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Preparation of 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent

A technology of mercaptopyrimidine and cotton stalk bark, which is applied in the field of environment and chemistry, can solve the problems of difficult solid-liquid separation of adsorbents and hinder the progress of adsorption technology, and achieve good physical and chemical stability, excellent mechanical strength, and good desorption performance.

Inactive Publication Date: 2017-06-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, there are many shortcomings in the adsorption method. The difficulty of solid-liquid separation of the adsorbent has always been a major problem hindering the progress of adsorption technology. Therefore, in recent years, many scholars have devoted themselves to the study of magnetic adsorbents and applied them in adsorption separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of oxidized cotton stalk husk: In the reactor, add potassium permanganate: 7g, deionized water: 76 mL, stir to dissolve, add sulfuric acid: 4 mL, mix well, then add pretreated cotton stalk husk: 10g , soaked at room temperature for 6 h, boiled for 10 min, washed with deionized water until neutral after cooling, separated from solid and liquid, and dried to obtain oxidized cotton stalk bark;

[0025] (2) Preparation of magnetic cotton stalk skin: In the reactor, add deionized water: 63 mL, ferric ion: 5g, ferrous ion: 2g, neodymium ion: 12g, sodium tetraborate: 5g, after ultrasonic dissolution , add oxidized cotton stalk skin: 13g, adjust the pH between 10 and 12 with NaOH under stirring, raise the temperature to 90±2°C, keep stirring, and reflux for 6.5 hours. The whole reaction process is carried out under argon atmosphere, and the reaction is over After cooling to room temperature, solid-liquid separation, washing, drying, to obtain magnetic cotton sta...

Embodiment 2

[0029] (1) Preparation of oxidized cotton stalk husk: In the reactor, add potassium permanganate: 10g, deionized water: 74 mL, stir to dissolve, add sulfuric acid: 5.5 mL, mix well, then add pretreated cotton stalk husk: 6g , soaked at room temperature for 6 h, boiled for 10 min, washed with deionized water until neutral after cooling, separated from solid and liquid, and dried to obtain oxidized cotton stalk bark;

[0030] (2) Preparation of magnetic cotton stalk skin: In the reactor, add deionized water: 66 mL, ferric ion: 4g, ferrous ion: 3g, neodymium ion: 8g, sodium tetraborate: 4g, after ultrasonic dissolution , add oxidized cotton stalk skin: 15g, adjust the pH between 10 and 12 with NaOH under stirring, raise the temperature to 90±2°C, keep stirring, and reflux for 6 hours. The whole reaction process is carried out in an argon atmosphere. After the reaction , cooled to room temperature, solid-liquid separation, washing, drying, to obtain magnetic cotton stalk skin;

...

Embodiment 3

[0034] (1) Preparation of oxidized cotton stalk husk: In the reactor, add potassium permanganate: 5g, deionized water: 80 mL, stir to dissolve, add sulfuric acid: 5mL, mix well, then add pretreated cotton stalk husk: 9g, Soak at room temperature for 6 hours, boil for 10 minutes, wash with deionized water until neutral, separate solid and liquid, and dry to obtain oxidized cotton stalk bark;

[0035] (2) Preparation of magnetic cotton stalk skin: In the reactor, add deionized water: 60mL, ferric ion: 6g, ferrous ion: 2g, trivalent neodymium ion: 13g, sodium tetraborate: 6g, after ultrasonic dissolution, Add oxidized cotton stalk skin: 10g, adjust the pH between 10 and 12 with NaOH under stirring, raise the temperature to 90±2°C, keep stirring, and reflux for 7 hours. The whole reaction process is carried out in an argon environment. After the reaction, cooling to room temperature, solid-liquid separation, washing, and drying to obtain magnetic cotton stalk skins;

[0036] (3) ...

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Abstract

The invention discloses a preparing method of a 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent. The preparing method of the 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent is characterized in that cotton-straw bast is firstly oxidized to obtain oxidized cotton-straw bast; then the oxidized cotton-straw bast is magnetized and aminated to obtain aminated magnetic cotton-straw bast; then materials, by mass fraction, of 76-82% of tetrahydrofuran, 2-5% of 2-Mercaptopyrimidine and 10-16% of aminated magnetic cotton-straw bast are added into a reactor, then the mixture is stirred, and 2-6% of fumaryl chloride is added dropwise, the sum of all the component is one hundred percent, stirring and a refluxing reaction are conducted at the constant temperature of 90+ / -2 DEG C for four hours, after cooling, the mixture is then washed to be neutral through deionied water, and solid-liquid separation and drying are conducted to obtain the 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent. The 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent has a very high adsorption capacity on silver, is high in preferential adsorption of silver, low in cost, and high in mechanical strength; meanwhile, the 2-Mercaptopyrimidine modified magnetic cotton-straw bast adsorbent can be repeatedly used for more than eight times, and the adsorbent can be easily separated.

Description

technical field [0001] The invention relates to a preparation method of a modified magnetic biosorbent, in particular to a preparation method of a 2-mercaptopyrimidine modified magnetic cotton stalk bark adsorbent and an application technology for silver adsorption, belonging to the field of environment and chemical technology. Background technique [0002] Due to the needs of industrial development and life, many heavy metals are discharged into the atmosphere and water, endangering the ecological environment and human health. The wide application of silver and silver-containing products in the fields of electronic electroplating, photosensitive materials, chemical industry and scientific research has produced a large amount of Silver-containing waste liquid not only causes serious environmental pollution, but also causes a large waste of silver resources. Therefore, the removal and recovery of silver in waste liquid containing silver ions has very important research and pr...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C22B3/24C22B11/00
CPCB01J20/24C22B3/24C22B11/042Y02P10/20
Inventor 李慧芝李晓峰许崇娟
Owner UNIV OF JINAN
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