可低温驱动的凝胶复合吸附剂的制备及吸/脱附性能研究

doi:10.11949/0438-1157.20201759

摘要/Abstract

摘要：

以丙烯酰胺单体、碳纳米管和无水氯化锂为原材料，通过原位聚合法制备了一种新型复合吸附剂，该吸附剂呈水凝胶形式。采用扫描电子显微镜和同步热分析仪对吸附剂进行表征，并用恒温恒湿箱测试了复合吸附剂的动态吸附/解附性能以及平衡吸附性能。研究表明，凝胶复合吸附剂在25℃和75%RH下，平衡吸附量高达1.75 g/g，是硅胶基复合吸附剂的2.5倍以上；并在45℃环境中解吸出70%的吸附水量；采用线性驱动力模型拟合计算了相同工况的动态吸附速率，与国内外其他复合吸附剂相比，本文吸附剂的吸附速率系数和吸附量均有很大提升。

关键词: 复合吸附剂, 水凝胶, 热湿性能, LDF模型

Abstract:

A novel hydrogel-based composite sorbent was prepared by in-situ polymerization with acrylamide monomer, carbon nanotubes and anhydrous lithium chloride. The sorbent was characterized by scanning electron microscope and synchronous thermal analyzer. The dynamic adsorption / desorption performance and equilibrium adsorption performance of the composite adsorbent were tested in a constant temperature and humidity chamber. The results showed that the equilibrium adsorption capacity of the hydrogel-based sorbent was as high as 1.75 g/g at 25℃ and 75% relative humidity, more than 2.5 times of silica-based sorbent; moreover, hydrogel-based sorbent could desorb 70% of the adsorbed water under 45℃; the dynamic adsorption rate of hydrogel-based sorbent was calculated by fitting linear driving force model under the same conditions. Compared with other composite adsorbents at home and abroad, the adsorption rate coefficient and adsorption capacity of the adsorbent were greatly improved.

Key words: composite sorbent, hydrogel, hygrothermal performance, LDF model

中图分类号:

O 647.32

邓超和, 王佳韵, 李金凤, 刘业凤, 王如竹. 可低温驱动的凝胶复合吸附剂的制备及吸/脱附性能研究[J]. 化工学报, 2021, 72(8): 4401-4409.

Chaohe DENG, Jiayun WANG, Jinfeng LI, Yefeng LIU, Ruzhu WANG. Preparation and adsorption / desorption performance of hydrogel-based composite sorbent driven by low-temperature[J]. CIESC Journal, 2021, 72(8): 4401-4409.

图/表 11

表1 复合吸附剂的参数

Table 1 Parameters of composite sorbents

吸附剂	AM质量/g	CNT浓度/(mg/ml)	含盐量/g	干材料质量/g
PCL0	0.6	0	0	0.5794
PCL1	0.6	1	0	0.5854
PCL2	0.6	1	0.29	0.9825
PCL3	0.6	1	0.58	1.3552
PCL4	0.6	1	1.16	2.1302
PCL5	0.6	1	1.51	2.7004
PCL6	0.6	1.5	0.29	1.0318
PCL7	0.6	1.5	0.58	1.2911
PCL8	0.6	1.5	1.16	2.1986
PCL9	0.6	1.5	1.51	2.7966

图1 复合吸附剂在25℃&75%RH下吸附前后对比图

Fig.1 Comparison of composite sorbents before and after adsorption under 25℃&75% RH

图2 复合吸附剂的SEM图

Fig.2 SEM pictures of composite sorbents

图3 PCL9的TGA曲线

Fig.3 TGA curves of PCL9

图4 各吸附剂在不同工况下的非平衡吸附性能

Fig.4 Non-equilibrium adsorption performances of sorbents under different conditions

图5 各吸附剂在不同工况下的动态解吸曲线

Fig.5 Dynamic desorption curves of sorbents under different conditions

图6 PCL9复合吸附剂稳定性实验

Fig.6 Stability test of PCL9 composite adsorbent

图7 各吸附剂在不同温度下的平衡吸附量

Fig.7 Equilibrium adsorption capacity of sorbents under different temperatures

图8 在25℃&75%RH下的等温吸附动力学

Fig.8 Isothermal sorption kinetics of sorbents under 25℃ & 75% RH

表2 25℃&75%RH下各吸附剂的吸附速率系数及相关系数

Table 2 The coefficient of adsorption rates and related coefficients of sorbents under 25℃ & 75% RH

吸附剂名称	吸附速率系数/s^-1	相关系数
PCL2	0.00522	0.99327
PCL3	0.00450	0.98701
PCL4	0.00425	0.98835
PCL5	0.00486	0.99415
PCL6	0.00557	0.99688
PCL7	0.00449	0.98600
PCL8	0.00456	0.99280
PCL9	0.00518	0.99472

表3 各吸附剂的吸附速率系数及吸附量

Table 3 The coefficient of adsorption rates and adsorption capacity of each adsorbent humidity

吸附剂	吸附条件	吸附速率系数/s^-1	吸附量/(g/g)	文献
SGB/LiCl	20℃&70%RH	3.8×10^-4	0.54	[18]
SGC/LiCl	20℃&70%RH	2.9×10^-4	0.69	[18]
ACF30	25℃&70%RH	1.32×10^-4	1.6	[40]
SC30	25℃&70%RH	1.48×10^-4	0.55	[40]
CS6	25℃&80%RH	2.55×10^-3	1.06	[32]
S5	15℃&70%RH	1.5×10^-3	0.46	[41]
ACFF–Silica sol–LiCl30	25℃&70%RH	8.96×10^-3	1.1	[42]
PCL9	25℃&75%RH	5.18×10^-3	1.75	本文

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