Porous heavy metal ion adsorbent based on biochar and preparation method of porous heavy metal ion adsorbent

A technology of biomass carbon and heavy metals, applied in the field of porous materials, can solve the problems of difficult separation and difficult recovery, and achieve the effects of industrialized production, easy operation of the production process, and easy availability of raw materials.

Active Publication Date: 2018-04-24
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It solves the shortcomings of difficult separation and difficult recovery of biochar materials in the actual applicatio...

Method used

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  • Porous heavy metal ion adsorbent based on biochar and preparation method of porous heavy metal ion adsorbent
  • Porous heavy metal ion adsorbent based on biochar and preparation method of porous heavy metal ion adsorbent
  • Porous heavy metal ion adsorbent based on biochar and preparation method of porous heavy metal ion adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of a porous heavy metal adsorbent based on biochar:

[0029] (1) Mix 35 g of biochar with 10 g of kaolin and 5 g of hydroxyapatite powder.

[0030] (2) Add 9 g of acrylamide and an appropriate amount of N,N'-methylenebisacrylamide to 50 mL of water.

[0031] (3) Mix the powder obtained in step 1 with the gel liquid obtained in step 2, and put it into a planetary ball mill to grind and make slurry to obtain a slurry with a solid content of 50 wt%.

[0032] (4) Take out the slurry obtained in step 3, add a certain amount of surfactant sodium lauryl sulfate, and then stir vigorously with a mechanical stirrer until the volume of the slurry expands to twice the original state.

[0033] (5) Under continuous stirring conditions, add an appropriate amount of N,N,N',N'-tetramethylethylenediamine dropwise to the slurry with a dropper, and then add 10 mL of 10 wt% sodium sulfate.

[0034] (6) Quickly inject the slurry obtained in step 5 into a mold of 1.7*1.7*1.7cm ...

Embodiment 2

[0037] In this example, a porous adsorbent based on biochar is used to adsorb and remove heavy metal lead, and the steps are as follows:

[0038] Put 0.2 g of the porous adsorbent obtained in Example 1 into 500 mL of 50 mg / L lead solution for adsorption at room temperature; take a sampling point at regular intervals and monitor for 24 hours; the collected samples are measured by ICP-OES, and the material The unit adsorption capacity of the material, and with time as the abscissa, the lead adsorption kinetic curve of the material is made; the data calculated by fitting are as follows:

[0039] The lead adsorption performance of table 1 example 1 gained porous adsorbents.

[0040]

Embodiment 3

[0042] In this example, a porous adsorbent based on biochar is used to adsorb and remove heavy metal lead, and the steps are as follows:

[0043] Put 0.1 g of the porous adsorbent obtained in Example 1 into 250 mL of 50-250 mg / L lead solution for adsorption at room temperature; each concentration is sampled at 24 hours; the collected samples are measured by ICP-OES, and the unit adsorption capacity of the material is calculated , and taking the equilibrium concentration as the abscissa, the lead adsorption thermodynamic curve of the material is made; the data calculated by fitting are as follows:

[0044] The lead adsorption performance of table two example 1 gained porous adsorbent

[0045]

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PUM

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Abstract

The invention discloses a porous heavy metal ion adsorbent based on biochar and a preparation method of the porous heavy metal ion adsorbent. The porous material comprises active components and a support, wherein the active components comprise biochar and hydroxyapatite; the support adopts kaolin as a structure promoter. The main preparation process of the adsorbent comprises steps of slurry preparation, slurry foaming, gelation, slurry injection into a mold, blank demolding and blank drying. The method has the following characteristics: the porous adsorbent is prepared from the biochar as anactive component and an inorganic compound as the support, waste is recycled, heavy metals can be removed, the adsorbent has the characteristic of being easy to recycle, and cyclic utilization of theadsorbent is realized. By means of the rich porous structure, mass transfer resistance is reduced, adsorption capacity and adsorption efficiency for the heavy metals are increased, and the adsorbent has good application prospect and environmental effect.

Description

technical field [0001] The invention belongs to the field of adsorption and removal of heavy metals from waste water and natural water bodies, and in particular relates to a method for forming heavy metal removal biochar into a lightweight and high-porosity porous material. Background technique [0002] The development and progress of industry have caused the discharge of industrial waste gas and wastewater to destroy the normal ecological environment, especially the discharge of heavy metals has caused a serious threat to human health. Heavy metals are very harmful to water bodies, and lead is a heavy metal that is very harmful to the environment and human body. In recent years, with the development of human activities and industries, lead pollution has become more and more serious, and when the lead content discharged into the environment exceeds the normal range acceptable to the environment, it will lead to deterioration of the environmental quality and cause harm to hum...

Claims

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Application Information

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IPC IPC(8): B01J20/30B01J20/28B01J20/20C02F1/28C02F101/20
CPCB01J20/20B01J20/28011B01J20/28054B01J20/28057C02F1/28C02F1/283C02F2101/20
Inventor 付明来左玮琦崔浩杰
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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