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An electrochemical water treatment method for simultaneous reduction of chromium and arsenic oxide

An electrochemical and arsenic oxide technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., to achieve the effects of improving current utilization efficiency, reducing side reactions, and reducing costs

Active Publication Date: 2016-09-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, the electrochemical water treatment method that can simultaneously reduce chromium and arsenic oxide using particle electrodes has not been reported yet.

Method used

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  • An electrochemical water treatment method for simultaneous reduction of chromium and arsenic oxide
  • An electrochemical water treatment method for simultaneous reduction of chromium and arsenic oxide
  • An electrochemical water treatment method for simultaneous reduction of chromium and arsenic oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Preparation of carbon nanotube composite sensing particle electrode supported by gold-palladium alloy with a mass fraction of 5% and a spherical particle size of about 5 nm:

[0044] (1) 1 g of multi-walled carbon nanotubes was dispersed in 50 mL of concentrated nitric acid solution, and stirred under reflux in an oil bath at 160° C. for 1.5 hours. Then it was naturally cooled to room temperature, added dropwise to 1L ultrapure water in an ice-water bath, and stirred overnight. Finally, filter and wash with a PTFE filter membrane with a pore size of 0.2 micron to remove excess acid until the pH of the washing solution is 7, and then dry the carbon tube at room temperature.

[0045] (2) Pretreatment of carbon nanotubes with cetyltrimethylammonium bromide (CTAB): disperse the acidified carbon nanotubes in 250 mL of ultrapure water, and ultrasonicate for 30 minutes to form a carbon nanotube dispersion. Weigh 45.56g of CTAB and add it to the carbon nanotube dispersion, and...

Embodiment 2

[0060] Preparation of carbon nanotube composite sensing particle electrode supported by gold-palladium alloy with a mass fraction of 1% and a spherical particle size of about 50 nm:

[0061] (1) 1 g of multi-walled carbon nanotubes was dispersed in 50 mL of concentrated nitric acid solution, and stirred under reflux in an oil bath at 160° C. for 1.5 hours. Then it was naturally cooled to room temperature, and added dropwise to 1L of ultrapure water in an ice-water bath (concentrated sulfuric acid exotherms when it meets water), and stirred overnight. Finally, filter and wash with a PTFE filter membrane with a pore size of 0.2 micron to remove excess acid until the pH of the washing solution is 7, and then dry the carbon tube at room temperature.

[0062] (2) Pretreatment of carbon nanotubes with cetyltrimethylammonium bromide (CTAB): disperse the acidified carbon nanotubes in 250 mL of ultrapure water, and ultrasonicate for 30 minutes to form a carbon nanotube dispersion. Wei...

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Abstract

The invention provides an electrochemical water treatment method for simultaneously reducing chromium and arsenic oxide, relates to application of a carbon-based composite induction particle electrode in treatment of arsenic and chromium concentration exceeded wastewater, can be applied to in-situ-efficient-catalysis-O2-reduction H2O2 production in electrocatalytic reaction and belongs to the technical field of electrochemical water treatment. The carbon-based composite induction particle electrode is a spherical rhotanium loaded carbon nanotube complex. The method comprises the main steps: adjusting the pH value of the wastewater to 2-4; enabling the wastewater to stay in an induction electrochemical reaction system filled with the carbon-based composite induction particle electrode for 1-60 minutes, and then, adjusting the pH value of the wastewater to 7-8 and then discharging the wastewater. According to the method, arsenic and chromium in the wastewater are treated simultaneously by adopting an indirect electrochemical method, and the indirect electrochemical method can be matched with adsorption, coprecipitation and the like, so that a guarantee that wastewater treatment reaches emission standards is provided, and new technical approaches and theoretical bases are provided for control on heavy-metal wastewater.

Description

technical field [0001] The invention relates to the application of an electrode capable of simultaneously reducing chromium and arsenic oxide, in particular to a wastewater treatment method for simultaneously reducing chromium and arsenic oxide by applying it to electrochemistry, and belongs to the technical field of electrochemical water treatment. Background technique [0002] The wastewater discharged by industrial enterprises in my country contains a large amount of highly toxic heavy metal ions, among which arsenic and chromium are the most common and most harmful. Arsenic (As) is mostly arsenous acid (AsO 2 - ) form, arsenous acid is extremely toxic, and its chemical properties are stable and difficult to form precipitates to remove from water, but its oxidation product arsenic acid (HAsO 3 , As 5+ ) is more than ten times less toxic than arsenous acid, and it is easy to form sulfide precipitates or be removed from water by adsorption of iron oxides. On the contrar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/461C02F101/20C02F101/22
Inventor 曲久辉孙猛李景虹刘会娟刘锐平
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI