水中无机氮形态变化对酮洛芬光降解的影响

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Abstract

The impacts of different nitrogen forms (NO₃^-, NO₂^- and NH₄⁺) on the photodegradation of KET were investigated under Xe lamp irradiation. The direct photolysis solar quantum yield of KET was observed to be 0.14. Increasing the concentration of NO₃^-from 0.01mmol/L to 1.0mmol/L, the apparent rate constants of KET were decreased from 0.0109 to 0.0085. The apparent rate constants of KET decreased from 0.0095 to 0.0069when the concentration of NO₂^- increased from 0.01mmol/L to 1.0mmol/L. NH₄⁺ had no influence on KET photolysis. The screening effect of NO₃^- was the major factor on KET photolysis while NO₂^- inhibited photolysis via both attenuating light and quenching ×OH. Photodegradation of KET was also investigated under different pE values. The photodegradation rate of KET decreased at first, then it increased with the increasing pE values. The antagonistic effect existed on the photodegradation of KET when NO₂^- coexisted with NH₄⁺. And it also existed when NO₂^- coexisted with NO₃^- on the photodegradation of KET.

Key words： ketoprofen photodegradation different forms of nitrogen quantum yield pE values screening factor · OH

Received: 09 November 2015

PACS:

X703

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	Articles by authors
	DENG Wen
	LIU Guo-guang
	LV Wen-ying
	CHEN Ping
	WANG Feng-liang
	PAN Xia-ling
	ZHANG Li-peng
	MA Jing-shuai
	LIN Xiao-xuan

Cite this article:

DENG Wen,LIU Guo-guang,LV Wen-ying等. Photodegradation of ketoprofen in aquatic environment: Effect of different forms of nitrogen[J]. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(5): 1456-1462.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I5/1456

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