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Preparation method and use of sulfydryl cotton stalk bark

A technology of mercapto cotton and cotton stalk skin, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of low adsorption capacity, large pH impact, etc., and achieve high adsorption efficiency, cost saving, selective effect

Inactive Publication Date: 2012-03-28
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

He used nitrogen-containing chelating agents to chemically modify cotton stalks and adsorb metal ions in the water system, so the pH effect is relatively large and the adsorption capacity is also low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Cotton stalk bark pretreatment: soak cotton stalks in water at room temperature for 1-3 days, peel, wash, remove impurities, dry, then pulverize, and sieve through a 20-40 mesh sieve;

[0014] (2) Preparation of degummed cotton stalk husks: Soak the crushed cotton stalk husks at 35% of the total mass with 0.3mol / L urea solution and 1% hydrogen peroxide mixed solution at room temperature for 30min, wash with water and use 0.1mol / L L of H 2 SO 4 Immerse in the solution for 2 minutes; boil with 0.4mol / L NaOH solution for 60 minutes, add distilled water continuously during the boiling period to keep the solution volume constant, wash with deionized water to pH 7 after cooling, and dry at 60°C after suction filtration. Obtain the degummed cotton stalk skin.

[0015] (3) In a stoppered Erlenmeyer flask, add 20 mL of thioglycolic acid (filter out the precipitate) and 16 mL of tetrahydrofuran, add 1 mL of acetic anhydride, add two drops of concentrated sulfuric acid, mix ...

Embodiment 2

[0017] (1) Cotton stalk bark pretreatment: soak cotton stalks in water at room temperature for 1-3 days, peel, wash, remove impurities, dry, then pulverize, and sieve through a 20-40 mesh sieve;

[0018] (2) Preparation of degummed cotton stalk husks: Soak the crushed cotton stalk husks at 30% of the total mass with a mixed solution of 0.2 mol / L urea and 2% hydrogen peroxide at room temperature for 40 minutes, wash with water and use a concentration of 0.1 mol / L L of H 2 SO 4 Immerse in the solution for 2 minutes; boil with a concentration of 0.5mol / L NaOH solution for 50 minutes, add distilled water continuously during the boiling period to keep the solution volume constant, wash with deionized water to pH 7 after cooling, and dry at 70°C after suction filtration. Obtain the degummed cotton stalk skin.

[0019] (3) In a stoppered Erlenmeyer flask, add 30mL of thioglycolic acid (filter out the precipitate) and 25mL of tetrahydrofuran, add 1mL of acetic anhydride, add two dro...

Embodiment 3

[0021] (1) Cotton stalk bark pretreatment: soak cotton stalks in water at room temperature for 1-3 days, peel, wash, remove impurities, dry, then pulverize, and sieve through a 20-40 mesh sieve;

[0022] (2) Preparation of degummed cotton stalk husks: Soak the crushed cotton stalk husks at 32% of the total mass with a mixed solution of 0.2 mol / L urea and 1% hydrogen peroxide at room temperature for 50 minutes, wash with water and use a concentration of 0.1 mol / L L of H 2 SO 4Immerse in the solution for 4 minutes; boil with a concentration of 0.3mol / L NaOH solution for 70 minutes, add distilled water continuously during the boiling period to keep the solution volume constant, wash with deionized water to pH 7 after cooling, and dry at 60°C after suction filtration. Obtain the degummed cotton stalk skin.

[0023] (3) In a stoppered Erlenmeyer flask, add 25mL of thioglycolic acid (filter out the precipitate) and 25mL of tetrahydrofuran, add 1mL of acetic anhydride, add two drop...

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PUM

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Abstract

The invention discloses a preparation method and use technique of sulfydryl cotton stalk bark. The method is characterized by comprising: adding 48 to 52 mass percent of thioglycolic acid, 36 to 46 mass percent of tetrahydrofuran, 2 to 4 mass percent of acetic anhydride, 0.2 to 0.5 mass percent of concentrated sulfuric acid and 12 to 20 mass percent of degummed cotton stalk bark into a triangularflask with a plug, plugging the triangular flask, stirring and refluxing at 55 to 65 DEG C for 3 to 4 hours, washing with deionized water, filtering under vacuum, till the filtrate is neutral, washing with a small amount of ethanol, drying in an oven at 35 DEG C, and thus obtaining the sulfydryl cotton stalk bark. The sulfydryl cotton stalk bark has high metal iron absorbability, can absorb and elute various metal ions in water, the absorption efficiency and speed of the sulfydryl cotton stalk bark are high, and the physical, chemical and mechanical properties of the sulfydryl cotton stalk bark are stable, the sulfydryl cotton stalk bark can be used in a wide pH value range, the high regenerability of the sulfydryl cotton stalk bark makes the repeated use times of the sulfydryl cotton stalk bark 10 percent higher than that of sulphydryl cotton, the waste of cotton stalk is utilized, cost is saved and environment pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and relates to a preparation method and application technology of mercapto cotton stalk skins, in particular to a method for preparing mercapto cotton stalk skins and an application technology for the adsorption of metal ions in water bodies. Background technique [0002] my country is a large cotton-producing country in the world, with more than 500,000 hectares of cotton planted. Cotton stalk is the waste of cotton farmers after picking cotton, and cotton stalk bark is a kind of excellent bast growing on the surface of cotton stalk. The cotton stalk produced per hectare is about 4000kg, and the cotton stalk skin accounts for about 26%. Rich. As agricultural waste, cotton stalks are mostly burned as fuel in rural areas, and the rest cannot be used and turned into waste, which is a pity. Making full use of these can create considerable economic benefits. We use cotton husk cellulose...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 许崇娟李慧芝庄海燕卢燕
Owner UNIV OF JINAN
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