ACS Applied Nano Materials
·
2024
·
IF 5.3
Shouyu Ren,Qian Chen,Yuxin Jin,Xiaohui Liang,Cao Wu,Yu Zhang,Zengming Man,Zhou Chen
Diverse phases of Fe2O3 manifest distinct physical and chemical attributes. Herein, Fe2O3 and Fe2O3@C dodecahedrons with the yolk-shell structure were prepared by controllable pyrolysis of MIL-88 MOFs with different processes. The corresponding pyrolytic stages in air were proposed, followed closely via a similar self-oxidation/reduction procedure in the N2 atmosphere. In terms of microwave absorption performance, the hollow α-Fe2O3@C nanocomposites with the yolk-shell structure could facilitate the dielectric loss, and the interfaces between α-Fe2O3 and C promote the dissipation of an electromagnetic wave, which improve electromagnetic attenuation capability and enrich the loss mechanism of Fe2O3 collaboratively. Due to its carbon-coated hollow structure, αγ-Fe2O3@C nanocomposites calcinated at 400 °C exhibit the best ability for electromagnetic energy conversion. The device has a matching thickness of 2.25 mm, an effective absorption bandwidth of 11.2 to 15.64 GHz, and a total width of 4.44 GHz. Its highest reflection loss (RL) is −52 dB at 8.6 GHz (X band). In the range of −80 < θ < 80, the maximum radar cross section (RCS) reduction of α-Fe2O3@C is greater than 20 dB m2. A great deal of attention has been paid to theoretical simulations of RCS because of its reasonable composition and low-cost features. This work breaks ground for fabricating a MIL-88-derived electromagnetic wave absorber via the enlightenment of RCS simulations.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 113
·112502-112511
·
IF 3.289
Jiumei Wang,Jinquan Wan,Yongwen Ma,Yan Wang,Mengjie Pu,Zeyu Guan
MIL-88A was synthesized in diverse preparation conditions and characterized by various techniques. The catalytic performance of MIL-88A series for degrading Orange gelb (OG) through persulfate activation were also tested at temperature of 25 °C and the results were shown in the following sequence: 85 °C/2 h > 65 °C/2 h > 105 °C/2 h > 65 °C/6 h > 65 °C/12 h. MIL-88A produced at the synthesis temperature of 85 °C and in the crystallization time of 2 h (85 °C/2 h) was the best one with a removal rate of 96.4% mainly due to high SBET and much greater leach-out of Fe. An optimal dosage (0.3 g L−1) for MIL-88A in the MIL-88A/PS/OG system exists because of inhibition and promotion by fumaric acid. The filtrate experiment indicated that the catalytic activation involved heterogeneous reactions on the surface of the catalyst and homogeneous reactions in solutions. But the heterogeneous reaction occupied the principal position and the probable mechanism was obtained. Moreover, only solution pH < 4 could show a high degradation effect without the help of temperature. Comparing two different methods in the recycling experiment, the removal rate of OG decreased after the fourth run in both. Loss of active catalytic sites for Fe(III) in MIL-88A in the process of separating and sampling was responsible for activity decay.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Qun Ding,Xuejun Zou,Jun Ke,Yuying Dong,Yubo Cui,Hongchao Ma
Herein, a ternary TiO 2 /MIL-88A(Fe)/g-C 3 N 4 heterojunction is successfully constructed through a facile hydrothermal strategy for enhancing solar energy harvesting and efficiency of catalytic nitrogen reduction induced by enlarged light absorption range, increasing interfacial charge transfer ability and desirable stability. Under the simulated sunlight irradiation, the N 2 fixation experiment shows that the yield of NH 3 reaches 1084.31 μmol/(g·h) over the TiO 2 /MIL-88A(Fe)/g-C 3 N 4 photocatalyst, and the yield is significantly enhanced, which is 33.68 and 13.94 times that is higher than the pure TiO 2 and g-C 3 N 4 , respectively. In a mean time, the excellent performance of the photocatalytic N 2 fixation over the ternary TiO 2 /MIL-88A(Fe)/g-C 3 N 4 is verified based on density function theory calculation and the decisive step over the composite is investigated by calculating Gibbs free energies of nitrogen reduction paths. The performance enhancement mechanism of TiO 2 /MIL-88A(Fe)/g-C 3 N 4 is speculated, which indicates that the hybridized three-component system presents a desirable Z-scheme band alignment, resulting in the improvement of separation and transfer efficiency of photoinduced charge carriers. The article shows a new and high-efficiency TiO 2 /MIL-88A(Fe)/g-C 3 N 4 photocatalysis for excellent nitrogen reduction ability.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Muhammad Rahim,Zhiqiang Zou,Zhuoyang Du,Lingmei Dai,Dehua Liu,Wei Du
