Enrichment of phenol in water by dibenzo-18-crown ether-6/polyether block amide membrane

doi:10.11949/0438-1157.20210044

Abstract

Abstract:

In this study, to improve the selectivity separation performance of polyether block amide (PEBA) membrane for phenol in water, dibenzo-18-crown ether-6 (CE) was used to modify the PEBA membrane. FT-IR and SEM characterization confirmed that the CE was closely combined with PEBA and the CE was evenly distributed on the membrane surface. AFM characterization showed that CE modification effectively improved the contact area between the membrane surface and phenol. Water contact angle test showed that CE modification greatly improved the hydrophobicity of PEBA /CE membrane. At the same time, the effects of CE content, feed phenol concentration and feed temperature on pervaporation performance of PEBA/CE were systematically studied. The results show that CE can significantly improve the selectivity of PEBA/CE membrane to phenol in water. When the feed phenol concentration is 0.8%(mass) and the operating temperature is 70℃, the separation factor and permeation flux of PEBA/CE-6 membrane (CE content 6%(mass) of PEBA) are 23.34 and 494.40 g/(m²·h), which is far exceeding pure PEBA membrane performance (separation factor 8.46, total permeation flux 547.48 g/(m²·h). The prepared PEBA/CE-6 membranes have good stability and potential industrial application value.

Key words: pervaporation, polyether block amide, dibenzo-18-crown ether-6, phenol

摘要：

为提高聚醚嵌段酰胺（PEBA）膜对水中苯酚的选择分离性能，采用二苯并-18-冠醚-6 (CE) 对PEBA膜进行改性制备了PEBA/CE渗透蒸发膜。通过FT-IR、SEM表征证实了CE与PEBA紧密结合且CE均匀分布在膜表面；AFM表征表明CE的修饰有效地提高了膜表面与苯酚的接触面积；水接触角测试表明CE的修饰极大地提高了PEBA/CE膜的疏水性。同时系统地研究了膜中CE含量、原料液苯酚浓度、进料温度对膜渗透汽化性能的影响，结果表明CE能显著提高PEBA膜对苯酚的选择性，在料液苯酚为0.8%（质量）及70℃操作温度条件下，当CE 的添加量为PEBA的6%（质量）时，PEBA/CE-6膜的分离因子和渗透通量分别为23.34和494.40 g/(m²·h)，远超PEBA膜性能[分离因子8.46，总渗透通量547.48 g/(m²·h)]。长期性能稳定性测试表明所制备PEBA/CE-6膜具有良好稳定性，具有较好的工业运用潜力。

关键词: 渗透汽化, 聚醚嵌段酰胺, 二苯并-18-冠醚-6, 苯酚

CLC Number:

TQ 028.8

FANG Lijun, WANG Jingmei, LIN Qiaojing, CHEN Jianhua, YANG Qian. Enrichment of phenol in water by dibenzo-18-crown ether-6/polyether block amide membrane[J]. CIESC Journal, 2021, 72(7): 3716-3727.

方丽君, 王景梅, 林巧靖, 陈建华, 杨谦. 二苯并-18-冠醚-6/聚醚嵌段酰胺膜富集水中苯酚性能研究[J]. 化工学报, 2021, 72(7): 3716-3727.

Figures/Tables 15

Fig.1 Molecular structure of polyether block amide (a) and dibenzo-18-crown-6 (b)

Fig.2 Mechanism of phenol/water separation by PEBA/CE membrane

Fig.3 FT-IR spectra of samples

Fig.4 SEM image of dibenzo-18-crown-6

Fig.5 SEM images of PEBA/CE membranes

Fig.6 SEM images of PEBA/CE membrane cross-section

Fig.7 SEM images of PEBA/CE-6 membrane before (a) and after (b) pervaporation

Fig.8 AFM images of PEBA/CE membranes

Fig.9 The effect of different addition amounts of CE on the contact angle of PEBA/CE membranes

Fig.10 The influence of CE content on PEBA/CE membrane swelling in 0.8%(mass) phenol dilute solution at 70℃

Fig.11 The effect of crown ether addition on the adsorption selectivity and diffusion selectivity of PEBA/CE membrane

Fig.12 Effect of crown ether addition on the pervaporation separation performance of PEBA/CE membranes

Fig.13 The influence of feed temperature on the pervaporation performance of PEBA/CE-0 membrane and PEBA/CE-6 membranetotal permeation flux (a); separation factor (b); flux of PEBA/CE-0 membrane (c); flux of PEBA/CE-6 membrane (d)

Fig.14 The influence of feed concentrations on the pervaporation performance of PEBA/CE-6 membrane

Fig.15 Long-term pervaporation performance of PEBA/CE-6 membrane for separation of phenol/water

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