JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Bei-Na Dong,Liu-Yang Gong,Li Xia,Nian Zhang,Li-Fen Liu
In this study, a new kind of wholly-Tröger's base-based polyamide ( w TB-PA) thin film composite (TFC) nanofiltration (NF) membrane was successfully fabricated for the separation application in strong acidic condition via the acid-induced segregation (AIS) effect. Firstly, the self-synthesized Tröger's base diamine monomer — 2,8-diamino-4,10-dimethyl-6H,12H-5,11-methanodibenzo [1,5]-diazocine (TBDA) was added in the polyethersulfone (PES) casting solution to prepare the TBDA-based PES substrate by synchronously coupling the non-solvent-induced phase transformation (NIPs) and AIS, and then the TBDA molecules on the PES substrate surface further reacted with trimesoyl chloride (TMC) via interfacial polymerization (IP) to obtain the w TB-PA TFC NF membranes. Meanwhile, the acid-induced segregation effect of on the microstructure and separation performance of the w TB-PA TFC NF membrane were systematically investigated. As compared with the conventional poly(piperazine amide) NF membrane (M PIP-TMC ), the w TB-PA NF membranes exhibited thinner, smoother but more hydrophobic surface as well as lower isoelectric point, and especially showed much higher tolerance to 20 wt% H 2 SO 4 after soaking 63 days and favorable dye rejection (～99.9 %). Thereinto, the acid segregation agent of citric acid monohydrate (CA) endowed the w TB-PA TFC NF membrane with relatively optimal acid resistance and SO 4 2− /Cl − separation selectivity (about 11.8) than glacial acetic acid (AC), nitric acid (HNO 3 ) and hydrochloric acid (HCl). Moreover, this w TB-PA NF membrane based on CA-induced segregation had higher recovery of the cationic dye of crystal violet (CV) (＞98.0 %) in acidic condition. Therefore, the w TB-PA TFC NF membranes have great potential for the separation application in the strong acidic condition in the future.
研究领域:
材料科学
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化学工程
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环境科学
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高影响因子
Analytical Methods
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2024
·Vol. 16
·期 7
·1012-1020
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IF 2.7
Gang Xiang,Wensi Xu,Wenfeng Zhuge,Qing Huang,Cuizhong Zhang,Jinyun Peng
Isoniazid is a first-line drug used to treat tuberculosis. However, its excessive use can lead to serious adverse effects. Thus, strict monitoring of the isoniazid levels in medications and human systems is required. In this study, a new polymer (AlPc-TB POP) containing a metal phthalocyanine and Tröger's base was synthesized and explored as an electrocatalyst for the oxidation of isoniazid. The results indicated that the polymer is an excellent electron-transfer medium for isoniazid oxidation. The AlPc-TB POP-based sensor quantified isoniazid in the linear range of 0.1–130 μM, with a detection limit of 0.0185 μM. The response of the developed sensor to isoniazid was reproducible and stable. Furthermore, this method can accurately determine isoniazid levels by ignoring the influence of common interfering species in tablets and biological samples. This study contributes to the development of nitrogen-rich porous organic polymers and offers a novel strategy for addressing challenges in disease therapeutic efficacy and public safety monitoring.
研究领域:
分析化学
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药物分析
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生物医学工程
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DOI
PubMed
高影响因子
DESALINATION
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2022
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IF 11.211
Tian-Hui Chen,Ting Su,Li Xia,Liu-Yang Gong,Bei-Na Dong,Li-Fen Liu
In this study, a kind of Tröger's base (TB) polymer of intrinsic microporosity (PIM) was proposed to adjust both the micro-structure and macro-performance of the thin film composite (TFC) polyamide nanofiltration (NF) membrane. First, a rigidly-contorted Tröger's base (TB) diamine monomer — 2,8-diamino-4,10-dimethyl-6H,12H-5,11-methanodibenzo [1,5]-diazocine (TBDA) was synthesized (Yield: 90.2 %), and then was incorporated with piperazine (PIP) to react with trimesoyl chloride (TMC) monomer via the coupling of phase inversion and interfacial polymerization for constructing the TB-PIM-based polyamide (PA) selective separation layer. Especially, the NF membrane (TFC-TBDA/PIP) fabricated with 1/1 of TBDA/PIP and 0.075 ( w / v ) % TMC exhibited particular “corolla-like” morphology with high microporosity, thinner selective layer <55 nm. Under neutral condition, this membrane surface also is more negatively charged. These features further endowed this membrane superior permeability and selectivity . It showed about 2-fold water flux (87.67 L·m −2 ·h −1 ) of the conventional NF membrane (TFC-PIP) without sacrificing the multivalent sulfate salt rejections of Na 2 SO 4 and MgSO 4 , and meanwhile the MgSO 4 rejection was about 4.3 times as much as MgCl 2 . Moreover, the XPS results also revealed that there was nearly no chemical structure change of TB-PIM-based polyamide after acid soaking. Therefore, this study provides an effective way to fabricate the high-performance TFC nanofiltration membrane.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Tingting Huang,Jiulong Yin,Hai Tang,Ze Zhang,Di Liu,Shasha Liu,Zhaozan Xu,Nanwen Li
