Issue 11, 2016

One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water

Abstract

In this work, we report one new class of one-dimensional highly uniform periodic mesoporous organosilica (PMO) helical nanotubes with a unique amphiphilic framework and perpendicular mesochannels in walls through a simple, efficient and controllable one-step strategy. The chiral mesoporous silica (CMS) nanorods were used as hard templates. The evolution of the nanotube structure involved a process of organosilane-directed growth-induced etching, in which the growth of the external PMO wall promoted the dissolution of internal CMS nanorods, and the dissolved silicate species transformed into the external PMO wall by co-condensation with hydrolyzed organosilane oligomers. Moreover, the helical morphology was retained completely in the process of structural evolution. In addition, PMO helical nanotubes with different aspect ratios, wall thicknesses and curvatures as well as chemical compositions could be easily prepared via this strategy. Furthermore, the PMO helical nanotubes exhibited good amphiphilicity and can be used as a particle emulsifier for fabricating Pickering emulsions with different morphologies in various systems. Most importantly, the PMO helical nanotubes showed outstanding performance in the removal of hydrophobic contaminants from water, whose sorption capacity (1800–3000 mg g−1) was much higher than those of mesosilica nanotubes and conventional MCM-41, and even comparable to those of some sponges.

Graphical abstract: One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water

Supplementary files

Article information

Article type
Paper
Submitted
25 Jan 2016
Accepted
12 Feb 2016
First published
12 Feb 2016

J. Mater. Chem. A, 2016,4, 4145-4154

Author version available

One-dimensional periodic mesoporous organosilica helical nanotubes with amphiphilic properties for the removal of contaminants from water

H. Zou, R. Wang, Z. Shi, J. Dai, Z. Zhang and S. Qiu, J. Mater. Chem. A, 2016, 4, 4145 DOI: 10.1039/C6TA00708B

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