Liu Yu, Gao Hui, Liu Shanshan, Li Jinrong, Kong Fangong
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Key Laboratory of Paper Science and Technology of Ministry of Education, Faculty of Light Industry, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China.
Polymers (Basel). 2023 Dec 29;16(1):107. doi: 10.3390/polym16010107.
Nitrification inhibitor is essential for increasing the nitrogen utilization efficiency of agricultural plants, thus reducing environmental pollution and increasing crop yield. However, the easy volatilization and limited functional property is still the bottleneck of nitrification inhibitors. Herein, a novel water-soluble polymeric nitrification inhibitor was synthesized through the copolymerization of acrylamide and bio-based acrylic acid, which was synthesized from biomass-derived furfural, and the complexation of carboxyl groups and 3,4-dimethylpyrazole. The results showed that the nitrification inhibitor was an amorphous polymer product with a glass transition temperature of 146 °C and a thermal decomposition temperature of 176 °C, and the content of 3,4-dimethylpyrazole reached 2.81 wt%, which was 115% higher than our earlier product (1.31 wt%). The polymeric nitrification inhibitor can inhibit the activity of ammonia-oxidizing bacteria effectively, thus inhibiting the conversion of ammonium nitrogen to nitrate nitrogen and converting the insoluble phosphate into soluble and absorbable phosphate. By introducing a copolymer structure with a strong flocculation capacity, the polymeric nitrification inhibitor is further endowed with a soil-loosening function, which can increase the porosity of soil to improve the soil environment. Therefore, the nitrification inhibitor can be used in water-soluble and liquid fertilizers, as well as in high tower melting granulated compound fertilizers.
硝化抑制剂对于提高农作物的氮利用效率至关重要，从而减少环境污染并提高作物产量。然而，易挥发和功能有限仍是硝化抑制剂的瓶颈。在此，通过丙烯酰胺与由生物质衍生的糠醛合成的生物基丙烯酸的共聚反应，以及羧基与3,4 - 二甲基吡唑的络合反应，合成了一种新型水溶性聚合物硝化抑制剂。结果表明，该硝化抑制剂是一种无定形聚合物产物，玻璃化转变温度为146℃，热分解温度为176℃，3,4 - 二甲基吡唑含量达到2.81 wt%，比我们早期的产品（1.31 wt%）高出115%。该聚合物硝化抑制剂能有效抑制氨氧化细菌的活性，从而抑制铵态氮向硝态氮的转化，并将难溶性磷酸盐转化为可溶性且可吸收的磷酸盐。通过引入具有强絮凝能力的共聚物结构，该聚合物硝化抑制剂还具有松土功能，可增加土壤孔隙度以改善土壤环境。因此，该硝化抑制剂可用于水溶性肥料、液体肥料以及高塔熔融造粒复合肥中。
