Separation of neutral aromatic compounds from tobacco waste by ZIF-67/PDMS composite membrane

doi:10.11949/0438-1157.20241510

Abstract

Abstract:

The separation of neutral aromatic compounds from tobacco waste is one of the important ways to recycle waste tobacco resources. Polyvinylidene fluoride (PVDF) was used as the base membrane and zeolite imidazolate skeleton material ZIF-67 was used as the modified filler to prepare polydimethylsiloxane (PDMS) pervaporation composite membrane for separation of neutral aroma components of tobacco. SEM, contact angle measuring instrument, FTIR and XRD were used to characterize the physical and chemical properties of the composite membrane, and the performance of composite membrane for pervaporation of aromatic compounds was investigated. The results show that ZIF-67 is physically blended with the PDMS matrix, enhancing the hydrophobicity of the membrane. With the increase of ZIF-67 content, the permeation flux and separation factor increase firstly and then decrease. The pervaporation separation performance reaches its optimum when ZIF-67 filling content was 5%(mass). The maximum permeation fluxes of the ZIF-67/PDMS membrane are 3.61, 2.07 and 0.81 g·m^-2·h^-1, and the maximum separation factors are 115.5, 191.2 and 109.1 for 2-phenylethanol, damascenone and dihydroactinidiolide, respectively. The separation efficiency of the composite membrane for actual tobacco extract was investigated, and the average fluxes of the three aromatic compounds are 16.2, 11.6 and 9.8 mg·m^-2·h^-1, respectively.

Key words: pervaporation, PDMS, ZIF-67, neutral aromatic compounds, tobacco waste

摘要：

从废次烟草中分离中性香气组分是废次烟草资源化利用的重要途径之一。以聚偏氟乙烯（PVDF）为基膜，沸石咪唑酯骨架材料ZIF-67为改性填充物，制备了聚二甲基硅氧烷（PDMS）渗透汽化复合膜用于分离烟草的中性香气组分。采用SEM、FTIR、XRD和接触角测量仪等对复合膜材料进行表征，考察了复合膜对烟草中性香气组分的渗透汽化性能。结果表明，ZIF-67与PDMS基质为物理共混，膜的疏水性增强。随着ZIF-67添加量的增加，渗透通量和分离因子均先增大后减小。当填充量为5%（质量）时，复合膜的分离效果最佳，对2-苯乙醇、大马酮和二氢猕猴桃内酯的最大渗透汽化通量分别为3.61、2.07和0.81 g·m^-2·h^-1；最大分离因子分别为115.5，191.2和109.1。考察了复合膜对实际烟草提取液的分离效果，2-苯乙醇、大马酮和二氢猕猴桃内酯的平均渗透通量分别为16.2、11.6和9.8 mg·m^-2·h^-1。

关键词: 渗透汽化, 聚二甲基硅氧烷, ZIF-67, 中性香气组分, 废次烟草

CLC Number:

TQ 028.8

Yu LIU, Zhenbo CAI, Lijun JI, Xiaohua MA. Separation of neutral aromatic compounds from tobacco waste by ZIF-67/PDMS composite membrane[J]. CIESC Journal, 2025, 76(5): 2337-2347.

刘雨, 蔡振波, 纪利俊, 马晓华. ZIF-67/PDMS复合膜分离废次烟草的中性香气组分[J]. 化工学报, 2025, 76(5): 2337-2347.

Figures/Tables 13

Table 1 Physicochemical properties of 2-PE、damascenone and dihydroactinidiolide

化合物	分子量	沸点/℃	lgP	拓扑极性面积/Å²
2-苯乙醇	122.16	219	1.4	20.2
大马酮	190.28	275.6	4.04	17.1
二氢猕猴桃内酯	180.24	296.1	2.2	26.3

Fig.1 SEM images of the surface and the cross-section of PDMS with different ZIF-67 loadings

Fig.2 Water contact angle of ZIF-67 filled PDMS/PVDF membranes with various ZIF-67 loadings

Fig.3 XRD patterns of ZIF-67 and PDMS with different ZIF-67 loadings

Fig.4 FTIR spectra of ZIF-67 and PDMS with different ZIF-67 loadings

Fig.5 Effect of 2-PE concentrations (a) and immerse time (b) on swelling degree of ZIF-67/PDMS membrane

Fig.6 Effect of composite membranes with different ZIF-67 loading on pervaporation performance

Fig.7 Effect of temperature on pervaporation performance for aromatic compounds/water single systems [(a), (c), (d)] and ternary system(b)

Fig.8 Fitting lines of apparent energy in aromatic compounds/water single systems(a) and ternary system(b)

Fig.9 Fluxes (a), separation factor and PSI (b), permeability (c) and selectivity (d) of aromatic compounds/water binary system with different concentrations

Fig.10 Fluxes at different concentration ratios in the ternary systems of 2-PE/damascenone/water(a), 2-PE/dihydroactinidiolide/water(b) and damascenone/dihydroactinidiolide/water(c)

Fig.11 Fluxes in the continuous experiment of practical tobacco extract

Fig.12 GC/MS total ion current map of aromatic compounds in aqueous tobacco extract before and after pervaporation

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