N and S co-doped pine needle biochar activated peroxydisulfate for antibiotic degradation
| 第一作者： |
Zhang, Hongda |
| 英文第一作者： |
Zhang, Hongda |
| 联系作者： |
Yu, Yong |
| 英文联系作者： |
Yu, Yong |
| 发表年度： |
2022 |
| 卷： |
379 |
| 摘要： |
A low-cost nitrogen and sulfur doped biochar (CNS) was prepared by oxygen limiting method using pine needles. In the CNS/PDS system, the degradation rate of tetracycline hydrochloride (TCH) reached 85.6% in 20 min when the pyrolysis temperature was 800 degrees C. X-ray photoelectron spectroscopy and Raman spectroscopy showed that high-temperature pyrolysis produced more carbonyl and defect, which enhanced the activation efficacy of CNS for PDS. Electron paramagnetic resonance and radical quenching have demonstrated that O2 center dot-and 1O2 played key roles in radical pathway. A novel mechanism for degradation of TCH by electron transfer pathway was proposed by linear sweep voltammetry and electrochemical impedance spectroscopy. CNS served as a transport mediator and the electrons of TCH were continuous transferred to PDS via CNS, which accelerated its oxidation. Moreover, density functional theory demonstrated that pyrrolic N combined with the H atom of PDS to form an N-H structure and generated a PDS-catalyst complex. The projected density of state results showed that pyrrolic N and thiophene S further speeded up the electron transfer process due to their closer proximity to 0 Fermi level. This study provides insight into the reaction mechanism of heteroatom doped biochar for treatment of organic pol-lutants in aquatic environments. |
| 刊物名称： |
Journal of Cleaner Production |
| 参与作者： |
Zhang, H. D., et al. |
吉公网安备22017302000214号
