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Method for degrading contaminants in water body by using nanometer photocatalyst flocculate

A nano-photocatalyst, water pollutant technology, applied in chemical instruments and methods, light water/sewage treatment, physical/chemical process catalysts, etc., can solve the problems of poor treatment effect and low efficiency, and achieve small environmental impact and reduce Cost, effect of good photocatalytic effect

Active Publication Date: 2018-06-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of this method to treat wastewater is low and the treatment effect is poor.

Method used

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  • Method for degrading contaminants in water body by using nanometer photocatalyst flocculate
  • Method for degrading contaminants in water body by using nanometer photocatalyst flocculate
  • Method for degrading contaminants in water body by using nanometer photocatalyst flocculate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 200mg of nano-N-TiO 2 Add the powder into 1L of water, add different doses of PAFC, stir rapidly at 250rpm for 1min, and stir slowly at 40rpm for 20min. After the coagulation is completed, let it stand for 20 minutes, and determine the N-TiO by detecting the turbidity change of the supernatant (2cm below the liquid surface). 2 Whether the powder is completely coagulated. When the added PAFC is 20mg / L, N-TiO 2 The powder is fully coagulated, see figure 1 .

Embodiment 2

[0066] 500mg of nano-N-TiO 2 Add the powder into 1L of water, add different doses of PAFC, stir rapidly at 250rpm for 1min, and stir slowly at 40rpm for 20min. After the coagulation is completed, let it stand for 20 minutes, and determine the N-TiO by detecting the turbidity change of the supernatant (2cm below the liquid surface). 2 Whether the powder is completely coagulated. When the added PAFC is 20mg / L, N-TiO 2 The powder is fully coagulated, see figure 1 .

Embodiment 3

[0068] 1000mg of nano-N-TiO 2 Add the powder into 1L of water, add different doses of PAFC, stir rapidly at 250rpm for 1min, and stir slowly at 40rpm for 20min. After the coagulation is completed, let it stand for 20 minutes, and determine the N-TiO by detecting the turbidity change of the supernatant (2cm below the liquid surface). 2 Whether the powder is completely coagulated. When the added PAFC is 50mg / L, N-TiO 2 The powder is fully coagulated, see figure 1 .

[0069] In summary, in line with the principle of saving coagulants, 500mg of nano-N-TiO 2 The powder was added to 1L of water, and 20mg / L PAFC was added as the optimal coagulation condition.

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Abstract

The invention discloses a method for degrading contaminants in a water body by using a nanometer photocatalyst flocculate. The method comprises the following steps: firstly, adding a nanometer photocatalyst into water for uniformly dispersing; then adding a coagulant, stirring and finishing coagulating, wherein the nanometer photocatalyst flocculate is formed in the coagulating process, a nanometer photocatalyst is nano-nitrogen-doped titanium dioxide (N-TiO2) and the coagulant is polyaluminum ferric chloride (PAFC); secondly, after the coagulating is finished, separating the generated flocculate to obtain the nanometer photocatalyst flocculate; thirdly, adding the nanometer photocatalyst flocculate obtained in the second step into to-be-treated wastewater and putting the wastewater undervisible light for irradiating and finishing photocatalytic degradation of the contaminants in the wastewater. The nanometer photocatalyst is prepared into the flocculate and can be separated from a water body by adopting simple centrifugal separation steps. The prepared flocculate can be uniformly dispersed in a to-be-treated water body and is matched with the visible light for irradiating, so that the treatment efficiency and treatment effects of the wastewater are improved.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for degrading water body pollutants by using nanometer photocatalyst flocs. Background technique [0002] In recent years, the use of nano-photocatalytic materials to degrade water pollutants has been widely reported. The method is effective, the by-products are small, and it is not easy to cause secondary pollution of water bodies, so it is regarded as the future development direction of pollutant degradation. However, due to the small scale of nanomaterials, they will quickly and uniformly disperse after being added to the water body, and the existing separation methods may not be able to separate nanomaterials from water bodies at low cost, and they cannot be recycled, which greatly increases the processing cost. , limiting the large-scale application of nanophotocatalysts in the degradation of water pollutants. Moreover, after the water body dispersed with nanomateri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30B01J27/24B01J27/28B01J35/02
CPCC02F1/30B01J27/24B01J27/28C02F2305/10B01J35/50B01J35/40B01J35/39
Inventor 裴海燕金岩徐杭州
Owner SHANDONG UNIV
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