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Researchers from Fudan University Discuss Findings in Cyclic Peptides (A novel photocatalytic material for removing microcystin-LR under visible...

August 12, 2014



Researchers from Fudan University Discuss Findings in Cyclic Peptides (A novel photocatalytic material for removing microcystin-LR under visible light irradiation: degradation characteristics and mechanisms)

By a News Reporter-Staff News Editor at Life Science Weekly -- Fresh data on Peptides are presented in a new report. According to news reporting originating from Shanghai, People's Republic of China, by NewsRx correspondents, research stated, "Microcystin-LR (MC-LR), a common toxic species in contaminated aquatic systems, persists for long periods because of its cyclic structure. Ag3PO4 is an environment-friendly photocatalyst with relatively good degradation capacity for hazardous organic pollutants."

Our news editors obtained a quote from the research from Fudan University, "This study aimed to investigate the degradation capacity of Ag3PO4 for MC-LR under visible light. An Ag3PO4 photocatalyst was synthesized by the ion-exchange method and characterized by X-ray diffraction, field-emission scanning electron microscope, and UV-Vis spectrophotometer. MC-LR was quantified in each sample through high-performance liquid chromatograph. The degradation efficiency of MC-LR was affected by initial pH, initial Ag3PO4 concentration, initial MC-LR concentration, and recycle experiments. The degradation intermediates of MC-LR were examined by liquid chromatography-mass spectrometry (LC/MS). The degradation process can be well fitted with the pseudo-first-order kinetic model. The maximum MC-LR degradation rate of 99.98% can be obtained within 5 h under the following optimum conditions: pH of 5.01, Ag3PO4 concentration of 26.67 g/L, and MC-LR concentration of 9.06 mg/L. Nine intermediates were detected and analyzed by LC/MS. Three main degradation pathways were proposed based on the molecular weight of the intermediates and the reaction mechanism: (1) hydroxylation on the aromatic ring of Adda, (2) hydroxylation on the diene bonds of Adda, and (3) internal interactions on the cyclic structure of MC-LR."

According to the news editors, the research concluded: "Ag3PO4 is a highly efficient catalyst for MC-LR degradation in aqueous solutions."

For more information on this research see: A novel photocatalytic material for removing microcystin-LR under visible light irradiation: degradation characteristics and mechanisms. Plos One, 2014;9(4):e95798. (Public Library of Science - www.plos.org; Plos One - www.plosone.org)

The news editors report that additional information may be obtained by contacting X. Sui, Dept. of Environmental Science & Engineering, Fudan University, Shanghai, People's Republic of China. Additional authors for this research include X. Wang, H. Huang, G. Peng, S. Wang and Z. Fan (see also Peptides).

Keywords for this news article include: Asia, Shanghai, Microcystins, Photocatalyst, Nanotechnology, Photocatalytic, Cyclic Peptides, Emerging Technologies, People's Republic of China.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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