UV-LED/NaClO工艺对水中对乙酰氨基酚的降解

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Abstract The degradation of acetaminophen (AAP) in aqueous solution by NaClO, UV-LED and UV-LED/NaClO was investigated, the influences of several factors such as NaClO dosage, pH values and humic acid (HA) on AAP degradation by UV-LED/NaClO process were discussed. Contributions of hydroxyl radical (OH·), UV-LED irradiation, NaClO and free chlorine radical RCS(Cl, Cl₂^·-, ClO·) AAP degradation also studied. Variation of acute toxicity of reacted solution was evaluated. The results indicated that AAP was removed effectively during UV-LED/NaClO process. After reaction of 90min, UV-LED irradiation, NaClO and UV-LED/NaClO processes for AAP removal were found to be 4.42%, 93.61% and 100%, respectively. The AAP degradation well fitted with the pseudo-first-order kinetics model (R²=0.9967). The removal of AAP increased with the increasing of NaClO dosage, neutral condition was conducive to AAP degradation. AAP removal was inhibited in the presence of HA. HCO₃^- and NO₃^- could slightly promote the removal of AAP. When the dosage of NaClO was 1mg/L, the relative contribution rates of OH·, UV-LED, NaClO and RCS radicals in the degradation of AAP were 0.82%, 0.66%, 33.78% and 64.74%, respectively. The UV-LED/NaClO process can decrease the acute toxicity of the solution effectively.

Key words： acetaminophen UV-LED/NaClO kinetics contribution acute toxicity

Received: 15 April 2019

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X703

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	Articles by authors
	LI Bo-qiang
	MA Xiao-yan
	LI Qing-song
	LIAO Wen-chao
	CHEN Yan-jie
	CHEN Guo-yuan
	LI Guo-xin

Cite this article:

LI Bo-qiang,MA Xiao-yan,LI Qing-song等. Degradation of acetaminophen in aqueous by UV-LED/NaClO process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(11): 4681-4688.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I11/4681

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