A facile method for preparing thiocyanato-functionalized porous silica nanospheres--颗粒学报PARTICUOLOGY

Li, J., Chen, L., Li, X., Zhang, C., & Liu, Z. (2016). A facile method for preparing thiocyanato-functionalized porous silica nanospheres. Particuology, 24, 183-190. https://doi.org/10.1016/j.partic.2015.03.002

A facile method for preparing thiocyanato-functionalized porous silica nanospheres

Jie Li a^b, Lianxi Chen ^a *, Xi Li^a, Chaocan Zhang ^b, Zhenhui Liu ^a

a School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China
b School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

10.1016/j.partic.2015.03.002

Volume 24, February 2016, Pages 183-190

Received 7 November 2014, Revised 16 February 2015, Accepted 3 March 2015, Available online 12 June 2015, Version of Record 21 January 2016.

E-mail: clx@whut.edu.cn

Highlights

• A facile one-step sol–gel method was developed using cationic surfactants as template.

• Thiocyanato-functionalized porous silica nanospheres with size less than 23 nm were obtained.

• The porous structures and morphology of the samples could be controlled.

Abstract

In this study, we present a facile method to prepare thiocyanato-functionalized porous silica nanospheres. Thiocyanato functionalized silica shells were coated on positively charged cetyltrimethylammonium bromide (CTAB) micelles via hydrolysis and condensation of (3-thiocyanatopropyl)triethoxysilane (TCPTES), the CTAB cores were removed subsequently to form thiocyanato-functionalized porous silica nanospheres. We demonstrate that the contents of the thiocyanato groups within the functionalized porous silica nanosphere frameworks gradually diminished as a function of hydrothermal treatment time at 100 °C until complete removal, confirmed by TGA and FTIR spectra. The data indicate that extended operation at relatively elevated temperatures may lead to the decomposition of the thiocyanato functional groups. In addition, at a lower CTAB concentration (0.0009 M), non-porous thiocyanato functionalized silica nanospheres were formed. However, increasing the CTAB concentration to 0.01 M resulted in porous nanospheres inferring that a CTAB concentration threshold is needed to form thiocyanato-functionalized porous silica nanospheres.

Graphical abstract

Keywords

Thiocyanato; Functionalization; Silica nanospheres; Porous; Micellar template

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