Lin Derong, Huang Yichen, Yang Yuanmeng, Long Xiaomei, Qin Wen, Chen Hong, Zhang Qing, Wu Zhijun, Li Suqing, Wu Dingtao, Hu Lijiang, Zhang Xingwen
College of Food Science, Sichuan Agricultural University, Ya'an 625014, China.
School of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625014, China.
Polymers (Basel). 2018 Jul 25;10(8):819. 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.
在酸性条件下，合成了介孔分子筛SBA - 15和SBA - 15 - SH。通过粉末X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、碳交叉极化魔角旋转核磁共振（C CP MAS - NMR）、硅交叉极化魔角旋转核磁共振（Si CP MAS - NMR）和氮吸附-脱附（BET）进行结构表征。结果表明，在SBA - 15 - SH中，直接合成法使吸收峰强度比SBA - 15的弱，而后嫁接法的峰强度没有变化。由于硅氧硅和丙基的碳氢伸缩带，它们的光谱不同。但它们的结构仍均匀分布，仍为六角形介孔结构。它们的孔径增大，且H - SBA - 15 - SH的孔径更大。分子筛对氨氮的吸附受相对压力和氨氮浓度的影响，其中G - SBA - 15 - SH的吸附容量最大，SBA - 15的吸附容量最小。
