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Colloid and Polymer Science

, Volume 296, Issue 9, pp 1419–1429 | Cite as

Covalent immobilization of TiO2 within macroporous polymer monolith as a facilely recyclable photocatalyst for water decontamination

  • Yuyan Yu
  • Xiao Meng
  • Ni Zeng
  • Yi Dan
  • Long Jiang
Original Contribution
  • 110 Downloads

Abstract

This study focused on the covalent immobilization of TiO2 on the surface of a porous polymer monolith by a two-step method. Firstly, porous polymeric monolith with trimethoxysilane anchor groups was fabricated by w/o emulsion templated copolymerization of vinyl acetate (VAc) and methacryloxypropyl-trimethoxysilane (MPS). Then, anatase TiO2 were covalently immobilized within the voids of poly(VAc-MPS) monolith via an acid-catalyzed co-condensation of the trimethoxysilane group with a TiO2 sol precursor at low temperate. Scanning electron microscopy images demonstrated that both poly(VAc-MPS) and Ti-P(VAc-MPS) possess dense honeycomb-like macroporous structures. The chemical structure analysis by Fourier transform infrared spectroscopy, powder X-ray diffraction, and X-ray photoelectron spectroscopy revealed that (i) acid-catalyzed sol-gel method in this case could fully convert the amorphous TiO2 sol to anatase TiO2 even at low temperature (70°); (ii) TiO2 particles were covalently immobilized within the voids of the polymer monolith via Si–O–Ti linkage; (iii) acid-catalyzed hydrolysis of the trimethoxysilane groups and VAc led to significant increase in the hydrophilicity of the obtained hybrid porous monolith, Ti-P(VAc-MPS), with a water contact angle of 19.6°. Exemplified by the photo-degradation of methyl orange (MO) in aqueous solution, Ti-P(VAc-MPs) exhibited good photocatalytic activity and excellent recyclability for water decontamination. The as-prepared Ti-P(VAc-MPS) monolith could be efficiently regenerated for cyclic runs without further energy-consuming separation process such as centrifugation and filtration. The present approach opens a green way for obtaining other porous inorganic-organic photocatalyst for water contaminant removal.

Graphic Abstract

Keywords

TiO2 Photocatalysis polyHIPE Porous Ti–O–Si linkage Separation-free 

Notes

Funding information

The authors are grateful to the National Natural Science Foundation of China (Grant nos. 51403140 and 51573109) and the State Key Lab of Polymer Material Engineering Foundation (No. sklpme 2015-2-01 and 2016-3-02) for supporting this research.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interests.

Supplementary material

396_2018_4361_MOESM1_ESM.docx (1.3 mb)
ESM 1 (DOCX 1380 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.State Key Laboratory of Polymer Materials Engineering of ChinaPolymer Research Institute of Sichuan UniversitySichuanChina

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