Abstract

Aerocellulose with three-dimensional pore structure and amino groups was prepared by free radical grafting polymerization of acrylamide based on the homogeneous ionic liquid system. The effects of reaction temperature, reaction time, initiator dosage, monomer dosage and crosslinking agent dosage on the loading ratio were studied. The aerocellulose was characterized by Fourier transform infrared spectroscopy, elemental analysis, X ray diffraction, scanning electron microscope, thermogravimetric analysis and N₂ adsorption–desorption analysis. The adsorption capacity of CO₂ was measured on a static adsorption device and the results indicated that adding N, N-methylene-bis-acrylamide (MBA) as a cross-linking agent could increase the loading ratio significantly. The loading ratio could reach up to 38.59% when reaction temperature is 333.15 K, reaction time is 6 h and cellulose:APS:AM:MBA = 1:0.1:6:0.1. Although the specific surface area decreased after grafting process, the CO₂ adsorption capacity achieved 1.07 mmol/g at 315.15 K and 190 kPa, while the adsorption amount of ungrafted aerocellulose was only 0.52 mmol/g. Furthermore, the fitting results showed that the CO₂ adsorption behavior on ungrafted aerocellulose belongs to physical adsorption process, and the adsorption on grafted aerocellulose belongs to both physical and chemical adsorption process.

中文翻译：

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纤维素接枝丙烯酰胺的均相制备及其对CO 2的吸附性能

摘要

在均相离子液体体系的基础上，通过丙烯酰胺的自由基接枝聚合反应，制备了具有三维孔结构和氨基的气态纤维素。研究了反应温度，反应时间，引发剂用量，单体用量和交联剂用量对负载比的影响。通过傅里叶变换红外光谱，元素分析，X射线衍射，扫描电子显微镜，热重分析和N ₂吸附-解吸分析对纤维素进行了表征。CO ₂的吸附量在静态吸附装置上进行了测试，结果表明添加N，N-亚甲基双丙烯酰胺（MBA）作为交联剂可以显着提高负载率。当反应温度为333.15 K，反应时间为6h，纤维素：APS：AM：MBA = 1：0.1：6：0.1时，负载率可达38.59％。接枝后比表面积虽然减小，但在315.15 K和190 kPa时，CO _2的吸附量达到1.07 mmol / g，而未接枝的纤维素的吸附量仅为0.52 mmol / g。拟合结果表明，未接枝的纤维素纤维对CO _2的吸附行为属于物理吸附过程，对接枝的纤维素纤维的CO ₂吸附属于物理和化学吸附过程。