SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Junchi Wang,Hui Li,Ndzondelelo Bingwa,Hao Yu,Guoning Li,Qiangqiang Xiao,Shijie Li,Min Guo,Xiaoling Ma
In this study, UiO-66(Zr) and its derivative (UiO-66-C) are employed as supports to prepare shape stabilized PCM (U/SA-X and UC /SA-X) for resolving the melting leakage and poor thermal conductivity of stearic acid (SA). Thermal storage performance, including phase change enthalpy, supercooling degree, phase change temperature, thermal conductivity, and shape stability of U/SA-X and UC/SA-X, are compared. Preliminary characterization reveals that the physicochemical property evolution of the support impacts the thermal storage performance of SA . UiO-66 with microporous structure is unfavorable to enhance the shape stability of SA. U/SA-X exhibits low thermal storage efficiency and high supercooling degree owing to nanoconfinement and hydrogen bonding. By contrast, UiO-66-C possesses mesopores and graphitic structure that allows for a remarkable thermal storage performance of UC/SA-X. In detail, UC/SA-50 exhibits an ideal thermal storage performance, where the thermal conductivity (0.531 W/(m·K)) increases by 141 % in comparison to SA with a high phase change enthalpy of 93.6 J/g and low supercooling degree of 0.24 °C. It also shows satisfying thermal reliability that the thermal property of UC/SA-50 maintains stability even after 100 thermal cycles. In addition, the photothermal conversion efficiency of UC/SA-50 is up to 83.06 %.
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APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Zhiwang Yang,Xueqing Xu,Xixi Liang,Cheng Lei,Lihong Gao,Ruoxue Hao,Dedai Lu,Ziqiang Lei
This study investigates the photocatalytic reduction of nitroaromatic compounds upon visible light over novel Ce-doped UiO-66/graphene nanocomposites. Ce doped UiO-66 nanostructures and the corresponding graphene hybridized nanocomposites were facilely synthesized by means of one step solvothermal reaction. It has been demonstrated that produced nanocomposites could be used as highly efficient and chemical stable photocatalysts for the reduction of nitroaromatic compounds under visible irradiation and ambient conditions. Compared with the bare UiO-66, Ce-UiO-66/GR distinctly enhanced photocatalytic activity. Ce as “ mediator ” introduced into the MOFs materials can greatly improve the electron transfer across the interface between grephene and the UiO-66 and further improve the visible light driven photoactivity. This is an effective strategy for the development of high photocatalytic activity MOFs based materials.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 12
·6779
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IF 4.9
Ming-Qin He,Xin-Yu Chang,Hong-Wei Li,Yuqing Wu
The oxidative esterification of aldehydes under mild conditions remains a significant challenge. This study introduces a unique defective UiO-66 to achieve gold nanoclusters (AuNCs) for efficient aldehyde oxidation under mild conditions. The construction and characterization of these materials are thoroughly investigated by techniques of XRD, SEM and TEM images, FT-IR, Raman, and XPS spectrum, emphasizing the unique microporous in defective UiO-66 are conducive to the fabrication of AuNCs. The catalytic performance of the prepared materials in aldehyde oxidation reactions is systematically evaluated, demonstrating the remarkable efficiency of dispersed Au@UiO-66-25 with high-content (9.09 wt%) Au-loading and ultra-small size (~2.7 nm). Moreover, mechanistic insights into the catalytic process under mild conditions (70 °C for 1 h) are provided, elucidating the determination of defective UiO-66 in the confined fabrication of AuNCs and subsequent furfural adsorption, which underlie the principles governing the observed enhancements. This study establishes the groundwork for the synthesis of highly dispersed and catalytically active metal nanoparticles using defective MOFs as a platform, advancing the catalytic esterification reaction of furfural to the next level.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 22
·10093-10103
·
IF 2.7
Chunpei Yan,Qihang Peng,Linshan Peng,Zhirong Liu,Yong Qian,Tianxiang Jin
This study introduces UiO-66-PO3, a novel functionalized metal–organic framework (MOF) tailored for efficient thorium separation and enrichment from wastewater. UiO-66-PO3 was synthesized by amination reaction between UiO-66-NH2 and 2-carboxyethylphosphonic acid. Comprehensive characterization techniques confirmed its successful synthesis and revealed its unique properties. UiO-66-PO3 exhibited a remarkable theoretical maximum adsorption capacity of 320.0 mg g−1 for Th(IV) under optimized conditions. Its exceptional hydrophilicity significantly enhanced the adsorption capacity compared to UiO-66-NH2. Furthermore, UiO-66-PO3 retained over 89% of its initial adsorption capacity for Th(IV) after five adsorption–desorption cycles, highlighting excellent regeneration capabilities. UiO-66-PO3 emerges as a promising adsorbent for thorium separation due to its high adsorption capacity, regeneration performance, and tunable properties.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Ruyi Cui,Yong Zhou,Xingyi Xu,Hengxin Fang,Wenlong Wang,Sanmei Wang,Pengbo Lyu,Lizhong Sun,Biao Wang,Changqing Sun