Macroporous metal–organic frameworks (MOFs) exhibit immense promise as carriers for immobilizing macromolecules, notably lipases. Nevertheless, their minute particle dimensions pose challenges in the recycling process, thereby significantly constraining their widespread practical utilization. To address this limitation, this study explores the potential of incorporating magnetic substances during the carbonization process, especially focusing on the use of magnetically carbonized Macro-MIL-88A for lipase immobilization and biodiesel production. The effects of different carbonation temperatures on macroporous MIL-88A and microporous MIL-88A were investigated. Our findings revealed that the carbonization temperature influenced the preservation of the 3D structure and the generation of magnetite. Carbonized Macro-MIL-88A (Macro-Fe3O4-C) at 500 °C exhibited superior specific activity and enhanced activity recovery. Lipase immobilized on Macro-Fe3O4-C (Macro-Fe3O4-C-TLL) demonstrated higher methanol tolerance during the biodiesel production process compared to Micro-Fe3O4-C. The reduced reusability of Macro-Fe3O4-C-TLL was attributed to the adsorption of the by-product glycerol. We further investigated pre- and posthydrophobic modifications on Macro-Fe3O4-C and found that post-PDMS modification maintained both high enzyme loading and good reusability of the immobilized lipase during biodiesel production. This study presents a promising method to enhance the reusability of immobilized large molecules by incorporating magnetite via a straightforward carbonization process.
研究领域:
生物化学
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材料科学
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化学工程
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生物技术
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 9
·3792-3798
·
IF 3.806
Wen-Tao Xu,Lin Ma,Fei Ke,Fu-Min Peng,Geng-Sheng Xu,Yu-Hua Shen,Jun-Fa Zhu,Ling-Guang Qiu,Yu-Peng Yuan
Metal–organic frameworks (MOFs) MIL-88A hexagonal microrods as a new photocatalyst show an active performance for methylene blue (MB) dye decolorization using visible light. MB decolorization over the MIL-88A photocatalyst follows first-order kinetics. The addition of a H2O2 electron acceptor can markedly enhance the photocatalytic MB decoloration performance of MIL-88A. Moreover, MIL-88A showed a very stable activity for MB decoloration after four consecutive usages. Owing to the advantages of the visible light response, low cost and abundance in nature, this active MIL-88A MOF photocatalyst would have great potential for environmental purification.
研究领域:
材料化学
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环境科学
·
光催化
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纳米材料
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污染治理
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物理化学
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绿色化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenfei Yang,Xinnian Xia,Luhua Shao,Longlu wang,Yutang Liu
Herein, Ag 3 PO 4 /mixed-valence MIL-88A(Fe) [AMM] Z-scheme heterojunctions with an in-situ-generated photo–Fenton process were successfully constructed. The optimized AMM-20 heterojunctions show the maximum rate of photocatalytic TC degradation, which is 2.5 and 6.6 times of pristine Ag 3 PO 4 and MIL-88A(Fe). The electronic and band structures of Ag 3 PO 4 , MIL-88A(Fe), m-MIL-88A(Fe) and AMM heterojunctions were deeply investigated by both experimental and theoretical simulation. The Z-scheme transfer pathway greatly accelerates the transfer rate of charge carriers and effectively inhibits the photocorrosion, leading to the improvement of photocatalytic activity and photostability. Moreover, the adjustment of the Fe II /Fe III ratio of mixed-valence MIL-88A(Fe) further enhances the photocatalytic activity of the hybrid photocatalysts, benefiting from the promotion of the efficiency of the in-situ-generated photo-Fenton process. The Z-scheme transfer route coupling with an in-situ-generated photo–Fenton process was verified by the free radical trapping experiment, in-situ XPS measurement, in-situ ESR measurement, and coumarin fluorescence analysis. The degradation pathways of TC were determined through LC-MS analysis and theoretical calculation. Furthermore, the toxicity of intermediates was evaluated by QSAR prediction.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Xueying Yang,Jian Zhang,Ming Xu,Xiangdong Zhang,Junlian Ren,Haina Bai
