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以风化煤为原料,Z17与ZS复配作晶粒调整剂,采用碱溶酸析沉淀法配加高剪切方式,制备了具有平均粒径60nm、分布均匀的纳米腐植酸。对影响制备的因素:pH值、剪切速度、晶粒调整剂用量和陈化时间进行优化研究,得出最优化工艺条件:用A17+ZS作晶粒调整剂、pH=2.5、剪切转速为2500r·min-1、陈化时间3.5h。用扫描电镜(SEM)、凝胶色谱分析仪(GPC)及比表面积分析仪(BET)对产物的粒径、形貌、分子量大小、比表面积及孔径进行表征;同时以大肠杆菌和金黄色葡萄球菌为菌株,采用三角瓶震荡试验法,对普通腐植酸和纳米腐植酸的抗菌性能进行研究。结果表明:纳米腐植酸对大肠杆菌及金黄色葡萄球菌的抗菌率分别为99.1%和98.6%。
Weathered coal as raw material, Z17 and ZS compound as a grain regulator, the use of alkali-soluble acid precipitation method with high shear mode, prepared with an average particle size of 60nm, uniform distribution of nano-humic acid. The optimum conditions were obtained as follows: pH value, shear rate, amount of grain conditioner and aging time. The optimum conditions were as follows: A17 + ZS as grain regulator, pH = 2.5, shear rate 2500r · min-1, aging time 3.5h. The particle size, morphology, molecular weight, specific surface area and pore size of the product were characterized by scanning electron microscopy (SEM), gel permeation chromatography (GPC) and specific surface area analyzer (BET) Cocci strains, using triangular flask shock test method, the common humic acid and nano humic acid antibacterial properties were studied. The results showed that the antibacterial rates of nano-humic acid to Escherichia coli and Staphylococcus aureus were 99.1% and 98.6%, respectively.