电子顺磁共振
吸附
兴奋剂
催化作用
化学
过硫酸盐
氮气
碳纤维
退火(玻璃)
降级(电信)
化学工程
材料科学
光化学
有机化学
复合材料
电信
物理
光电子学
核磁共振
复合数
计算机科学
工程类
作者
Dong Cheng,Dezhi Yang,Ying Pan,Yuansen Tan,Runhao Ma,Bo Chen,Feng He
标识
DOI:10.1016/j.scitotenv.2023.168679
摘要
In this study, a dicyandiamide residue-derived carbon material (DWC-800) was fabricated through a two-step process involving ball-milling nitrogen (N) doping and high-temperature annealing, and then utilized for peroxodisulfate (PDS) activation in the removal of 2,4-dichlorophenol (2,4-DCP). The obtained DWC-800, with very low N content (0.52 at.%), exhibited highly efficient PDS activation, resulting in complete removal of 2,4-DCP in 60 min. This performance was superior to that of the material with high N content (15.4 at.%), which was prepared using only one-step ball-milling N doping. The N-doped process increased the defective degree of carbocatalyst, and these reactive carbon defects rather than N species greatly improved the adsorption and catalytic activity. The results of quenching experiments and electron paramagnetic resonance demonstrated that PDS activation by DWC-800 for 2,4-DCP degradation followed a nonradical pathway, leading to the production of both singlet oxygen (1O2) and carbon-PDS* complex. Notably, electron transfer mediated by the carbon-PDS* complex played a significant role in the degradation of 2,4-DCP. Overall, this study gets new insights into the role of N doping in mediating the structural properties of the carbocatalyst and its catalytic performance, and provides a theoretical basis for the utilization of dicyandiamide waste residue for wastewater remediation.
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