Resin-based nano composite material, preparation method and method for deeply removing copper- citric acid from water

A technology of nanocomposite materials and composite materials, applied in the field of wastewater treatment, to achieve the effects of large specific surface area, high adsorption capacity, and strong adsorption selectivity

Inactive Publication Date: 2019-08-27
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the limitation problem in the prior art that it is difficult to remove heavy metal-complexes by using cation exchange resin to support hydrated

Method used

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  • Resin-based nano composite material, preparation method and method for deeply removing copper- citric acid from water
  • Resin-based nano composite material, preparation method and method for deeply removing copper- citric acid from water
  • Resin-based nano composite material, preparation method and method for deeply removing copper- citric acid from water

Examples

Experimental program
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Example Embodiment

[0054] Example 1

[0055] The resin-based nanocomposite material of this embodiment is synthesized according to the following steps:

[0056] 1) Take 10 g of zirconium oxychloride and dissolve it in an acidic aqueous solution with pH=1.5; make zirconium exist in the form of ions.

[0057] 2) Take the tertiary aminated styrene-divinylbenzene copolymer sphere and add it to the solution system prepared in step 1). The mass ratio of the copolymer sphere to the zirconium oxychloride is 1:1, and then the water bath is heated to 70 ℃, open; stirring continuously for 12 hours at 300rpm;

[0058] Adjusting the mass ratio of copolymer sphere and zirconium oxychloride is to control the loading of nano-hydrated zirconium oxide, and opening and heating are to promote the hydrolysis and concentration of zirconium salt;

[0059] 3) After step 2) is completed, take out the copolymerized spheres, air dry, and then transfer to a NaOH solution with a mass concentration of 10%. The copolymerized spheres a...

Example Embodiment

[0068] Example 2

[0069] The method for deep removal of Cu-citric acid complex from water in Example 2 includes the following steps:

[0070] (a) Prepare simulated wastewater containing Cu-citric acid complex, the initial copper concentration is 2.5 mg / L, the molar concentration of citric acid is 5 times the molar concentration of copper, and the pH of the raw water is adjusted to 6.0 after filtration;

[0071] (b) Simulate the adsorption tower device, fill the tower with 5 mL (wet volume) of resin-based nanocomposite material, and pass the Cu-citric acid complex wastewater through the adsorption tower at a temperature of 10°C with a flow rate of 10 BV / h. The resin-based nanocomposite material used in this step (b) has a matrix macroporous D301 weakly basic ion exchange resin with a particle size distribution between 0.6 and 0.9 mm, a pore size distribution between 1 and 80 nm, and contains abundant Nanoporous structure and tertiary amine groups, nano-hydrated zirconia particles in...

Example Embodiment

[0074] Example 3

[0075] The method for deep removal of Cu-citric acid complex from water in Example 3 includes the following steps:

[0076] (a) Prepare simulated wastewater containing Cu-citric acid complex, the initial copper concentration is 5.0 mg / L, the molar concentration of citric acid is 10 times the molar concentration of copper, and the pH of the raw water is adjusted to 6.0 after filtration;

[0077] (b) Simulated adsorption tower device, filled with 5 mL (wet volume) of resin-based nanocomposite material, and passed the Cu-citric acid complex wastewater through the adsorption tower at a temperature of 30°C with a flow rate of 1 BV / h. The resin-based nanocomposite material used in this step (b) has a matrix macroporous D301 weakly basic ion exchange resin with a particle size distribution between 0.6 and 0.9 mm, a pore size distribution between 1 and 80 nm, and contains abundant Nanoporous structure and tertiary amine groups, nano-hydrated zirconia particles in the resi...

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Abstract

The invention discloses a resin-based nano composite material, a preparation method and a method for deeply removing copper- citric acid from water, and belongs to the technical field of wastewater treatment. A matrix of the composite material is a macroporous D301 weakly basic ion exchange resin, and nano hydrated zirconia particles are uniformly distributed in pores. The method for the treatmentof wastewater comprises the following steps: (1) filtering Cu-citric acid wastewater, and adjusting the pH value of filtrate; (2) enabling the filtrate to pass through an adsorption tower filled withthe resin-based nano composite material; (3) stopping adsorption when the concentration of copper in effluent reaches a breakthrough point, and desorbing and regenerating the resin-based nano composite material; and (4) after the composite material is cleaned to neutral, transforming the composite material for cyclic use. The invention combines a preconcentration effect of a polymer matrix with the performance of nano hydrated zirconia for selectively removing heavy metal complexes from the water, so that the adsorption capacity and the selectivity of the material for the heavy metal complexes are effectively improved, and the concentration of the heavy metals in the effluent is stable and meets the discharging standard.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a resin-based nanocomposite material, a preparation method and a method for deeply removing copper-citric acid in water. Background technique [0002] Heavy metal wastewater is one of the most harmful industrial wastewater to human health and the ecological environment. It mainly comes from electroplating, circuit boards, surface treatment, tanning, printing and dyeing, papermaking, chemical industry, machinery manufacturing and other industries. Since citric acid is widely used as a complexing agent in the production process of these industries, heavy metals in wastewater will form stable complexes with citric acid in addition to ionic state. Compared with free heavy metals, such complex heavy metals have changes in chemical properties and environmental behavior, which brings new problems and challenges to the treatment of heavy metal wastewater. [000...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/32B01J20/30C02F1/28C02F101/20
CPCB01J20/261B01J20/28019B01J20/3071B01J20/3236C02F1/288C02F2101/20C02F2303/16
Inventor 花铭杨博文黄萍潘丙才单超张炜铭吕路高冠道
Owner NANJING UNIV
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