富里酸（FA）对微囊藻毒素-LR（MC-LR）的光降解作用及环境影响因素分析

doi:10.16535/j.cnki.dlhyxb.2023-220

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大连海洋大学学报 ›› 2024, Vol. 39 ›› Issue (2) : 281-288. DOI: 10.16535/j.cnki.dlhyxb.2023-220

富里酸（FA）对微囊藻毒素-LR（MC-LR）的光降解作用及环境影响因素分析

汪艳昭,张静静,张达娟,戴伟,毕相东*

作者信息 +

Photodegradation of microcystin-LR (MC-LR) by fulvic acid (FA) and effect of environmental factors

WANG Yanzhao，ZHANG Jingjing，ZHANG Dajuan，DAI Wei，BI Xiangdong*

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摘要

为研究自然水环境中溶解性有机质(DOM)对微囊藻毒素-LR(MC-LR)的光降解作用，选择DOM的主要光敏活性组分富里酸(FA)作为光敏剂，在模拟太阳光照射下，对比了不同质量浓度FA(2.5、5.0、7.5、10.0 mg/L)溶液中MC-LR的光降解规律和光降解产物，并探究了不同pH、光照度对FA光降解MC-LR的影响。结果表明：MC-LR能在去离子水中发生直接光降解反应，不同质量浓度的FA对MC-LR的光降解均有促进作用，其中，7.5 mg/L FA对MC-LR的光降解作用最强，180 min时降解率达52.65%；FA对MC-LR的光降解过程符合二级反应动力学方程，其光降解产物与在去离子水中直接光降解的产物相同；不同pH和光照度下，FA对MC-LR的光降解作用依次为pH 6>pH 7>pH 8>pH 9，39.8 μmol/(s·m2)>56.9 μmol/(s·m2)>22.8 μmol/(s·m2)。研究表明，pH和光照度均会影响FA对MC-LR的光降解作用，其中，pH为6、光照度为39.8 μmol/(s·m2)时，FA对MC-LR光降解作用最强。

Abstract

To investigate the photodegradation of microcystin-LR (MC-LR) by dissolved organic matter (DOM) in natural aquatic environments, the photolysis patterns and products of MC-LR in the main photosensitizer of DOM fulvic acid (FA) solutions with different concentrations of 2.5, 5.0, 7.5 and 10.0 mg/L were compared under simulated solar irradiation, and the effects of different pH values and light intensities on FA photodegradation of MC-LR were investigated. The results showed that the direct photolysis of MC-LR was found in deionized water. Different concentrations of FA led to promote the photolysis of MC-LR, with the best photodegradation at 7.5 mg/L of FA. There was degradation rate of 52.65% in 180 min. The photodegradation of MC-LR by FA was shown to be conformed to the second-order reaction kinetics, with the same photodegradation products as the direct photolysis products in deionized water. The descending order of photodegradation effects of FA on MC-LR were described as pH 6 >pH 7 >pH 8 >pH 9 and 39.8 μmol/(s·m2)> 56.9 μmol/(s·m2)> 22.8 μmol/(s·m2), indicating that both pH value and light intensity affected the photodegradation of FA on MC-LR. The best promoting effect of FA on the MC-LR photodegradation was observed at pH 6 and light intensity of 39.8 μmol/(s·m2).

导出引用

汪艳昭, 张静静, 张达娟, 戴伟, 毕相东. 富里酸（FA）对微囊藻毒素-LR（MC-LR）的光降解作用及环境影响因素分析[J]. 大连海洋大学学报, 2024, 39(2): 281-288 https://doi.org/10.16535/j.cnki.dlhyxb.2023-220

WANG Yanzhao, ZHANG Jingjing, ZHANG Dajuan, DAI Wei, BI Xiangdong. Photodegradation of microcystin-LR (MC-LR) by fulvic acid (FA) and effect of environmental factors[J]. Journal of Dalian Fisheries University, 2024, 39(2): 281-288 https://doi.org/10.16535/j.cnki.dlhyxb.2023-220

中图分类号： S 964.3