期刊
CHEMOSPHERE
卷 288, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.132641
关键词
Microcystin-LR; Rapid detoxification; Selective catalytic hydrogenation; Supported Pd catalysts; Metal-support interactions
资金
- National Natural Science Foundation of China [21876075]
- National Key Research and Development Program of China [2019YFC1804201, 2020YFC1807002]
- NSF ERC, U.S.A on Nanotechnology-Enabled Water Treatment [EEC1449500]
In this study, TiO2-supported Pd catalysts were used to selectively hydrogenate the C--C bonds in the Adda moiety of MC-LR, achieving rapid detoxification in water. Catalytic hydrogenation significantly decreased the toxicity of MC-LR by 90.8% within 30 minutes, demonstrating effective detoxification. Surface adsorption and cationic Pd played crucial roles in the reaction kinetics.
The hepatotoxicity of Microcystin-LR (MC-LR) is mainly caused by its Adda moiety. In this study, we used TiO2supported Pd catalysts to selectively hydrogenate the C--C bonds in the Adda moiety, achieving rapid detoxification of MC-LR in water under ambient conditions. MC-LR was removed within 5 min by catalytic hydrogenation on Pd(1.0)/TiO2 with a catalyst dosage normalized rate constant of 1.3 x 10-2 L mgcat- 1 min- 1, significantly more efficient than other catalytic treatment methods. The reactions proceeded in a highly selective manner towards catalytic hydrogenation at the C--C bond of the Mdha moiety and subsequently the conjugated double bond of the Adda moiety, yielding two intermediates and one final product. Upon catalytic hydrogenation for 30 min on Pd(0.07)/TiO2, the toxicity of MC-LR (assessed by protein phosphatase 2A activity assay) drastically decreased by 90.8%, demonstrating effective detoxification. The influence of catalyst support, Pd content, initial MC-LR concentration, reaction pH, and catalytic stability were examined. Surface adsorption and the cationic Pd played a crucial role in the reaction kinetics. Our results suggest that catalytic hydrogenation is a highly effective and safe strategy for detoxifying MC-LR by selective reactions.
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