Ammonia borane (AB) is a highly promising hydrogen carrier with significant potential for safe and efficient hydrogen storage and transportation. However, its high chemical stability poses considerable challenges for hydrogen release, emphasizing the importance of highly efficient catalysts. In this study, we present Ru nanocatalysts supported on UiO-66-NH 2 -derived carbon nitride (Ru/CN) as high-performance catalysts for AB hydrolysis. A facile pyrolysis-impregnation method was employed to synthesize highly dispersed Ru nanoparticles with tunable sizes, while retaining the octahedral morphology of the MOF-derived support. Detailed characterizations revealed tunable Ru nanoparticle sizes achieved by simply adjusting the Ru loading. Among the catalysts, the 2.5Ru/CN, featuring Ru nanoparticles with an average size of 2.2 nm, achieved an impressive turnover frequency of 493 mol H 2 (mol Ru −1 ·min −1 ) at 30 °C, demonstrating exceptional catalytic activity. Density functional theory (DFT) calculations confirmed that the optimized Ru cluster size enhances key catalytic steps, including H 2 O dissociation, AB activation, and H 2 desorption. This study highlights the critical role of fine-tuning nanoparticle sizes and provides valuable insights into the rational design of advanced catalysts for more efficient hydrogen production.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
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IF 6.9
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Fan Wang,Yueying Zheng,Zeyu Guo,Gang Yang,Mengxia Xu,Tao Wu
Metal-organic frameworks (MOFs) is a promising material that can be used in many fields, including environmental remediation. In this work, a novel adsorbent was successfully prepared by doping the Co element into the framework of UiO-66 with an in-situ oil bath synthesis. This modification ensured that the materials retained relatively good crystallinity. The Co-doping process had a major impact on the particle size and morphology of the original MOFs. The CoUiO-2 exhibited larger surface area and pore size than pristine UiO-66. Accordingly, the maximum adsorption amount of malachite green (MG) on CoUiO-2 (628.93 mg/g) was significantly larger compared with UiO-66 (343.64 mg/g), which was due to more active adsorption sites. In addition, the CoUiO-2 also showed a superior adsorption capacity on rhodamine B (RhB) (1106.22 mg/g). The adsorption process was well described by both the pseudo-second order and Langmuir models, indicating it was dominated by chemisorption and the adsorbent had a homogeneous surface area for adsorption. Therefore, the CoUiO-2 material could be a promising adsorbent for wastewater treatment . This work can provide an important insight into the modification of MOF materials and identify further opportunities to promote the adsorption performance in environmental remediation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kaili Gong,Lian Yin,Zilong Wu,Keqing Zhou,William W. Yu
Given the good structural and compositional characteristics, there are considerable trends towards optimizing the architectures of two-dimensional materials to work for high-performance flame-retardant polymeric materials. Herein, considering the promising features of Ti 3 C 2 T x MXene, phytic acid-modified UiO-66 (PA-UIO) was self-assembled onto MXene nanosheets (MXene/PA-UIO) using electrostatic interactions. The resulting nanohybrids presented good interfacial interactions and dispersion in epoxy matrix, opening up the possibility of simultaneously improving the mechanical and flame-retardant properties of the composites. Consequently, epoxy composites with 2 wt% MXene/PA-UIO achieved elevated mechanical properties and enhanced thermal properties, reflected by the increased storage modulus and tensile strength, as well as the declined rate of mass loss (R max , 28.3% reduction rate). Also, the addition of MXene/PA-UIO nanohybrids led to the drops in peak heat release rate (PHRR), peak smoke production rate (PSPR), peak CO production rate (PCOP) and peak CO 2 production rate (PCO 2 P) of 32.0%, 36.5%, 33.8% and 38.6% respectively, compared to those of pure epoxy. Meanwhile, a smoke factor (SF) with 47% drop rate was obtained, accompanied by significantly decreased gas-phase products, verifying the superior heat-reducing, smoke-suppressing and toxic fume-attenuating effects of the nanohybrids. The synergistic effects between MXene and PA-UIO realized the “3-in-1” fire-safety epoxy nanocomposites in mechanical properties, flame retardancy and smoke/toxic fume-suppressing effects. The performance enhancement was mainly attributed to the dehydration charring of phosphorus-containing acid, catalytic charring of transition metal derivatives, quenching effects of phosphorus radicals and dilution of non-flammable gases, as well as the barrier effects of the nanosheets.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mengyao Mu,Shiping Zhu,Yanmei Gao,Ning Zhang,Youmei Wang,Minghua Lu
The sensitive detection of polychlorinated biphenyls (PCBs) is crucial for protecting the environment and human health. Herein, we constructed a Materials Institute Lavoisier 88B (MIL-88B)-on-University of Oslo 66 (UiO-66) composite (MIL-on-UiO) with a unique nanoflower morphology, in which highly stable UiO-66 is the precursor, with MIL-88B grown on its surface. MIL-on-UiO was used as a fiber coating for headspace solid-phase microextraction to enrich PCBs. Experimental results demonstrated that MIL-on-UiO provided better enrichment performance for PCBs than single components due to multiple interactions, including π–π stacking, halogen bonding, pore-filling, and steric hindrance effects. The method established using the MIL-on-UiO-based SPME fiber coating provided a good linear relationship in the range of 0.001–50 ng·mL −1 , with limits of detection ranging from 0.0002 to 0.002 ng·mL −1 and enrichment factors between 3530 and 7420. In addition, the method was used to detect trace PCBs in water and orange juice achieving satisfactory recoveries (81%–111%).
