SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Xiangqiong Wang,Naixin Wang,Hongxu Ni,Quan-Fu An
In this study, a facile strategy for in situ growth of covalent triazine frameworks (CTFs) membrane on α-Al 2 O 3 substrate was presented. An intact CTFs based composite membrane was obtained in a solvothermal growth process. The structure and property of the CTFs composite membranes were investigated. The results indicated that CTFs could grow in the pores of the α-Al 2 O 3 substrate to modify the transport channel. Due to the sieving effect of the CTFs aperture, the prepared CTFs composite membrane exhibited superior rejection for different types of dyes (>97%) with extremely low rejection for salts (<20%). Moreover, the CTFs composite membrane had a high permeability (448 L m −2 h −1 MPa −1 ) and good stability for dye desalination. This approach demonstrated the great potential of CTFs membranes for dye/salt separation.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiajun Zou,Yanjun Shao,Xinyu Hu,Haichuan Zhang,Shanshan Ye,Ji Li
Sieving effect of pores was key of mitigating the natural organic matters (NOMs) interference to selectively remove antibiotics from wastewater. Yet the pore structures of porous materials were varied and complicated, bringing huge difficulty for exploring the relationship between pore structure and sieving effect. To address this, three typical MCs were accurately synthesized to own the interconnected hierarchically-spherical pore ( ic -HSMC), interconnected ordered slit-like pore ( ic -SMC) and isolated ordered tubular pore ( is -TMC). Under the weak interference of humic acid, smaller uniform mesopore size has a stronger size-exclusion effect to sieve sulfamethoxazole (SMX) and large-molecular humic acid (HA), resulting in higher capacity retention rates (CRR) of >91% for ic -SMC (4.2 nm) and is -TMC (3.5 nm) than 84.4% for ic -HSMC (2.7–74.4 nm). With HA concentration increasing (15 mg·L −1 ), because more transport channels effectively mitigate the pore-blocking effect of HA, ic -HSMC and ic -SMC with interconnected pores showed a close CRR of ∼54% (only 44.6% of is -TMC with isolated pores). Notably, when HA concentration was much large to 30 mg·L −1 , the highest CRR of ic -HSMC still maintained at 50.9% (30.9% of is -TMC and 39.3% of ic -SMC), resulting from more external surface (45% S BET ) of hierarchically-spherical macropores to disperse HA and disordered channels to resist HA transport into internal adsorption sites. Above all, the internal pore structure of MCs (connectivity, shape and order degree) played a crucial role in mitigating the interference of NOM, providing a new perspective on porous adsorbents/catalysts design for highly-selective antibiotics removal from wastewater.
研究领域:
环境科学
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材料科学
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水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Rui Jiao,Yiwan Si,Wenjie Fan,Hanxue Sun,Jiyan Li,Zhaoqi Zhu,An Li
Considering the dangers of radioactive elements to the human body and the environment, the efficient and rapid removal of radioactive ions in water is an urgent matter. In this paper, an efficient adsorption material based on kinetic quantum sieving (KQS) effect through skillfully molecular design with specific space structure conjugated microporous polymer hollow spheres (CMPs-1) for disposal of radioactive iodide/cesium ions is reported. The adsorption properties of iodide/cesium ions at different concentrations at 10℃ were investigated. Moreover, the test results show that the iodide ions adsorption capacity of the CMPs-1 will increase with the increase of iodine ions concentration when the temperature, volume, and other conditions are fixed. The CMPs-1 exhibited up to the highest 16.93 mg g −1 iodide adsorption capacity for the solution containing 0.10 mmol L -1 iodide ions within 6 h under static adsorption experiments at a low temperature of 10℃, and the adsorption rate fitted by the pseudo-second-order kinetic model was 0.11 g mg -1 h −1 . Besides, the CMPs-1 maintained an effective adsorption capacity of 16.93, 7.51 and 5.92 mg g -1 at pH = 7, 10 and 13, respectively. Furthermore, unexpectedly, the constructed CMPs-1 showed superior heat resistance with higher adsorption capacity (26.32 mg g -1 , 1.6 times) at 30℃ compared to 10℃. The improvement reason is that the expansion of pores (significantly increased at 4–20 nm), and the developed porosity can provide enough space to accelerate the diffusion rate of reactants and intermediates, exposing more active sites. And the π-conjugated system and hollow structure of CMPs materials can effectively solve the problem of low diffusion rate caused by low temperature and microporous structure in the transfer of iodide/cesium ions. Therefore, this work demonstrates the customizable potential of materials in the field of molecular adsorption applications and also provides a new idea for the design of unique hollow structure adsorption materials.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiawu Huang,Cuiting Yang,Shengjun Du,Lin Zhu,Zhenglin Du,Guang Miao,Chunshan Song,Jing Xiao
Adsorption-based capture of carbon dioxide (CO 2 ) to upgrade natural gas offer a promising solution for energy crisis and the reduction of CO 2 emission. However, trade-off between high adsorption selectivity and rapid kinetic is an inherent shortcoming of size-sieving based adsorptive separation of gas molecules at similar sizes, hindering the launch of sieving adsorbent for practical challenging selective gas capture. Herein, a gradiently porous carbon nanofiber PCF-800 with interconnected sieving ultramicropores and low-proportion surficial mesopores is tailor-made to simultaneously realize the exclusive and rapid capture of CO 2 from CH 4 . Arising from the unique interconnected micro-mesoporous structure, the as-prepared PCF-800 not only achieves remarkable uptake ratio of 45 (298 K, 1 bar) for CO 2 /CH 4 separation via size-sieving effect but also shows fast kinetic with diffusion rate of 1.35 × 10 -3 s −1 , outperforming the conventional ultramicroporous counterpart. Moreover, the impressive dynamic CO 2 /CH 4 separation factor up to 21.7 and satisfying cycling durability revealed by the breakthrough experiments further imply the industrial potential of PCF-800 in practical CH 4 purification. This work may shed light on the design of gradient sieving carbonaceous adsorbent with high selectivity and fast kinetic for extensive high-performance small gas separation.
