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Method used for degrading microcystin-LR in water by using visible-light-induced photocatalyst silver phosphate

A technology of microcystins and catalysts, which is applied in chemical instruments and methods, light water/sewage treatment, energy and wastewater treatment, etc. Effect

Inactive Publication Date: 2013-11-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Invention describes two methods for producing chemical compounds from solar rays: one involves useing XENON lamps or similar sources like those found on space missions; another focuses on improving their efficiency by utilizing special materials called Silver Phosphates (SP) instead of traditional photo-catalysis processes. These techniques aim at making certain types of molecules faster while reducing environmental concerns associated therewith.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to reduce excessive amounts of nitrogen compounds from industrial wastewater streams through biological processes such as decomposition with various types of enzymes called mangilyspora spp., polygala macrocyte luteum spore complex, chlorophyll anion lyase, etc.. These chemical reactions cause damage to aquatic ecosystems like oceans' creatures, causing them becoming overfished and dying off quickly due to lack of food sources. To solve these issues, there needs effective treatments against algalgia growth caused by certain nutrients found naturally occurring throughout our bodies.

Method used

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  • Method used for degrading microcystin-LR in water by using visible-light-induced photocatalyst silver phosphate
  • Method used for degrading microcystin-LR in water by using visible-light-induced photocatalyst silver phosphate
  • Method used for degrading microcystin-LR in water by using visible-light-induced photocatalyst silver phosphate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] At room temperature, the volume of the solution is 50 ml, and the pH is the original value. The concentration of MC-LR solution was 11.70 mg / L, without adding silver phosphate catalyst, after magnetic stirring for 1 h in the dark, the xenon lamp light source was turned on, and about 1.5 ml was sampled every 1 h to detect the concentration by HPLC. After 5 hours of light irradiation, the concentration of MC-LR was 11.69 mg / L, basically not degraded.

Embodiment 2

[0028] At room temperature, the volume of the solution is 50 ml, and the pH is the original value. Add 0.35 g of silver phosphate powder to the solution with MC-LR concentration of 11.70 mg / L, stir magnetically for 1 h in the dark, turn on the xenon light source, and sample about 1.5 ml every 1 h to detect the concentration by HPLC. After 5 h of light exposure, the concentration of MC-LR decreased to 6.88 mg / L, and the degradation rate reached 34.59 %.

Embodiment 3

[0030] At room temperature, the volume of the solution is 50 ml, and the pH is the original value. Add 0.68 g of silver phosphate powder to the solution with MC-LR concentration of 11.70 mg / L, stir magnetically for 1 h in the dark, turn on the xenon lamp, and sample about 1.5 ml every 1 h to detect the concentration by HPLC. After 5 h of light, the concentration of MC-LR decreased to 0.50 mg / L, and the degradation rate reached 95.59%.

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Abstract

The invention belongs to the field of environmental protection technologies, and more specifically relates to a method used for degrading microcystin-LR in water by using silver phosphate catalyst. The microcystin-LR is degraded by application of hydroxy free radicals which are generated by irradiation to silver phosphate under a simulated visible light source, wherein the simulated visible light source is a xenon lamp. Conjugated double bonds, phenyl ring groups and methoxy groups on the side chains of Adda amino acid and unsaturated double bonds of the heptapeptide ring of microcystin-LR are attacked by the hydroxy free radicals, so that the structures are changed, microcystin-LR is degraded completely, and detoxification is realized. When experimental parameters are reasonable, degradation rate on microcystin-LR in 5h can reach to 99.91%.

Description

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Claims

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Application Information

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Owner FUDAN UNIV
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