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作者:

Zhang, Tingting (Zhang, Tingting.) | Yang, Yanling (Yang, Yanling.) (学者:杨艳玲) | Gao, Jingfeng (Gao, Jingfeng.) (学者:高景峰) | Li, Xing (Li, Xing.) (学者:李星) | Yu, Haikuan (Yu, Haikuan.) | Wang, Nan (Wang, Nan.) | Du, Peng (Du, Peng.) | Yu, Rui (Yu, Rui.) | Li, Hang (Li, Hang.) | Fan, Xiaoyan (Fan, Xiaoyan.) (学者:樊晓燕) | Zhou, Zhiwei (Zhou, Zhiwei.) (学者:周志伟)

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摘要:

Ultrasonic (US) was used to activate persulfate (PS) in presence of nanoscale zero-valent iron (nZVI) to degrade chloramphenicol (CAP) in solution. Synergistic effects were observed of US and nZVI on PS activation (US-nZVI/PS) compared to US/PS, nZVI/PS, or US-nZVI alone, while replacement of nZVI with Fe(II) or Fe(III) ion was less efficient to degrade CAP. The US-nZVI/PS treatment exhibited a rapid and continuous oxidation of CAP in solution. Both (OH)-O-center dot and SO4 center dot- were considered to be primary reactive species responsible for CAP degradation, of which SO4 center dot- had a higher contribution than (OH)-O-center dot. Our results indicated that Fe2+ was continuously being recycled by reaction of nZVI and PS, accompanied by generation of SO4 center dot-. US accelerated the corrosion of nZVI and removed passive films on the nZVI surface. Under optimal conditions, 98.1% of CAP was degraded during 90 min. This was established in presence of 0.5 g/L nZVI and 1.0 mM PS, with an US intensity of 0.36 W/mL at 40 kHz and a pH of 7.0. When present, inorganic anions and natural organic matter partly inhibited CAP degradation, which was mainly attributed to their scavenging effects for SO4 center dot- and (OH)-O-center dot. The reusability of nZVI was examined in five consecutive cycles, showing a decrease in efficiency with each cycle. Seven major intermediate products were identified, and these indicated two degradation pathways. Finally, in-situ regeneration of CAP-saturated powdered activated carbon using US-nZVI/PS process was evaluated.

关键词:

Ultrasonic Nanoscale zero-valent iron Sulfate radical Chloramphenicol Persulfate

作者机构:

  • [ 1 ] [Zhang, Tingting]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 2 ] [Yang, Yanling]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 3 ] [Li, Xing]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 4 ] [Yu, Haikuan]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 5 ] [Wang, Nan]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 6 ] [Du, Peng]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Yu, Rui]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 8 ] [Li, Hang]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 9 ] [Fan, Xiaoyan]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 10 ] [Zhou, Zhiwei]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 11 ] [Gao, Jingfeng]Beijing Univ Technol, Natl Engn Lab Adv Municipal Wastewater Treatment, Beijing 100124, Peoples R China
  • [ 12 ] [Zhou, Zhiwei]Beijing Univ Technol, Natl Engn Lab Adv Municipal Wastewater Treatment, Beijing 100124, Peoples R China

通讯作者信息:

  • 周志伟

    [Zhou, Zhiwei]Beijing Univ Technol, 100 Xi Da Wang Rd, Beijing 100124, Peoples R China

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来源 :

SEPARATION AND PURIFICATION TECHNOLOGY

ISSN: 1383-5866

年份: 2020

卷: 240

8 . 6 0 0

JCR@2022

ESI学科: CHEMISTRY;

ESI高被引阀值:139

被引次数:

WoS核心集被引频次: 84

SCOPUS被引频次: 91

ESI高被引论文在榜: 0 展开所有

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