Materials Today Communications
·
2024
·
IF 3.7
Cheng-rui Xie,Yi-xuan Song,Gang Yang,Cheng-gong Sun,Xiang Luo,Tao Wu
The increasing presence of synthetic dyes in wastewater poses a serious environmental threat, necessitating the development of efficient adsorbents for their removal. In this study, a highly porous carbonaceous adsorbent, Fe@C-350, was synthesized through direct carbonisation of MOF-235 under an argon atmosphere for efficient removal of methyl orange from wastewater. Compared to MOF-235, Fe@C-350 retains the inherent structure of MOF-235 while exhibiting a larger BET surface area and increased pore size. The use of Fe@C-350 as an adsorbent in methyl orange adsorption demonstrates exceptional adsorption capabilities over a broad pH range with a maximum adsorption capacity of 1666.7 mg·g −1 . The isotherm analyses indicate that the adsorption process is primarily determined by monolayer physical adsorption. The kinetic studies revealed a rapid adsorption rate, characterized by a high-rate constant of 0.025 g·mg −1 ·min −1 . This can be attributed to the suitable pore size and abundant adsorption sites that facilitate the removal of methyl orange. Further investigation confirmed that Fe@C-350 retained over 98 % of its initial adsorption capacity after 10 regeneration cycles, thus confirming physical adsorption as the fundamental mechanism. Based on these findings, it can be concluded that Fe@C-350 is of significant potential as a promising candidate for the efficient removal of methyl orange from dye-containing wastewater. However, future research is necessary to show its application to the removal of a broader range of contaminants, aiming at enhancing its environmental impact and industrial viability.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mengmeng Zhang,Ximei Hu,Lisha Mei,Li Zhang,Xiao Wang,Xiaochen Liao,Xiuwen Qiao,Chenglin Hong
Conventional electrochemical immunosensors use electroactive materials often suffer from leakage of electroactive materials and signal instability. To solve this problem, this paper proposes an electrochemical immunosensor based on MOF-235 adsorption aggregation signal amplification strategy for the sensitive detection of PSA. Methylene blue (MB) is a cationic dye with redox properties. It has electrochemical reversibility, high electron transfer rate and good biocompatibility. Therefore, it is often used as an electroactive substance in electrochemical immunosensors. However, the non-specificity and poor stability of MB will inevitably distort the diagnostic results and limit its application. In this experiment, MOF-235, a fluffy metal porous MOF material with two carboxyl groups has been prepared and it has a large specific surface area and good biocompatibility. Meanwhile, it can generate electrostatic attraction with the amino groups on MB, and firmly fix methylene blue on the MOF material, which can effectively prevent the signal leaks of MB during the test, and after being adsorbed, the reunion of MB can be controlled, which is conducive to electron transmission thus amplifying the electrical signal. The produced electrochemical immunosensor has good stability and repeatability, and the concentration of the analyte is directly linear with the magnitude of the electrical signal. Under optimum conditions, the proposed immunosensor shows a wide detection range from 10 pg·mL −1 to 1200 pg·mL −1 with a low detection limit of 3 pg·mL −1 .
研究领域:
生物医学工程
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分析化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Long Wang,Xia Lu,Yan Zhang,Yuxin Wang,Yi Ding,Mengjia Liu,Shangchen Fu,Wupeng Ge
In this work, a simple, convenient and cost-effective colorimetric aptasensor was successfully constructed for the detection of antibiotic residues in raw milk based on the property that aptamer (Apt) synergistically enhances the catalase-like activity of MOF-235. Under optimised conditions, the proposed colorimetric aptasensor exhibited a wide detection range (15–1500 nM) with a low detection limit (6.92 nM). Furthermore, the proposed aptasensor demonstrated high selectivity, good resistance to interference and storage stability. The proposed aptasensor was validated by spiking recovery in camel milk, cow milk and goat milk with satisfactory recoveries, which demonstrated the great potential of the aptasensor for further application in real food samples, and also suggested that MOF-235 can be used as a potential universal platform to build a sensitive detection platform for other targets.
研究领域:
分析化学
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食品科学
·
生物传感技术
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 32
·12563-12569
·
IF 3.069
Huixiao Duo,Xiaofeng Lu,Shuai Wang,Licheng Wang,Yong Guo,Xiaojing Liang
Herein, a novel, fusiform-like magnetic metal–organic framework material (Fe3O4-NH2@MOF-235) was fabricated by a facile two-step solvothermal approach. Then, Fe3O4-NH2@MOF-235 was applied as an adsorbent in magnetic solid-phase extraction (MSPE) coupled with high-performance liquid chromatography (HPLC) for the simultaneous extraction and determination of five kinds of benzoylurea insecticides (flufenoxuron, chlorbenzuron, teflubenzuron, diflubenzuron and triflumuron) from honey, fruit juice and tap water samples. Moreover, potential variables influencing the MSPE efficiency were optimized. Under the optimized conditions, an excellent linearity was achieved in the range of 1.0–300.0 μg L−1 for teflubenzuron and flufenoxuron and 2.0–300.0 μg L−1 for diflubenzuron, chlorbenzuron and triflumuron, with the correlation coefficients of 0.9991–0.9995. The limits of detection for the analytes were 0.25–0.5 μg L−1, and the recoveries at three fortified concentration levels ranged from 76.45% to 90.74% for the honey samples, 79.95–95.27% for the fruit juice samples, and 84.02–99.62% for the tap water samples. The π–π stacking and hydrophobic interactions between Fe3O4-NH2@MOF-235 and the analytes played an important role in the adsorption process. Moreover, maximum adsorption could be achieved within 5 minutes with very little adsorbent for all the samples. Therefore, the magnetic Fe3O4-NH2@MOF-235 composite combined with MSPE is a convenient approach to detect benzoylurea insecticides in actual samples.
研究领域:
分析化学
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环境科学
·
食品科学
✓ 已验证
产品关联
DOI
高影响因子
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