A kind of preparation method of magnetic straw cellulose dye adsorbent

A straw cellulose and adsorbent technology, applied in the field of preparation of magnetic straw cellulose dye adsorbent, can solve the problems of difficult solid-liquid separation, secondary pollution, etc., achieve improved compatibility, short life cycle chain, huge social effect of benefit

Active Publication Date: 2019-09-20
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The straw is pretreated and chemically oxidized to prepare aldehyde-based straw cellulose, and then KH550 modified magnetic nanoparticles, aldehyde-based straw cellulose, polyethyleneimine and glutaraldehyde are chemically cross-linked to prepare a Schiff-base cross-linked Structure and magnetic straw cellulose / polyethyleneimine dye adsorbent with various dye adsorption groups, modification of magnetic nanoparticles by silane coupling agent, improvement of compatibility between magnetic nanoparticles and polymer matrix, inhibition of magnetic nanoparticles Macroscopic phase separation with polymer matrix, realizing efficient magnetic intelligent separation of dye adsorption by magnetic straw cellulose adsorbent, better solving the shortcomings of ordinary dye adsorbents, such as difficult solid-liquid separation and easy to produce secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cut corn stalks into pieces, wash 5 times with deionized water, dry in an oven at 60°C, crush, sieve 200-mesh corn stalk powder, add 16g corn stalk powder and 6g sodium chlorite to 150mL pH=4 acetic acid-sodium acetate buffer solution, heated to 70°C, reacted for 4 hours, cooled to room temperature, filtered, washed with deionized water for 5 times, centrifuged, dried in an oven at 80°C, crushed to obtain pretreated corn stalks; 15g of pretreated corn The straw was added to 150mL of NaOH solution with a mass concentration of 5%, heated to 70°C, reacted for 4.5h, filtered, washed with deionized water for 5 times, and centrifuged to obtain pretreated corn stover cellulose; 25g of pretreated corn stover cellulose , 10g of sodium periodate and 200mL of deionized water were added to a three-necked flask, the temperature was raised to 50°C, and the reaction was carried out for 2.5 hours. The product was washed 5 times with deionized water, and centrifuged to obtain aldehyde-ba...

Embodiment 2

[0041] Cut wheat straw into pieces, wash with deionized water three times, dry in an oven at 80°C, crush, and sieve 150-mesh wheat straw powder, add 12g wheat straw powder and 3.5g sodium chlorite to 100mL pH = 5.5 acetic acid-sodium acetate buffer solution, heated up to 70°C, reacted for 4 hours, cooled to room temperature, filtered, washed 5 times with deionized water, centrifuged, dried in an oven at 80°C, crushed to obtain pretreated wheat straw; 12g of pretreated Wheat straw was added to 100mL NaOH solution with a mass concentration of 10%, heated to 80°C, reacted for 3h, filtered, washed with deionized water for 5 times, and centrifuged to obtain pretreated wheat straw cellulose; 12g of pretreated wheat straw cellulose , 6g of sodium periodate and 100mL of deionized water were added into a three-necked flask, heated to 50°C, and reacted for 2.5 hours. The product was washed 5 times with deionized water, and centrifuged to obtain aldehyde-based wheat straw cellulose.

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Embodiment 3

[0045] Cut sorghum straw into pieces, wash with deionized water for 3 times, dry in an oven at 60°C, crush, sieve 150-mesh sorghum straw powder, add 30g sorghum straw powder and 10g sodium chlorite to 200mL pH=3.5 acetic acid-sodium acetate buffer solution, heated up to 90°C, reacted for 2 hours, cooled to room temperature, filtered, washed 5 times with deionized water, centrifuged, dried in an oven at 80°C, and crushed to obtain pretreated sorghum straw; 15g of pretreated sorghum The straw was added to 150mL of NaOH solution with a mass concentration of 5%, heated to 60°C, reacted for 6h, filtered, washed with deionized water for 5 times, and centrifuged to obtain pretreated sorghum straw cellulose; 20g of pretreated sorghum straw cellulose, Add 8 g of sodium periodate and 150 mL of deionized water into a three-necked flask, raise the temperature to 40° C., react for 3 hours, wash the product with deionized water for 5 times, and centrifuge to obtain aldehyde-based sorghum str...

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Abstract

The invention relates to a preparation method of a magnetic straw cellulose dye adsorbent. Straw is pre-processed through sodium chlorite and sodium hydroxide and oxidizes through sodium periodate to obtain aldehyde group straw cellulose. An improved chemical co-precipitation method is used to prepare magnetic nano particles, surface modification is conducted on the magnetic nano particles through a silane coupling agent KH550 to obtain KH550 modified magnetic nano particles, and finally, the KH550 modified magnetic nano particles, polyethyleneimine and glutaraldehyde are subjected to a cross-linking reaction to prepare the magnetic straw cellulose dye adsorbent with a schiff base cross-linking structure and multiple adsorption groups; the saturation magnetization is 10-30 emu / g, remanent flux density and coercive field strength all approach to zero, the paramagnetism and the magnetic responsiveness are provided, for a dye aqueous solution with an initial concentration of 100-1000 mg / L, the dye adsorption capacity reaches 50-300 mg / g, adsorption equilibrium can be reached in 60-150 min, the dye adsorption capacity after 5-time recycling is more than 75% of the first adsorption capacity, and the method can be widely applied in dye adsorption and separation, pollution abatement of dye waste water and the like.

Description

[0001] 1. Technical field [0002] The invention relates to a method for preparing a magnetic straw cellulose dye adsorbent. The magnetic straw cellulose dye adsorbent prepared by the invention is suitable for the adsorption and separation of dyes, and can be widely used in dye adsorption, dye separation and purification, and dye environmental pollution control, etc. . [0003] 2. Background technology [0004] Dye wastewater mainly comes from dye and dye intermediate production industries and textile, leather, paper, rubber, plastic, cosmetics, pharmaceutical and food industries, with complex composition, large changes in water quantity and quality, high chroma, COD and BOD concentration It is one of the most difficult industrial wastewater to treat due to the characteristics of high concentration, high suspended solids, and many refractory biodegradable substances. In addition, dye wastewater not only has obvious chroma, which affects the senses, but also contains toxic and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F101/30
Inventor 万涛陈巧和熊静唐利廖玲王艳芬龚诗意侯鹏
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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