卤素离子对溶解性黑碳光化学活性的影响

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Abstract Dissolved black carbon (DBC) is regarded as an important part of natural organic matter, however, its photochemical activity in the estuary is not clear. Here, the soybean straw DBC as the target, the changes in the formation rate (F_T), the loss rate constants (k_s’), and the steady-state concentrations ([T]_ss) of ³DBC^* in the presence of halogen ions in the estuary was explored by energy transfer isomerization of sorbic acid. The effects of halogen ions on ³DBC^* electron transfer were studied by 2,4,6-trimethylphenol method. The results showed that halogen ions and ionic strength did not affect F_T, but k_s’ was decreased due to ionic strength and heavy atom effect of Br^-, which increased [T]_ss. The photochemical experiment of high concentration DBC confirmed that the ionic strength effect caused the aggregation of DBC molecules, which weakened the charge transfer of ³DBC^* and inhibited the quenching of ³DBC^*. For energy transfer of ³DBC^*, it was not directly affected by halogen ions and ionic strength, but by the increase of [T]_ss. Moreover, it was further found that halogen ions and ionic strength had no significant effect on the low-energy (E_T < 250kJ/mol) ³DBC^*, but only on high-energy ³DBC^*and became obviously with the increase of the concentrations of halogen ions and ionic strength.

Key words： dissolved black carbon estuarine water photochemistry ionic strength halogen ions energy transfer electron transfer

Received: 10 December 2021

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X522

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	Articles by authors
	TU Yi-na
	TANG Wei
	MA Yan-qiong
	ZHANG Zhi-yu
	TIAN Sen-lin
	LI Ying-jie

Cite this article:

TU Yi-na,TANG Wei,MA Yan-qiong等. Effect of halogen ions on photochemical activity of dissolved black carbon[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3362-3369.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3362

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