HUANG Zengwei, XU Linchong, YUAN Aiqun, BAI Lijuan, WU Shengfu, WEI Dongping

(School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning 530006，China)

Abstract: The influence of seven single factors such as temperature, pH value, coating amount， initial concentration, stirring speed， coating time and aging time on acid solubility of core-shell structure TiO2@SiO2 over parallel flow method were investigated, and its preparation process was optimized by response surface experiment. The obtained product was characterized by HRTEM, XRD, XPS, SEM, and UV-Vis. The results show that when stirring speed is 300 r/min, the coating time is 60 min, and the initial concentration of TiO2 is 200 g/L, the order of influence of the four factors are coating dose， coating temperature， pH value and aging time. The acid solubility of the product reaches 17.4% under the optimal conditions such as 4.5% of content of coating agent, 83 ℃ of the temperature, 10 of the pH value and 28 h of the aging time. The shell layer is a boehmite Al2O3 with a thickness of about 6 nm and is chemically bonded on the surface of TiO2 nucleus by Ti—O—Al. Core-shell structure of TiO2@Al2O3 has the higher water dispersibility, dispersive stability and UV shielding capability.

Keywords: titanium dioxide； core-shell structure; coating; aluminum oxide

中图分类号：TQ62

文献标志码：A

文章编号：1008-5548(2021)02-0037-10

DOI:10.13732/j.issn.1008-5548.2021.02.006

收稿日期： 2020-09-26， 修回日期：2020-10-20，在线出版时间：2020-12-24 09:05。

基金项目：国家自然科学基金项目，编号：21666006。

第一作者简介：黄增尉(1971—)，男，高级实验师，研究方向为材料化学。E-mail:87526612@qq.com。

通信作者简介：袁爱群(1967—)，女，教授，博士，研究方向为材料化学。E-mail: aiqunyuan1999@sina.com。