生物炭
吸附
生物降解
化学
微囊藻毒素
生物滤池
水处理
复合数
环境化学
化学工程
核化学
细菌
环境工程
有机化学
材料科学
环境科学
蓝藻
复合材料
热解
生物
工程类
遗传学
作者
Lixun Zhang,Shengyin Tang,Sunny C. Jiang
出处
期刊:ACS ES&T water
[American Chemical Society]
日期:2023-08-29
卷期号:3 (9): 3044-3056
被引量:5
标识
DOI:10.1021/acsestwater.3c00240
摘要
Microcystin-LR (MC-LR), the most common algal toxin in freshwater, poses an escalating threat to safe drinking water. This study aims to develop an engineered biofiltration system for water treatment, employing a composite of poly(diallyldimethylammonium chloride)-biochar (PDDA-BC) as a filtration medium. The objective is to capture MC-LR selectively and quickly from water, enabling subsequent biodegradation of toxin by bacteria embedded on the composite. The results showed that PDDA-BC exhibited a high selectivity in adsorbing MC-LR, even in the presence of competing natural organic matter and anions. The adsorption kinetics of MC-LR was faster, and capacity was greater compared to traditional adsorbents, achieving a capture rate of 98% for MC-LR (200 μg/L) within minutes to tens of minutes. Notably, the efficient adsorption of MC-LR was also observed in natural lake waters, underscoring the substantial potential of PDDA-BC for immobilizing MC-LR during biofiltration. Density functional theory calculations revealed that the synergetic effects of electrostatic interaction and π-π stacking predominantly contribute to the adsorption selectivity of MC-LR. Furthermore, experimental results validated that the combination of PDDA-BC with MC-degrading bacteria offered a promising and effective approach to achieve a sustainable removal of MC-LR through an "adsorption-biodegradation" process.
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