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Polymers 2018, 10(8), 819; https://doi.org/10.3390/polym10080819

Preparation and Characterization of Highly Ordered Mercapto-Modified Bridged Silsesquioxane for Removing Ammonia-Nitrogen from Water

1
College of Food Science, Sichuan Agricultural University, Ya’an 625014, China
2
School of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya’an 625014, China
3
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
*
Author to whom correspondence should be addressed.
Received: 26 June 2018 / Revised: 19 July 2018 / Accepted: 19 July 2018 / Published: 25 July 2018
(This article belongs to the Special Issue POSS-Based Polymers)
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Abstract

In acidic conditions, mesoporous molecular sieves SBA-15 and SBA-15-SH were synthesized. Structural characterization was carried out by powder X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), 13C CP MAS-NMR, 29Si CP MAS-NMR and nitrogen adsorption–desorption (BET). The results showed that in SBA-15-SH, the direct synthesis method made the absorption peak intensity weaker than that of SBA-15, while the post-grafted peak intensity did not change. Their spectra were different due to the C-H stretching bands of Si-O-Si and propyl groups. But their structure was still evenly distributed and was still hexangular mesoporous structure. Their pore size increased, and the H-SBA-15-SH had larger pore size. The adsorption of ammonia-nitrogen by molecular sieve was affected by the relative pressure and the concentration of ammonia-nitrogen, in which the adsorption capacity of G-SBA-15-SH was the largest and the adsorption capacity of SBA-15 was the smallest. View Full-Text
Keywords: direct synthesis; grafting synthesis; mercapto-modified; bridged silsesquioxane direct synthesis; grafting synthesis; mercapto-modified; bridged silsesquioxane
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lin, D.; Huang, Y.; Yang, Y.; Long, X.; Qin, W.; Chen, H.; Zhang, Q.; Wu, Z.; Li, S.; Wu, D.; Hu, L.; Zhang, X. Preparation and Characterization of Highly Ordered Mercapto-Modified Bridged Silsesquioxane for Removing Ammonia-Nitrogen from Water. Polymers 2018, 10, 819.

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