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Method for synthesizing high-efficiency adsorbent by using low-grade magnesite through one-pot method

An adsorbent and magnesite technology, applied in the field of adsorbent materials, can solve the problems of limiting the application of magnesite and increasing the cost, etc.

Pending Publication Date: 2021-04-13
YINGKOU INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional process of adding magnetic elements to adsorbents increases the cost accordingly
In addition to containing a large amount of magnesium oxide, low-grade magnesite also contains high content of acid-soluble iron, calcium, manganese and other elements and acid-insoluble slag, which seriously limits the application of magnesite. These elements and substances are also plant Important trace elements for growth

Method used

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  • Method for synthesizing high-efficiency adsorbent by using low-grade magnesite through one-pot method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Impregnation: Use nitric acid solution to react with 88g of low-grade magnesite powder, control pH=7 to obtain a turbid solution, add 120g of crushed peanut shells to the turbid solution, and immerse at 25°C for 8 hours;

[0021] (2) Water removal: the mixture was further dried in an oven at 80°C to remove water, and the precursor was obtained for future use.

[0022] (3) Pyrolysis: the obtained precursor is placed in a 550°C atmosphere furnace for high temperature treatment for 2 hours;

[0023] (4) Washing: After the material drops to room temperature, wash with deionized water to remove impurities;

[0024] (5) Drying: Remove moisture in a drying oven at 120°C to obtain a composite adsorbent.

[0025] Take 0.1g composite adsorbent for adsorption of 300mg / L, 200mL potassium dihydrogen phosphate-containing solution adsorption, the adsorption capacity of potassium dihydrogen phosphate is 580mg P / g, after adsorption, the adsorbent is filtered, dried and then applied...

Embodiment 2

[0027] (1) Impregnation: use sulfuric acid solution to react with 88g of low-grade magnesite powder, control the pH=6.5 to obtain a turbid solution, add 100g of crushed peanut shells to the turbid solution, and immerse at 25°C for 8 hours;

[0028] (2) Dehydration: the mixture is further dried in an oven at 90°C to remove moisture to obtain a precursor for later use.

[0029] (3) Pyrolysis: the obtained precursor is placed in a 600°C atmosphere furnace for high temperature treatment for 1.5 hours;

[0030] (4) Washing: After the material drops to room temperature, wash with deionized water to remove impurities;

[0031] (5) Drying: Remove moisture in a drying oven at 120°C to obtain a composite adsorbent.

[0032] The composite adsorbent is used to adsorb 300mg / L and 200mL potassium dihydrogen phosphate solution, and the adsorption capacity of potassium dihydrogen phosphate is 563mg P / g. After adsorption, the adsorbent is filtered, dried and then applied to soybean crops. Co...

Embodiment 3

[0034] (1) Impregnation: Use nitric acid solution to react with 88g of low-grade magnesite powder, control pH = 8 to obtain a cloudy solution, add 100g of crushed peanut shells to the cloudy solution, and soak at 25°C for 8 hours;

[0035] (2) Water removal: the mixture was further dried in an oven at 150°C to remove water to obtain a precursor for later use.

[0036] (3) Pyrolysis: the obtained precursor is placed in an 800°C atmosphere furnace for high temperature treatment for 3 hours;

[0037] (4) Washing: After the material drops to room temperature, wash with deionized water to remove impurities;

[0038] (5) Drying: Remove moisture in a drying oven at 120°C to obtain a composite adsorbent.

[0039] The composite adsorbent is used to adsorb 300mg / L and 200mL potassium dihydrogen phosphate solution, and the adsorption capacity of potassium dihydrogen phosphate is 532mg P / g. After adsorption, the adsorbent is filtered, dried and then applied to soybean crops. Compared wi...

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Abstract

The invention discloses a method for synthesizing a high-efficiency adsorbent by using low-grade magnesite through a one-pot method, and belongs to the field of adsorption materials. Based on the factors that low-grade magnesite contains many impurity components, is high in chemical activity, is a necessary element for plant growth and the like, acid-soluble metal impurities and acid-insoluble slag in the low-grade magnesite are combined with biomass charcoal to prepare the slag and biomass charcoal double-carrier composite metal oxide adsorbent. The magnesium element and excellent phosphorus directional adsorption performance of various impurities are utilized, the biomass charcoal is used as a necessary element for plant growth and is used for adsorbing phosphorus-containing wastewater, the adsorbed adsorbent can be used as a fertilizer, and reuse of phosphorus in the wastewater in the field of fertilizers can be realized. The method is simple to operate and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of adsorbent materials, in particular to a method for synthesizing a high-efficiency adsorbent by utilizing low-grade magnesite in one pot. Background technique [0002] As the world population continues to increase, the environmental water pollution caused by the increase in food production and the use of a large amount of fertilizers is becoming increasingly serious. When the phosphorus in the water increases to 0.2mg / L, the water will become eutrophic, and the plants in the water will grow out of control, causing fish and other organisms died in large numbers. Therefore, the effective separation of phosphorus in water is crucial to the food security of people all over the world. [0003] At present, the existing water phosphorus treatment methods include precipitation, adsorption, membrane separation and other technologies. Among them, the adsorption method has the advantages of easy separation and low cost and is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/02B01J20/06B01J20/20B01J20/305B01J2220/42B01J2220/4806B01J2220/4825C02F1/281C02F2101/105
Inventor 梁海刘海燕陈红杨云洪邓信忠郭宝龙黄璐茜卢美
Owner YINGKOU INST OF TECH
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