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

• Published in: Polymers 2018-07, Vol.10 (8), p.819
• Main Authors: Lin, Derong, Huang, Yichen, Yang, Yuanmeng, Long, Xiaomei, Qin, Wen, Chen, Hong, Zhang, Qing, Wu, Zhijun, Li, Suqing, Wu, Dingtao, Hu, Lijiang, Zhang, Xingwen
• Format: Article
• Language: English
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym10080819

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), C CP MAS-NMR, Si 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.