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Straw-based amphoteric dye adsorbent as well as preparation method and application thereof

An adsorbent and straw technology, which is applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of inability to decolorize dyes, single function of adsorbents, etc., and achieve good environmental friendliness and adsorption time. Short, low-cost effects

Inactive Publication Date: 2021-06-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the function of traditional adsorbents is usually relatively single, and generally only has a good adsorption effect on one type of dye, and cannot achieve a good decolorization effect on different types of dyes

Method used

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  • Straw-based amphoteric dye adsorbent as well as preparation method and application thereof
  • Straw-based amphoteric dye adsorbent as well as preparation method and application thereof
  • Straw-based amphoteric dye adsorbent as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Such as Figure 1-2 As shown, a straw-based amphoteric dye adsorbent uses straw as a polymer skeleton, and through graft substitution and graft copolymerization, carboxyl and tertiary amino groups are grafted on the cellulose molecular chain of straw to form both There are anionic and cationic straw-based amphoteric dye sorbents.

[0051] The surface of the straw-based amphoteric dye adsorbent has a pore structure, and a large number of anion and cationic groups are distributed on the straw cellulose molecular chain.

[0052] The adsorption principle of the amphoteric dye adsorbent is:

[0053] The pore structure of the straw-based amphoteric dye adsorbent plays a role of physical adsorption in the adsorption process; at the same time, the carboxyl group in the adsorbent can be deprotonated and converted into carboxylate anion under weak alkaline conditions, which has good electrostatic properties for cationic dyes. Attraction, ion exchange and other chemical adsorpti...

Embodiment 2

[0094] After peeling the corn stalks, wash them three times with deionized water, dry them in an oven at 60°C, and then pulverize them to obtain straw powder, then put the straw powder in a three-necked bottle, and add 2% H 2 o 2 aqueous solution, and use 20% NaOH aqueous solution to adjust the pH of the system to 12.5, control the reaction temperature to 60°C, react for 5 hours under stirring conditions, filter and wash the residue with deionized water to obtain pretreated corn stover cellulose. Take 0.3g of corn stalk cellulose, add 6mL of ethanol aqueous solution with a volume fraction of 85%, add 0.18g of powdered NaOH solid in two times according to the ratio of mass ratio of 3:1, after adding alkali for the first time, stir well and put Put it into a constant temperature water bath at 30°C for alkalization. After reacting for 60 minutes, 0.36 g of chloroacetic acid was dissolved in 10 mL of 85% ethanol aqueous solution, and then added dropwise while stirring, and the et...

Embodiment 3

[0096] After peeling the corn stalks, wash them three times with deionized water, dry them in an oven at 60°C, and then pulverize them to obtain straw powder, then put the straw powder in a three-necked bottle, and add 2% H 2 o 2 aqueous solution, and use 20% NaOH aqueous solution to adjust the pH of the system to 12.5, control the reaction temperature to 60°C, react for 5 hours under stirring conditions, filter and wash the residue with deionized water to obtain pretreated corn stover cellulose. Take 0.3g of corn stalk cellulose, add 6mL of ethanol aqueous solution with a volume fraction of 85%, add 0.18g of powdered NaOH solid in two times according to the ratio of mass ratio of 3:1, after adding alkali for the first time, stir well and put Put it into a constant temperature water bath at 30°C for alkalization. After reacting for 60 minutes, 0.36 g of chloroacetic acid was dissolved in 10 mL of 85% ethanol aqueous solution, and then added dropwise while stirring, and the et...

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Abstract

The invention relates to the technical field of dye adsorbents, in particular to a straw-based amphoteric dye adsorbent as well as a preparation method and an application thereof. The preparation method comprises the following steps: by taking straw as a polymer skeleton, firstly reacting with haloacetic acid in an ethanol-water mixed system, grafting carboxyl on a cellulose molecular chain of the straw to prepare carboxymethyl straw cellulose, then carrying out graft copolymerization on the carboxymethyl straw cellulose and dialkylaminoethyl methacrylate, and grafting tertiary amino on a cellulose molecular chain of the straw, and forming the straw-based amphoteric adsorbent with both anions and cations. The method is simple to operate, mild in reaction condition and short in synthesis path, the used main raw material is waste straw, and the cost is low, so that the obtained product has good environmental friendliness, can be used as an adsorbent for treating anionic dyes and cationic dyes, has the characteristics of strong adsorption capacity, high decolorization rate, good selectivity, short adsorption time, wide application range and the like, is beneficial to industrial practical application, and has important significance in the field of environmental protection.

Description

technical field [0001] The invention relates to the technical field of dye adsorbents, in particular to a straw-based amphoteric dye adsorbent and its preparation method and application. Background technique [0002] With the rapid development of my country's textile printing and dyeing industry, dye wastewater has become one of the most important sources of water pollution today. Dye wastewater mainly comes from the processes of scouring, dyeing, printing and finishing in printing and dyeing processing. It usually contains undyed dyes, dyeing auxiliaries, inorganic salts and other substances. It has complex composition, high chroma, high COD and BOD concentrations, There are many difficult biodegradable substances. If the dye wastewater produced by industry is directly discharged into rivers, lakes and other environments, it will not only cause pollution of natural water bodies, but also affect the photosynthesis of water plants and cause damage to the ecological environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/30C02F103/30
CPCB01J20/24C02F1/286C02F2101/308C02F2103/30
Inventor 单斌崔瑞林谭伟强马继平
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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