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Method for efficiently degrading dye wastewater by piezoelectric catalysis

A dye wastewater, high-efficiency technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., can solve the problems of slow reaction speed, toxicity and high cost, achieve simple preparation process, enhance piezoelectricity properties, the effect of improving piezoelectricity

Active Publication Date: 2019-08-06
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method of using physical technology to treat dye wastewater, such as activated carbon adsorption, ultrafiltration, reverse osmosis, etc., only refers to the transfer of dyes from liquid phase to solid phase, which is easy to cause secondary pollution
Biological methods cannot be applied to most types of dye wastewater due to the stability of modern dyes and the toxicity of most industrial dyes to the organisms used in these processes
The main disadvantage of the chemical method is that the catalytic material can only be used once and cannot be recycled
The oxidation process prepared by He Lin, et al., such as photocatalytic degradation and Fenton oxidation, provides a non-toxic and effective method to overcome these shortcomings, but there are still problems of slow reaction speed, high cost and conditional use (Piezoelectrically induced mechano-catalytic effect for degradation of dyewastewater through vibrating Pb(Zr0.52Ti0.48)O3 fibers.AppliedPhysics Letters,2014,104(16):162907)

Method used

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  • Method for efficiently degrading dye wastewater by piezoelectric catalysis
  • Method for efficiently degrading dye wastewater by piezoelectric catalysis
  • Method for efficiently degrading dye wastewater by piezoelectric catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Weigh K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Li 2 CO 3 A ratio of 1:1:2:0.06 was used to synthesize KNLN. Weigh the above chemicals and put them into the ball mill tank. Milling time: 6h, rotating speed: 378r / min, ball milling beads: ZrO 2 , Ball milling medium: absolute ethanol, drying, sieving, column pressing, pre-calcination. Perform secondary ball milling, drying, and sieving.

[0030] 2) The powder is not polarized.

[0031] 3) The powder and 0.5wt% AgNO 3 The solutions were mixed and irradiated with ultraviolet light for 30 min.

[0032] 4) Ultrasonic catalysis was performed at a water temperature of 30°C, and the degradation rate was measured to be 50%.

Embodiment 2

[0034] 1) Weigh K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Li 2 CO 3 A ratio of 1:1:2:0.06 was used to synthesize KNLN. Weigh the above chemicals and put them into the ball mill tank. Milling time: 6h, rotating speed: 378r / min, ball milling beads: ZrO 2 , Ball milling medium: absolute ethanol, drying, sieving, column pressing, pre-calcination. Perform secondary ball milling, drying, and sieving.

[0035] 2) The powder is not polarized.

[0036] 3) The powder and AgNO with a mass fraction of 1wt% 3 The solutions were mixed and irradiated with ultraviolet light for 60 min.

[0037] 4) Ultrasonic catalysis was performed at a water temperature of 30°C, and the degradation rate was measured to be 70%.

Embodiment 3

[0039] 1) Weigh K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Li 2 CO3 A ratio of 1:1:2:0.06 was used to synthesize KNLN. Weigh the above chemicals and put them into the ball mill tank. Milling time: 6h, rotating speed: 378r / min, ball milling beads: ZrO 2 , Ball milling medium: absolute ethanol, drying, sieving, column pressing, pre-calcination. Perform secondary ball milling, drying, and sieving.

[0040] 2) Polarize the powder. The polarization field strength is 2kv, and the polarization time is 20min.

[0041] 3) The powder and AgNO with a mass fraction of 1wt% 3 The solutions were mixed and irradiated with ultraviolet light for 60 min.

[0042] 4) Ultrasonic catalysis was carried out at a water temperature of 30°C, and the degradation rate was measured to be 80%.

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Abstract

The invention discloses a method for efficiently degrading dye wastewater by piezoelectric catalysis, and the method comprises the following steps: 1) weighing K2CO3, Na2CO3, Nb2O5 and Li2CO3 according to a molar ratio of 1: 1: 2: 0.05-0.15 for synthesizing KNLN; 2) putting the chemical prepared in the step 1) into a ball milling tank for once ball milling, drying, sieving, column pressing and pre-sintering; carrying out secondary ball milling, drying and sieving to obtain powder; 3) polarizing the powder; 4) adding the powder into a AgNO3 solution, and carrying out silver simple substance loading on the AgNO3 solution through ultraviolet irradiation; and 5) ultrasonically catalyzing, and then using an ultraviolet spectrophotometer to detect the degraded solution and calculate the degradation rate. The method is simple and convenient in process, economical and reasonable, suitable for large-scale industrial production, and has important significance in improving piezoelectricity and dye wastewater degradation of potassium sodium niobate-based piezoelectric ceramics.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for efficiently degrading dye wastewater by using piezoelectric catalysis. Background technique [0002] The presence of large amounts of colored organic compounds in water, such as dyes discharged from textiles, tanning, printing, food or other industries, can cause serious environmental pollution and health problems. Most dyes have high solubility in water and stable chemical properties, which make it difficult to develop practical wastewater treatment processes. To date, various physical, chemical, and biological treatment methods have been used to remove colored organic compounds from industrial wastewater. The method of using physical technology to treat dye wastewater, such as activated carbon adsorption, ultrafiltration, reverse osmosis, etc., only refers to the transfer of dyes from liquid phase to solid phase, which is easy to cause secondary pollu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/36C02F101/30
CPCC02F1/36C02F2101/308
Inventor 刘智勇张安耿欣辉卢金山
Owner NANCHANG HANGKONG UNIVERSITY
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