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.

将氯化铈水溶液与氢氧化钠水溶液在40℃下反应，再用过氧化氢氧化制备了纳米二氧化铈，并对其形貌、氧化催化活性、光催化活性、紫外屏蔽能力和可见光区透明度等特性进行了研究。研究发现，颗粒的形态随溶液 pH 值和掺杂金属离子的变化而发生很大变化，即 pH 值为 12 和 6 时的产物。分别由棒状颗粒和球形颗粒组成，钙离子和锌离子的掺杂大大降低了氧化催化活性，特别是钙离子和锌离子的氧化催化活性显着降低。未掺杂的二氧化铈和掺杂的二氧化铈的光催化活性均比二氧化钛和氧化锌低得多。通过钙离子和锌离子的掺杂改善了二氧化铈纳米粒子的光区，一般情况下，二氧化铈呈黄色，但通过煅烧氧化钙掺杂的纳米粒子，可以得到具有优异的紫外屏蔽能力和可见光区透明度的白色二氧化铈粉末。二氧化钛和氧化锌在紫外光照射下对DNA有损伤，但未掺杂二氧化铈和钙锌离子掺杂二氧化铈对DNA的损伤与空白试验相同。化学发光法测定紫外光照射下单氧的产生顺序为：氧化锌>二氧化钛>>未掺杂的二氧化铈>钙离子掺杂的二氧化铈=锌离子掺杂的二氧化铈。离子掺杂二氧化铈可用作新型紫外线吸收剂，对人体安全性优异。