不同分子量富里酸对藻毒素紫外光降解的影响

王刚; 张夏瑶; 王菲凤; 孙启元

doi:10.13205/j.hjgc.202201006

不同分子量富里酸对藻毒素紫外光降解的影响

doi: 10.13205/j.hjgc.202201006

福建师范大学环境科学与工程学院, 福州 350007

基金项目:

国家自然科学基金项目(52070044)

详细信息

作者简介:
王刚(1995-),男,硕士研究生,主要研究方向为饮用水安全。691433298@qq.com

通讯作者:
孙启元(1986-),男,副教授,主要研究方向为饮用水源地水质保障。minglei_2008@fjnu.edu.cn

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- 被引次数: 0
出版历程
- 收稿日期: 2021-04-13
- 网络出版日期: 2022-03-30
- 刊出日期: 2022-03-30

EFFECT OF FULVIC ACID WITH DIFFERENT MOLECULAR WEIGHT ON UV DEGRADATION OF MICROCYSTINS

School of Environmental Science and Engineering, Fujian Normal University, Fuzhou 350007, China

摘要

摘要: 蓝藻在生长繁殖过程中会向水体中释放具有生物毒性的微囊藻毒素(MC-LR),对人体健康存在潜在威胁。富里酸(FA)是水体中广泛存在的水环境介质,其不同分子量组分对MC-LR光降解的影响机理尚未明确。通过紫外光照实验,探究不同分子量FA及相关条件因素对紫外光降解MC-LR效果的影响。结果表明:MC-LR的降解率随着pH值的增大呈先降低再上升趋势;在纯水中紫外光降解120 min后,MC-LR降解率为60.10%;加入FA后,MC-LR降解率随着其浓度的增加而提高,在10 mgC/L时有62.18%的MC-LR降解;在不同分子量FA条件下,MC-LR降解率为54.52%~65.61%,且降解过程符合一级反应动力学方程,表观速率常数在分子量3~5 kDa,浓度10 mgC/L时最高,为0.03303 min^-1。研究可为优化FA与MC-LR之间的条件配比,促进MC-LR的降解提供参考。
- 富里酸 /
- 藻毒素 /
- 光催化 /
- 影响因素 /
- 降解动力学
Abstract: Cyanobacteria releases biotoxic microcystin(MC-LR) into the water column during its growth and reproduction, which is a potential threat to human health. Fulvic acid(FA) is a widely present aqueous environmental medium in water bodies, and the mechanism of its different molecular weight components on the photodegradation of MC-LR is unknown. In this study, we investigated the effects of molecular weight of FA and related condition factors on UV degradation of MC-LR through UV illumination experiments. The results showed that the degradation rate of MC-LR decreased and then increased with the increase of pH value; the degradation rate of MC-LR was 60.10% after 120 min of UV degradation in pure water; after FA was added, the degradation rate of MC-LR increased with the increase of its concentration, and 62.18% of MC-LR was degraded at 10 mgC/L. Under different molecular weight FA, the degradation rate range of MC-LR was 54.52%~65.61%, and the degradation process was in good accordance with the first-order reaction kinetic equation.The apparent rate constant was the highest when the molecular weight was 3~5 kDa and the concentration was 10 mgC/L, which was 0.03303 min^-1. This study provided a reference for optimizing the conditional ratio between FA and MC-LR and promoting the degradation of MC-LR.
- fulvic acid /
- algal toxin /
- photocatalysis /
- influencing factors /
- degradation kinetics

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