The advanced oxidation technology of persulfate has great potential in removing pollutants. Appropriate bimetallic activation method has obvious synergistic effect on the formation of free radicals and non-free radicals, and can also promote the electron transfer process. Therefore, in this paper, Ni was doped on the iron-based metal organic framework (MIL-88A) to form bimetallic catalyst and used as persulfate activator for oxytetracycline (OTC) degradation. The introduction of Ni increased the specific surface area of the catalyst and significantly improved its catalytic performance. Within 30 min, the degradation efficiency of 5 mg/L OTC reached 81.30%. The used catalyst can be simply recovered by standing, and the catalytic stability is high. The composition of main reactive oxygen species (ROS) in pollutant decomposition was clarified through the analysis of degradation mechanism. In addition to typical •OH、SO 4 •− and O 2 •− , non-free radical 1 O 2 was also generated. Based on LC-MS detection and toxicological experiments, the possible degradation pathways were proposed and the toxicity was analyzed. This material provides a new insight for activating PS to remove refractory organic compounds, and promotes the application of Fe-MOF materials in environmental pollution remediation.
研究领域:
环境科学
·
污染治理
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ranran Yuan,Jinli Qiu,Cailiang Yue,Chen Shen,Dawei Li,Changqing Zhu,Fuqiang Liu,Aimin Li
Hierarchical MIL-88A(Fe)@ZnIn 2 S 4 heterostructures were synthesized via a facile low-temperature solvothermal method. The combination of MIL-88A(Fe) and ZnIn 2 S 4 produced excellent photocatalytic properties under sunlight irradiation. The enhanced separation efficiency of the photogenerated charge carriers facilitated the optimal photocatalytic performances of 12.5%-HMIL@ZIS, with 100% the of hexavalent chromium (Cr(VI)) and 99.6% of the sulfamethoxazole being converted within 9 min and 60 min at pH 5, respectively. The kinetic rate constants of Cr(VI) reduction (0.5864 min −1 ) and sulfamethoxazole (SMZ) degradation (0.0958 min −1 ) were approximately 15 and 5 times larger than those previously reported. The formation of ·O 2 − could promote the super-high conversion of Cr(VI). Meanwhile, the synergetic effect of 1 O 2 and ·O 2 − played a dominant role in the degradation of sulfamethoxazole. Furthermore, the satisfactory photocatalytic performances could be maintained after four cycles. This work provides new insights into the design of metal-organic framework based photocatalysts and indicates the great potential for efficient purification of actual wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2022
·
IF 1.193
Yan-Yan XING,Mei-Ling CHEN,Xin-Ai SHEN,Ning LIANG,Xiao-Hong HOU
In consideration of the promising application of peroxidase (POD)-like nanozymes in biomedical analysis, the development of POD mimics with good catalytic performance under neutral conditions remains significant. As a new catalyst, metal-organic frameworks have been explored as candidate nanozymes owing to their high catalytic activity, good stability, flexible and simple synthesis methods, diverse types, and properties. Herein, rod-like Fe-MIL-88A was successfully synthesized via a simple hydrothermal method. Fe-MIL-88A exhibited POD-like properties under neutral conditions and a stronger affinity for substrate 3,3 ' ,5,5 ' -tetramethylbenzidine and H 2 O 2 than natural horseradish POD. This result was primarily due to the additional exposed (100) facets of rod-like Fe-MIL-88A, which can catalyze the decomposition of H 2 O 2 to •OH more easily. Based on the POD-like properties of Fe-MIL-88A under neutral conditions, combined with glucose oxidase, a one-pot colorimetric analysis method for glucose detection was established. The proposed measurement had a linear range of 1–100 µM and a limit of detection of 0.45 µM. The colorimetric method was accurate, reliable, highly selective, convenient, and time-saving. Furthermore, the one-pot method was successfully applied to detect the concentration of glucose in human blood samples, and the measured results were consistent with those of commercial glucose meters, indicating that the proposed method can be a potential candidate for glucose detection.
