JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Qingqing Wang,Wei Zhou,Claudia Li,Sibudjing Kawi,Yinhui Li
The application of photocatalysts in environmental field has emerged as a prominent research topic. Nevertheless, the efficiency of photocatalysts is reduced as the recombination of photogenerated chargers significantly, restricting their extensive use in this domain. In the present study, photocatalysts composed of bismuth molybdate/NH 2 -UiO-66(Zr) (Bi 2 MoO 6 /NH 2 -UiO-66(Zr)) featuring Z-scheme heterojunctions were effectively synthesized using a two-step hydrothermal technique. These photocatalysts exhibit remarkable photocatalytic degradation under visible light conditions. Notably, the broad planar configuration of Bi 2 MoO 6 sheets improves the separation of the photogenerated charge carriers. NH 2 -UiO-66(Zr) layered atop Bi 2 MoO 6 sheets enhances the availability of catalytically active sites, reduces charge recombination, and promotes charge transfer through the interface. The kinetic rate constant for Bi 2 MoO 6 /NH 2 -UiO-66(Zr) is around 0.00329 L mg −1 min −1 , indicating the increase of 3.78 and 41.13 times compared with pure Bi 2 MoO 6 and NH 2 -UiO-66(Zr), respectively. The efficiency for photocatalytic degradation of tetracycline using Bi 2 MoO 6 /NH 2 -UiO-66(Zr) reaches 81.72 % under visible light. Importantly, this efficiency exhibits a reduction of 10 % after five recycling cycles, demonstrating notable stability. The photocatalytic mechanism involved in tetracycline degradation was uncovered through trapping experiments and EPR, indicating that it is predominantly facilitated by the active oxidation of ·O 2 - and ·OH. The intermediates of the photocatalytic process as well as the possible degradation pathways were discussed. The creation of Bi 2 MoO 6 sheets/NH 2 -UiO-66(Zr) heterojunction photocatalysts provides a fresh approach to the development of novel catalysts, which may lead to significant advancements in environmental remediation efforts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2021
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IF 2.991
Minjun Ma,Xueke Gao,Zhaohui Guo,Yan Qiao
Biotin–dendrimer conjugates (such as biotin-PAMAMs-NH2) are important macromolecules in the field of host–guest chemistry and widely used systems for delivery. The similar chemical structures of the inner and outer layers of PAMAM-NH2 make it difficult to illuminate the interaction and the binding affinity of biotin-PAMAMs-NH2. By utilizing NMR techniques including 1H NMR titration, CSSF-TOCSY, STDD methods, and 2D DOSY analysis, we demonstrate a method to sort out these interactions. The methylene protons of the inner and outer layers of PAMAM-NH2 are successfully identified and accurately positioned so that the carboxylic acid groups of biotins are having ionic interactions with the outermost amine groups of PAMAM-NH2. The inner PAMAM-NH2 is protonated when reaching the isoelectric point of PAMAM-NH2, increasing the hydrodynamic radius. On the basis of the NMR experiments, a model is proposed, where the carboxylic acid groups and heterocyclic skeleton of biotin arched over the outer layers of PAMAM-NH2 like a bridge. Furthermore, using STDD epitope mapping, the binding affinity between biotin and PAMAM-NH2 was quantified. The diffusion behavior of biotin-G5 PAMAM-NH2 complex is more complicated than that of biotin-G3 PAMAM-NH2 complex due to steric hindrance. The results provide a theoretical basis for understanding these complicated drug delivery systems.
研究领域:
化学
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药物递送系统
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分子相互作用
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DOI
高影响因子
Biosensors-Basel
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2024
·Vol. 14
·期 10
·512
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IF 4.9
Jiawen Fan,Junjie Qi,Jingkun Li,Fuwei Pi
Arginine has been widely applied in the food industry as coloring agents, flavoring agents, and nutritional fortifiers. It is also one of the major components of feed additives. Currently, methods for the highly selective detection of arginine remain absent. For accurate and sensitive detection of L−arginine, a novel ratiometric fluorescence assay based on Ru@UiO-66-NH2was developed and demonstrated in this study. Under optimized detection conditions, the limit of detection (LOD) of this assay for L-arginine was 2.32 μM, which is superior to most assays reported to date. Meanwhile, Ru@UiO-66-NH2showed good stability within 30 days, demonstrating the wide applicability of the proposed assay. The spike-and-recovery rates of the proposed assay for L-arginine in real samples (e.g., tea, grape juice, and serum) were 84.27–113.09%. Overall, the proposed assay showed high sensitivity, good reproducibility, and excellent stability in the detection of L-arginine in both buffer and real samples.
