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Controlling the growth of nanosized titania via polymer gelation for photocatalytic applications

机译：通过聚合物凝胶化对光催化应用来控制纳米化二氧化钛的生长

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Nanocrystalline titania was synthesized by a simple, innovative and eco-friendly gelation method by using biopolymers (polysaccharides). The effect of the gelling agent, such as carboxymethylcellulose (CMC) or alginate (Alg), and the drying routes (conventional drying at room temperature, or freeze-drying) on the properties and photocatalytic performances of nanostructured TiO _(2) was examined. The crystallographic structures, and textural and morphological characteristics were investigated by thermogravimetric analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy with energy dispersive spectrometry (ESEM-FEG-EDS), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS) and N _(2) adsorption/desorption isotherms. The as-synthesized samples were fully crystallized and appeared to be highly phase-pure anatase or mixed titania polymorphs, and have a quasi-spherical shape with a particle size ranging from 10.34 to 18.07 nm. Phase-pure anatase was obtained by using alginate as the gelling agent, whereas CMC's gelation promotes mixed structures. The presence of rutile phase results in a lower bandgap value of 3.04 eV corresponding to 408 nm. Thus, the material absorption wavelength shifts slightly from the UV (190–380 nm) to visible region (380–750 nm). The drying process also affects TiO _(2) properties. The lyophilization route improves the oxide's specific surface area, and also its photocatalytic properties verified during Orange G dye photodegradation study.
机译：通过使用生物聚合物（多糖），通过简单，创新和生态友好的胶凝方法合成纳米晶二氧化钛。研究了胶凝剂，例如羧甲基纤维素（CMC）或藻酸盐（ALG）的效果，以及在纳米结构TiO _（2）的性质和光催化性能下对纳米结构和光催化性能进行干燥途径（在室温下常规干燥）（常规干燥） 。通过热重分析（TGA），X射线衍射（XRD），傅里叶变换红外光谱（FTIR），扫描电子显微镜，扫描电子显微镜，扫描电子显微镜（ESEM-FEG-EDS），研究了晶体结构和纹理和形态特征。电子显微镜（TEM），UV-VI扩散反射光谱（DRS）和N _（2）吸附/解吸等温线。作为合成的样品完全结晶，似乎是高相纯的锐钛矿或混合二氧化钛多晶型物，并且具有粒度为10.34至18.07nm的准球形。通过使用藻酸盐作为胶凝剂获得相纯锐钛矿，而CMC的凝胶化促进混合结构。金红石相的存在导致3.04eV的较低的带隙值对应于408nm。因此，材料吸收波长从UV（190-380nm）略微偏移到可见区域（380-750nm）。干燥过程也会影响TiO _（2）的性质。冻干途径改善了氧化物的比表面积，以及其在橙G染料光降解研究期间验证的光催化性能。

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