Assessing the effect on the generation of environmentally persistent free radicals in hydrothermal carbonization of sewage sludge
Assessing the effect on the generation of environmentally persistent free radicals in hydrothermal carbonization of sewage sludge
复制标题
评估污水污泥水热碳化对环境持久性自由基产生的影响
DOI：
10.1038/s41598-019-53781-3
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发表时间：
2019-11
影响因子：
4.6
通讯作者：
Zhang Jing
中科院分区：
文献类型：
--
作者：
Zhu Yuhan;Wei Jia;Liu Yitao;Liu Xiaohui;Li Jun;Zhang Jing
环境持久性自由基(EPFR)近年来引起了人们越来越多的研究兴趣。本文对污水污泥水热碳化过程中EPFR的生成进行了研究。首先，对SS的表面形态、官能团、组成元素和自由基进行了表征，对粗制SS和水热炭化制得的加氢焦(SHC)进行了整体描述。然后，通过对SHC中EPFR的G因子和强度的研究，详细探讨了水热温度、停留时间和初始pH对EPFR形成的影响。结果表明，EPFR的形成受上述因素的影响，其中温度的影响最大。在加氢焦中发现了两种EPFR，即氧中心(O中心)和碳中心(C中心)EPFR，它们分别在12 0~15 0 °C和2 6 0~2 80 °C捕获。此外，随着水热温度的升高，电子顺磁共振(EPR)信号的强度增强。而停留时间和初始pH只在一定程度上影响EPFR的量。此外，O中心EPFR和C中心EPFR的半衰期分别长达160.45天和401.10天，表明EPFR在较长的时间内是稳定的。
Environmentally persistent free radicals (EPFRs) have attracted increasing research interest in recent years. Herein, the generation of EPFRs during the hydrothermal carbonization of sewage sludge (SS) was studied. First, the surface morphology, functional groups, constituent elements and free radicals were characterized for a holistic description of the raw SS and the selected hydrochar obtained from hydrothermal carbonization of SS (SHC). Then, the impact of hydrothermal temperature, residence time and initial pH on the formation of EPFRs was explored in detail through the investigation ofg-factors and intensities of EPFRs identified in SHC. The results have shown that the formation of EPFRs was affected by the factors mentioned above, in which the impact of temperature is the greatest. Two types of EPFRs were spotted in the hydrochar, oxygen-centered (O-centered) and carbon-centered (C-centered) EPFRs, which were caught in 120–150 °C and 260–280 °C, respectively. Moreover, the intensities of Electron Paramagnetic Resonance (EPR) signals enhanced with increasing hydrothermal temperature. Whereas, residence time and initial pH only affected the amount of EPFRs in a manner. Additionally, the half-life of the O-centered EPFRs and the C-centered EPFRs was determined as long as 160.45 days and 401.10 days, respectively, indicating that EPFRs are stable in a long time.
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影响因子：
11.4
作者：
Kibet, J.;Khachatryan, L.;Dellinger, B.
通讯作者：
Dellinger, B.
影响因子：
11.4
作者：
Vejerano, Eric;Lomnicki, Slawomir M.;Dellinger, Barry
通讯作者：
Dellinger, Barry
影响因子：
10.4
作者：
Demirbas, A
通讯作者：
Demirbas, A
改性蒙脱土上多环芳烃的转化和环境持久性自由基的形成：表面金属离子和多环芳烃分子性质的作用
影响因子：
11.4
作者：
Jia, Hanzhong;Zhao, Song;Sharma, Virender K.
通讯作者：
Sharma, Virender K.
DOI：
10.1016/j.saa.2007.09.024
发表时间：
2008-05-01
影响因子：
4.4
作者：
Jezierski, Adam;Skrzypek, Grzegorz;Jedrysek, Mariusz O.
通讯作者：
Jedrysek, Mariusz O.