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Method for using zinc electroplating sludge to prepare azo dyes photocatalyst

An azo dye, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, water pollutants, etc., to achieve strong oxidation performance and improve efficiency

Active Publication Date: 2015-08-26
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the problems that azo dyes urgently need to be treated and zinc electroplating sludge urgently needs safe treatment and utilization, the present invention intends to use zinc electroplating sludge to prepare photocatalysts to degrade azo dyes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: (1) get 500g zinc electroplating sludge from zinc electroplating sludge factory, sludge is in 105 o Bake at C for 24 hours, weigh 10g, and grind it through a 100-mesh sieve; (2) Soak the particles in 1L of nitric acid solution with pH=4, and then adjust the pH with nitric acid solution with pH=3 to stabilize the pH of the solution at 4; (3) Pour out the supernatant, precipitate it with ammonia water with pH = 11, and adjust the pH to 10; (4) Wash the sediment and the bottom sludge after pouring out the supernatant three times, and in the second The two were mixed and stirred in water for 24h; (5) the obtained solid was mixed at 105 o C drying, 400~600 in an atmosphere containing 5%~20% oxygen o For the roasting of C, weigh 0.2g of the prepared material and put it into 500mL, 10mg / L Congo red. Under the irradiation of 500W xenon lamp, the degradation rate of Congo red reaches 50.1% after 2h.

Embodiment 2

[0014] Embodiment two: (1) get 400g zinc electroplating sludge from zinc electroplating sludge factory, sludge is in 105 o Bake at C for 24 hours, weigh 5g, and grind it through a 100-mesh sieve; (2) Soak the particles in 25mL of nitric acid solution with pH=4, and then adjust the pH with nitric acid solution with pH=3 to stabilize the pH of the solution at 4; (3) Pour out the supernatant, precipitate it with ammonia water with pH = 11, and adjust the pH to 10; (4) Wash the sediment and the bottom sludge after pouring out the supernatant three times, and put it in 25mL The two were mixed and stirred in secondary water for 24h; (5) the obtained solid was heated at 105 o C drying, 400~600 in an atmosphere containing 5%~20% oxygen o For the roasting of C, weigh 0.2g of the prepared material and put it into 500mL, 10mg / L methyl orange. Under the irradiation of 500W xenon lamp, the degradation rate of Congo red reaches 62.3% after 2h.

Embodiment 3

[0015] Embodiment three: (1) get 600g zinc electroplating sludge from zinc electroplating sludge factory, sludge is in 105 o Bake at C for 24 hours, weigh 15g, and grind through a 100-mesh sieve; (2) Soak the particles in 1.5L of nitric acid solution with pH=4, and then adjust the pH with nitric acid solution with pH=3 to stabilize the pH of the solution In 4; (3) Pour out the supernatant, precipitate it with ammonia water with pH = 11, and adjust the pH to 10; (4) Wash the sediment and the bottom sludge after pouring out the supernatant three times, in 150mL Mix and stir the two in secondary water for 24h; (5) put the obtained solid at 105 o C drying, 400~600 in an atmosphere containing 5%~20% oxygen o For the roasting of C, weigh 0.2g of the prepared material and put it into 500mL, 10mg / L methyl orange. Under the irradiation of 500W xenon lamp, the degradation rate of Congo red reaches 71.4% after 2h.

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Abstract

The invention relates to a method for using zinc electroplating sludge to prepare an azo dyes photocatalyst. The method comprises the steps: using the electroplating sludge as the raw material, preparing the photocatalyst by roasting, and catalyzing and degrading the azo dyes in the visible light. The polluted water can be directly discharged into the river after treated to reach the discharge standard. The method is capable of effectively recycling the electroplating sludge, and simply, high-efficiently and safely treating the polluted water of the azo dyes.

Description

technical field [0001] The invention relates to a method for preparing a photocatalyst for degrading azo dyes, in particular to a method for preparing a photocatalyst for degrading azo dyes using zinc electroplating sludge. technical background [0002] Azo dyes are dyes containing an azo group in the dye molecule. Its synthesis method is simple and its structure is variable, so it is the most diverse category of dyes, accounting for more than 50% of synthetic dyes. It is widely used in the dyeing and printing of various natural and synthetic fibers, and is also used in paints, plastics, Coloring of rubber etc. Azo dyes have complex structures and high chemical stability, making them an important source of water pollution. At home and abroad, using reaction and catalysis to decompose azo dyes is a generally accepted method for controlling azo dye pollution. Therefore, finding an economical and efficient azo dye reaction and catalyst has become a possible way to prevent and...

Claims

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Application Information

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IPC IPC(8): B01J23/06C02F1/30C02F101/38
Inventor 赵子力岳阳左康苏明舟张醒张佳钱光人
Owner SHANGHAI UNIV
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