Graphene oxide modified biochar composite as well as preparation method and application thereof

A composite material and biochar technology, applied in the field of materials and the environment, can solve the problems of no systematic research on methylene blue, no due research, no research on removing heavy metals, etc., to increase removal efficiency and adsorption capacity, biological The effect of low toxicity and simple synthesis method

Active Publication Date: 2015-11-18
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although the above-mentioned graphene-biochar composite material was successfully synthesized, the size of the synthesized composite material is relatively large, and it cannot form a nano-scale synthetic material. At the same time, there is no systematic research on the effect on the removal of methylene blue, especially no research on the use of this material. The Process of Removing Heavy Metals from Polluted Water by Composite Materials
[0005] Although some research results have been achieved in the application of biochar composite materials in the environmental field, the systematic research on the application of biochar composite materials in the environment is still in its infancy, especially the preparation and application of engineering biochar, which has not yet been obtained. due research

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  • Graphene oxide modified biochar composite as well as preparation method and application thereof
  • Graphene oxide modified biochar composite as well as preparation method and application thereof
  • Graphene oxide modified biochar composite as well as preparation method and application thereof

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Embodiment 1

[0049] A biochar composite material modified by graphene oxide of the present invention, comprising graphene oxide, biochar and chitosan, graphene oxide is bonded on the biochar by chitosan, and chitosan is distributed around the pore diameter of the biochar form a cylindrical stent structure. In the graphene oxide-modified biochar composite material, the diameter of the circumference of the formed cylindrical scaffold structure is distributed in the range of 400-600 nm.

[0050] A preparation method of the graphene oxide modified biochar composite material of the present embodiment, specifically comprising the following steps:

[0051] (1) Preparation of biochar: Dry 6.0g of sieved camphor wood sawdust (the particle size of camphor wood sawdust is 0.1-0.25mm) at 90°C, put it in a quartz tube, and then put the quartz tube into In a tube furnace, under a nitrogen atmosphere, the temperature was raised at a rate of 5 °C / min, and the biochar was obtained by slow pyrolysis at 600...

Embodiment 2

[0064] A biochar composite material modified by graphene oxide in Example 1 of the present invention removes Pb in water 2+ The application of Pb with the biochar in Comparative Example 1 2+ Compared with the effect, the specific application method is:

[0065] Set 8 pieces of 0.5m respectively 3 The processing pool, the Pb 2+ The aqueous solution with a concentration of 20.028 mg / L is discharged into the aforementioned treatment pool. Add the equivalent of Pb to the 8 processing pools 2+ Gross mass 10,20,30,40 times the graphene oxide modified biochar composite material in embodiment 1, and equivalent to Pb 2+ The biochar in Comparative Example 1 with a total mass of 10, 20, 30, and 40 times, after stirring for 4 hours, filter the treated aqueous solution with a filter membrane with a pore size of 0.22 microns, and detect Pb in the filtrate 2+ concentration. During the treatment, the pH of the aqueous solution was controlled to be 7.0, respectively. The experimental re...

Embodiment 3

[0073] A biochar composite material modified by graphene oxide in Example 1 of the present invention removes Pb in water 2+ By adjusting the adsorption time to investigate the effect of adsorption time on the removal of Pb in water by graphene oxide modified biochar composites 2+ Impact.

[0074] Set 2 pieces of 2m 3 processing pool, the Pb 2+ The aqueous solution with a concentration of 19.919 mg / L is discharged into the aforementioned treatment pool. Add Pb in the 2 treatment pools respectively 2+ The graphene oxide-modified biochar composite material in Example 1 and the biochar in Comparative Example 1 with a total mass of 23 times were stirred to keep pH=7.0, and samples were taken at 15, 30, 60, 120, 240, and 480 min respectively, and used Filter the aqueous solution with a pore size of 0.22 microns and detect Pb in the filtrate 2+ concentration. The test results are listed in Table 2.

[0075] Table 2: Adsorption time on adsorption of Pb by adsorbent 2+ Impact ...

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Abstract

The invention discloses graphene oxide modified biochar composite as well as a preparation method and an application thereof. The graphene oxide modified biochar composite comprises graphene oxide, biochar and chitosan, wherein graphene oxide is bonded on the biochar through chitosan to form a support structure. The preparation method comprises steps as follows: the biochar is prepared; the chitosan is dissolved in an acetic acid solution to form a chitosan and acetic acid mixed solution; the chitosan and acetic acid mixed solution and the graphene oxide are mixed to form a chitosan/graphene oxide mixed solution; the biochar is added to the chitosan/graphene oxide mixed solution and mixed, and the graphene oxide modified biochar composite is obtained. The graphene oxide modified biochar composite has the characteristics of high adsorption capacity, high adsorption efficiency and the like and can be applied to removal of Pb<2+> in water on a large scale.

Description

technical field [0001] The invention relates to the field of materials and the environment, in particular to a graphene oxide-modified biochar composite material and a preparation method thereof, and to the use of graphene oxide-modified biochar composite materials in treating Pb in water bodies 2+ Applications. Background technique [0002] In recent years, with the rapid development of the economy and the extensive use of chemical reagents in the industrial and agricultural fields, most of the surface water and groundwater in my country have been polluted to varying degrees, and the pollutants include heavy metals and organic substances. If the polluted water body is not treated or treated properly, it will cause serious harm to public health and the ecological environment. For example: the heavy metal lead ion (II) can not only widely exist in soil and surface water, but also circulate in groundwater. Can cause serious damage to the kidneys, central nervous system, repr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/62
Inventor 刘俊锋梁婕袁兴中曾光明董浩然武海鹏张长
Owner HUNAN UNIV
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