酸改性颗粒污泥炭催化降解左氧氟沙星机制

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Abstract Granular sludge carbon was prepared from anaerobic granular sludge. After modified with acids, the granular sludge carbons were used for the degradation of levofloxacin (LEVO) in heterogeneous Fenton-like system. The adsorption rates were all lower than 5% when using granular sludge carbons modified with inorganic acids (i.e. GSC-H₃PO₄, GSC-H₂SO₄, and GSC-HCl) and the pristine one (i.e. GSC-0), whereas the adsorption rates were approximately 20% with granular sludge (GS) and granular sludge carbon modified with oxalic acid (GSC-H₂C₂O₄). The heterogeneous Fenton-like reaction wasn't conducted until the adsorption equilibrium was achieved. The removal efficiencies of LEVO and total organic carbon (TOC) followed the order:GSC-H₃PO₄ > GSC-H₂SO₄ > GSC-HCl > GSC-H₂C₂O₄, which were all higher than those reactions with GSC-0, GS and no catalyst. The iron content on the surface of GSC-H₃PO₄ was up to 12.73%, inducing the production of more ·OH, and thus promoted the degradation of organic pollutants. The LEVO and TOC removal rates with GSC-H₃PO₄ reached 98.5% and 51.9%, respectively. After GSC-H₃PO₄ was used for five times repeatedly, the iron leaching rate was below 0.8%, and the catalyststill maintained a high catalytic efficiency. A degradation pathway of LEVO was proposed based on the results of three-dimensional fluorescence spectroscopy and intermediates identification. In addition, GSC-H₃PO₄ was effective in the treatment of hospital wastewater.

Key words： heterogeneous Fenton-like reaction granular sludge carbons levofloxacin acid modification

Received: 09 February 2021

PACS:

X703.1

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	Articles by authors
	YU Li
	LIU Yun-kang
	WEI Huang-zhao
	WANG Li
	ZHAO Ying
	WANG Sheng-zhe
	CHEN Li-li
	AN Hong-xiang

Cite this article:

YU Li,LIU Yun-kang,WEI Huang-zhao等. Mechanism of the catalytic degradation of levofloxacin by acid-modified granular sludge carbons[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4695-4702.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4695

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