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N-doped biochar from sewage sludge for catalytic peroxydisulfate activation toward sulfadiazine: Efficiency, mechanism, and stability
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-06-22 , DOI: 10.1016/j.jhazmat.2021.126446
Xiangyang Pei 1 , Xingxing Peng 2 , Xiaoshan Jia 2 , Po Keung Wong 3
Affiliation  

Sewage sludge-derived biochar (SBC) could remove organic contaminants in environment and reuse the sludge effectively. In this study, urea-doped SBC (NSBC) was prepared, characterized, and applied as heterogeneous catalytics to peroxydisulfate (PDS) activation. Sulfadiazine (SD), a widely used antibiotic, was used as a model pollutant to evaluate the efficiency and mechanism of this system. The degradation rate of SD increased to 100% after 4 h when 1 g/L of NSBC was added to the system with a SD concentration of 20 mg/L. In this study, it was confirmed that there were two important pathways in the degradation of SD by NSBC/PDS system: the free radical on the surface of NSBC and the nonradical (1O2) in the solution. The doping of N atoms makes neighboring C atoms positively charged, thereby making the direct transfer of electrons with S2O82− and the generation of 1O2 via nonradical pathway easy. In addition, the Cdouble bondO functional group formed during the pyrolysis of NSBC can produce 1O2 in a similar way. A total of 22 SD degradation products were identified, and 4 possible pathways were proposed. This study provide supplement for the degradation mechanism of organic compounds by carbon-based materials.



中文翻译:

来自污水污泥的 N 掺杂生物炭用于催化过二硫酸盐活化为磺胺嘧啶:效率、机理和稳定性

污水污泥衍生生物炭(SBC)可以去除环境中的有机污染物并有效地再利用污泥。在这项研究中,尿素掺杂的 SBC (NSBC) 被制备、表征并作为非均相催化剂应用于过二硫酸盐 (PDS) 活化。磺胺嘧啶 (SD) 是一种广泛使用的抗生素,被用作模型污染物来评估该系统的效率和机制。在体系中加入 1 g/L NSBC,SD 浓度为 20 mg/L 时,4 h 后 SD 的降解率提高到 100%。本研究证实NSBC/PDS体系降解SD有两条重要途径:NSBC表面的自由基和非自由基( 1 O 2) 在解决方案中。N 原子的掺杂使相邻的 C 原子带正电,从而使电子与 S 2 O 8 2-的直接转移以及通过非自由基途径产生1 O 2变得容易。此外,双键NSBC 热解过程中形成的 CO 官能团可以以类似的方式产生1 O 2。共鉴定出 22 种 SD 降解产物,并提出了 4 条可能的途径。该研究为碳基材料降解有机化合物的机理提供了补充。

更新日期:2021-06-28
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