Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 22, Issue 21, Pages 17202-17208Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-015-4956-y
Keywords
High-voltage pulsed plasma discharge; OH radicals; UV radiation; TiO2; Porous materials
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Funding
- Zhejiang Province Welfare Technology Applied Research Project [2014C31137]
- National Natural Science Foundation of China (NSFC) [U1462201, U1162128]
- Fundamental Research Funds for the Central Universities [2015QNA4032]
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The novel catalysts of Mn/Ti-doped carbon xerogel (CX) were synthesized for efficient degradation of microcystin-LR (MC-LR) in the water surface discharge plasma reactor. The degradation efficiency of 79.7 % was obtained in 6 min with 0.5 wt% Ti impregnation of CX, and it would be increased with higher amount of Ti. In particular, Mn-doped CX resulted in larger mesoporous particle diameter and higher porosity in the matrix, and thereby, the highest efficiency of 88.6 % was achieved for CX-Ti-Mn. The possible degradation pathway of MC-LR was elucidated on the basis of the LC-MS analysis. It demonstrated that Adda chain was cleaved from the MC-LR cyclic peptide by OH radical attack after plasma discharge in the presence of catalysts, and the generated nontoxic products can be further easily degraded in the biological treatment. Therefore, Mn/Ti-doped carbon xerogel is promising as the catalyst for the improvement of MC-LR degradation in the water surface discharge plasma reactor.
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