INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Yueyangchao Yu,Yanting Tang,Longjie Liu,Qingnan Wang,Chongshan Yin,Keming Zhang,Chenlu Liu,Yi Ye,Xinglei Zhao,Tianhe Gu,Shaofei Wang
Covalent organic frameworks (COFs) show exceptional promise for CO2-selective mixed matrix membranes (MMMs) due to their tunable porosity and structural robustness. To mitigate COF aggregation in MMMs, we present an in situ growth strategy by directly integrating COF precursors into a polymer matrix. By optimizing reaction conditions, we achieve uniform dispersion and successful in situ formation of TpPa (derived from 1,3,5-triformylphloroglucinol and p-phenylenediamine) within the Pebax matrix. The optimized membrane exhibits a high CO2 permeability of 313.4 Barrer (45.8% higher than pure Pebax) and CO2/N2 selectivity of 22.6, along with long-term stability. Positron annihilation lifetime spectroscopy further reveals how the integration of COFs modulates the membrane’s free-volume properties. This study not only addresses filler dispersion challenges but also provides a viable approach for fabricating high-performance, stable CO2 separation membranes.
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
DESALINATION
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2024
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IF 8.3
Lin Yu,Aida Aibulatova,Zhen-Liang Xu,Li Li,Changqing Hao,Rui Jia,Yin-Xin Fang,Yan Zheng,Yong-Jian Tang
Covalent Organic Framework Materials (COFs) nanofiltration (NF) membranes have extensive applications in the field of separation. In this work, high performance TpPa COFs NF membranes were prepared with catalyst pre-diffused strategy. The catalyst pre-diffused method can let catalyst attached to the membrane surface, which can promote the formation of intermediates first, and then form a complete COFs separator layer in 30 min. The optimized membrane possesses an excellent performance of CR permeability of 97.57 L⋅m −2 ⋅h −1 ⋅bar −1 with a rejection of 99.25 % for CR. The dye/salt separation selectivity α was up to 480.16 (EB-T/NaCl). This markedly decreases the reaction duration for membrane production and enhances preparation efficiency. Consequently, the catalyst pre-diffusion strategy offers an innovative approach for the fabrication of COFs nanofiltration membranes.
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
Materials
·
2025
·Vol. 18
·期 8
·1874
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IF 3.2
Chao Wu,Haoyan Zhang,Xuan Zheng,Jing Ding,Yuanyuan Li,Feiyong Chen,Zhengfeng Zhao
The urgency of reducing pollution and developing clean energy storage requires efficient photocatalytic hydrogen evolution (PHE) tactics. To improve solar conversion efficiency, it is highly imperative to accelerate the photocarriers separation and transport through materials design. A stable hydrogen evolution photocatalyst based on TpPa-COFs (triformylphloroglucinol phenylenediamine covalent organic frameworks) was developed by a molecular-level design strategy. The study successfully introduced a molecular-scale Ir active site onto the surface of TpPa-COFs via coordination bonds. It verified the structural integrity of TpPa-COFs and the existence of Ir through the basic structural characterizations, such as Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). After the Ir-based coordination compound joining, the absorption edge of TpPa-COF-M1 and TpPa-COF-M2 was extended to 750 nm. The TpPa-COF + M1 exhibited the highest photocatalytic H2evolution rate of 662 µmol/h (10 mg catalyst) under visible-light (λ ≥ 420 nm) irradiation. The apparent quantum yield (AQY) of TpPa-COF-M1 is calculated to be 1.9%, 3.8%, 4.8%, 2.8%, 1.8%, and 0.3% at monochromatic wavelengths of 420, 450, 470, 500, 550, and 600 nm, respectively. Our findings confirm that the molecular-level design of photocatalysts can effectively boost performance and reduce cost in photocatalytic reactions and provide an important strategy for designing efficient photocatalysts.
研究领域:
材料科学
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能源化学
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光催化
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Yuan Li,Biao Pei,Junjie Chen,Shaosuo Bing,Linxiao Hou,Qi Sun,Gang Xu,Zhikan Yao,Lin Zhang
A novel catalyst with a yolk-shell structure was designed to overcome the leaching of noble metals in heterogeneous catalysis. Through a template method, palladium (Pd) nanoparticles were encapsulated by hollow spherical covalent organic frameworks (COFs) consisting of 2,4,6-trihydroxybenzene-1,3,5-tricarbaldehyde (Tp) and p-phenylenediamine (Pa). The final catalyst with a yolk-shell structure was denoted as (Pd/C)@TpPa COFs. The unique morphology and chemical structure of this novel composite (Pd/C)@TpPa COFs were confirmed by a transmission electron microscope (TEM), a laser particle analyzer, X-ray diffraction (XRD), and N 2 adsorption and desorption. Subsequently, to demonstrate its catalytic performance brought by structural design, this novel catalyst was applied to catalyze the Suzuki reaction . Interestingly, this catalyst exhibited a brilliant size cutoff efficiency for aryl benzene amounting to 100% and achieved a high conversion with only 0.05 mol% Pd loading. Besides, this catalyst could be readily recovered via filtration and reused for at least five consecutive cycles without any significant loss in its activity.
研究领域:
化学
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材料科学
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Changzhe Zhou,Haojie Li,Longlong Wang,Tao Fu,Guangli Liu,Xiaoran Shen,Huazhang Zhao
Polyester membranes are increasingly utilized in wastewater treatment due to their chlorine resistance. Nonetheless, they face challenges such as limited permeability. The integration of covalent organic frameworks (COFs) can significantly enhance the performance of nanofiltration membranes. However, the heterogeneous dispersion of COFs in solution results in poor compatibility with polyester membranes, leading to increased membrane defects and compromising nanofiltration performance. This study presents the development of COFs-polyester hybrid membranes via a simple one-step in-situ co-polymerization method. During the interfacial polymerization (IP), p-phenylenediamine (Pa) and 1,3,5-triformylphloroglucinol (Tp) were integrated into a β-cyclodextrin (β-CD) aqueous solution and a trimesoyl chloride (TMC) organic solution, respectively. The uniform dispersion of COFs monomers within the IP monomer solution addressed heterogeneity issues, improving compatibility with polyester membranes. The in-situ co-polymerized COFs not only enhanced the sieving capabilities but also improved the hydrophilicity, and free volume of the membranes. The optimized membranes demonstrated a permeance of 105 L/m 2 ·h·bar, with rejection rates of 98.5 % for Congo red and 6 % for Na 2 SO 4 . Moreover, these membranes exhibited remarkable resistance to chlorine, organic solvents, and antifouling capabilities. This study offers novel insights into the application of COFs in polyester membranes, providing a straightforward, cost-effective, and scalable integration strategy.
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
危险品化学品经营许可证（带存储）