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Application of nano copper oxide/carbon nitride composite material in water bloom control

A technology of nano-copper oxide and composite materials, which is applied in the field of water pollution treatment, can solve unknown problems and achieve good reusability, stable performance, and low algae inhibition

Active Publication Date: 2020-09-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper as a traditional algicide, loading it to C 3 N 4 Surface to C 3 N 4 What is the effect of photocatalytic algae inhibition? There is no related report
And the C supported by copper-based nanomaterials 3 N 4 Can you improve C 3 N 4 The ability to degrade algae toxins? It is not yet known

Method used

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  • Application of nano copper oxide/carbon nitride composite material in water bloom control
  • Application of nano copper oxide/carbon nitride composite material in water bloom control
  • Application of nano copper oxide/carbon nitride composite material in water bloom control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] 1. Preparation of copper-loaded carbon nitride with different copper mass ratios:

[0046] Put 15g of urea in a muffle furnace, heat up to 550°C at a heating rate of 2°C / min, and keep heating at 550°C for 4 hours; then cool down to room temperature naturally, and wash the obtained white product three times with ethanol and distilled water, Remove unreacted urea. Subsequently, 1 g of the white product was dispersed in 400 mL of distilled water, ultrasonicated at 500 W for 8 h, centrifuged at 3000 rpm for 10 min to remove unstripped large particles, and the completely stripped product was freeze-dried to obtain purified C 3 N 4 , the freeze-drying method is: put the obtained reactant in a -20°C refrigerator for 12h, and then put it into a vacuum freeze-drying box, freeze-drying conditions: temperature -80°C, vacuum degree 8.5Pa, freeze-drying for 48h.

[0047] Take 64mg of purified C 3 N 4 Disperse into 0.00, 0.05, 0.10, 0.20, 0.50mM copper acetate solution, shake the...

Embodiment 2

[0051] Nano-copper oxide / carbon nitride composites for inhibiting algae growth:

[0052] Take the suspension of Microcystis aeruginosa, the initial density of Microcystis aeruginosa: 1.8×10 6 cells / mL, algae cells were cultured in 1 / 2 BG11 medium.

[0053] Make 10mL concentration 100mg / LC 3 N 4 , Cu-C 3 N 4 -1, Cu-C 3 N 4 -2, Cu-C 3 N 4 -3, Cu-C 3 N 4 -4 suspension was added to 90mL of algae cell culture medium, and kept shaking at 200rpm / min during the cultivation process. The daily light time and dark time are: 14h and 10h respectively, and the light intensity is 312μmol / m 2 / s. After 96 hours of exposure, use a hemocytometer to count the number of algae cells to determine the inhibition rate of various materials on the growth of algae cells. figure 2 for C 3 N 4 and different proportions of copper loading C 3 N 4 The comparison chart of anti-algae performance shows that the loading of copper significantly increases the C 3 N 4 Algae inhibitory performanc...

Embodiment 3

[0055] C at different concentrations and different exposure times 3 N 4 and Cu-C 3 N 4 -3's anti-algae performance:

[0056] The suspension of Microcystis aeruginosa and the conditions of exposure are all the same as in Example 2.

[0057] Calculation method of half effect concentration:

[0058]

[0059] with C 3 N 4 or Cu-C 3 N 4 -3 The logarithm of 10 for the treatment concentration is taken as the abscissa, and the algal cell inhibition rate of different treatment concentrations is used as the ordinate to calculate the regression equation and correlation coefficient of each treatment concentration. The corresponding treatment concentration when the inhibition rate is 50% is The median effect concentration.

[0060] Different concentrations (0, 1, 5, 10, 20, 50, 100mg / L) of C 3 N 4 and Cu-C 3 N 4 -3 was added to the suspension of Microcystis aeruginosa, and after exposure for 24, 48, 72, and 96 hours respectively, the number of algae cells was counted with a...

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Abstract

The invention discloses application of a nano copper oxide / carbon nitride composite material in water bloom control, and belongs to the field of water pollution treatment. Carbon nitride and copper acetate are used as raw materials, NaOH is added to react with copper ions to generate CuOH, then the CuOH is attached to C3N4 and converted into CuO through calcination, and thereby the nano copper oxide / carbon nitride composite material is obtained. Compared with copper and carbon nitride, the nano copper oxide / carbon nitride composite material has the advantages that the algal inhibition performance is effectively improved, and the algal inhibition performance of copper-loaded C3N4 prepared under the optimal copper loading ratio is 4.5 times that of C3N4; the nano copper oxide / carbon nitridecomposite material is stable in performance, and still has good water bloom control capacity in natural water with complex components. In addition, the reusability of the nano copper oxide / carbon nitride composite material prepared by the method is better than that of C3N4; therefore, algae inhibition is realized, and algal toxins can be rapidly removed at the same time.

Description

technical field [0001] The invention relates to the application of nanometer copper oxide / carbon nitride composite material in water bloom control and belongs to the field of water pollution treatment. Background technique [0002] Water bloom refers to the rapid growth of blue-green algae in freshwater water, and the phenomenon of water quality deterioration caused by the release of toxic algal toxins. It can cause the death of aquatic organisms, threaten human health, and even destroy the aquatic ecosystem. Therefore, it is imminent to efficiently control the occurrence of algae blooms and remove algal toxins in water. Visible photocatalytic technology has gradually attracted extensive attention of researchers in the control of algae blooms due to its high efficiency, safety, sustainability and low cost. [0003] Carbon Nitride (C 3 N 4 ) is a two-dimensional nano-semiconductor material formed by the multipolymerization of phosphatine ring structure. Because of its low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/72B01J35/00B82Y40/00C02F1/30
CPCB01J27/24B01J23/72B82Y30/00B82Y40/00C02F1/30C02F2305/10B01J35/39
Inventor 王震宇曹雪松王传洗
Owner JIANGNAN UNIV
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