Synthesis of Silica-coated Ceria Nanoparticles by Soft Solution Chemical Reactions and their UV-shielding Properties

软溶液化学反应合成二氧化硅包覆二氧化铈纳米粒子及其紫外屏蔽性能

基本信息

批准号：
13555239
负责人：
SATO Tsugio
金额：
$ 8.77万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13555239/
关键词：
soft solution reaction ceria nanoparticle UV-shielding property Transperency in the visible light region Photocatalytic activity Singlet oxygen Damage to DNA Safety to a human body セリアナノ粒子紫外線遮蔽能白色化仮焼構造水格子欠陥酸化触媒活性金属イ

项目摘要

Ceria nanoparticles were prepared by reacting cerium chloride aqueous solution and sodium hydroxide aqueous solution at 40℃ followed by the oxidation with hydrogen peroxide and their characteristics such as morphology, oxidation catalytic activity, photocatalytic activity, UV-shielding ability and transparency in the visible light region were investigated. The morphology of the particle greatly changed depending on the solution pH and doping metal ion. Namely, the product at pH 12 and 6 consisted of rod-like particles and spherical particles, respectively. The crystallite size greatly reduced by doping with calcium ion and zinc ion. The oxidation catalytic activity also greatly decreased by doping with divalent anions. Especially, calcium ion and zinc ion were effective to reduce the oxidation catalytic activity. Both undoped ceria and doped ceria showed much lower photocatalytic activity than titania and zinc oxide. The UV-shielding ability and transparency in the visible light region of ceria nanoparticle were improved by doping with calcium ion and zinc ion. Generally, ceria is yellow, but white powder of ceria possessing excellent UV-shielding ability and transparency in the visible light region could be obtained by calcining nanoparticles of calcia-doped ceria. Titania and zinc oxide caused damages to DNA under irradiation of UV light, but the damages to DNA with undoped ceria and calcium and zinc ion doped ceria were the same level with blank test without Sample. The generation of singlest oxygen under UV irradiation determined by chemical luminescence assay was in the order zinc oxide > titania >> undoped ceria > calcium ion doped ceria = zin ion doped ceria. According to these results, it may be concluded that calcium ion doped ceria can be used as a new UV-absorbent which is excellent in the Safety to a human body.

通过对40°的氯化氯化物水溶液进行反应和氢氧化钠水溶液制备陶瓷纳米颗粒，然后研究了用过氧化氢氧化及其特征，例如形态学，氧化催化活性，光催化活性，光催化活性，紫外线 - 固定能力和可见光区域的透明度。粒子的形态会大大变化，具体取决于溶液pH和掺杂金属离子。也就是说，pH 12和6时的产物分别由棒状颗粒和球形颗粒组成。通过与钙离子和锌离子掺杂，结晶石尺寸大大降低。氧化催化活性也通过与二价阴离子掺杂大大改善。特别是，钙离子和锌离子可有效降低氧化催化活性。未掺杂的陶瓷和掺杂的陶瓷都比钛和锌氧化均显示出低得多的光催化活性。通过与钙离子和锌离子掺杂，改善了陶瓷纳米颗粒可见光区域的紫外线屏蔽能力和透明度。通常，陶瓷是黄色的，但是可以通过钙化钙掺杂的陶瓷的纳米颗粒获得具有出色紫外线屏蔽能力和透明度的白色粉末。在紫外线照射下，二氧化钛和氧化锌会损害DNA，但是用不稳定的陶瓷和钙和锌离子掺杂的DNA损坏了，没有样品的空白测试的水平相同。通过化学发光测定确定的紫外线辐射下的最高氧的产生是氧化锌>>氧化锌>>未掺杂的陶瓷>钙离子掺杂的陶瓷= ZIN离子掺杂的陶瓷。根据这些结果，可以得出结论，钙离子掺杂的陶瓷可以用作一种新的紫外线吸附剂，在人体的安全方面非常出色。