Method for reinforcing piezoelectric effect to improve organic pollutant degradation efficiency and application thereof

A technology of organic pollutants and efficiency, applied in electrochemical water/sewage treatment, mechanical oscillation water/sewage treatment, etc., can solve the problem of low degradation ability of organic pollutants treatment

Inactive Publication Date: 2015-10-28
SUN YAT SEN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and technical deficiencies of the existing organic pollutants with low processing and degradation ability, and provide a method for strengthening the piezoelectric effect and further improving the degradation efficiency of organic pollutants, which involves strengthening nano-micro piezoelectric materials to A technology that converts mechanical energy into chemical energy to generate hydroxyl radicals on site and degrade organic pollutants in water

Method used

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  • Method for reinforcing piezoelectric effect to improve organic pollutant degradation efficiency and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1 Preparation of nano-micro Ag / BaTiO 3 composite piezoelectric material

[0058] S1. Preparation of BaTiO3 (nano-micro barium titanate)

[0059] S11. Slowly drop 40 mL of tetraethyl titanate into 400 mL of 1 mol / L glacial acetic acid under constant stirring. After stirring continuously for 72 h with a magnetic stirrer at room temperature, use a speed of 4000 r / min Centrifuge, extract the precipitate after centrifugation, wash the precipitate with deionized water, and dry it at 60 °C for 48 h to obtain titanium hydroxide;

[0060] S12 Add 0.25 mol / L sodium hydroxide, 0.06 mol / L titanium hydroxide (dried) and 0.06 mol / L barium hydroxide octahydrate to the polytetrafluoroethylene-lined tank under continuous stirring. In the hydrothermal reaction kettle (keep the volume of sodium hydroxide added at 60% of the lining capacity of the hydrothermal reaction kettle), seal the hydrothermal reaction kettle in an oven, and conduct a hydrothermal reaction at 200 °C fo...

Embodiment 2

[0066] Example 2 BaTiO 3 System H 2 O 2 production

[0067] 1. Add 0.10 L of deionized water and 20 g / L of BaTiO to the reactor 3 After shaking well, place in a 40 KHz, 300W ultrasonic cleaning tank to oscillate and inject oxygen with different flow rates.

[0068] 2. It is found that there is H in the system 2 o 2 produced, and with the addition of O 2 Can increase H 2 o 2 concentration. Under the conditions of oxygen flow rates of 0.0 L / min, 0.05 L / min and 0.10 L / min respectively, H 2 o 2 The concentrations reached 1.84 mg / L, 1.99 mg / L and 2.10 mg / L respectively.

Embodiment 3

[0069] Example 3 Iron ions on BaTiO 3 The influence of the system on the efficiency of degrading organic pollutants

[0070] 1. Add 0.10 L of dye wastewater containing 20 mg / L Acid Orange II and 9 g / L BaTiO to the reactor 3 After shaking well, place in a 40 KHz, 300W ultrasonic cleaning tank to oscillate, and add different amounts of FeSO 4 (without adding FeSO 4 group as a control).

[0071] 2. The results show that under the conditions of iron ion concentrations of 0.0 mg / L, 1.0 mg / L, 2.0 mg / L and 4.0 mg / L, the degradation rates of Acid Orange II are 60.2% and 78.8% within 30 minutes , 81.3% and 84.3% mg / L.

[0072] relative to BaTiO 3 The addition of different concentrations of iron ions increased the degradation efficiency of organic pollutants by 18.6%, 21.1% and 24.1%, respectively.

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Abstract

The invention discloses a method for reinforcing the piezoelectric effect to improve organic pollutant degradation efficiency and application thereof. The method mainly adopts a two-step reinforcement process. In the first step, nano-silver is loaded to a nano-micro BaTiO3 surface to obtain an Ag / BaTiO3 composite piezoelectric material. In the composite piezoelectric material, by means of the good electric conduction effect of Ag, pressure-induced electron transfer is accelerated, compounding of pressure-induced holes and electrons is reduced, reduction of pressure-induced electrons and dissolved oxygen is promoted, and the concentration of active oxygen free radicals is increased, thereby enhancing the efficiency of degrading organic pollutants by piezoelectric effect. In the second step, iron-containing substances are added into an organic pollutant degradation system to convert the H2O2 generated and accumulated by the piezoelectric system into highly active hydroxyl free radicals, thus further improving the efficiency of degrading organic pollutants by piezoelectric effect. The method provided by the invention is suitable for degradation treatment of a variety of organic pollutants, can efficiently utilize the vibration energy in the environment to treat pollution, and has important application value.

Description

technical field [0001] The invention belongs to sewage and wastewater treatment technology, and more specifically relates to a method for strengthening the piezoelectric effect and improving the degradation efficiency of organic pollutants and its application. Background technique [0002] At present, the pollution of organic matter in water sources in my country is very serious, and there are more and more types of organic matter, which not only increases the difficulty of water treatment, but also toxic small molecular organic matter is difficult to degrade, accumulates in organisms, and has strong three-cause effects (carcinogenic, teratogenic, mutagenic) or chronic toxicity. The research on the degradation technology of organic pollutants has attracted more and more attention. [0003] The piezoelectric effect is an effect in which mechanical energy and electrical energy can be converted into each other. Since the Curie brothers discovered the piezoelectric effect in 18...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/36C02F1/46
Inventor 熊亚田双红吕维付尧魏晓丹
Owner SUN YAT SEN UNIV
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