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Preparation method of heavy metal copper and cadmium biochar adsorbent and product thereof

A technology of biochar and heavy metals, applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of cumbersome process, consumption of large phosphoric acid and hydrochloric acid, high raw materials, etc., and achieve the preparation process Simple, high adsorption efficiency, large adsorption effect

Inactive Publication Date: 2014-12-24
SICHUAN AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN 101716491 discloses a method for preparing a heavy metal adsorbent by carbonizing lake bottom mud. The adsorbent prepared by the method is dried, activated (physical and chemical methods), carbonized, and cleaned (hydrochloric acid and deionized water) from lake bottom mud. and grinding, the process is extremely cumbersome, and a large amount of phosphoric acid and hydrochloric acid are consumed in this process, which increases production costs and produces a large amount of acidic waste liquid
CN 102389776 discloses a metal adsorbent, which is prepared by using inorganic minerals modified by surfactants as a carrier and loading organic complexing agents. However, the adsorbent also requires more cost in the production process Expensive raw materials, not conducive to large-area use
CN 103055819 discloses a metal adsorbent, and its heavy metal adsorbent is a composite of graphite oxide and oligomeric 3-aminopropyltriethoxysilane. This method also has the problems of complicated process and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The earthworm feces were air-dried to make the water content 4% of the total weight to obtain dried earthworm feces; the dried earthworm feces were ground and sieved to select earthworm feces particles with a particle size of 0.15-0.20 mm; and then the obtained earthworm feces particles were placed In the carbonization furnace, nitrogen is used as the protective gas, and the anaerobic carbonization is carried out at 400°C, and the carbonization time is 0.5h, to obtain the heavy metal copper and cadmium biochar adsorbent.

[0026] To 50ml Cu with concentrations of 20ppm, 50ppm, 80ppm, 100ppm, 150ppm, 200ppm 2+ And Cd 2+ Add 0.1g of the adsorbent prepared in Example 1 to the solution, shake it at 120 rpm for 24h on a constant temperature shaker at 25°C, filter it with a 0.45μm filter membrane, and measure the remaining adsorbate by atomic absorption spectrophotometer concentration. According to the measured results, the concentration of the solution before and after ads...

Embodiment 2

[0028] Air-dry the earthworm feces so that the water content is less than 3% of the total weight to obtain dried earthworm feces; the dried worm feces are ground and sieved to select earthworm feces particles with a particle size of 0.40-0.45mm; and then the resulting worm feces particles Placed in a carbonization furnace, using nitrogen as a protective gas, conduct anaerobic carbonization at 400°C for 1 hour to obtain heavy metal copper and cadmium biochar adsorbents.

[0029] To 50ml Cu with concentrations of 20ppm, 50ppm, 80ppm, 100ppm, 150ppm, 200ppm 2+ And Cd 2+ Add 0.1g of the adsorbent prepared in Example 2 to the solution, shake on a constant temperature shaker at 25°C at 120 revolutions / min for 24 hours, filter by a 0.45 μm filter membrane, and measure the remaining adsorbate by atomic absorption spectrophotometer concentration. According to the measured results, the concentration of the solution before and after adsorption is compared to obtain Cu 2+ And Cd 2+ Equi...

Embodiment 3

[0031] The earthworm feces were air-dried to make the water content 4% of the total weight to obtain dried earthworm feces; the dried earthworm feces were ground and sieved to select the earthworm feces particles with a particle size of 0.20-0.25mm; and then the obtained earthworm feces particles were placed In the carbonization furnace, nitrogen is used as the protective gas, and the anaerobic carbonization is carried out at 400°C, and the carbonization time is 1h, to obtain the heavy metal copper and cadmium biochar adsorbent.

[0032] To 50ml Cu with concentrations of 20ppm, 50ppm, 80ppm, 100ppm, 150ppm, 200ppm 2+ And Cd 2+ The adsorbent prepared in Example 3 was added to the solution. After shaking at 120 revolutions / min for 24 hours on a constant temperature shaker at 25°C, it was filtered with a 0.45 μm filter membrane and the remaining concentration of adsorbate was measured by an atomic absorption spectrophotometer. According to the measured results, the concentration...

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Abstract

The invention discloses a preparation method of a heavy metal copper and cadmium biochar adsorbent and a product thereof. The adsorbent which has good adsorbing capacity for the heavy metal copper and cadmium is obtained through the following steps: air drying, drying and screening earthworm excrement, and then performing high temperature carbonization on the earthworm excrement under oxygen-free environment. Biochar produced by the preparation method has the advantages of simple preparation technology, low cost, large adsorbing capacity and high adsorbing efficiency.

Description

Technical field [0001] The invention relates to the technical field of biochar adsorbent preparation, in particular to a preparation method and product of heavy metal copper and cadmium biochar adsorbent. Background technique [0002] For a long time, the treatment of polluted water bodies has attracted much attention. The treatment of water bodies polluted by heavy metals is one of the key concerns. Among them, copper and cadmium are common elements in heavy metal wastewater, and they have the characteristics of easy enrichment and strong toxicity. When the body's intake of copper and cadmium exceeds the standard, it will cause the degeneration of human hemoglobin and the occurrence of hemolytic anemia; Liver damage can lead to chronic and active hepatitis; it can cause cranial nerve tissue lesions, frequent cerebellar mobilization and Parkinson’s syndrome; cause kidney failure and uremia, and its environmental hazards should not be underestimated and need to be resolved. At p...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/62
Inventor 沈飞王章鸿郭海燕杨刚彭宏张延宗邓仕槐伍钧
Owner SICHUAN AGRI UNIV
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