Preparation method of defluorination adsorbent based on flour

An adsorbent, flour technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc. High performance and simple preparation process

Active Publication Date: 2020-10-27
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the physical activation method has little effect on the preparation of biomass-based activated carbon, but in order to obtain a developed and stable pore structure, chemical activation is usually required in the process of preparing activated carbon from biomass materials, and the chemical activation method has a greater impact on its preparation.

Method used

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  • Preparation method of defluorination adsorbent based on flour
  • Preparation method of defluorination adsorbent based on flour
  • Preparation method of defluorination adsorbent based on flour

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Effect of the volume ratio of methane and argon on the adsorption performance of the prepared fluorine removal adsorbent

[0019] Preparation of fluorine-removing adsorbent: as figure 1 As shown, the flour is ground for 1 hour, and then subjected to low-temperature plasma irradiation for 1 hour to obtain carbonized powder, wherein the applied voltage of low-temperature plasma irradiation is 3kV, and the operating atmosphere is a mixed gas of methane and argon, and the volume ratio of methane and argon is 2.5:100, 3.5:100, 4.5:100, 5:100, 15:100, 25:100, 26:100, 28:100, 30:100; Dissolve cerium sulfate in water to prepare 20g / L cerium sulfate Aqueous solution, according to the solid-to-liquid ratio of carbonized powder and cerium sulfate aqueous solution 0.4:1 (g:mL), mix carbonized powder and cerium sulfate aqueous solution, soak for 2 hours, separate solid from liquid, dry the solid at 50°C, and grind for 0.5 hour to obtain Cerium-loaded carbide powder; low-temperature...

Embodiment 2

[0027] Influence of Concentration of Cerium Sulfate Aqueous Solution on the Adsorption Performance of Prepared Fluorine Removal Adsorbent

[0028] Preparation of fluorine-removing adsorbent: Grind the flour for 2 hours, and then irradiate with low-temperature plasma for 2 hours to obtain carbonized powder. The volume ratio of argon is 25:100; dissolve cerium sulfate in water to prepare 10g / L, 15g / L, 18g / L, 20g / L, 40g / L, 60g / L, 62g / L, 65g / L, 70g / L cerium sulfate aqueous solution, according to the solid-to-liquid ratio of carbide powder and cerium sulfate aqueous solution 0.8:1 (g:mL), mix the carbonized powder and cerium sulfate aqueous solution, soak for 4 hours, separate the solid and liquid, and dry the solid at 100°C , grind for 1 hour to get cerium-loaded carbonized powder; irradiate cerium-loaded carbonized powder with low-temperature plasma for 2 hours to obtain fluorine-removing adsorbent, wherein the action voltage of low-temperature plasma irradiation is 16.5kV, and t...

Embodiment 3

[0035] Influence of Water Vapor Humidity on the Adsorption Performance of Prepared Fluoride Removal Adsorbent

[0036] Preparation of fluorine-removing adsorbent: Grind flour for 3 hours, and then irradiate with low-temperature plasma for 3 hours to obtain carbonized powder. The gas volume ratio is 25:100; dissolve cerium sulfate in water to prepare 60g / L cerium sulfate aqueous solution, and mix the carbonized powder and cerium sulfate aqueous solution according to the solid-to-liquid ratio of carbonized powder and cerium sulfate aqueous solution 1.2:1 (g:mL) , soaked for 6 hours, separated from solid and liquid, dried the solid at 150°C, and ground for 1.5 hours to obtain cerium-loaded carbide powder; irradiated cerium-loaded carbide powder with low-temperature plasma for 3 hours to obtain a fluorine-removing adsorbent, in which low-temperature plasma The irradiation voltage is 30kV, the action atmosphere is water vapor, and the water vapor humidity is 30%RH, 40%RH, 50%RH, 60...

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Abstract

The invention discloses a preparation method of a defluorination adsorbent based on flour. The preparation method comprises the following steps: (1) carrying out low-temperature plasma irradiation onthe flour to obtain carbonized powder; (2) mixing the carbonized powder with a cerous sulfate aqueous solution, soaking, carrying out solid-liquid separation, drying the solid part, and grinding to obtain cerium-loaded carbonized powder; and (3) carrying out low-temperature plasma irradiation on the cerium-loaded carbonized powder to obtain the defluorination adsorbent. The low-temperature plasmatechnology is applied to convert flour into the defluorination adsorbent so that the selectivity of the carbon precursor is broadened, and the method is not limited to selection of biomass materials with certain hardness or relatively stable plant cell wall structures any more; the preparation process is simple, and a stable high-temperature environment does not need to be maintained in the preparation process; the prepared fluorine removal adsorbent is wide in pH application range (1-13) and high in fluorine ion selectivity, and the maximum adsorption capacity can reach 246mg/g.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-removing adsorbent, in particular to a preparation method of a flour-based fluoride-removal adsorbent. Background technique [0002] Fluorine is one of the essential trace elements for the human body and plays an important role in maintaining normal physiological activities of the human body. A moderate amount of fluoride in drinking water is beneficial to human health, but long-term drinking of water with excess fluoride can easily cause symptoms such as diffuse bone sclerosis, bone softening, and nervous system damage. Fluorine-containing wastewater mainly comes from fluorine chemical industry, electroplating, metal processing and other industries. The existence of high fluorine in water has caused great harm to human production and living environment. [0003] Commonly used defluoridation methods include adsorption, ion exchange, electrodialysis and membrane treatment, among which adsorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/14
CPCB01J20/20C02F1/283C02F2101/14Y02W10/37
Inventor 黄涛宋东平吴美蓉金俊勋杜晶刘龙飞周璐璐
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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