的Cr(VI)被还原为Cr(III)，93.1%的CTC被氧化降解。验证了活性物质（如h、e、·OH和·O）参与光催化反应。此外，用超高效液相色谱-质谱联用仪（UPLC-MS/MS）分析了CTC可能的降解中间体，进而提出了CTC光催化降解的机理。合成的双功能NC材料也可应用于类似体系；这将为有前景的实际应用打开大门。
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