Degradation efficiencies of 2,4,6-TCP by Fe.sup.0-based advanced oxidation processes

Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by zero-valent iron (ZVI) activating three common peroxides (peroxymonosulfate (PMS), hydrogen peroxide (H.sub.2 O.sub.2 ), and peroxydisulfate (PS)) was investigated. The effects of ZVI dosage, peroxides concentration, initial pH, and Cl.sup.- concen...

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Published in:PloS one Vol. 16; no. 9; p. e0257415
Main Authors: Ai, Luoyan, Ren, Tiancheng, Yan, Qin, Wan, Mengdan, Peng, Yajuan, Xu, Xiaoyun, Liu, Xinxin
Format: Journal Article
Language:English
Published: Public Library of Science 22.09.2021
Subjects:
Analysis
Chlorophenols
Peroxides
Properties
Transmission Control Protocol/Internet Protocol (Computer network protocol)
China
ISSN:1932-6203, 1932-6203
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Abstract Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by zero-valent iron (ZVI) activating three common peroxides (peroxymonosulfate (PMS), hydrogen peroxide (H.sub.2 O.sub.2 ), and peroxydisulfate (PS)) was investigated. The effects of ZVI dosage, peroxides concentration, initial pH, and Cl.sup.- concentration were examined. The 2,4,6-TCP degradation efficiencies by Fe.sup.0 /peroxides (PMS, H.sub.2 O.sub.2, PS) were compared. Results showed that the order for degradation efficiency was H.sub.2 O.sub.2 [greater than or equal to]PMS>PS. The degradation efficiency of 2,4,6-TCP in ZVI/peroxides systems were optimal at c(Ox) = 1 mmol*L.sup.-1 ; c(Fe.sup.0) = 0.1 g/L; initial pH = 3.2. Additionally, pH had a vital effect on 2,4,6-TCP degradation. At pH<3.2, ferrous play a vital role in all reaction, and accelerate the reaction rate rapidly. The existence of NaCl showed different results in the four systems. Chloride had little effect on 2,4,6-TCP degradation when chloride concentration at 5 mM, whereas the presence of 300 mM chloride significantly accelerated the degradation of 2,4,6-TCP from 72.7% to 95.2% in ZVI-PMS system. Notably, the other three systems showed opposite results. In contrast, the AOX (Absorbable Organic Halogen) values were highest in ZVI-PMS-Cl.sup.- system, due to the formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are good for choosing the most suitable technology for chlorophenol wastewater treatment.
AbstractList Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by zero-valent iron (ZVI) activating three common peroxides (peroxymonosulfate (PMS), hydrogen peroxide (H.sub.2 O.sub.2 ), and peroxydisulfate (PS)) was investigated. The effects of ZVI dosage, peroxides concentration, initial pH, and Cl.sup.- concentration were examined. The 2,4,6-TCP degradation efficiencies by Fe.sup.0 /peroxides (PMS, H.sub.2 O.sub.2, PS) were compared. Results showed that the order for degradation efficiency was H.sub.2 O.sub.2 [greater than or equal to]PMS>PS. The degradation efficiency of 2,4,6-TCP in ZVI/peroxides systems were optimal at c(Ox) = 1 mmol*L.sup.-1 ; c(Fe.sup.0) = 0.1 g/L; initial pH = 3.2. Additionally, pH had a vital effect on 2,4,6-TCP degradation. At pH<3.2, ferrous play a vital role in all reaction, and accelerate the reaction rate rapidly. The existence of NaCl showed different results in the four systems. Chloride had little effect on 2,4,6-TCP degradation when chloride concentration at 5 mM, whereas the presence of 300 mM chloride significantly accelerated the degradation of 2,4,6-TCP from 72.7% to 95.2% in ZVI-PMS system. Notably, the other three systems showed opposite results. In contrast, the AOX (Absorbable Organic Halogen) values were highest in ZVI-PMS-Cl.sup.- system, due to the formation of lots of refractory chlorinated phenols as identified by GC-MS. These findings are good for choosing the most suitable technology for chlorophenol wastewater treatment.
Audience Academic
Author Liu, Xinxin
Xu, Xiaoyun
Yan, Qin
Peng, Yajuan
Ai, Luoyan
Ren, Tiancheng
Wan, Mengdan
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Snippet Degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by zero-valent iron (ZVI) activating three common peroxides (peroxymonosulfate (PMS), hydrogen peroxide...
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SubjectTerms Analysis
Chlorophenols
Peroxides
Properties
Transmission Control Protocol/Internet Protocol (Computer network protocol)
Title Degradation efficiencies of 2,4,6-TCP by Fe.sup.0-based advanced oxidation processes
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