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
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-19
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IF 36.3
Kang Xiaoya,He Tianqi,Dang Hao,Li Xiangye,Wang Yumeng,Zhu Fuliang,Ran Fen
Shuttle effect of polysulfides overshadows the superiorities of lithium–sulfur batteries. Size–sieving effect could address this thorny trouble rely on size differ in polysulfides and lithium ions. However, clogged polysulfides pose some challenges for cathode and are rarely recycled during charging/discharging. Herein, an amino functionalized titanium-organic framework is designed for modifying lithium–sulfur batteries separator to address the aforementioned challenges. Wherein, the introduction of amino narrows titanium–organic framework pore size, enabling functional separator to selectively modulate lithium ions and polysulfides migration using size-sieving effect, thereby completely suppressing polysulfides shuttle. Furthermore, the blocked polysulfides will be adsorbed on the separator surface by positively charged amino leveraging electrostatic adsorption, ensuring polysulfides to redistribute and reuse, and boosting active materials utilization. Significantly, the migration of lithium ions is not hindered since there are lithium ions transfer channels formed via Lewis acid–base interaction with the help of amino. Combined with these virtues, the lithium–sulfur batteries with amino functionalized titanium-organic framework modified separator enjoy an ultralow attenuation rate of 0.045% per cycle over 1000 cycles at 1.0C. Electrostatic adsorption and Lewis acid–base interaction cover deficiencies existing in the inhibition of polysulfides shuttle by size-sieving effect, providing fresh insight into the advancement of lithium-sulfur batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Zeyu Chang,Xiaoxia Jia,Tong Li,Yong Wang,Libo Li
In the petrochemical industry, the separation of C4 olefins is crucial but a challenging and energy-intensive process. In this study, two fluorinated anion-pillared hybrid ultramicroporous materials (HUMs), namely KAUST-7 (NbOFFIVE-1-Ni) and KAUST-8 (AlFFIVE-1-Ni), were explored for the efficient separation of ternary C4 olefin mixtures (C 4 H 6 /n-C 4 H 8 / iso -C 4 H 8 ) via gate-opening and size-sieving effects. KAUST-7, with a narrow and flexible pore window that completely excludes iso -C 4 H 8 , but allows for the absorption of C 4 H 6 and n-C 4 H 8 through gate-opening effects, with a preferential adsorption of C 4 H 6 due to its easier access to the channel. KAUST-8, on the other hand, with a larger pore window size and the strong H-bond interactions between the electronegative fluorine atoms from inorganic anion pillar and the C4 olefin molecules, efficiently separates iso -C 4 H 8 from C4 olefins, as the adsorption of both C 4 H 6 and n-C 4 H 8 is significantly enhanced while iso -C 4 H 8 retains much lower adsorption capacity. The relationship between the structures and separation properties of these materials is discussed, providing insight into the development of efficient separation materials. Fixed bed breakthrough experiments verify the excellent separation performances of KAUST-7 and KAUST-8 for C 4 H 6 /n-C 4 H 8 / iso -C 4 H 8 , highlighting their potential for industrial applications.
研究领域:
材料科学
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石油化工
·
吸附分离技术
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Qi Shen,Ding Yu Xing,Feiyun Sun,Wenyi Dong,Fengjiao Zhang
Thin film nanocomposite membranes have become a feasible technology for heavy metal wastewater treatment . However, how to enhance the dispersibility and compatibility of nanomaterials in the selective layer is an important issue to improve the membrane performance of heavy metal removal . In this study, silica-poly(ionic liquid) nanoparticles were incorporated in the selective layer of TFN membranes. 1-Allyl-3-methyl imidazolium hexafluorophosphate ([AMIm]PF 6 ) was selected to modify silica (SiO 2 ) particles. The formed poly([AMIm]+) brushes provided charge properties to enhance dispersibility and organic part to improve compatibility in the polyamide layer of NF membranes. The resultant TFN membranes incorporated with SiO 2 -[AMIm]PF 6 particles exhibited an increment of 34% water permeation and 41.6% MgCl 2 rejection. Moreover, with an average rejection improvement of around 15% for heavy metal ions at pH = 5–6, the SiO 2 -[AMIm]PF 6 /PA membrane showed its superiority beyond the PA membrane. The electropositivity and microporous structure of the SiO 2 -[AMIm]PF 6 particles enhanced their dispersibility and compatibility in the polyamide layer. Meanwhile, the proper pore size and structure of the SiO 2 -[AMIm]PF 6 particles contributed to the channels for water transport and the sieving effect for most heavy metal ions. This work may facilitate the applications of TFN membranes in heavy metal wastewater treatment to alleviate the “trade-off” phenomenon.
研究领域:
环境工程
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材料科学
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水处理
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纳米技术
✓ 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）