环境因子对胡敏酸介导下SDZ光解行为的影响

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Abstract

This experiment studied the influence of some environmental factors, including various concentration of sulfadiazine (SDZ), paddy soil humic acid (SDHA), and peat soil humic acid (NTHA), different pH values, photosensitive ions (NO₃^- and Fe³⁺), ionic strength, and metal ions (Ca²⁺, Mg²⁺ and K⁺) on the photodegradation of SDZ in pure water and two separate sources of HA solution. The results showed that under the condition of pH=7.1, the photodegradation of SDZ has been promoted in both systems and had the best effect. The photolysis rate of SDZ was speeded up under the condition of low SDZ (2mg/L) and low HA concentration (15mg/L). Photosensitive ions NO₃^- promoted the photolysis of SDZ in pure water by light producing·OH, but in HA systems, HA could inhibit OH and cause the photolysis rate of SDZ to be lower than that in pure water; Fe³⁺ exhibited inhibition in HA systems, and the intensity was NTHA>SDHA. The photolysis rate of SDZ in pure water increased when the concentrations of NaCl became higher, under HA systems, the inhibition effect was stronger under the lower concentration of NaCl (C_NaCl=50mmol/L). The metal ions (K⁺, Ca²⁺, and Mg²⁺) in pure water had a weak inhibition effect on the photolysis of SDZ, but K⁺ clearly showed inhibition in HA systems. The inhibition intensity was K⁺ > Ca²⁺ > Mg²⁺. The effect of monovalent cation on SDZ photodegradation was more significant.

Key words： sulfadiazine photodegradation environmental factors humic acid

Received: 08 May 2019

PACS:

X703

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	Articles by authors
	LIU Chang
	WANG Bin
	ZENG Dan
	CHEN Shu
	SHEN Xia
	HUANG Sha

Cite this article:

LIU Chang,WANG Bin,ZENG Dan等. Environmental factors of influencing the photodegradation ofsulfadiazine by humic acid mediated system[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(12): 5134-5144.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I12/5134

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