Method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave

A conductive polymer, synergistic microwave technology, applied in the reduction water/sewage treatment, chemical instruments and methods, circuits, etc. The advantages are obvious, the site area is reduced, and the effect of preventing ferrite corrosion

Active Publication Date: 2017-11-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the technical problems existing in the prior art of microwave-assisted treatment of Cr(VI)-containing wastewater in the research of large doses of chemicals, easy loss or high de

Method used

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  • Method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave
  • Method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave
  • Method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave

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Embodiment 1

[0032] A method for efficiently reducing hexavalent chromium in water with magnetically conductive polymers in cooperation with microwaves, the steps of which are as follows:

[0033] a. Microwave-assisted efficient reduction of hexavalent chromium: put 50mL aqueous solution containing 1mmol / L hexavalent chromium into a conical flask, adjust its pH to 2 with sulfuric acid, add 0.2g / L magnetic conductive polymer composite Fe 3 o 4 @PANI, after mixing, transfer the mixture to the microwave chemical reactor, start the microwave, the microwave power is 900W, the irradiation time is 5min, Fe 3 o 4 @PANI absorbs microwaves to quickly reduce hexavalent chromium;

[0034] b. Magnetic separation and recycling of magnetic conductive polymers: After the reaction is complete, use a magnet to separate the Fe in step a 3 o 4 @PANI, after washing with pure water, it can be directly put into the next reaction batch;

[0035] c. The trivalent chromium generated by the reduction reaction i...

Embodiment 2

[0042] With embodiment 1, difference is: adopt oxalic acid to adjust pH to 3 in step a, Fe 3 o 4 The dosage of @PANI was reduced to 0.1g / L, and the duration of microwave irradiation was reduced to 3min. Under other conditions being the same, the reduction rate of Cr(VI) reaches 99%.

Embodiment 3

[0044] With embodiment 1, difference is: in step a, adjust pH to 4 with hydrochloric acid, Fe 3 o 4 The dosage of @PANI was increased to 1.0g / L, the microwave power was 540W, and the irradiation time was 2min. Under other conditions being the same, the reduction rate of Cr(VI) reaches 96%.

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Abstract

The invention belongs to the field of heave metal waste water, and particularly relates to a method for efficiently reducing hexavalent chromium in water by magnetic electric conduction macromolecule synergistic microwave. The method comprises the following steps that: regulating waste water which contains the hexavalent chromium by inorganic acid or small molecular organic acid to obtain solution of which the pH (Potential of Hydrogen) is acidic; adding a magnetic electric conduction macromolecule material of a nuclear shell structure; after even mixing, transferring to a microwave chemical reactor to react, reducing the hexavalent chromium in the waste water into trivalent chromium, and then, carrying out separation and recovery on the magnetic electric conduction macromolecule material by a permanent magnet; utilizing the magnetic electric conduction macromolecule to effectively adsorb the surface enrichment of the hexavalent chromium and microwave energy, and realizing the efficient reduction of the high-toxicity hexavalent chromium in a microwave field. Compared with other technologies, the method has an obvious kinetic advantage; the regeneration of the magnetic electric conduction macromolecule can be realized by the microwave, and a magnetic separation and recovery material can be recycled. The method is simple, efficient and easy in industrialization and has an obvious economic and environment benefit.

Description

technical field [0001] The invention belongs to the field of heavy metal wastewater treatment, and more specifically relates to a method for efficiently reducing hexavalent chromium in water by magnetically conductive polymers in cooperation with microwaves. Background technique [0002] Chromium pollution in water mainly comes from wastewater discharged from industries such as chemical industry, metallurgy, and printing and dyeing. The stable forms of chromium in nature are mainly Cr(VI) and Cr(III), and the mutual conversion between the two is affected by the pH of the water, the oxidation-reduction potential, and the temperature. The biological toxicity of Cr(VI) is more than 100 times that of Cr(III), and it is one of the national priority pollutants. Cr(VI) can enter the human body through the biological chain, has a significant triple effect, and seriously endangers human health. Therefore, the effective control of Cr(VI) in water has always been the focus of researc...

Claims

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Application Information

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IPC IPC(8): C02F9/12H01F41/02C02F101/22
CPCC02F1/302C02F1/481C02F1/488C02F1/66C02F1/70C02F9/00C02F2101/22C02F2301/08H01F41/0253
Inventor 刘福强朱长青宋丽朱增银仇欢李爱民
Owner NANJING UNIV
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