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Organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron

A nano-zero-valent iron, organic wastewater technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of low cost, simple preparation process and rapid degradation

Inactive Publication Date: 2015-01-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the special physical and chemical properties of nano-zero-valent iron, there are the following problems in practical applications: (1) Nano-zero-valent iron is easy to agglomerate due to its small particle size, large specific surface area, large surface energy and its own magnetism; (2) ) is easily oxidized in the air, forming a passivation layer and reducing activity; (3) Due to the certain biological toxicity of nanomaterials, in practical applications, nano-zero-valent iron is difficult to recycle, which will form potential secondary pollution

Method used

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  • Organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron
  • Organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron
  • Organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Prepare 10mL of rhodamine B dye wastewater with a concentration of 2.5mg / L, adjust the pH value to 3.3 with HCl or NaOH, and pass in air to make the molecular oxygen concentration in the water 3.0mg / L, add 20.0mg of polyaniline-coated Nano-zero-valent iron (the mass ratio of polyaniline to nano-zero-valent iron is 1:10) and 1.0 mg of anthraquinone-2-sulfonic acid sodium salt are stirred magnetically at room temperature. After 120 minutes, the degradation rate of Rhodamine B was 88.5%.

[0029] Under the same experimental conditions, 18.0 mg of nano-zero-valent iron and 1.0 mg of anthraquinone-2-sulfonic acid sodium salt were added to 10 mL of rhodamine B dye wastewater, and the degradation rate of rhodamine B was 39.2% after 120 minutes of reaction.

Embodiment 2

[0031] Prepare 10mL of rhodamine B dye wastewater with a concentration of 30.0mg / L, adjust the pH value to 6.5 with HCl or NaOH, and pass in oxygen to make the molecular oxygen concentration in the water 8.0mg / L, add 20.0mg of polyaniline-coated Nano-zero-valent iron (the mass ratio of polyaniline to nano-zero-valent iron is 1:10) and 1.0 mg cobalamin are stirred magnetically at room temperature. After 120 minutes, the degradation rate of Rhodamine B was 72.4%.

[0032] Under the same experimental conditions, 18.0 mg nanometer zero-valent iron and 1.0 mg cobalamin were added to 10 mL rhodamine B dye wastewater, and the degradation rate of rhodamine B was 31.7% after 120 min of reaction.

Embodiment 3

[0034] Prepare 10mL of 2-chlorobiphenyl wastewater with a concentration of 1.0mg / L, adjust the pH value to 3.0 with HCl or NaOH, and pass in air to make the molecular oxygen concentration in the water 2.0mg / L, add 100.0mg of polyaniline to coat Type nano-sized zero-valent iron (the mass ratio of polyaniline to nano-sized zero-valent iron is 1:5) and 0.1 mg of anthraquinone-2-sulfonic acid sodium salt, and magnetically stirred at room temperature. After 120 minutes, the degradation rate of 2-chlorobiphenyl was 70.8%.

[0035] Under the same experimental conditions, 80.0 mg of nano-zero-valent iron and 0.1 mg of anthraquinone-2-sulfonic acid sodium salt were added to 10 mL of 2-chlorobiphenyl wastewater, and the degradation rate of 2-chlorobiphenyl was 33.5% after 120 minutes of reaction.

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Abstract

The invention discloses an organic wastewater treatment method based on polyaniline coated nanometer zero-valent iron. The organic wastewater treatment method comprises the following steps: taking the polyaniline coated nanometer zero-valent iron as a catalyst, taking air or oxygen as an oxidizing agent, meanwhile adding a redox mediator, activating oxygen to form active oxygen in situ, and degrading organic pollutants in the water. The polyaniline coated nanometer zero-valent iron is high in catalytic activity, capable of directly utilizing oxygen in air, low in cost, environment-friendly, easy to recycle, and capable of being recycled; the method is simple in equipment, convenient to operate, and capable of efficiently degrading the organic pollutants in the water within a wider pH value range, and has a bright application prospect.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating organic wastewater based on polyaniline-coated nanometer zero-valent iron. Background technique [0002] In recent years, based on zero-valent iron / O 2 The advanced oxidation technology of the oxidation system has received extensive attention at home and abroad. This technology can effectively treat a variety of organic pollutants in water (such as halogenated hydrocarbons, pesticides and dyes, etc.). In this system, there are two main mechanisms for the formation of reactive oxygen species: one is that zero-valent iron interacts with O through a two-electron transfer pathway. 2 The reaction produces H 2 o 2 ; The second is the Fe produced by the oxidation of zero-valent iron 2+ via the one-electron transfer path with O 2 The reaction produces H 2 o 2 . Then, the generated Fe 2+ and H 2 o 2 Hydroxyl radicals are generated by the Fen...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/74C02F101/30
Inventor 岳馨馨刘中华张琪颖李祥惠郝菲菲国伟林
Owner UNIV OF JINAN
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