研究领域:
生物化学
·
纳米技术
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Huayu Wang,Yanhua Cao,Changsheng Guo,Ming Ge
Heterogeneous catalyst/persulfate advanced oxidation process has been widely used in antibiotic wastewater treatment . As-designed MIL-88A(Fe)/g-C 3 N 4 composite catalyst firstly activated peroxydisulfate (PDS) to degrade tetracycline (TC) in this work. Activating PDS by MIL-88A(Fe)/g-C 3 N 4 has a higher efficiency and rate toward TC degradation compared with MIL-88A(Fe) and g-C 3 N 4 . After 60 min, the optimal MIL-88A(Fe)/g-C 3 N 4 -5 activated PDS to degrade about 80% of TC in water. The existence of g-C 3 N 4 increases the specific surface area and active Fe 2+ content of MIL-88(Fe), promotes PDS adsorption and utilization, thus showing an excellent catalytic performance for PDS activation. MIL-88A(Fe)/g-C 3 N 4 activated PDS oxidation process synergistically removed TC by free radicals (O 2 •− , •OH and SO 4 •− ) with non-free radicals ( 1 O 2 ), and the effect of some important operating factors on TC removal, the TC degradation pathways and toxicity of TC intermediates were analyzed. Moreover, the MIL-88A(Fe)/g-C 3 N 4 -5 powdered catalyst was designed into a catalytic membrane, which could remove 96% of TC in a short time (<10 min). The cycle tests confirm that powdered MIL-88A(Fe)/g-C 3 N 4 composite catalyst and its catalytic membrane have a good recyclability and stability, demonstrating that this catalyst possesses a practical application potential in the treatment of TC polluted wastewater.
研究领域:
环境科学
·
催化材料
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Hao Du,Rubin Huo,Aoxiang Liu,Yuxin Hui,Bo Shen,Ningyi Li,Yun Ji,Qin Jin,Baobing Zheng,Guoxiang Yang,Zhe Zhang,Qi Wang
Herein, a photo-self-Fenton system of resorcinol-formaldehyde resins/MIL-88A(Fe) (RF/88A) S-scheme heterojunction was successfully established to in-situ generate and activate H 2 O 2 toward tetracycline (TC) degradation and sterilization under visible light illumination. As a result, the 35 %-RF/88A (the mass ratio of RF to 88A was 35 %) can remove most TC and kill approximately 100 % E. coli and S. aureus . Notably, the composites presented superior repeatability and wide pH application range. Fukui index identified the reaction sites of TC molecule and quantitative structure-activity relationship (QSAR) forecasted intermediates toxicity. Density functional theory (DFT) calculations were performed to investigate electron transfer mechanism of the heterojunctions on a molecular scale. Such a S-scheme charge transfer route was also proved by in situ irradiated X-ray photoelectron and electron paramagnetic resonance measurements. In summary, this research innovatively provides deep insights into the in-situ generation and activation of H 2 O 2 and exhibited an environmentally friendly way toward pollutant degradation and sterilization.
研究领域:
环境科学
·
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hao Huang,Fatima-ezzahra Ettoumi,Li Li,Yanqun Xu,Zisheng Luo
Economic value of the global potato harvest is impacted by sprouting during storage. We examined how sprouting might be reduced or eliminated using citral , a naturally occurring component in citrus fruit peel. The current study integrated both loading and sustained release of citral using emulsification-based interfacial synthesis of hollow MIL-88A. The structural properties and compositions of MIL-88A and hollow MIL-88A were confirmed using SEM, EDS, and XRD. BET analysis showed a surface area of 30.36 m 2 g −1 , pore volume of 0.21 cm 3 g −1 , and an average pore radius of 13.56 nm for hollow MIL-88A. Citral was successfully loaded into 10 g of MIL-88A and hollow MIL-88A, with a total citral load of 0.21 cm 3 and 1.82 cm 3 , respectively. The citral-loaded hollow MIL-88A induced a sustained release of citral, which effectively inhibited the sprouting, leading to higher starch content by 41%, lower weight losses, reducing sugar content, α-Amylase, β-amylase, and starch phosphorylase activities by 75%, 55%, 34%, 31%, and 43%, respectively. The citral-loaded hollow MIL-88A might inhibit sprouting by suppressing gibberellin and indole-3-acetic acid while maintaining abscisic acid.
研究领域:
农业科学
·
食品科学
·
材料科学
·
植物生理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）