研究领域:
分析化学
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食品科学
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生物化学
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DOI
PubMed
高影响因子
Nanoscale
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2025
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IF 5.1
Zuyao Fu,Lingfeng Yang,Zhaoyang Ding,Jing Xie
Immobilized enzymes play a crucial role in analytical sensing due to their exceptional stability and considerable commercial importance. In this study, a stable Zr-based metal–organic framework (UiO-66-NH2) was prepared as an immobilization platform for horseradish peroxidase (HRP) through covalent binding. HRP@UiO-66-NH2 retained 75% of its activity after 10 cycles. Subsequently, a colorimetric/fluorometric dual-mode sensing strategy using HRP@UiO-66-NH2 was developed for nitrite detection. HRP@UiO-66-NH2 facilitated the transformation of the non-colored compound 3,3′,5,5′-tetramethylbenzidine (TMB) into its blue oxidized form. When nitrite is added, oxidized TMB (ox-TMB) specifically engaged with nitrite (NO2−) to generate diazotized TMB, leading to a color shift from blue to yellow. Concurrently, NO2− reacted with the amino groups of HRP@UiO-66-NH2, forming diazonium compounds and suppressing the fluorescence of HRP@UiO-66-NH2. The limits of detection were 0.21 μM and 0.19 μM for the colorimetric and fluorometric strategies, respectively. Furthermore, a portable kit for detecting nitrite was created by integrating gelatin with HRP@UiO-66-NH2. The kit could visually identify nitrite from 10–400 μM in colorimetric mode and 0–400 μM in fluorometric mode. This method provides an innovative approach for nitrite sensing, paving the way for new research into multifunctional immobilized enzymes and their potential uses in biochemical sensing applications.
研究领域:
生物化学
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分析化学
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DOI
PubMed
高影响因子
Green Energy & Environment
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2020
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IF 6.395
Zhuizhui Su,Bingxing Zhang,Xiuyan Cheng,Fanyu Zhang,Qiang Wan,Lifei Liu,Xiuniang Tan,Dongxing Tan,Lirong Zheng,Jianling Zhang
UiO-66-NH 2 , an important metal–organic framework, is usually synthesized by solvothermal method and the particle size is generally larger than 200 nm, which limits its catalytic applications in chemical reactions. It is very meaningful to produce UiO-66-NH 2 nanoparticles with ultra-small size, but remains challenging. Herein, we synthesized UiO-66-NH 2 nanoparticles in size of 8–15 nm that are immobilized on g-C 3 N 4 nanosheets. Compared with the UiO-66-NH 2 synthesized by the traditional solvothermal method (> 200 nm), the ultra-small UiO-66-NH 2 nanoparticles immobilized on g-C 3 N 4 have more unsaturated coordination positions and increased Lewis acidity. Owing to these combined advantages, the ultra-small UiO-66-NH 2 nanoparticles exhibit greatly improved catalytic activity for Meerwein–Ponndorf–Verley reaction than larger UiO-66-NH 2 particles.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Foods
·
2024
·Vol. 13
·期 17
·2736
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IF 4.7
Shibing Zhang,Yiran Wang,Chunyu Yang,Xi Wang,Siyi Wang,Jiping Yin,Yinan Du,Di Wu,Jiangning Hu,Qi Zhao
In this study, amino-modified micro-mesoporous silica (NH 2 -MMS) with hierarchical pores was prepared by modifying micro-mesoporous silica ZSM-5 with 3-aminopropyltriethoxysilane and used as an adsorbent in solid-phase extraction to analyze free fatty acids (FFAs) in krill oil during storage for an initial time. The Brunner Emmet Teller adsorption experiment and Fourier transform infrared spectroscopy demonstrate that NH 2 -MMS, with a hierarchical pore structure, was successfully synthesized. The adsorption experiments, especially static adsorption, indicate that the absorption ability of the prepared NH 2 -MMS, with a hierarchical pore structure, toward FFAs was better than that of traditional amino-modified mesoporous silica (SBA-15) with a mesoporous structure at all temperature and concentrations. Fairly low limits of detection (0.06–0.15 μg g −1 ), acceptable recoveries (85.16–94.31%), and precision (0.08–5.26%) were attained under ideal circumstances. Moreover, NH 2 -MMS has the advantages of easy preparation and being environmentally friendly. As a result, this method offers an alternative to the current method for determining FFAs in different kinds of oil specimens.
