Abstract
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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Acknowledgments
This work was partially supported by the Zhejiang Province Welfare Technology Applied Research Project (No. 2014C31137), National Natural Science Foundation of China (NSFC) (No. U1462201, U1162128), and the Fundamental Research Funds for the Central Universities (2015QNA4032).
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Xin, Q., Zhang, Y., Li, Z. et al. Mn/Ti-doped carbon xerogel for efficient catalysis of microcystin-LR degradation in the water surface discharge plasma reactor. Environ Sci Pollut Res 22, 17202–17208 (2015). https://doi.org/10.1007/s11356-015-4956-y
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DOI: https://doi.org/10.1007/s11356-015-4956-y