A kind of iron base-bentonite/carbon composite porous material, its preparation method and application

A technology of porous materials and bentonite, which is applied in the field of environmental restoration, can solve the problems of large powder density differences, uneven dispersion, and coating in the skeleton, and achieve the effects of low production cost, uniform contact dispersion, and controllable structure

Active Publication Date: 2021-07-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of these methods are: the density difference between iron powder and other powders is large, and the dispersion is uneven; adding water to form requires precise control of the amount of water added, and pressing and forming can easily lead to iron powder being coated in the skeleton

Method used

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  • A kind of iron base-bentonite/carbon composite porous material, its preparation method and application
  • A kind of iron base-bentonite/carbon composite porous material, its preparation method and application
  • A kind of iron base-bentonite/carbon composite porous material, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] This example provides a method for preparing an iron-based-bentonite / carbon composite porous material, the specific preparation method of which is:

[0074] (1) prepare 2wt% sodium alginate solution as the dispersant of iron powder, the forming agent of pyrolysis precursor;

[0075] (2) 1 g of reduced iron powder with a size of 400 mesh, 3 g of bentonite and 20 mL of the solution described in step (1) were mechanically mixed for 35 min to obtain a pasty mixture;

[0076] (3) adding the pasty mixture described in step (2) into a 0.5 mol / L calcium ion solution by dripping it into a pyrolysis precursor solidified for 4 hours into a spherical shape;

[0077] (4) Place the pyrolytic precursor obtained in step (3) in an atmosphere furnace and roast in a nitrogen atmosphere. The calcination temperature was 600° C., the heating rate was 5° C. / min, and the calcination time was 2 hours to obtain an iron-based-bentonite / carbon composite porous material.

[0078] The iron-based-b...

Embodiment 2

[0081] This example provides the preparation method of iron-based-bentonite / carbon composite porous material, and its specific preparation method is:

[0082] (1) prepare 2wt% sodium alginate solution as the dispersant of iron powder, the forming agent of pyrolysis precursor;

[0083] (2) 1 g of reduced iron powder with a size of 400 mesh, 0.1 g of starch, 3 g of bentonite and 20 mL of the solution described in step (1) were mechanically mixed for 35 minutes to obtain a pasty mixture;

[0084] (3) adding the pasty mixture described in step (2) into a 0.5 mol / L calcium ion solution by dripping it into a pyrolysis precursor solidified for 4 hours into a spherical shape;

[0085] (4) Place the pyrolytic precursor obtained in step (3) in an atmosphere furnace and roast in a nitrogen atmosphere. The calcination temperature was 600° C., the heating rate was 5° C. / min, and the calcination time was 2 hours to obtain an iron-based-bentonite / carbon composite porous material.

[0086] ...

Embodiment 3

[0089] This example provides the preparation method of iron-based-bentonite / carbon composite porous material, and its specific preparation method is:

[0090] (1) prepare 2wt% sodium alginate solution as the dispersant of iron powder, the forming agent of pyrolysis precursor;

[0091] (2) 1g of reduced iron powder with a size of 400 mesh, 0.3g of starch, 3g of bentonite and 20mL of the solution described in step (1) were mechanically mixed for 35min to obtain a pasty mixture;

[0092] (3) adding the pasty mixture described in step (2) into a 0.5 mol / L calcium ion solution by dripping it into a pyrolytic precursor solidified for 4 hours into a spherical shape;

[0093] (4) Place the pyrolytic precursor obtained in step (3) in an atmosphere furnace and roast in a nitrogen atmosphere. The calcination temperature was 600° C., the heating rate was 5° C. / min, and the calcination time was 2 hours to obtain an iron-based-bentonite / carbon composite porous material.

[0094] The iron-...

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Abstract

The invention relates to an iron-based-bentonite / carbon composite porous material, its preparation method and application. The composite porous material includes a bentonite porous skeleton and iron powder and carbon distributed on the outer surface of the bentonite porous skeleton and the inner surface of pores. The composite porous material has controllable structure, high compressive strength and good stability, can effectively remove hexavalent chromium, and the removal rate can reach more than 85%. application prospects. The preparation method has a simple process, can realize regulation and control of the structure of the composite porous material through the cooperation of various raw materials and processes, and has the characteristics of low production cost and easy large-scale production.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to an iron-based-bentonite / carbon composite porous material, its preparation method and application. Background technique [0002] Environmental pollution has become the focus of attention, among which groundwater pollution is the most serious. Iron powder is a commonly used reducing agent because it can remove various pollutants (such as chromium, arsenic, cadmium, copper, and chlorine-containing organic compounds). Environmentally friendly, cheap and easy to get. In the past 20 years, iron powder has been widely used in groundwater and sewage treatment. However, the corrosion of iron powder and the deposition of iron hydroxide lead to the volume expansion of iron powder, the long-term activity of the reaction medium is reduced, and the permeability of the reaction wall is reduced. Therefore, it is necessary to fix and disperse the iron powder to prepare an iron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/30B01J20/20B01J20/30C02F1/28C02F1/70C02F103/06C02F101/22
CPCB01J19/30B01J20/02B01J20/12B01J20/20B01J20/3078B01J2219/30207B01J2219/30223C02F1/281C02F1/283C02F1/705C02F2101/22C02F2103/06
Inventor 屈敏陈辉霞王兴润黄涛李书鹏徐红彬
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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