| abstract |
The invention relates to a combined sand-fixing method of plant urease catalysis and planting grass. The high - activity urease is extracted from soybean flour by using distilled water added with trehalose as a solvent ; The molar concentration of urea and calcium acetate) are mixed in equal volumes, grass or tree species are added to the mixed solution, and sprayed into dry sand together. The urea in the gelling solution is first hydrolyzed into CO 3 2‑ and NH 4 + by urease , CO 3 2‑ and then combined with Ca 2+ of calcium acetate to form calcium carbonate, forming a hardened layer on the surface of the aeolian sand, improving the water holding capacity of the aeolian sand. Grass or tree seeds are buried in the desert and germinate and survive in the later stage, which has the effect of sand fixation and sand prevention. The method directly utilizes plant urease to catalyze the reaction, induces carbonate precipitation, has high calcium carbonate extraction efficiency, and has low environmental requirements, which is favorable for popularization and application. |