National Engineering Laboratory for Efficient Use of Soil and Fertilizer Resources; National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, College of Resources and Environment, Shandong Agricultural University, Daizong Street No. 61, Taian, Shandong 271018, China.
Economic and Technological Development Zone, Baoyuan Bio-Agri Technology Ltd., Chengdu Street No. 8, Yantai, Shandong 264006, China.
J Agric Food Chem. 2020 Nov 25;68(47):13620-13631. doi: 10.1021/acs.jafc.0c04729. Epub 2020 Nov 3.
Although solid-phase activation of lignite using a nanocatalyst has great potential in producing low-cost and sustainable humic acid, the large-scale application of this technology still faces challenges because of the high price and toxicity of the nanocatalyst. Additionally, the specific molecular components of humic acid in activated lignite remain unknown. In this work, a multifunctional molybdate-phosphorus hierarchical hollow nanosphere (Mo-P-HH) catalyst was successfully manufactured by a simple way followed by phosphorization. In comparison with a commercial Pd/C catalyst, the multifunctional Mo-P-HH catalyst was more effective in producing water-soluble humic acid with small molecular functional groups from lignite via solid-phase activation. Moreover, Fourier transform ion cyclotron resonance mass spectrometry revealed the molecular compositions of humic acid in activated lignite. Compared with that from raw lignite, the humic acid after Mo-P-HH activation had less aromatic structure but higher content of lipids, proteins, amino sugar, and carbohydrates. In addition, the activated humic acid simulated seed germination and seedling growth. Therefore, this study provided a high-performance hierarchical hollow nanocatalyst for activation of humic acid and also offered the theoretical basis for the application of humic acid in agriculture.
尽管利用纳米催化剂对褐煤进行固相活化以生产低成本、可持续的腐殖酸具有很大的潜力，但由于纳米催化剂价格高、毒性大，该技术的大规模应用仍面临挑战。此外，活化褐煤中腐殖酸的特定分子组成仍然未知。在这项工作中，通过一种简单的方法（随后进行磷化）成功制造了一种多功能钼酸盐-磷分级空心纳米球（Mo-P-HH）催化剂。与商业 Pd/C 催化剂相比，多功能 Mo-P-HH 催化剂在通过固相活化从褐煤中生产具有小分子量官能团的水溶性腐殖酸方面更有效。此外，傅里叶变换离子回旋共振质谱揭示了活化褐煤中腐殖酸的分子组成。与原煤相比，Mo-P-HH 活化后的腐殖酸具有较少的芳香结构，但具有更高含量的脂质、蛋白质、氨基糖和碳水化合物。此外，活化的腐殖酸模拟了种子萌发和幼苗生长。因此，本研究为腐殖酸的活化提供了一种高性能的分级空心纳米催化剂，并为腐殖酸在农业中的应用提供了理论依据。