Tröger's base polymer (TB) has been proved to be applicable to prepare ultrafiltration (UF) membrane and the antifouling property could be improved by hydrophilic modification of TB polymer via a two-step ring-opening reaction transforming the tertiary amine into water-affinitive secondary amine. To improve the permeability and antifouling performance of TB-based UF membrane, a zwitterion-modified Tröger's base polymer (ZTB) was synthesized via one-step reaction and simply blended into the TB membrane matrix. The chemical structure of ZTB was characterized by 1 H NMR and X-ray photoelectron spectroscopy (XPS). The TB/ZTB blend polymers and membrane showed higher hydrophilicity than the pristine TB polymer and membrane. The pore structure can be adjusted via ZTB blending content by affecting the cloud point of casting solution and membrane formation process during non-solvent induced phase separation. The total porosity and average surface pore size of UF membrane were increased by blending ZTB. The permeability and retention factor for BSA of UF membrane were simultaneously enhanced. The static BSA adsorption of UF membrane was reduced from 90.6 μg/cm 2 of the pristine TB membrane to 46.8 μg/cm 2 of TB/ZTB-1.0 membrane. The higher flux recovery ratio of TB/ZTB blend membrane than pristine TB membrane after three fouling-cleaning cycles further demonstrated the enhanced antifouling ability of the TB/ZTB blend membrane. Therefore, the zwitterionization of TB polymer is a feasible method for the permeability and antifouling property enhancement of TB-based UF membrane.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
POLYMER
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2022
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IF 4.432
Junbo Yue,Jingjing Hou,Yixuan Li,Yanqin Yang,Lu Han,Shuzheng Sun,Jingde Li
Here we report the synthesis of branched Tröger's base polymers ( x -BTB) with different degree of tetraphenylmethane branch structure by incorporating varied amounts of tetrakis(4-aminopheny)methane into the main chains of Tröger's base polymer (TB). We show that branching increases porosity of x -BTB, leading to improved gas permeability . Specifically, the BET surface area and pore volume of x -BTB polymers increase continuously from 410 to 544 m 2 g −1 and 0.584–0.607 cm 3 g −1 , respectively, for branched polymers containing progressively more branch structure. For CO 2 /N 2 , CO 2 /CH 4 , and O 2 /N 2 binary gas separation, a significant improvement in the gas permeability without obvious compromising the membrane selectivity is observed on the x -BTB membranes with higher branch degree. In particular, for CO 2 /N 2 binary gas separation, the CO 2 permeability of 5 wt%-BTB membrane is 145 Barrers, creating an enhancement of 64.8% as compared to TB membrane. Moreover, x -BTB membranes are much more resistant to physical aging than TB membrane. These results suggest that introduction of tetraphenylmethane branch structure is an effective strategy to fabricate polymeric membranes with high performance suitable for gas separation applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
ChemistrySelect
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2024
·Vol. 9
·期 11
·e202400114
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IF 1.9
Jin Liang,Xiaoxin Wang,Dongsheng Yu,XiTao Luo,Xiangfeng Liang,Zhongliang Su,Qinghui Shou
Graphical Self-supported osmotic membranes were prepared by blending PIM-1-mPEG, which was obtained by modifying PIM-1 with polyethylene glycol monomethyl ether (mPEG), and hydrophilic Tröger's base polymer (DMBP-TB). The membranes utilized microporous molecular sieves and the differences in solute-membrane interactions to achieve high pentose/hexose selectivity in aqueous solutions. Monosaccharides are vital building blocks in bioengineering applications; however, their extraction from intricate mixtures is challenging and uses substantial amounts of energy. Polymers of intrinsic microporosity (PIMs) offer an innovative avenue for separating monosaccharides. We modified PIM-1membranes to improve the glucose/xylose separation by incorporating polyethylene glycol monomethyl ether (mPEG). The optimal mPEG (molecular weight: 1000 Da; mass fraction: 2.5 %; solvent: methanol) delivered a xylose separation coefficient of 2.62. With the hybrid membrane of PIM-1-mPEG (50 w.t.%) and hydrophilic Tröger's base polymerer (DMBP-TB, 50 w.t.%), the separation factor for xylose/glucose in an aqueous solution was 2.51 for single-stage running and 11.32 after five-stage running. There are large fractions of micropores for PIM-1-mPEG, and there is difference on solute-membrane interactions for pentose/hexose, which are regarded to be the main driving force for the high pentose/hexose selectivity in methanol. The blending of PIM-1-mPEG and DMBP-TB, integrates the microporosity and hydrophilicity, finally endues the high pentose/hexose selectivity in aqueous solution. These microporous membranes are promising materials for efficiently separating monosaccharides and jnl> small organic molecules while minimizing energy consumption. We established a solid foundation for further exploring microporous membranes for various applications, notably in bioengineering.
研究领域:
生物工程
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材料科学
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分离技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Chenglong Yang,Shuqi Liu,Qiyue Zhao,Xinfan Zhang,Zhenggong Wang,Feng Zhang,Jian Jin
Organic solvent nanofiltration (OSN) membranes with precise molecular-sieving performance have become increasingly important in chemical and pharmaceutical industries, desiring superior membranes with both high permeability and selectivity. Herein, the V-shape Tröger's base (TB) structure is incorporated in the polyamide network to engineer microporosity as well as the molecular-sieving performance of the thin-film composite (TFC) polyamide membrane for organic solvent nanofiltration (OSN). The TFC membrane containing the TB structure features a rigid and contorted chain structure, which affords high and stable methanol permeability in OSN applications. Furthermore, the H-bond interaction between the H of amide groups and N in TB reinforces the interchain interaction, endowing the membrane with a precise selectivity to organic solutes. The as-prepared TFC membrane demonstrated high methanol permeance of 16.6 L m −2 h −1 bar −1 and sieving performance to organic molecules with molecular weight cut-off (MWCO) down to 349 Da. Furthermore, the membrane demonstrates shape selectivity for organic solutes, exploiting the fine microporous structure. This study may provide insights into the molecular design of TFC membranes by finely tuning the molecular features for precise solute separations.
研究领域:
材料科学
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化学工程
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分离技术
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DOI
高影响因子
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