期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 299, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120663
关键词
Excess sludge; Hydrothermal treatment; Hydrochar; PDS; Atrazine
资金
- National Natural Science Foundation of China [51878136, 51878135, 52070040, 51878137]
- Shanghai Rising-Star Program [19QC1400300, 20QA1400400]
- National Key R & D Program of China [2019YFD1100502]
- Fundamental Research Funds for the Central Universities
- DHU Distinguished Young Professor Program
- Shanghai Engineering Research Center of Biotransformation of Organic Solid Waste [SERC2021C07]
The study found that sludge-derived hydrochar and pyrochar have different effects on atrazine removal under PDS activation. Hydrochar has a more significant enhancement on ATZ removal in the PDS system compared to pyrochar. This is because humic substances in HC play a crucial role in ATZ degradation, providing more O-1(2).
Sludge-derived hydrochar (HC) and pyrochar (PC) by hydrothermal and pyrolytic treatments were compared their peroxydisulfate (PDS) activation capacities toward atrazine (ATZ) removal. The HC alone induced lower ATZ removal than PC alone. However, ATZ removal was significantly enhanced in HC/PDS system rather than in PC/PDS system. ATZ removal via adsorption was very low, and singlet oxygen (O-1(2)) primarily contributed to its removal, independently on the PDS addition. Compared to HC, PC possessed stronger electron transfer capacity, exhibiting a higher ATZ removal. After PDS addition, humic substances (HS) in HC (36.3 +/- 2.4 mg/g) played a decisive role in enhanced ATZ degradation: PDS excited HS to a triplet state ((HS)-H-3*); then, PDS and (HS)-H-3* together yielded more O-1(2). Meanwhile, (HS)-H-3* accelerated electron transfer on HC surface. Thus, more electrons were transferred from AZT to O-1(2). However, function of small amount of HS in PC (1.5 +/- 0.2 mg/g) could be ignored.
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