JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Huimin Wang,Jiajia Gui,Fei Huang,Congjie Gao,Lixin Xue
A simple liquid-solid interface polymerization (LSIP) strategy was developed to prepare high performance polyamide (PA) based thin film composite (TFC) total heat exchange membranes (THEMs) to avoid the use of organic solvents and surfactant during the inverse phase interface polymerization processes between piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC) on porous polyethylene (PE) substrates. The non-polar organic solvent in the TMC organic phase coated on the surface of the PE surfaces was completely removed beforehand by evaporation to form polar TMC solid coating on the PE surfaces and facilitate the quick spreading of lately added aqueous PIP solutions, forming dense and highly cross-linked PA separation layers with superior total heat recovery efficiency and CO 2 barrier property. The effects of TMC loading level, PIP concentration, and LSIP reaction time on the structure and performance of PA/PE-TFC THEMs were systematically investigated, leading to the formation of THEMs 0.20P-0.10T-6 with ultra-low CO 2 permeance of 0.9 GPU , and high sensible heat exchange efficiency of 94.3 %, water vapor flux of 2128 g m −2 ·24 h −1 , and enthalpy exchange efficiency of 76.8 %.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Shiyang Li,Longdou Tu,Yeqiang Lu,Mingjie Lin,Junmei Ma,Chaojie Bai,Congjie Gao,Lixin Xue
A novel strategy was developed to build high-performance thin film composite (TFC) total heat exchange membranes (THEMs) by in situ growing ZIF-8 crystalline micro-leaves (ZIF-L) from Polyethyleneimine (PEI) coated on polysulfone (PSF) ultra-filtration substrates. It was found that flexible PEI polymeric chains could tightly cross-link and seal large masses of ZIF-L micro-leaves (ZIF/PEI wt. ratio up to 18.5) to thwart CO 2 permeation, on top of PSF substrate. Such PEI cross-linking could also effectively open up the internal channels of ZIF-L micro-leaves to enhance moisture permeance and latent heat recovery without trading off CO 2 gas barring property. ZIF-L in varied shapes protruded into the air stream could provide ultra-rough surfaces with increased surface area for improved total energy recovery efficiency. Optimized PEI/ZIF-L TFC THEMs showed ultra-low CO 2 permeance of 0.5–8 GPU and ultra-high total heat recovery rates of 68–74%.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chaojie Bai,Yang Gao,Zuoqun Zhang,Longdou Tu,Dajian Cai,Zixuan Lv,Congjie Gao,Lixin Xue
It is an important initiative to reduce the building energy consumption using energy recovering ventilation (ERV) systems. The application of ERV systems is hindered by the low CO2 barrier performance of commercial total heat exchange membranes (THEMs) that lead to unsatisfactory indoor air refreshing rate, and there is an urgent need for THEMs that have improved CO2 barrier properties and effective energy recovery efficiencies. Here, we report the formation of novel ZIF/PA TFN THEMs based on ZIF-7-X nanoparticles (NPs) with “core–shell” structures and tunable particle sizes, formed from benzimidazole (BIM) ligands and BIM substituted by −NH2, −CH3, −C2H5, and −C3H7 functional groups. The NPs were mixed with pyr omellitic triformyl chloride (TMC) in the organic phase during the interface polymerization process to form ZIF/PA TFN membranes. The total heat exchange performance of ZIF/PA TFN membranes could be effectively modified by the type and quantity of ZIF-7-X NPs added. The CO2 barrier properties and water vapor permeability of ZIF/PA TFN membranes could be improved by the addition of optimal levels of ZIF-7-X NPs, showing low CO2 permeance of 7.76 GPU, high H2O permeance of 663.8 GPU, and excellent enthalpy exchange efficiency of 72.1%. This work provided an effective strategy for tuning not only the nanostructures of ZIF-7 fillers but also the CO2 barrier properties of the formed ZIF/PA TFN membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xian Chang,Zixuan Lv,Hang Yu,Shiyang Li,Guojun Jiang,Congjie Gao,Lixin Xue
Thin Film Composite Polyamide (TFC-PA) Total Heat Exchange Membranes (THEMs) with ultrahigh sensible heat exchange efficiency, high enthalpy exchange efficiency, high CO 2 gas barrier property were successfully prepared by interfacial polymerization between m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The performances of formed THEMs could be greatly impacted by their surface roughness , thickness, surface hydrophilicity, cross-linking degree and counter-ions retention controlled by the MPD concentration, TMC concentration, reaction time and post treatment procedures. Their H 2 O permeation coefficient could be improved by increasing the surface hydrophilicity and decreasing cross-linking degrees of the formed polyamide layers while their CO 2 barrier property could be improved by retaining more counter ions in PA layers. THEMs with ultrahigh sensible heat exchange efficiency of 95%+, high enthalpy exchange efficiency of 60%–65%, greatly improved CO 2 barrier property and superior mechanical strengths could be obtained for potential applications in ERV systems.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2023
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IF 5.1
Zixuan Lv,Huimin Wang,Shiyang Li,Chaojie Bai,Mingjie Lin,Congjie Gao,Lixin Xue
Thin film nano-composite polyamide (TFN PA) total heat exchange membranes (THEMs) containing ZIF-7, ZIF-8, ZIF-9 and ZIF-67 particles (PTs) introduced during interface polymerization process were prepared. A novel integrated online testing system was established to simultaneously evaluate their CO 2 and moisture exchange rates as well as energy recovery efficiencies. ZIF PTs added in water phase improved the CO 2 barrier property of the THEMs due to their good dispersion in water, the coordination of the excess cations on their surfaces with the –NH 2 groups of MPD from the PA matrix and partially by increasing the PA layer thickness. Addition of ZIF PTs in organic phase showed variety of effects on the CO 2 barrier property of the THEMs depending on their dispersion, structure rigidity, and interaction with the PA polymer matrix. Adding 0.01 g/144 cm 2 of ZIF-67 in aqueous phase and 0.02 g/144 cm 2 of ZIF-9 in organic phase could form TFN membranes with improved CO 2 barrier property without sacrificing energy recovery efficiencies. ZIF-9 addition in organic phase formed ZIF/PA TFN THEMs with the highest total heat recovery rates of 72% and lowest on-line CO 2 exchange rates of 1.7%. The newly obtained online CO 2 exchange rates (h CO2 ) were found to have good correlation with the off-line CO 2 permeance values (PER CO2 ), ηCO 2 = ln (PER CO2 )%-0.005, with a high Pearson's R value of 0.9914. There was also a linear correlation between the permeation selectivity obtained online (DS H2O/CO2 ) and calculated offline (IS H2O/CO2 ), IS H2O/CO2 = 0.289*DS H2O/CO2 +14.4, with an excellent Pearson's R values of 0.9942. The integrated testing system could give more realistic evaluation for novel THEMs with a lot less efforts.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）