研究领域:
食品科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Jiami Ma,Zhixin Hu,Weihong Guo,Cheng Ni,Pan Li,Bosheng Chen,Songhua Chen,Jinlong Wang,Yanbing Guo
Ground−level ozone (O 3 ) pollution poses a significant threat to both ecosystem sustainability and human health. The catalytic decomposition of O 3 presents as a promising technology to address the issues of O 3 pollution. This study undertook the synthesis of various functionalized metal−organic framework (MOF) catalysts ( i.e., X-MIL-53(Fe) (X = H, NH 2 , NO 3 )) to delve into the influence of ligand functional groups on skeletal structure and catalytic efficacy, particularly focusing on unraveling the mechanism of O 3 catalytic decomposition under humid conditions. NH 2 -MIL-53(Fe) catalyst achieved complete O 3 decomposition under ambient temperature and high humidity conditions (RH=75 %), exhibiting a reaction rates (mol·m −2 ·s −1 ) 129 and 10.5 times greater than that of MIL-53(Fe) and NO 2 -MIL-53(Fe). The NH 2 group promotes electron flow within the backbone towards the hydroxyl group (OH) linked to Fe atom. In humid O 3 , H 2 O molecules augment the interaction between O 3 and NH 2 -MIL-53(Fe), and OH is converted to·O 2 − after deprotonation, promoting O 3 decomposition. Additionally, leveraging three−dimensional (3D) printing technology, a monolithic catalyst for O 3 decomposition was prepared for application. This study not only advances understanding of the mechanisms underlying O 3 decomposition but also offers practical solutions for addressing O 3 pollution at humid conditions.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Catalysis Science & Technology
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2021
·Vol. 11
·期 19
·6507-6515
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IF 6.119
PanPan Xu,Liuxue Zhang,Xu Jia,Hao Wen,Xiulian Wang,Suqing Yang,Juxian Hui
Compared to the current commercial three-step production process involving low phenol yield, low atomic efficiency, and the formation of explosive intermediates, the direct oxidation of aromatic hydrocarbon to more desirable and important chemical industry intermediate such as phenol offers a more attractive and challenging pathway. Here, we report the selective photocatalytic hydroxylation of benzene to phenol using NH2-MIL-88/PMo10V2-3 as the catalyst and H2O2 as a mild oxidant. Heteropoly acid (PMo10V2) was immobilized to metal–organic frameworks (NH2-MIL-88), where PA anions play an essential role in anchoring NH3+ cations to form stable heterogeneous photocatalysts. The reaction offered a high selectivity of 99% with a yield of 24% for phenol under optimum reaction conditions. Comprehensive characterizations and experiments disclosed a multistep reaction mechanism in which high dispersion of PMo10V2, the production of hydroxyl radical(˙OH) and the formation of V5+/V4+ redox pairs are responsible for the activity of the reaction in the presence of electrons (e−). The recycling experiments were essential in confirming the reusability of the catalyst, and FT-IR characterization analysis also proved the integrity of NH2-MIL-88/PMo10V2-3 after three cycles. This work provides potential applications in the green and highly efficient photocatalytic synthesis of other organic compounds and other environmental applications.
研究领域:
化学
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环境科学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2021
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IF 3.764
Ju Liu,Dandan Hao,Huiwen Sun,Yu Li,Jianlin Han,Bo Fu,Jiancheng Zhou
In this Article, a hybrid foam was fabricated through the integration of amine-functionalized Fe-MOF (MIL-101-NH2) into cellulosic matrix. The existence of enormous group linkages and ionic bonding interactions among the composite foam network leads to a uniform dispersion of MIL-101-NH2 and high affinity between the MOF and cellulose skeleton. As-prepared hybrid foams were utilized as photocatalysts to reduce toxic hexavalent chromium ions (Cr(VI)) under visible light. Optimal performance was observed over CM-1 (with a MIL-101-NH2 and nanocellulose mass ratio of 1:1). When compared to pure MOF nanoparticle counterparts, the CM-1 foam presented preferable and more efficient Cr(VI) removal performance. The reasons could be attributed to the hierarchal pore structure and uniform MOF loading. Moreover, the flexible foams could be easily separated from the solution and preserved more than 80% removal efficiency of Cr(VI) after 10 runs. This work would shed light on how to construct high-efficiency photocatalysts for environmental governance from sustainable materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ANALYST
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2022
·Vol. 147
·期 24
·5655-5662
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IF 5.227
Ying Zhou,Ruichun Li,Guomei Zhang,Yan Zhang,Caihong Zhang,Shaomin Shuang
Metal–organic frameworks (MOFs) have emerged as interesting nanomaterials owing to their large surface area, high porosity, tunable pore architecture and easy functionalization. However, an inferior electrical conductivity hinders their application in electrochemical sensing. In this paper, gold–palladium alloy/UiO-66-NH2/graphene (AuPd/UiO-66-NH2/GN) composites were synthesized by loading alloys on the surfaces of MOFs and then attaching them to the graphene surface. The addition of metal nanoparticles and graphene enhanced the electron transfer ability of MOFs. Then, composites were used to modify a glassy carbon electrode (GCE) to construct a sensitive dopamine (DA) electrochemical sensor. The developed sensor manifested two linear relationships in lower concentration ranges and in higher concentration ranges with a 0.21 × 10−6 mol L−1 low detection limit (3σ/k) under optimal conditions. The results certified that the constructed sensor had high selectivity, excellent reproducibility and good stability, and had been used successfully for DA detection in actual human serum samples.
