期刊
ENVIRONMENTAL TECHNOLOGY
卷 37, 期 14, 页码 1757-1767出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2015.1131751
关键词
Triton X-45; persulfate activation; zero-valent iron nanoparticles; sulfate radicals; acute toxicity
资金
- Scientific and Technological Research Council of Turkey [111Y257, 114Y257]
- Istanbul Technical University
Aqueous Triton X-45 (TX-45; 20 mg/L; original total organic carbon (TOC) = 14 mg/L), a representative, commercially important alkylphenol polyethoxylate, was subjected to persulfate ( PS) oxidation activated with zero-valent iron (ZVI) nanoparticles. After optimization of the ZVI/PS treatment combination ( 1 g/L ZVI; 2.5 mM PS at pH5) in terms of pH (3-9), ZVI ( 0.5-5 g/L) and PS (0.5-5.0 mM) concentrations, TX-45 could be efficiently (>90%) degraded within short treatment periods (<60 min) accompanied with significant (>40%) TOC removals. The degree of PS consumption and Fe release was also followed during the experiments and a positive correlation existed between enhanced TX-45 removals and ZVI-activated PS consumption rates accompanied with a parallel Fe release. Acute toxicity tests were conducted using two different bioassays to examine the toxicological safety of the ZVI/PS oxidation system. Acute toxicity profiles significantly decreased from an original value of 66% relative inhibition to 21% and from 16% relative inhibition to non-toxic values according to Vibrio fischeri and Pseudokirchneriella subcapitata bioassays, respectively. The photobacterium V. fischeri appeared to be more sensitive to TX-45 and its degradation products than the microalgae P. subcapitata.
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