Nano-composite adsorbent preparation method directly processing waste water containing chrome tanning

A nano-composite, adsorbent technology, applied in chemical instruments and methods, animal processing wastewater treatment, adsorbed water/sewage treatment, etc., can solve the problems of difficulty in stability, complex operation, high investment and operating costs, and achieve strong adsorption capacity The effect of low economic cost and stable operation

Active Publication Date: 2013-12-18
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high-concentration chromium-containing sewage, tannery usually adopts the alkali precipitation method to treat it. This method has a better treatment effect. The removal rate of total chromium in the treated tannery sewage can reach more than 98%, but the total chromium in the treated wastewater The concentration of chromium is generally within 2.0~10 mg / L, especially for the main tanning water and retanning and dyeing wastewater that are reused more times. The production of hydrolyzable collagen substances in medium can cause complexation between chromium and these substances, or be oxidized into chromate, etc., making it difficult to stably reach the national standard of total Cr concentration ≤ 1.5 mg / L by conventional alkali precipitation method
For low-concentration heavy metal wastewater, currently commonly used treatment methods include adsorption method and ion exchange method. Due to the interference of high salinity and high organic matter in wastewater, these methods cannot selectively adsorb chromium. It is difficult to implement in tanning enterprises due to the problems of high operating cost and complicated operation
[0004] With the development of nanotechnology, the development of nanomaterials in leather chemicals has become a research hotspot. Organic-inorganic nanocomposites have shown special advantages in the specific adsorption of chromium, but the application of nanocomposites in leather tanning There are currently no related products and applications for the advanced treatment of wastewater, but with the help of the excellent performance of nano-leather chemicals, it provides a possibility for the advanced treatment of low-concentration chromium-containing tanning wastewater

Method used

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  • Nano-composite adsorbent preparation method directly processing waste water containing chrome tanning

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Nano titanium dioxide (TiO 2 ) into a four-neck flask, add 100 ml of deionized water to disperse to make a solution with a mass concentration of 5%, stir at 800 r / min for 60 min at a constant temperature of 30 °C, and let it stand overnight. Next day, at 50 °C , add 20g of diallyl dimethyl ammonium chloride (DMDAAC), fully stir, ultrasonic treatment, set aside.

[0015] 2. Put 22g of the mixture of acrylamide (AM) and hydroxyethyl acrylate (HEA) into the constant pressure dropping funnel, the mass ratio of AM:HEA is 1:0.7, add 10g of methacrylic acid (MAA) into the second drop In the liquid funnel, the initiator potassium persulfate was added to the third dropping funnel, the amount added was 5% of the total mass of the monomer, the temperature was raised to 80°C, the stirring speed was 200 r / min, and the monomer and the initiator were added dropwise at the same time. The agent was added dropwise in 1 hour, and the reaction was carried out at a constant temperature ...

Embodiment 2

[0019] 1. Nano titanium dioxide (TiO 2 ) into a four-neck flask, add 100 ml of deionized water to disperse to make a solution with a mass concentration of 8%, stir at 800 r / min for 60 min at a constant temperature of 30 °C, and let it stand overnight. Next day, at 50 °C , add 17g of diallyl dimethyl ammonium chloride (DMDAAC), fully stir, ultrasonic treatment, set aside.

[0020] 2. Put 19g of the mixture of acrylamide (AM) and hydroxyethyl acrylate (HEA) into the constant pressure dropping funnel, the mass ratio of AM:HEA is 1:1, add 7g of methacrylic acid (MAA) into the second drop funnel In the liquid funnel, the initiator potassium persulfate was added to the third dropping funnel, the amount added was 3% of the total mass of the monomer, the temperature was raised to 70°C, the stirring speed was 200 r / min, and the monomer and the initiator were added dropwise at the same time. Agent, 1h dropwise completed, constant temperature reaction 3h.

[0021] 3. After the reaction...

Embodiment 3

[0024] 1. Nano titanium dioxide (TiO 2 ) into a four-neck flask, add 100 ml of deionized water to disperse, and make a solution with a mass concentration of 6%. Stir at a constant temperature of 30°C for 60 min at 800 r / min, stand overnight, and the next day, at 50°C , add 22g of diallyl dimethyl ammonium chloride (DMDAAC), fully stir, ultrasonic treatment, set aside.

[0025] 2. Put 25g of the mixture of acrylamide (AM) and hydroxyethyl acrylate (HEA) into the constant pressure dropping funnel, the mass ratio of AM:HEA is 1:1.1, add 12g of methacrylic acid (MAA) into the second drop funnel In the liquid funnel, the initiator potassium persulfate was added to the third dropping funnel, the amount added was 4% of the total mass of the monomer, the temperature was raised to 90°C, the stirring speed was 200 r / min, and the monomer and the initiator were added dropwise at the same time. The agent was added dropwise in 1 hour, and the reaction was carried out at a constant temperat...

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Abstract

The invention discloses a nano-composite adsorbent preparation method directly processing waste water containing chrome tanning. Low-concentration heavy metal waste water is commonly processed by an adsorption method, an ion exchange method and the like currently, and the methods selectively adsorb chrome. According to the nano-composite adsorbent preparation method direct processing the waste water containing chrome tanning, diallyl dimethyl ammonium chloride, methacrylic acid, acrylamide, hydroxyethyl acrylate and nanometer titania are used as raw materials, and aqueous solution free radicals are polymerized to prepare vinyl-based polymer / nanometer titania P (DMDACC-MAA-AM-HEA) / TiO2 nano composite adsorbent. According to the nano-composite adsorbent preparation method directly processing the waste water containing chrome tanning, the adsorbent can directly process low-concentration chrome tanning waste water, chrome removal rate can be 98.6 %, the adsorbent has wide pH value adaptability, has highly-selective adsorbability to Cr, is not prone to being polluted by other pollutant in the waste water, and is large in adsorption capacity, high in processing efficiency, and particularly suitable for processing acidic low-concentration chrome tanning waste water.

Description

technical field [0001] The invention relates to a preparation method of a nanocomposite adsorbent used for advanced treatment of leather chrome tanning wastewater, in particular to a preparation method of a nanocomposite adsorbent for directly treating chrome-containing tanning wastewater. Background technique [0002] Chrome tanning is currently the most mature tanning method with the most reliable product quality and the lowest cost in the leather industry[Rao J.R., Nair B.U.; Integration of chrome tanning and wet finishing process for making garment leathers. Journal of the American Leather Chemists Association 100 : 225-232, 2005.]. The annual processing capacity of the global leather industry is 15 million tons of skins, and about 90% of the finished leather is produced by chrome tanning [Fundamentals of leather manufacture. Cr 2 o 3 The content is generally 500~2000mg / L. Secondly, in the tanning and dyeing section, due to the high temperature under acidic condit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/28C08F220/06C08F226/02C08F2/10C08K3/22B01J20/26C02F1/28C02F103/24
Inventor 马宏瑞鄂涛畅浩
Owner SHAANXI UNIV OF SCI & TECH
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