研究领域:
材料科学
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分析化学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yongtong Lei,Lijing Zhu,Jilong Xu,Shuan Liu,Zhixiang Zeng,Xiaocheng Li,Gang Wang
Metal organic framework (MOF) with fine pore structures, ultra-high porosity and large specific surface area can provide more water transport channels while achieving precise sieving of different sizes of ions, which is a promising material for high efficiency desalination. However, particle agglomeration, interface incompatibilities and interface defects severely restrict the performance of MOF-based membranes. It is still a challenge to construct MOF-based desalination membranes with both high water permeability and high ion sieving. Herein, the UiO-66-NH 2 based nanofiltration membrane was fabricated by in-situ growth of UiO-66-NH 2 on Nylon membrane and composed with polyamide (PA) layer by interfacial polymerization (IP). With 12 h solvothermal reaction, the UiO-66-NH 2 nanoparticles are found uniformly loaded on the Nylon substrate. Therefore, the water molecule transport channels provided by UiO-66-NH 2 nanoparticles reduce the transport resistance, which can improve the water permeability. More importantly, UiO-66-NH 2 nanoparticles are found to be involved in the IP process, which can reduce the interfacial defects and thus enhance the bonding force between the PA layer and base film. The synergistic effect of the UiO-66-NH 2 and PA layer improves the nanofiltration performance of the membrane with rejection rate of 92.97% for Na 2 SO 4 and the pure water permeance (PWP) of 11.55 L m −2 h −1 bar −1 . The N-UN12 @PA membrane also has excellent antifouling performance (flux recovery ratio (FRR) of 95.86%, reversible fouling ratio (Rr) of 33.93%, irreversible fouling ratio (Rir) of 4.14%). Unlike the mixed-matrix membrane (MMM) and polycrystalline MOF membrane, this strategy provides a promising method to prepare high-performance nanofiltration membrane for desalination.
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
Energy Technology
·
2025
·
IF 3.6
Ming Yan,Haoyu Chen,Yu Zhu,Yuxiao Deng,Zhuanlong Yan,Ziyi Lu,Yanlin Chen
In this study, NH 2 –SiO 2 @Ti 3 C 2 T x core–shell microspheres with different Ti 3 C 2 T x contents are prepared by coating Ti 3 C 2 T x nanosheets on the surfaces of SiO 2 microspheres using an electrostatic self-assembly method. The structures, elemental compositions, and microscopic morphologies of NH 2 –SiO 2 @Ti 3 C 2 T x microspheres are investigated by X-Ray diffraction, Fourier-transform infrared spectroscopy, field-emission scanning electron microscopy, and X-Ray photoelectron spectroscopy. The results show that Ti 3 C 2 T x nanosheets are uniformly coated on the surfaces of the SiO 2 microspheres, and the surfaces of the SiO 2 microspheres are modified by NH 2 . The maximum specific surface area of NH 2 –SiO 2 @Ti 3 C 2 T x composite doped with 15 wt% Ti 3 C 2 T x is 29.937 m 2 g −1 , with an average pore size of 0.11848 cm 3 g −1 . The electrochemical performance test results show that after 100 cycles at a C rate of 0.2C, the specific capacity of the NH 2 –SiO 2 @Ti 3 C 2 T x anode material increases by 270.1% compared to that of SiO 2 , reaching 142.5 mAh g −1 . Compared with SiO 2 , the NH 2 –SiO 2 @Ti 3 C 2 T x materials have higher electrical conductivities and Li ion diffusion rates, thereby improving their rate performances, and the discharge specific capacities and cycling stability are superior to those of the SiO 2 anode material.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）