Synthesis and CO<sub>2</sub> Absorption of Anhydrous Colloidal Suspension Based on Hollow Silica Nanospheres
Ding, Yudong
Guo, Liheng
Li, Xiaoqiang
Liao, Qiang
Zhu, Xun
Wang, Hong
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Ding Y., Guo L., Li X., Liao Q., Zhu X., Wang H., 2019, Synthesis and CO2 Absorption of Anhydrous Colloidal Suspension Based on Hollow Silica Nanospheres, Chemical Engineering Transactions, 76, 1051-1056.
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A novel anhydrous colloidal suspension was synthesized experimentally for CO2 absorption by dispersing hollow silica nanospheres (HSNs) modified by diethylenetriamine (DETA) in 2-[2-(dimethylamine) ethoxy] ethanol (DMEE) in this work. The physicochemical properties of HSNs synthesized were studied, and HSNs presented uniformed sphere-like morphology and microporous structures dominated by micropores. The CO2 absorption performance of DETA-HSNs/DMEE with different DETA loading contents (0 - 60 wt%) was investigated. A high DETA loading content can promote effectively the CO2 absorption capacity, and 60 wt%DETA-HSNs/DMEE had a highest absorption capacity of 1.0630 ± 0.0849 mmol/g. But more DETA resulted into a greater resistance of CO2 transfer in the late stage of absorption, and extend the absorption time. Moreover, pseudo-second-order model could be more successful to predict the CO2 absorption process in the colloidal suspensions studied.
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