College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037, People's Republic of China.
College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, People's Republic of China.
Environ Sci Pollut Res Int. 2019 Jun;26(16):16716-16726. doi: 10.1007/s11356-019-05068-3. Epub 2019 Apr 16.
In this study, the cellulose nanocrystals (CNC) obtained by acid hydrolysis of microcrystalline cellulose (MCC) are customized by suspension to obtain a spherical CNC hydrogel. The N-(2-aminoethyl) (3-amino-propyl) methyldimethoxyansile (AEAPMDS) preparation was grafted to spherical CNC hydrogel using a water phase heat treatment. Finally, aerogel samples were obtained by tert-butanol replacement and freeze-drying. The test results confirmed that the aminosilane was grafted on CNC. Electron micrographs and N sorption isotherms showed that the pores of the aerogel were partially blocked due to the introduction of AEAPMDS, and the specific surface area was decreased. Due to the presence of chemisorption, the amount of CO adsorbed at a pressure of 3 bar by the modified aerogel (2.63 mmol/g) was greatly improved compared with the unmodified aerogel (0.26 mmol/g), and the adsorption results were fit well by the Langmuir model. Thus, our experiments provided the opportunity to develop a new CO absorbent material.
在这项研究中，通过微晶纤维素 (MCC) 的酸水解获得的纤维素纳米晶体 (CNC) 被定制为悬浮液，以获得球形 CNC 水凝胶。使用水相热处理将 N-(2-氨乙基)-(3-氨基丙基)甲二乙氧基硅烷 (AEAPMDS) 接枝到球形 CNC 水凝胶上。最后，通过叔丁醇取代和冷冻干燥获得气凝胶样品。测试结果证实了氨基硅烷接枝到 CNC 上。电子显微镜照片和 N 吸附等温线表明，由于引入了 AEAPMDS，气凝胶的部分孔被阻塞，比表面积减小。由于存在化学吸附，改性气凝胶（2.63 mmol/g）在 3 bar 压力下吸附的 CO 量（2.63 mmol/g）比未改性气凝胶（0.26 mmol/g）大大提高，吸附结果与朗缪尔模型拟合良好。因此，我们的实验为开发新型 CO 吸收材料提供了机会。
