A yak dung-based hydrothermal carbon was prepared by a method similar to that of example 1, except that the reaction temperature of the hydrothermal reaction was set to 250 ℃ and the reaction time was set to 1 hour, to obtain a yak dung-based hydrothermal carbon (labeled as C2501).

By using N₂As a comparative test, the atmosphere of the above reaction was changed to N₂To obtain N₂The obtained yak dung-based hydrothermal charcoal (marked as N2501) is prepared under the atmosphere.

Respectively in the presence of CO₂Under an atmosphere and in N₂And testing the specific surface area of the yak dung-based hydrothermal carbon prepared in the atmosphere. The test results show that in CO₂The specific surface area of the yak dung-based hydrothermal charcoal (C2501) prepared in the atmosphere is 58.25m²·g^-1(ii) a In N₂The specific surface area of the yak dung-based hydrothermal charcoal (N2501) prepared in the atmosphere is 44.24m²·g^-1。

Example 4

A yak dung-based hydrothermal carbon was prepared by a method similar to that of example 1, except that the reaction temperature of the hydrothermal reaction was set to 250 ℃ and the reaction time was set to 2 hours, to obtain a yak dung-based hydrothermal carbon (labeled as C2502).

By using N₂As a comparative test, the atmosphere of the above reaction was changed to N₂To obtain N₂The obtained yak dung-based hydrothermal charcoal (marked as N2502) is prepared under the atmosphere.

Respectively in the presence of CO₂Under an atmosphere and in N₂And testing the specific surface area of the yak dung-based hydrothermal carbon prepared in the atmosphere. The test results show that in CO₂The specific surface area of the yak-dung-based hydrothermal charcoal (C2502) prepared in the atmosphere is 60.13m²·g^-1(ii) a In N₂The specific surface area of the yak dung-based hydrothermal charcoal (N2502) prepared in the atmosphere is 43.24m²·g^-1. Compared with in N₂Preparing yak dung-based hydrothermal charcoal (N2502) in CO atmosphere₂The specific surface area of the yak dung-based hydrothermal charcoal (C2502) prepared in the atmosphere is increased39.06％。

Table 2 shows the reaction temperature of the hydrothermal reaction at 250 ℃ in CO₂And N₂And comparing the specific surface areas of the yak excrement-based hydrothermal carbon prepared in the atmosphere.

TABLE 2

Example 5

A yak dung-based hydrothermal carbon is prepared by a method similar to that in example 1, except that the reaction temperature of the hydrothermal reaction is set to 300 ℃, and the reaction time is set to 1h, so that the yak dung-based hydrothermal carbon (marked as C3001) is obtained.

By using N₂As a comparative test, the atmosphere of the above reaction was changed to N₂To obtain N₂The obtained yak dung-based hydrothermal charcoal (marked as N3001) is prepared under the atmosphere.

Respectively in the presence of CO₂Under an atmosphere and in N₂And testing the specific surface area of the yak dung-based hydrothermal carbon prepared in the atmosphere. The test results show that in CO₂The specific surface area of the yak dung-based hydrothermal carbon (C3001) prepared in the atmosphere is 3.62m²·g^-1(ii) a In N₂The specific surface area of the yak dung-based hydrothermal carbon (N3001) prepared in the atmosphere is 2.14m²·g^-1。

Example 6

A yak dung-based hydrothermal carbon is prepared by a method similar to that in example 1, except that the reaction temperature of the hydrothermal reaction is set to 300 ℃, and the reaction time is set to 2 hours, so that the yak dung-based hydrothermal carbon (marked as C3002) is obtained.

By using N₂As a comparative test, the atmosphere of the above reaction was changed to N₂To obtain N₂Preparing the obtained yak dung-based hydrothermal charcoal (marked as N3002) in the atmosphere.

Respectively in the presence of CO₂Under an atmosphere and in N₂And testing the specific surface area of the yak dung-based hydrothermal carbon prepared in the atmosphere. The test results show that in CO₂Under atmosphereThe specific surface area of the obtained yak-dung-based hydrothermal charcoal (C3002) is 2.54m²·g^-1(ii) a In N₂The specific surface area of the yak dung-based hydrothermal carbon (N3002) prepared in the atmosphere is 1.52m²·g^-1。

Table 3 shows the reaction temperature of the hydrothermal reaction at 300 ℃ in CO₂And N₂And comparing the specific surface areas of the yak excrement-based hydrothermal carbon prepared in the atmosphere.

