A method for electrochemical recovery of hexavalent chromium with cus modified carbon cloth electrode

A modified carbon and hexavalent chromium technology, which is applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of slow removal rate and low removal rate of hexavalent chromium, Achieve the effects of accelerating efficiency, increasing electrochemical active area, and simple electrochemical technology

Active Publication Date: 2022-02-22
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0006] The present invention aims to solve the technical problems of low removal rate and slow removal rate of hexavalent chromium in existing electrochemical methods, and provides a method for electrochemically recovering hexavalent chromium with CuS modified carbon cloth electrodes

Method used

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  • A method for electrochemical recovery of hexavalent chromium with cus modified carbon cloth electrode
  • A method for electrochemical recovery of hexavalent chromium with cus modified carbon cloth electrode
  • A method for electrochemical recovery of hexavalent chromium with cus modified carbon cloth electrode

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specific Embodiment approach 1

[0026] Specific embodiment one: this embodiment is a method for electrochemically reclaiming hexavalent chromium with a CuS modified carbon cloth electrode, specifically as follows:

[0027] 1. Soak the carbon cloth in concentrated nitric acid aqueous solution for 24h to 25h, then rinse it with deionized water until it becomes neutral, and then dry it at 80°C to 85°C for 2h to 2.5h to obtain acidic carbon cloth;

[0028] 2. Dissolve copper sulfate pentahydrate and thioacetamide together in deionized water and stir for 30-40 minutes to obtain a mixed solution, then put it into a polytetrafluoroethylene autoclave, and then put the acidic carbon cloth prepared in step 1 completely Immerse in the mixed solution, react at 180°C to 190°C for 12h to 13h, then take out the carbon cloth and wash it with deionized water, and then dry it at 80°C to 90°C for 3h to 4h to obtain a CuS modified carbon cloth electrode;

[0029] The mass ratio of described copper sulfate pentahydrate and thioa...

specific Embodiment approach 2

[0032] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the carbon cloth model described in step 1 is HCP331N. Others are the same as the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass fraction of the concentrated nitric acid aqueous solution described in step one is 69%. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for electrochemically recovering hexavalent chromium by using a CuS modified carbon cloth electrode, and relates to a method for electrochemically recovering hexavalent chromium. The invention aims to solve the technical problems of low removal rate and slow removal rate of the existing electrochemical method for removing hexavalent chromium. The CuS modified carbon cloth electrode prepared by the present invention has a relatively high electrochemical active area, which is beneficial to the transmission of electrons, and can quickly reduce hexavalent chromium to non-toxic trivalent chromium, and at the same time achieve positively charged trivalent chromium For the adsorption of chromium, 90% of trivalent chromium can be adsorbed when it is degraded for 2 hours. The present invention enables the negatively charged CuS modified carbon cloth electrode to efficiently adsorb positively charged trivalent chromium through electrostatic adsorption to realize the recovery of chromium resources. The electrochemical technology used in the invention is simple, fast, green and has no secondary pollution. The invention is applied to removing hexavalent chromium in sewage and recovering trivalent chromium.

Description

technical field [0001] The invention relates to a method for electrochemically recovering hexavalent chromium. Background technique [0002] There are many kinds of pollutants in the world, but heavy metal pollutants have always been the top priority, and heavy metal pollutants seriously endanger the health of humans, other animals and plants. If heavy metal pollutants are discharged into rivers without treatment, they will pose a serious threat to the environment. Chromium, as one of the more harmful heavy metal pollutants, has become the key treatment object of various countries, and there are strict regulations on the discharge of chromium-related wastewater and the chromium content in drinking water. Among them, China stipulates in the "Comprehensive Wastewater Discharge Standard" (GB8978-1996) that the total amount of chromium discharged from wastewater must not exceed 1.5mg / L, and hexavalent chromium should be lower than 0.5mg / L. GB5749-2006) stipulates that the maxi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F101/22
CPCC02F1/46109C02F2001/46133C02F2101/22
Inventor 杨利明刘光珍罗旭彪易根平邵鹏辉石慧
Owner NANCHANG HANGKONG UNIVERSITY
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