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纳米腐植酸粉体是一种无毒、抗菌且对重金属离子有螯合和络合的多功能材料。在前期单因素实验基础上,以纳米腐植酸产率为考察指标,利用响应面分析法对碱溶酸析沉淀法配加高剪切技术制备纳米腐植酸的工艺参数进行优化;结果表明,制备纳米腐植酸最优工艺条件:反应时间为3.0 h,反应温度为51.2℃,晶粒调整剂用量为249 mg/L,固液比为9.2∶1,氨水质量分数为12.60%,剪切速率为2 800 r/min,p H=2.5;在此条件下纳米腐植酸产率为95.3%,相比正交实验下收率提高6.9%;拟合出响应值与因子间的方程模型,且氨水浓度和反应温度对纳米腐植酸产率的影响最大。
Nanometer humic acid powder is a non-toxic, anti-bacterial and heavy metal ions chelated and complex multi-functional materials. Based on the previous single-factor experiments, the yield of nano-humic acid was taken as the index, and the response surface analysis method was used to optimize the process parameters of nano-humic acid prepared by alkali-soluble acid precipitation method and high-shear technique. The optimum conditions of nano-humic acid reaction were as follows: the reaction time was 3.0 h, the reaction temperature was 51.2 ℃, the dosage of the grain conditioner was 249 mg / L, the solid-liquid ratio was 9.2:1, the ammonia mass fraction was 12.60% 2 800 r / min, p H = 2.5. Under these conditions, the yield of nano-humic acid was 95.3%, which was 6.9% higher than that of the orthogonal test. The equation model between the response value and the factor was fitted, Concentration and reaction temperature have the greatest impact on the yield of nano-humic acid.