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 2
·1-11
·
IF 5.3
Sun Xueqin,Fan Yan,Zhang Wenyuan,Yang Xiaogang,Liu Jiacheng
A pentafluoropropionic acid–functionalized fluorescent metal–organic framework material (UiO-66-NH 2 -PFPA) is prepared by a simple post-synthetic modification (PSM) strategy for the sensitive and selective detection of dichloran (DCN). The results of fluorescence experiments demonstrate that the sensitivity of UiO-66-NH 2 -PFPA (limit of detection, LOD = 0.478 μM) to DCN is nearly 10.93 times higher than that of UiO-66-NH 2 (LOD = 5.225 μM) and the material has good selectivity and anti-interference ability. After the addition of DCN, the blue fluorescence of UiO-66-NH 2 -PFPA is obviously quenched. Therefore, the possible quenching mechanism is further discussed in combination with relevant experiments and density functional theory calculations. Moreover, the sensor is applied to the detection of DCN in fruit samples with a satisfactory recovery of 101.1—107.9%, which implies that UiO-66-NH 2 -PFPA is expected to be a candidate material for the detection of DCN in food. Graphical abstract
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaoyu Du,Gan Wu,Xilin Dou,Zhaoyang Ding,Jing Xie
Food prone to spoilage has a huge food safety hazard, threatening people’s health, so early detection of food spoilage is a continuous and urgent need. Herein, we developed a dual-mode response sensor, alizarin complexone@UiO-66-NH 2 , which can accurately detect pH. The sensor demonstrated significant changes in color from pale yellow to deep pink, while the fluorescence shifted from light blue to blue violet. Moreover, both UV absorption and fluorescence intensity showed a linear correlation with pH raging from 4.5 to 7.5. These results indicate that the sensor effectively responds to pH, making it suitable for detecting the freshness of perishable food. To put this into practice, we integrated the sensor with cellulose-based filter paper to determine the freshness of shrimp and beef, which was proved to be effective in assessing freshness. In the future, it can be combined with intelligent colorimetric and fluorescence instruments to achieve visual detection.
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Materials Today Chemistry
·
2025
·
IF 6.7
Le Huy Thai,Le Thi Thanh Nhi,Nguyen Minh Hiep,Dinh Thanh Khan,Trinh Ngoc Dat,Le Vu Truong Son,Le Hoang Sinh
A new all-in-one electrochromic device was demonstrated by employing photocurable methacrylated viologen and polyaniline/UiO-66/NiO/ZnO composite (PUNZ). Methacrylated viologen was dissolved in a photocurable deep eutectic solvent to make electrochromic eutectogel. PUNZ film was electrophoresed on ITO glass and was used as an electrode. UiO-66 can play as an electron donor combined with viologen moieties as electron acceptors to form an electron acceptor-donor complex. ZnO nanoflowers provide fast electron transfer leading to fast switching of the ECD. PANI and NiO can play as ion storage materials, which reduces ion trapping. The ECD with the use of PUNZ film can enhance coloration efficiency, lowering internal resistance, and increase ion conductivity. PUNZ120@ITO-based ECD exhibited a bleaching time 213 times faster than that of the device without using PUNZ film. The optical modulation of PUNZ120@ITO-based ECD maintains up to 95 % after 50 cycles, whereas that of the device without PUNZ film is 46 %.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Xudong Wu,Kaifu Yu,Yizhou He,Xin Cao,Tao Chen,Wenkun Zhu
The phenomenon of rapid migration of photogenerated charges in natural photosynthetic systems has motivated the design of efficient photocatalysts capable of fast charge separation and efficient reaction kinetics for photocatalytically assisted enrichment and separation of uranium U(VI) in uranium wastewater. In this study, we developed a biomimetic photocatalytic system MnOx/NH2-UiO-66-rGO (M/UiO-rGO) with spatially separated dual cocatalysts. Among them, rGO functions to capture electrons and participates in reduction reactions, while MnOx captures holes and participates in oxidation reactions. The M/UiO-rGO catalyst exhibits excellent performance in photocatalytic reduction of uranium (reaching 91.8% in 1 h), and even under natural light conditions, it exhibits excellent uranium removal ability (80.4%). Using multispectral coupling technology, we further confirmed that enriched uranium undergoes a continuous and complex reaction process of “capture-reduction-free radical oxidation–nucleation–crystallization”. This work presents a viable strategy for designing biomimetic photocatalysts with efficient charge separation and rapid reaction kinetics for environmental purification purposes.
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