Preparation method of slow-release fertilizer
A slow-release fertilizer, biomass coke technology, applied in nitrogen fertilizer, potash fertilizer, phosphate fertilizer and other directions, can solve the problems of unsuitable for large-scale use of farmland, unreasonable application of chemical fertilizer, complicated preparation process, etc., to promote organic integration and prevent soil erosion. , the effect of high surface activity
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Embodiment 1
[0034] Preparation of slow-release fertilizer:
[0035] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;
[0036] (2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;
[0037] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 4g of adsorption auxiliary agent...
Embodiment 2
[0042] (1) Activation of biomass coke: place 20g of biomass coke in a sealed place at 5°C for 1 hour, then place it in an oven at 100°C to dry to constant weight, and roast it at 500°C for 1 hour to obtain activated biomass coke;
[0043](2) Modified preparation of chitosan: put 20g of chitosan solids into the stirrer, add 10g of acetic acid solution with a mass fraction of 3%, stir until completely dissolved at 30°C; add 10g of chitosan to the acetic acid solution Toluene diisocyanate and 2g of azobisisoheptanonitrile were reacted at 75°C for 2 hours, filtered while hot, and the filter cake was washed with deionized water and absolute ethanol to remove unreacted monomers, and then dried in an oven at 100°C to constant weight. Promptly obtain modified chitosan;
[0044] (3) Preparation of slow-release fertilizer: disperse 20g of biomass coke in absolute ethanol, add 20g of modified chitosan and 3g of adsorption auxiliary agent, heat to reflux state, insulate and stir for 20min...
Embodiment 3
[0070] Based on Example 1, a comparative example 1 without modifying chitosan, a comparative example 2 using polyglutamic acid as an adsorption auxiliary agent, and a comparative example 3 without adding an adsorption auxiliary agent were set.
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