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Method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron

A nano-zero-valent iron, organic wastewater technology, applied in water/sewage treatment, chemical instruments and methods, oxidized water/sewage treatment, etc. and other problems, to achieve the effect of promoting electron transfer, wide effective pH range, and no secondary pollution

Inactive Publication Date: 2015-03-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although zero valent iron / H 2 O / O 2 The oxidation system has excellent degradation performance, cheap materials, mild degradation reaction conditions, and non-toxic products, but it has the following problems in practical applications: (1) It mainly degrades pollutants through surface reactions, and its removal efficiency is limited by zero-valent iron mass transfer. The capacity limitation, and the different polarities of nano-iron and hydrophobic organic matter in the liquid phase will lead to low electron transfer efficiency between zero-valent iron and pollutants, and it is difficult to fully play the role; (2) The preparation process of nano-zero-valent iron is prone to agglomeration , it is very easy to be oxidized after the preparation is completed; (3) Nano zero-valent iron has strong reducing activity, chemical properties are unstable, easy to be oxidized, and the activity is reduced; (4) Nanomaterials have certain biological toxicity, are difficult to recycle, and enter the environment to form potential secondary pollution

Method used

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  • Method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron
  • Method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron
  • Method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron

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Experimental program
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Effect test

Embodiment 1

[0020] Prepare 5mL of rhodamine B dye wastewater with a concentration of 9.6mg / L, adjust the pH value to 6.5 with HCl or NaOH, and pass in air to make the molecular oxygen concentration in the water 3.0mg / L, add 20.0mg of zero-valent iron percent The content of 33.3% polyaniline-supported nano-zero-valent iron was used as a catalyst, and magnetic stirring was performed at room temperature. After 120 min, the degradation rate of rhodamine B was 83.4%.

[0021] Under the same experimental conditions, 6.7 mg of nano-zero-valent iron was added to 5 mL of rhodamine B dye wastewater as a catalyst, and the degradation rate of rhodamine B was 11.7% after 120 min of reaction.

Embodiment 2

[0023] Prepare 5mL 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 zero-valent iron percent The content of 33.3% polyaniline-supported nano-zero-valent iron was used as a catalyst, and magnetic stirring was performed at room temperature. After 120 min, the degradation rate of Rhodamine B was 76.9%.

[0024] Under the same experimental conditions, 6.7 mg of nano-zero-valent iron was added to 5 mL of rhodamine B dye wastewater as a catalyst, and the degradation rate of rhodamine B was 8.1% after 120 min of reaction.

Embodiment 3

[0026] Prepare 5mL of 2-chlorobiphenyl wastewater with a concentration of 1.0mg / L, adjust the pH value to 2.0 with HCl or NaOH, and introduce air to make the molecular oxygen concentration in the water 3.0mg / L, add 50.0mg of zero-valent iron Nano-sized zero-valent iron supported by polyaniline with a content of 33.3% was used as a catalyst, and magnetically stirred at room temperature. After 120 min, the degradation rate of 2-chlorobiphenyl was 72.2%.

[0027] Under the same experimental conditions, 16.7 mg of nano-zero-valent iron was added to 5 mL of 2-chlorobiphenyl wastewater as a catalyst, and the degradation rate of 2-chlorobiphenyl was 7.6% after 120 minutes of reaction.

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Abstract

The invention discloses a method for treating organic wastewater based on polyaniline loaded nanoscale zero-valent iron. The method comprises the following steps: taking polyaniline loaded nanoscale zero-valent iron as a catalyst and air or oxygen as an oxidant, activating oxygen to form active oxygen in situ, and degrading organic pollutants in water. The polyaniline loaded nanoscale zero-valent iron is high in catalytic activity; oxygen in the air can be directly utilized and is low in cost, environment-friendly, easy to recover and reusable; moreover, equipment in the method is simple and convenient to operate, the organic pollutants in the water can be efficiently degraded within a relatively wide pH range, and the method has a very good 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-loaded nanometer zero-valent iron. Background technique [0002] In recent years, advanced oxidation technology using zero-valent iron to activate molecular oxygen to treat biorefractory organic wastewater has been favored at home and abroad. at O 2 Under sufficient conditions, zero-valent iron can directly activate O 2 molecule, Fe produced under acidic conditions 2+ The transfer of electrons with oxygen (air) and low molecular weight organic acids produces O 2 R, O 2 ? , H 2 o 2 And active oxygen species such as OH, oxidatively degrades refractory biodegradable organic pollutants in water, and mineralizes them into CO 2 、H 2 O and inorganic ions. [0003] Although zero valent iron / H 2 O / O 2 The oxidation system has excellent degradation performance, cheap materials, mild degradation reactio...

Claims

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Application Information

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IPC IPC(8): C02F1/74
CPCC02F1/725C02F1/74C02F2101/30
Inventor 国伟林郝菲菲岳馨馨刘中华张琪颖李祥惠
Owner UNIV OF JINAN
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