Iron inner electrolysis catalyst and preparation method thereof

An internal electrolysis and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low redox potential, hard-won copper shavings, and easy hardening of iron and carbon, and achieve enhanced Oxidative degradation performance, good pretreatment effect, and the effect of improving oxidative capacity

Inactive Publication Date: 2011-01-05
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has many disadvantages: (1) After a period of use, iron and carbon are easy to harden, resulting in channeling and affecting its treatment effect; (2) The oxidation-reduction potential between the iron-carbon electrodes is small, which affects the flow of organic molecules on the electrodes. (3) The efficiency of electrolytic treatment of wastewater in iron-carbon is not high, etc.
Aiming at the traditional iron-carbon internal electrolysis technology, Chinese patent CN101671067 discloses a method of using gas and water backwashing to catalyze the electrolytic filler in iron, which overcomes the problem that iron-carbon is easy to harden; Chinese patent CN02111901 discloses a method for using iron-copper electro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Take 100g of 4A silica-alumina zeolite molecular sieves that have been roasted at 500°C, respectively, and immerse them in 500ml of copper nitrate solution with a concentration of 0.5mol / L and 500ml of manganese nitrate solution with a concentration of 0.6mol / L, and drain after immersion for 30min. Drying at 110° C. for 5 h and calcining at 300° C. for 3 h to obtain molecular sieve-supported copper oxide with a copper loading of 12% and molecular sieve-supported manganese dioxide with a manganese dioxide loading of 14%.

[0027] 2) Molecular sieve-loaded copper oxide was mixed with 3% (H 2 / N 2 , v / v) The mixed gas was reduced at 230° C. for 2.5 hours, and then the elemental copper supported by molecular sieves was obtained.

[0028] 3) The natural manganese sand is mechanically crushed and sieved to produce particles with a diameter of 2 to 5 mm.

[0029] 4) 50g of iron shavings, 20g of copper-plated iron shavings, 5g of elemental copper loaded on molecular sieves...

Embodiment 2

[0031] According to the preparation method of Example 1, the molecular sieve-supported elemental copper with a copper loading of 20% and the molecular sieve-supported manganese dioxide with a manganese dioxide loading of 25% were prepared.

[0032] 50g of iron shavings, 20g of copper-plated iron shavings, 5g of elemental copper loaded on molecular sieves, 4g of manganese dioxide loaded on molecular sieves, and 4g of natural manganese sand containing 30% of manganese dioxide are evenly mixed to form the catalytic iron internal electrolytic filter material, and 1mol / L sulfuric acid to adjust the acidity of printing and dyeing wastewater to make pH=5, and the treatment time is 60 minutes. After electrolytic treatment in catalytic iron, the chroma of the effluent is 160, the chroma removal rate is 75%, CODcr=670, and the CODcr removal rate is 58.7%.

Embodiment 3

[0034] According to the preparation method of Example 1, the molecular sieve-supported elemental copper with a copper loading of 5% and the molecular sieve-supported manganese dioxide with a manganese dioxide loading of 20% were prepared.

[0035] With 50g of iron shavings, 20g of copper-plated iron shavings, 5g of elemental copper loaded on molecular sieves, 5g of manganese dioxide loaded on molecular sieves, and 5g of natural manganese sand containing 45% of manganese dioxide, they are evenly mixed to form the electrolytic filter material in the catalytic iron. 1mol / L sulfuric acid adjusts the acidity of printing and dyeing wastewater to make pH=5, and the treatment time is 60 minutes. After internal electrolytic treatment with catalytic iron, the chroma of the effluent is 175, the chroma removal rate is 73%, CODcr=765, and the CODcr removal rate is 52.8%.

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PUM

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Abstract

The invention relates to catalysts for treating industrial waste water, in particular to an iron inner electrolysis catalyst and a preparation method thereof. The iron inner electrolysis catalyst comprises the following components: simple copper supported by molecular sieves, manganese dioxide supported by molecular sieves, and natural manganese ore with the mass ratio thereof being 1:0.5-1.0:0.5-1.0. The preparation method thereof comprises the following steps: respectively immersing roasted molecular sieves in the solutions of soluble copper salt and manganese salt by the supporting capacity of copper and manganese dioxide; dipping, drying and roasting the molecular sieves to respectively obtain the copper oxide and manganese dioxide supported by the molecular sieves; crushing and sieving the natural manganese ore to obtain the natural manganese ore granules; reducing the copper oxide supported by the molecular sieves by using hydrogen to obtain the simple copper supported by the molecular sieves; and mixing the simple copper supported by molecular sieves, manganese dioxide supported by molecular sieves, and natural manganese ore granules by the mass ratio to obtain the product. Accordingly, the invention is suitable for the pre-treatment before the biochemical treatment of high-chromaticity non-biodegradable industrial waste water.

Description

technical field [0001] The invention relates to a catalyst for treating industrial waste water, in particular to an iron-in electrolytic catalyst and a preparation method thereof. Background technique [0002] In recent years, with the increasing pollution of surrounding water bodies and soil by industrial wastewater such as dyeing and finishing, chemical industry, and electroplating, especially dyeing and finishing wastewater often contains highly toxic dyes and intermediates, as well as refractory biodegradable combustion aids and acids. , alkalis, inorganic salts, etc. This type of industrial wastewater has large water volume, high chroma, high CODcr content, and poor biodegradability. Compared with urban domestic sewage, it is more difficult to treat. At present, the treatment methods for this kind of industrial wastewater often use physical and chemical methods as pretreatment of biochemical methods. Physicochemical methods have problems such as high processing costs ...

Claims

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Application Information

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IPC IPC(8): B01J29/076B01J29/78C02F1/461C02F1/28
Inventor 陈鸿博林昌健孙岚谢鲲鹏
Owner XIAMEN UNIV
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