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Cyclodextrin-modified hypercrosslinked resin and method for adsorbing and recovering aniline compounds in industrial wastewater by using same

An aniline compound, cyclodextrin technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problem of increasing the difficulty and cost of secondary treatment, a large amount of sludge, nitrobenzene Compound mineralization and other problems, to achieve good adsorption and desorption effects, no secondary pollution, easy storage and transportation

Active Publication Date: 2017-12-05
HUIZHOU RES INST OF SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of this method is that a large amount of sludge will be generated during the purification process of aniline wastewater, which increases the difficulty and cost of secondary treatment for enterprises
As another example, Publication Nos. CN104261517A and CN104355464A respectively adopt iron-carbon micro-electrolysis and catalyzed iron-in-micro-electrolysis technology to process nitrobenzene and aniline waste water. Nitrobenzene compounds are completely mineralized into small inorganic molecules, which can only be used in combination with other processes as a pretreatment method for wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of hypercrosslinked resin adsorption material (1):

[0030] Take polystyrene-chloromethylstyrene resin (10 g) in a 100 ml three-neck round bottom flask, add 50 mL of 1,2-dichloroethane to swell overnight. The catalyst zinc chloride (1.2 g) was added to the swollen product, and stirred slowly until the catalyst was completely dissolved. Within 1.5 h, the temperature was slowly raised to 115 °C, and the reaction was continued at this temperature for 12 h. After the reaction was completed, the product was filtered and washed, placed in a vacuum oven, and dried under reduced pressure at 80 °C for 12 h to obtain the final product hypercrosslinked resin. Dissolve β-CD (0.7048 g) in 25 mL N’N-dimethylformamide, add organic base pyridine and stir for 1 h to ensure that the system is evenly mixed. Then 2.50 g of the above hypercrosslinked resin product was added to the system, and the reaction was continued at 70 °C for 12 h. After filtering and washing, vacuum-dr...

Embodiment 2

[0032] Preparation of hypercrosslinked resin adsorption material (2):

[0033] Take polystyrene-chloromethylstyrene resin (10 g) in a 100 ml three-neck round bottom flask, add 50 mL of 1,2-dichloroethane to swell overnight. Catalyst ferric chloride (1.2 g) was added to the swollen product and stirred slowly until the catalyst was completely dissolved. Within 1.5 h, the temperature was slowly raised to 115 °C, and the reaction was continued at this temperature for 12 h. After the reaction was completed, the product was filtered and washed, placed in a vacuum oven, and dried under reduced pressure at 80 °C for 12 h to obtain the final product hypercrosslinked resin. Take β-CD (2.2166 g) and dissolve it in 25 mL N’N-dimethylformamide, add an organic base and stir N-methylmorpholine for 1 h to ensure that the system is evenly mixed. Then 2.50 g of the above hypercrosslinked resin product was added to the system, and the reaction was continued at 70 °C for 12 h. After filtering an...

Embodiment 3

[0035] Treatment of aniline-containing wastewater solutions:

[0036] 50 mL of 1000 mg / L aniline wastewater solution was placed in a 250 mL conical flask, then 0.05 g of the adsorption material of Example 1 was dropped into the conical flask, placed at 20°C, and oscillated at a speed of 200 rpm shaken in a full-temperature culture shaker for 24 h. After shaking, the supernatant was taken, and the concentration of aniline in the wastewater solution before and after adsorption was analyzed by a UV-visible spectrophotometer. It is known from the results that the adsorption capacity of the adsorbent to aniline is 149 mg / g; then, it is eluted with absolute ethanol, and the content of aniline in the desorption solution is measured using a UV-visible light spectrophotometer. It can be seen from the results that the elution rate is 96%.

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Abstract

The invention discloses cyclodextrin-modified hypercrosslinked resin and a method for adsorbing and recovering aniline compounds in industrial wastewater by using the same. The method is used for adsorbing aniline compounds such as aniline, p-toluidine, p-chloroaniline and p-aminobenzoic acid in wastewater by taking the synthesized cyclodextrin-modified polystyrene-chloromethylstyrene hypercrosslinked resin as an adsorption material, and the maximum adsorption capacities can respectively reach 149mg / g, 198mg / g, 294mg / g and 623mg / g. Experimental results show that the adsorption capacity is obviously higher than the maximum adsorption capacities of adsorption materials such as activated carbon, coal ash and modified zeolite to the aniline compounds. The method disclosed by the invention has the advantages such as simple material preparation process, repeated utilization, mild adsorption condition, energy saving, environment friendliness and low cost.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for absorbing and recovering aniline compounds in industrial waste water and the preparation of the absorbing material. Background technique [0002] Water is the source of life, the total amount of water resources in the world is 1.35 billion km 3 , of which only 2.5% is fresh water, and most of them are solid glacier water and deep groundwater. The fresh water that humans can directly use is less than only 0.3%. Moreover, with the development of the economy, the pollution of fresh water resources by domestic sewage and industrial wastewater is becoming more and more serious, so the problem of water pollution control has become a common concern of human beings all over the world. Industrial wastewater is the main source of water pollution. There are millions of toxic compounds in industrial wastewater, including aniline compounds, which are widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L25/08C08L5/16B01J20/26C02F1/28C02F101/38
CPCB01J20/267C02F1/285C02F2101/38C08J3/24C08J3/246C08J2325/08C08J2405/16
Inventor 纪红兵李秋如杨祖金
Owner HUIZHOU RES INST OF SUN YAT SEN UNIV
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