Lignin-based slow-release nitrogen fertilizer as well as preparation method and application thereof
A lignin-based, lignin-based technology is applied in the field of lignin-based slow-release nitrogen fertilizer and its preparation, can solve the problems of use, low nitrogen content, and cannot be used as slow-release nitrogen fertilizer, etc., and achieves high nitrogen grafting rate, organic nitrogen The effect of high content and improving utilization value
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Embodiment 1
[0060] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:
[0061] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 6 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 70° C. for 25 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.
[0062] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L1), the organic nitrogen content is as figure 2 (L1) shown. It can be seen from the figure that N is effectively incorporated into the molecular structure of the prepared lignin-based slow-release nitrogen fert...
Embodiment 2
[0064] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:
[0065] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 8 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 70° C. for 40 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.
[0066] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L2), the organic nitrogen content is as figure 2 (L2) shown. It can be seen from the figure that N is effectively inserted into the molecular structure of the prepared lignin-based slow-release nitrogen fertiliz...
Embodiment 3
[0068] This embodiment provides a method for preparing lignin-based slow-release nitrogen fertilizer by microwave heating, and its specific steps are:
[0069] Under continuous stirring, firstly, fully dissolve 2 g of phenolized lignin in 40 mL of 1 mol / L sodium hydroxide solution. Next, 6 g of ethylenediamine and 8 g of formaldehyde solution were sequentially added to the above solution. Finally, the above mixed solution was placed in a microwave reactor, and the microwave power was adjusted to 400W, and reacted at 60° C. for 40 minutes. After the reaction, a lignin-based slow-release nitrogen fertilizer was obtained.
[0070] The infrared spectrum of the lignin-based slow-release nitrogen fertilizer prepared in this embodiment is as follows: figure 1 As shown in (L3), the organic nitrogen content is as figure 2 (L3) shown. It can be seen from the figure that N is effectively inserted into the molecular structure of the prepared lignin-based slow-release nitrogen fertiliz...
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