新型双金属纳米材料的可控合成及功能研究

发布时间：2018-05-27 23:08

本文选题：半导体纳米材料 + 离子交换　；参考：《河南师范大学》2015年硕士论文

【摘要】：纳米材料因其生物相容性良好、密度较低比表面积及孔隙率较大等特点以及其独特的小尺寸效应,被广泛应用在荧光标记、药物输送抑菌抗癌催化、传感及化学储能等方面。在本论文中,我们以牛血清蛋白(BSA)为模板,通过离子交换法,创新性地合成了不同系列的双金属硫化物半导体纳米材料,用热重-差示扫描量热仪(TG-DSC)、粉末X射线衍射仪(XRD)、傅里叶变换红外光谱仪(FTIR)对材料的成分和含量进行了分析,用高分辨透射电子显微镜(HRTEM)观察了材料的形貌,并对材料的光催化性能及抑菌和抗癌等生物活性进行了测试。本论文的研究工作归纳起来分为两大部分:(1)用BSA作模板结合离子交换的方法创新性地合成了颗粒均匀且具有较好分散性的双金属硫化物半导体纳米材料(BSA/ZnS-CdS、BSA/ZnS-Ag2S、BSA/ZnS-PbS)。此外,我们还研究了三种纳米材料不同取代点产物对模型染料罗丹明B(RhB)和甲基橙(MO)的光催化降解活性的影响。结果表明:在500 W汞灯照射下,三种双金属硫化物半导体纳米材料对甲基橙的降解活性均高于罗丹明B,但是甲基橙浓度对材料的降解活性影响不大,在15 min内降解率均可达到80%以上,并且与弱碱性(例如:pH 8.0and 9.0)环境相比,弱酸性(例如:pH 5.0 and 6.0)环境对纳米材料光催化降解活性有促进作用。(2)用BSA作模板结合离子交换的方法成功地合成了尺寸均一、直径约为5 nm的量子点BSA/CdS-CuS。此外,我们还研究了该量子点对PC 12细胞的活性影响以及其抑菌性。结果表明:不同浓度的纳米材料溶液对PC 12细胞的生长和代谢均有抑制活性,但当样品浓度为500μg/mL时,对细胞的抑制率达到最大值74.88±0.4%。此外,该纳米材料对大肠杆菌的生长也有抑制作用,且抑制作用随着样品质量的增加而增强。
[Abstract]:Because of its good biocompatibility, nanomaterials have low density. Because of its large specific surface area and porosity and its unique small size effect, it has been widely used in fluorescent labeling, drug delivery, and so on. Bacteriostasis and cancer? Catalysis, sensing and chemical energy storage. In this thesis, different series of bimetallic sulfide semiconductor nanomaterials were synthesized by ion exchange using bovine serum protein (BSA) as template. The composition and content of the materials were analyzed by thermogravimetric differential scanning calorimeter (TG-DSCN), powder X-ray diffractometer (XRD) and Fourier transform infrared spectroscopy (FTIR). The morphology of the materials was observed by high resolution transmission electron microscopy (HRTEM). The photocatalytic activity, bacteriostatic and anticancer activity of the materials were also tested. The research work in this paper is divided into two parts: 1) BSA / ZnS-CdSU / BSA-Ag / BSA-ZnS-PbSN / BSA-ZnS-Ag / BSA-PbSU / BSA-ZnS-CdSU / BSA-ZnS-PbSU / BSA-ZnS-CdSU / BSA-ZnS-PbSU nanomaterials with uniform particle size and good dispersion have been synthesized by using BSA as template and ion exchange method. In addition, we also studied the effects of different substitution point products of three nanomaterials on the photocatalytic degradation activities of model dyes Rhodamine (B) RhB () and methyl orange (MOO). The results showed that the degradation activity of methyl orange was higher than that of Rhodamine B under the irradiation of 500 W Hg lamp, but the concentration of methyl orange had little effect on the degradation activity of methyl orange. In 15 min, the degradation rate can reach more than 80%, and compared with the weakly alkaline (e.g., pH 8.0and 9. 0) environment, Weakly acidic (e.g., pH 5.0 and 6.0) environment can promote photocatalytic degradation of nanomaterials. We successfully synthesized BSA-CdS-CuSs with uniform size and diameter of about 5 nm by using BSA as template and ion exchange method. In addition, we also studied the effect of QDs on the activity of PC12 cells and their bacteriostasis. The results showed that the growth and metabolism of PC12 cells were inhibited by different concentrations of nanomaterials solution, but the inhibition rate of PC12 cells reached a maximum of 74.88 卤0.4 when the concentration of the sample was 500 渭 g/mL. In addition, the growth of Escherichia coli was inhibited by the nanomaterials, and the inhibition increased with the increase of sample mass.
【学位授予单位】：河南师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.1

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