TABLE 3

Fig. 2 is a Fourier infrared spectrum analysis of yak dung and yak dung-based hydrothermal carbon provided by the embodiment of the invention. As shown in FIG. 2, in CO₂The infrared spectrogram of functional group of yak dung-based hydrothermal carbon prepared under atmosphere is shown at wavenumber of 865cm^-1The yak excrement-based hydrothermal charcoal contains higher aromatic substances, and has higher stability.

Embodiments of the invention utilize CO₂Carrying out hydrothermal carbonization treatment on yak excrement to obtain yak excrement-based hydrothermal carbon. The yak excrement-based hydrothermal carbon prepared by the embodiment of the invention has higher specific surface area and stability. When the reaction temperature of the hydrothermal reaction is 250 ℃ and the reaction time is 2 hours, the specific surface area of the prepared yak-dung-based hydrothermal carbon reaches 60.13m²·g^-1Relative to in N₂The specific surface area of the yak dung-based hydrothermal carbon prepared in the atmosphere is obviously improved.

The yak excrement-based hydrothermal carbon prepared by the embodiment of the invention is applied to soil improvement, can play a good role in improving soil fertility and nutrient utilization efficiency, and can realize high-efficiency utilization of yak excrement.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

Translated fromChinese

1.一种利用CO₂制备牦牛粪基水热炭的方法，其特征在于，包括：1. a method of utilizing CO₂ to prepare yak dung-based hydrothermal carbon, is characterized in that, comprising:

提供风干、粉碎后的牦牛粪；Provide air-dried and crushed yak dung;

将所述牦牛粪与水置于CO₂气氛下的水热反应釜中，在预设温度下进行水热反应，得到固体产物；The yak dung and water are placed in a hydrothermal reactor under_CO atmosphere, and a hydrothermal reaction is carried out at a preset temperature to obtain a solid product;

将所述固体产物洗涤、干燥后，得到牦牛粪基水热炭。After washing and drying the solid product, yak dung-based hydrothermal charcoal is obtained.

2.根据权利要求1所述的方法，其特征在于，所述牦牛粪与所述水的质量比为1:(3～10)。2. method according to claim 1, is characterized in that, the mass ratio of described yak dung and described water is 1:(3～10).

3.根据权利要求1所述的方法，其特征在于，所述牦牛粪与所述水的质量比为1:5。3. method according to claim 1, is characterized in that, the mass ratio of described yak dung and described water is 1:5.

4.根据权利要求1所述的方法，其特征在于，所述水热反应的反应温度为200～300℃，反应时长为1～2h。4 . The method according to claim 1 , wherein the reaction temperature of the hydrothermal reaction is 200-300° C., and the reaction time is 1-2 h. 5 .

5.根据权利要求4所述的方法，其特征在于，所述水热反应的反应温度为250℃，反应时长为2h。5 . The method according to claim 4 , wherein the reaction temperature of the hydrothermal reaction is 250° C., and the reaction time is 2 h. 6 .

6.根据权利要求1所述的方法，其特征在于，所述水热反应在搅拌轴搅拌下进行，所述搅拌轴的转速为50～100r·min^-1。6 . The method according to claim 1 , wherein the hydrothermal reaction is carried out under stirring by a stirring shaft, and the rotational speed of the stirring shaft is 50-100 r·min⁻¹ . 7 .

7.根据权利要求1所述的方法，其特征在于，所述提供风干、粉碎后的牦牛粪包括：将所述牦牛粪在自然状态下风干后，置于烘箱干燥，粉碎后过筛。7. The method according to claim 1, wherein the providing air-dried and pulverized yak dung comprises: after the yak dung is air-dried in a natural state, placed in an oven to dry, and sieved after pulverization.

8.根据权利要求1所述的方法，其特征在于，所述将所述固体产物洗涤、干燥包括：8. The method according to claim 1, wherein the washing and drying of the solid product comprises:

分别用无水乙醇和水洗涤所述固体产物2～3次；Wash the solid product 2-3 times with absolute ethanol and water respectively;

将洗涤后的固体产物置于90～105℃烘箱烘干。The washed solid product is placed in an oven at 90-105°C for drying.

9.一种利用权利要求1～8中任一项所述的方法得到的牦牛粪基水热炭。9. A yak dung-based hydrothermal charcoal obtained by the method according to any one of claims 1 to 8.

10.一种利用权利要求9所述的牦牛粪基水热炭在土壤改良中的应用。10. An application of the yak dung-based hydrothermal charcoal according to claim 9 in soil improvement.