Research & Development

Preparation process of core-shell structure TiO2@SiO2 optimized by response surface experiment

  • Linchong Xu ,
  • Aiqun Yuan ,
  • Shengfu Wu ,
  • Zengwei Huang ,
  • Lijuan Bai ,
  • Dongping Wei
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  • School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530006,China

Received date: 2020-04-18

  Online published: 2020-11-24

Abstract

Core-shell structure TiO2@SiO2 was prepared by parallel flow method using rutile TiO2 as the core and sodium silicate as the coating agent.The influence of seven single factors including pH,temperature,stirring rate,coating time,initial concentration of TiO2,coating amount and aging time on acid solubility of products were explored by single factor experiment.The preparation process was optimized by response surface experiment.The obtained product was characterized by TEM,XPS,SEM,XRD,FT-IR and UV-Vis.The results showed that when mixing rate was 300 r/min,the coating time was 60 min and the initial mass concentration of TiO2 was 200 g/L,the order of influence of the four factors was as follows: coating dose> coating temperature>pH>aging time.The optimal conditions were as follows: the content of coating agent was 4.41%,the temperature was 83.65 ℃,the pH was 9.59 and the aging time was 25.62 h.Under the conditions,the acid solubility of the product reached 3.43%.The shell layer was amorphous SiO2 with a thickness of about 5 nm and was chemically bonded on the surface of TiO2 nucleus by Ti-O-Si.Core-shell structure TiO2@SiO2 has the higher UV shielding capability.

Cite this article

Linchong Xu , Aiqun Yuan , Shengfu Wu , Zengwei Huang , Lijuan Bai , Dongping Wei . Preparation process of core-shell structure TiO2@SiO2 optimized by response surface experiment[J]. Inorganic Chemicals Industry, 2020 , 52(10) : 77 -83 . DOI: 10.11962/1006-4990.2019-0564

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