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Method for removing pollutant in water by palladium-catalyzed polyhydroxy ferrous-reduced method

A technology for catalyzing polyhydric ferrous and pollutants, applied in water pollutants, reduced water/sewage treatment, chemical instruments and methods, etc., can solve problems such as slow speed and limited application range, and achieve simple equipment, low price, The effect of increasing the reduction reaction activity

Active Publication Date: 2013-07-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pure ferrous hydroxyl compound prepared by the Chinese patent "Preparation of polyhydric ferrous compound and its use in wastewater reduction pretreatment" (CN102060334A) has strong reducing properties, can reduce and decolorize dyes, and can be used in printing and dyeing wastewater Reduction pretreatment, but experimental studies have shown that the rate of polyhydric ferrous reduction of halogenated aromatic compounds is very slow, and it is almost impossible to dehalogenate them
Moreover, the actual industrial wastewater often contains a variety of refractory pollutants, especially chlorinated organic compounds with complex structures, so its application range is limited to a certain extent.

Method used

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  • Method for removing pollutant in water by palladium-catalyzed polyhydroxy ferrous-reduced method
  • Method for removing pollutant in water by palladium-catalyzed polyhydroxy ferrous-reduced method
  • Method for removing pollutant in water by palladium-catalyzed polyhydroxy ferrous-reduced method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Weigh 63mg of Na 2 SO 3 Dissolve in 1L of water with dissolved oxygen removed to form an aqueous sodium sulfite solution with a molar concentration of 0.5mmol / L, and add 10mg of cobalt chloride. Then weigh 139g of FeSO 4 ·7H 2 O was added to the solution and stirred slowly until the ferrous sulfate was completely dissolved. Add 10mg / L of anionic polyacrylamide as a dispersant.

[0026] (2) Add 10 mol / L NaOH solution dropwise to the above solution, and stir while adding dropwise, so that the pH value of the system reaches 8.5, and an obvious dark green precipitate is seen to be formed.

[0027] (3) Add 0.1mol / L PdCl to the system 2 Anaerobic aqueous solution 1.5mi, Pd 2+ with Fe 2+ The molar ratio of the mixture is 0.03%, and it is stirred while adding to form a Pd / FHC system.

[0028] (4) Take the prepared Pd / FHC and add it to the wastewater containing refractory pollutants, the dosage is 100mg / L (based on iron content), stir and react for 30min, then take s...

Embodiment 2

[0030] (1) Weigh 63mg of Na 2 SO 3 Dissolve in 500ml of water from which dissolved oxygen has been removed to form an aqueous sodium sulfite solution with a molar concentration of 1.0mmol / L, and add 25mg of cobalt chloride. Then weigh 139g of FeSO 4 ·7H 2O was added to the solution and stirred slowly until the ferrous sulfate was completely dissolved. Add 10mg / L of anionic polyacrylamide as a dispersant.

[0031] (2) Add 10 mol / L NaOH solution dropwise to the above solution, and stir while adding dropwise, so that the pH value of the system reaches 11, and an obvious dark green precipitate is seen to be formed.

[0032] (3) Add 0.1mol / L PdCl to the system 2 0.5ml anaerobic aqueous solution, Pd 2+ with Fe 2+ The molar ratio of the mixture is 0.01%, and it is stirred while adding to form a Pd / FHC system.

[0033] (4) Take the prepared Pd / FHC mixture and add it to 2,5-dibromoaniline wastewater containing 50mg / L, the dosage of Pd / FHC is 150mg / L (based on iron content), and...

Embodiment 3

[0037] (1) Weigh 100.8mg of Na 2 SO 3 Dissolve in 1000ml of water from which dissolved oxygen has been removed to form an aqueous sodium sulfite solution with a molar concentration of 0.8mmol / L, and add 30mg of cobalt chloride. Then take by weighing the FeCl of 127g Join in this solution, stir at a slow speed, until ferrous sulfate dissolves completely. Dosing 30mg / L of anionic polyacrylamide as a dispersant.

[0038] (2) Add 2 mol / L of Ca(OH) dropwise to the above solution 2 Solution was added dropwise while stirring, so that the pH value of the system reached 8, and an obvious dark green precipitate was formed.

[0039] (3) Add 0.1mol / L of KPdCl to the system 6 Anaerobic aqueous solution, Pd 2+ with Fe 2+ The molar ratio of the mixture is 0.02%, and it is stirred while adding to form a Pd / FHC system.

[0040] (4) Take the prepared Pd / FHC mixture and add it to 2,5-dibromoaniline wastewater containing 200mg / L, the dosage of Pd / FHC is 80mg / L (based on iron content), and ...

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Abstract

The invention relates to a method for removing a pollutant in water by a palladium-catalyzed polyhydroxy ferrous-reduced method, which is characterized in that a palladium chloride solution is added in a polyhydroxy ferrous (FHC) system, a chemical deposition mode is used to form a Pd / FHC redox system, the reduction performance of FHC is increased, a sodium hydrosulphite solution and a cobaltous chloride solution are added, so that the activity state of ferroporphyrin in the system can be kept, the concerted catalysis effect of Pd and Co can be performed, and the capability of FHC for reducing and conversing the pollutant can be increased. Compared with the prior art, the method for removing pollutant in water is in favor of increasing the reduction activity of FHC, and the prepared FHC system particles are uniform and stable, the reduction performance of FHC can be performed, more pollutant can be reduced and conversed by FHC, and an application of the FHC in treatment of difficultly degraded waste water can be promoted.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to a palladium-catalyzed method for reducing and removing pollutants in water by polyhydric ferrous ferrous. Background technique [0002] With the development of the chemical industry and the increase in the types of industrial products, there are more and more types of toxic and harmful pollutants in wastewater, such as chlorinated organic compounds, nitroaromatic compounds, brominated organic compounds, etc. Toxic and refractory organic pollutants not only have high biological toxicity, but also are easy to accumulate in organisms, persist in the environment, and can migrate long distances in the environment, causing serious impacts on human health and the environment. The control technologies for toxic organic substances mainly include physical, biological and chemical treatment methods. Due to the high toxicity of toxic pollutants, large molecular w...

Claims

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Application Information

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IPC IPC(8): C02F1/70B22F9/16C02F101/36C02F101/38C02F101/16
Inventor 吴德礼冯勇王权民马鲁铭
Owner TONGJI UNIV
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