ENERGY & FUELS
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2018
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IF 3.024
Na Rao,Mei Wang,Ziming Shang,Yanwen Hou,Guozhi Fan,Jianfen Li
Modifications by impregnation and grafting are commonly used for the preparation of amine-functionalized MCM-41. A comprehensive evaluation of the advantages and disadvantages of the two methods was performed in this work. MCM-41 was synthesized by the hydrothermal method, setting the amine-loading mass fraction at 40, 50, and 60 wt %. Three amine-modified adsorbents were prepared by impregnating polyethylenimine (PEI), and the three other adsorbents were prepared by grafting 3-aminopropyltriethoxysilane (APTS) onto MCM-41. The as-prepared adsorbents were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, and N2 adsorption–desorption techniques. CO2 adsorption capacities were measured, and the experimental data were fitted with adsorption kinetic models. The cyclic stability of the adsorbents prepared by the two kinds of amine-modified methods was compared using the cyclic adsorption–desorption experiments. The characterization results showed that the target adsorbents were prepared successfully. The thermal stability of the adsorbents modified by grafting was better than the thermal stability of the adsorbents modified by the impregnation. Maximum CO2 adsorption capacities of 3.53 mmol g–1 (50% PEI–MCM-41) and 2.41 mmol g–1 (50% APTS–MCM-41) could be reached at 25 °C and 1 atm, which were 4.7 and 3.2 times greater than that of MCM-41. The Avrami model fitted the experimental data well, indicating a variety of interactions between the adsorbents and CO2. CO2 adsorption capacity after 5 adsorption–desorption cycles decreased by 14.22 and 5.19% for the adsorbents prepared by impregnation and grafting, respectively. It was concluded that MCM-41 modified by impregnation and grafting followed the same kinetic model. The absorbents modified by impregnation showed higher CO2 adsorption capacity and amine-loading efficiency, while those prepared by grafting had better thermal and cyclic stabilities.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 1
·86
·
IF 3.4
Liang Wang,Tianjun Ni,Shiqin Wei
In this study, thymol was covalently connected to mesoporous silica nanomaterial by a post-grafting method to obtain a stable antibacterial system, thus overcoming the volatilization of thymol, prolonging the effective time of antibacterial action, and enhancing the antibacterial efficiency of thymol. It was proposed for the first time that such a synthetic route be adopted to synthesize silica-based mesoporous/essential oil antibacterial materials. The post-grafting method could be capable of retaining the mesoporous original structure, which could effectively avoid the porosity reduction and disordered products caused by condensation. Among them, the minimum bactericidal concentration (MBC) of functionalized MCM-41 (silica support) forE. coliandS. aureuswere 0.3 mg mL−1and 0.4 mg mL−1, which were equivalent to 3/4 and 4/5 of free thymol (0.4 mg mL−1and 0.5 mg mL−1), respectively. Meanwhile, the MBC of functionalized SBA-15 (silica support) forE. coliandS. aureuswere both 0.2 mg mL−1, which also reduced the MBC of free thymol. These results revealed thymol-functionalized mesoporous silica nanomaterial could efficiently improve the bactericidal activities of the organic component. Finally, the inhibition mechanism of the post-grafting strategy was also discussed, which referred to how the antibacterial material directly acts on the cell membrane, resulting in cell inactivation.Keywords:thymol;nano mesoporous materials;post-grafting method;antimicrobial activity
研究领域:
材料科学
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微生物学
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生物化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 17
·21202-21212
·
IF 3.056
Zhou Yaya,Ma Yibing,Sun Youyi,Qi Chunhong,Guo Guizheng,Xiong Zhiyuan,Liu Yaqing
A new class of robust superhydrophobic cotton fabric was prepared by chemically grafting method for removing oil from contaminated waters. Furthermore, the mechanical, chemical, and thermal durability of superhydrophobic cotton fabric was evaluated in detail. The superhydrophobic cotton fabric did not only showed excellent separation efficiency (ca.100%) and ultrafast separation rate (ca. 13,600 L/h m 2 ) but also exhibited excellent durability. Especially, the oil/water separation rate was almost 10 times than that reported in previous works. The work provides a new method to design and large-scale prepare oil/water separation materials with high performance for industrial use.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
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2012
·
IF 3.903
Bo Liu,Heng Liu,Chunhua Wang,Lulu Liu,Shujie Wu,Jingqi Guan,Qiubin Kan
Bifunctionalized material with organized pairs of carboxylic acid and primary amine structurally similar to β 3 -amino acid derivatives has been prepared through post-grafted approach. Then the organized acid–base bifunctionalized material and the base monofunctionalized material were used as catalysts in aldol reaction to study the influence of the acid–base geometry on acid–base cooperativity. The catalytic result using acid–base bifunctionalized material towards aldol reaction was almost as same as the result obtained with the monofunctional amino catalyst, indicating that cooperative activation is not able to act efficiently unless the acid and the base active centers are positioned with appropriate geometry for the aldol reaction (e.g. about 2.6 Å).
研究领域:
有机化学
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催化化学
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材料化学
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分子设计
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表面功能化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Tingting Li,Xiaohui Yang,Jiaojiao Qiao,Yang Liu,Ting Zhang
In order to improve the adsorption capacity of attapulgite, a novel composite adsorbent EDTA/CS-ATP was synthesized by integrating attapulgite (ATP), chitosan (CS), and ethylenediaminetetraacetic acid (EDTA) by hydrothermal carbonization and grafting method. Under optimized conditions, the composite adsorbent achieved a removal ratio of 92.46 % and an adsorption capacity of 66.31 mg/g for methylene blue (MB) removal. Characterizations revealed that introducing CS and EDTA to ATP enhanced the electrostatic and hydrophobic interactions of ATP, which is beneficial for MB adsorption. Kinetic and thermodynamics studies showed that the adsorption followed pseudo-second-order kinetics and the Langmuir model, indicating a chemisorption-driven monolayer binding mechanism. Hydrogen bonding, electrostatic attraction, and π-π interactions were identified as the key mechanisms contributing to MB capture. Notably, compared to traditional EDTA-based materials mainly used for heavy metal removal, the EDTA/CS-ATP composite has the multifunctional sites to match the cationic and aromatic structure of MB, exhibiting highly selective and efficient MB removal. This work presents an environmentally friendly and scalable strategy for treating wastewater contaminated with cationic dyes, offering a promising solution for practical applications in water purification.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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吸附技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）