Ag负载Al基多孔材料的制备及性能研究
发布时间：2018-09-04 18:05
【摘要】：纳米Ag具有高效、广泛及持久抗菌等优点,被广泛应用于工业、环境保护、医药等领域,但其尺寸效应带来的团聚现象导致其抗菌性能降低,限制了纳米Ag在抗菌领域的应用。为解决纳米Ag/Al2O3材料在制备和使用过程中出现的团聚的问题,改善其O吸附性能及抗菌性能。本文采用熔模铸造和浸渍法制备出纳米Ag负载Al基多孔材料。对纳米Ag负载Al基多孔材料的制备、O吸附性能及抗菌性能进行了研究,主要研究结果如下:(1)利用熔模铸造法,以纯铝为原料制备出孔结构为25PPI和30PPI的多孔铝基载体。通过实验发现,当采用无缺陷型石膏型为前驱体制备多孔铝基材料时,其孔结构与铝液温度、模具温度和压力三个参数密切相关,分析得出载体的最佳制备工艺为:铝液温度为760～780℃,模具温度为530℃,压力为0.35MPa。(2)采用浸渍法在多孔铝基载体上负载纳米Ag。通过对Ag形貌的分析发现多孔铝载体在AgN03浓度为1%时配制的银氨络合物中浸渍1h,干燥后在10%H2+90%Ar气氛下,通过还原温度250℃、还原时间3h的还原过程可在多孔铝基材料表面获得尺寸为100～200mm的球形纳米Ag,并且纳米Ag在多孔铝表面分散较为均匀,无团聚现象发生。(3)利用XPS对样品表面元素进行了分析。其分析结果表明,样品在还原及氧化过程中,会发生Al与Ag的相互作用,在样品表面形成Al95Ag5;氧化态样品中Al95Ag5的量较还原态样品多,而Al95Ag5的增加不利于Ag与O的相互作用;相比于还原态样品而言,氧化态样品吸附的O较多,结合能也较高,分析认为氧化态样品中的O较多的是以较深层次的O原子或表面分子吸附O,而还原态样品为原子态吸附O。(4)讨论了还原态和氧化态纳米Ag负载Al基多孔材料对大肠杆菌和金黄色葡萄球菌的杀菌作用。结果表明,还原态样品杀菌率明显好于氧化态样品。其在60min内,还原态样品对大肠杆菌的杀菌率可以达到95%,对金黄色葡萄球菌的杀菌率可以达到98.6%,表现出了非常好的杀菌效果;另外,Ag的抗菌性能并非随O吸附量的增加而提高,而是与Ag和O的作用形式密切相关。
[Abstract]:Nanocrystalline Ag has been widely used in industry, environmental protection, medicine and other fields because of its high efficiency, wide and lasting antibacterial properties. However, the agglomeration caused by its size effect leads to the decrease of its antibacterial performance, which limits the application of nanometer Ag in antibacterial field. In order to solve the problem of agglomeration in the preparation and application of nanometer Ag/Al2O3 materials, the O adsorption and antimicrobial properties of nanocrystalline Ag/Al2O3 materials were improved. In this paper, nano Ag supported Al based porous materials were prepared by investment casting and impregnation. The adsorption and antibacterial properties of nano-sized Ag supported Al based porous materials were studied. The main results were as follows: (1) porous aluminum carriers with pore structure of 25PPI and 30PPI were prepared by using pure aluminum as raw material by investment casting. The experimental results show that the pore structure of porous aluminum matrix is closely related to the temperature of molten aluminum, mold temperature and pressure when the non-defect gypsum mould is used as the precursor. The results show that the optimum preparation process of the carrier is as follows: the temperature of liquid aluminum is 760,780 鈩，
本文编号：2222937
[Abstract]:Nanocrystalline Ag has been widely used in industry, environmental protection, medicine and other fields because of its high efficiency, wide and lasting antibacterial properties. However, the agglomeration caused by its size effect leads to the decrease of its antibacterial performance, which limits the application of nanometer Ag in antibacterial field. In order to solve the problem of agglomeration in the preparation and application of nanometer Ag/Al2O3 materials, the O adsorption and antimicrobial properties of nanocrystalline Ag/Al2O3 materials were improved. In this paper, nano Ag supported Al based porous materials were prepared by investment casting and impregnation. The adsorption and antibacterial properties of nano-sized Ag supported Al based porous materials were studied. The main results were as follows: (1) porous aluminum carriers with pore structure of 25PPI and 30PPI were prepared by using pure aluminum as raw material by investment casting. The experimental results show that the pore structure of porous aluminum matrix is closely related to the temperature of molten aluminum, mold temperature and pressure when the non-defect gypsum mould is used as the precursor. The results show that the optimum preparation process of the carrier is as follows: the temperature of liquid aluminum is 760,780 鈩，
本文编号：2222937
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