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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >High yield synthesis and characterization of well-ordered Mesoporous silica nanoparticles using Sodium Carboxy Methyl Cellulose
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High yield synthesis and characterization of well-ordered Mesoporous silica nanoparticles using Sodium Carboxy Methyl Cellulose

机译：使用羧甲基纤维素钠的高产率合成和有序介孔二氧化硅纳米粒子的表征

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摘要

In the present work, mesoporous silica nanoparticles (MSNs) with well-ordered hexagonal structure were synthesized using Sodium Carboxy Methyl Cellulose. The MSNs were characterized by scanning electron microscopy, dynamic light scattering, powder XRD, nitrogen physisorption and Transmission electron microscopy. The MSNs were also functionalized with thiol groups and its capacity toward adsorption of a large cation, i.e. lead was investigated. Scanning electron microscopy reveals that MSNs have semi-spherical shapes. The XRD pattern of the calcined sample shows at least five well-defined peaks which point out that silicate nanoparticles have hexagonal array of pores as MCM-41 structure. The nitrogen adsorption isotherm displays a type IV isotherm according to the IUPAC classification. A sharp inflection in capillary condensation/evaporation step specifies that well-ordered MCM-41 nanoparticles were synthesized. TEM image shows the well-ordered hexagonal structure of MSNs. The adsorption capacity of functionalized MSNs was higher than functionalized MCM-41 in which one reason for such behavior might be explained by higher accessibility of pores of functionalized MSNs. This approach was carried out using relatively low-cost and nonhazardous reactants in concentrated reaction medium and also the yield of this approach was high up to 96% by weight.
机译：在本工作中，使用羧甲基纤维素钠合成了具有良好六方结构的介孔二氧化硅纳米粒子（MSN）。通过扫描电子显微镜，动态光散射，粉末XRD，氮物理吸附和透射电子显微镜对MSN进行表征。还用硫醇基官能化了MSN，并研究了其吸附大阳离子（即铅）的能力。扫描电子显微镜显示MSN具有半球形。煅烧样品的XRD图谱显示至少五个明确定义的峰，这些峰指出硅酸盐纳米颗粒具有六方孔阵列作为MCM-41结构。氮吸附等温线根据IUPAC分类显示IV型等温线。毛细管冷凝/蒸发步骤中的急剧变化表明合成了有序的MCM-41纳米粒子。 TEM图像显示了MSN的有序六边形结构。功能化MSNs的吸附能力高于功能化MCM-41，其中这种现象的一个原因可能是功能化MSNs的孔的可及性更高。该方法是在浓缩反应介质中使用成本相对较低且无害的反应物进行的，该方法的收率高达96％（重量）。

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