An intrinsic N, P self-standing carbon block (NP SSCB) cathode prepared with Chlorella as a precursor was used to enhance the electro-peroxone (EP) process under acidic conditions through a temperature modulation strategy. The results exhibited that NP SSCB-800-EP had a synergistic effect on levofloxacin (LEV) degradation by 42.1% and produced in situ H2O2 up to 70 mg L−1. Quenching and EPR tests confirmed that ·OH, HO2·/O2·- and 1O2 were responsible for degradation of LEV. The quantitative results showed that EP process produced radicals in the order of 1O2> HO2·/O2·->·OH. X-ray photoelectron spectroscopy (XPS) and density functional theory (DFT) calculations under acidic conditions confirmed that pyridinic N, pyrrolic N, C-O-P and the defects were active sites for in-situ H2O2 production. Furthermore, pyridinic N, pyrrolic N and C-P-O groups contributed to the reaction of H2O2 with O3 to form HO2/O2·- and O3·- intermediates, free from overcoming the limitations associated with traditional HO2− production. Graphitic N and C3-PO were possible active sites for triggering the 1O2 and *Oad production. This work provides a new strategy for the preparation of self-standing carbon-based cathodes and achieves multiple functions of EP process under acidic conditions, presenting new insights into structure-functional relationships in carbon-based advanced oxidation processes.

中文翻译：

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左氧氟沙星在电过氧化物系统中与来自小球藻的增强型原位 N、P 自立式碳阴极的协同氧化：原位 H2O2 生成、过氧酮活化和催化臭氧化


以小球藻为前驱体制备的本征 N，P 自立式碳块 （NP SSCB） 阴极用于通过温度调制策略在酸性条件下增强电过氧化物 （EP） 过程。结果表明，NP SSCB-800-EP 对左氧氟沙星 （LEV） 降解具有 42.1% 的协同作用，并原位产生高达 70 mg L-1 的 H 2 O 2。淬火和 EPR 测试证实 ·OH、HO2·/O2·- 和 1O2 是 LEV 降解的原因。定量结果表明，EP 工艺产生的自由基数量级为 1O2> HO2·/O2·->·哦。酸性条件下的 X 射线光电子能谱 （XPS） 和密度泛函理论 （DFT） 计算证实，吡啶 N、吡咯 N、C-O-P 和缺陷是原位产生 H2O2 的活性位点。此外，吡啶 N、吡咯 N 和 C-P-O 基团有助于 H2O2 与 O3 反应形成 HO2/O2·- 和 O3·- 中间体，而没有克服与传统 HO2− 生产相关的限制。石墨 N 和 C3-PO 是触发 1O2 和 *Oad 产生的可能活性位点。这项工作为制备自立式碳基阴极提供了一种新策略，并在酸性条件下实现了 EP 过程的多种功能，为碳基高级氧化过程中的结构-功能关系提供了新的见解。