CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Hui Qiu,Meichen Ye,Qingqing Zeng,Wenlu Li,John Fortner,LeLe Liu,Luyang Yang
Efficient removal of phosphate by agricultural waste derived materials from wastewater is an effective and economic way to prevent eutrophication and water bloom. In this work, we proposed a novel method to immobilize a water stable metal organic framework UiO-66 nanoparticle within modified wheat straw through in-situ hydrothermal synthesis and obtained the new UiO-66 nanocomposites. As indicated by SEM and BET analyses, UiO-66 is uniformly dispersed on the surface and the inner pores of modified wheat straws. The utilization rate of active sites is significantly promoted after UiO-66 impregnation within positively charged wheat straw (St + @UiO-66) which is more beneficial for UiO-66 dispersion. The saturated adsorption capacity of hybrid St + @UiO-66 is shown to be more than 2 times greater than bulky one under high ionic strength. Compared to commercial anion exchanger D201, St + @UiO-66 exhibits excellent selectivity and preference toward phosphate. The adsorption process is highly pH-dependent and adsorption kinetics data fitted well with the pseudo-second-order model. FTIR and XPS study indicated that hydroxyl groups on the surface of UiO-66 were replaced by phosphate ions and the inner-sphere complexation was formed via establishing Zr–O–P coordination bonds. In addition, St + @UiO-66 could be sustainably employed for phosphate removal through the combination of periodic regeneration and complete regeneration. It is demonstrated that St + @UiO-66 has preferable adsorption of phosphate with improved utilization of active sites, implying great potential as a promising phosphate adsorbent.
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DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 33
·11705-11712
·
IF 4.099
Cong-Cong Shen,Ya-Nan Liu,Xin Wang,Xiao-Xiang Fang,Zhi-Wei Zhao,Nan Jiang,Liu-Bo Ma,Xiao Zhou,Tuck-Yun Cheang,An-Wu Xu
Metal–organic framework (MOF)-based materials possess numerous attractive characteristics; however, the application of MOF-based photocatalysts in the area of visible-light photocatalytic H2 evolution is still in its infancy. Herein, we develop a series of novel UiO-66-NH2-based composites with embedded NiO nanoparticles via solvothermal treatment and subsequent calcination. Their characterizations demonstrate intimate lattice-level contacts between UiO-66-NH2 photocatalysts and NiO nanoparticles. By optimizing each component, even without noble metal loading, the U6N-NiO-2 sample (the weight ratio of NiO to U6N-NiO-2 is theoretically calculated to be ca. 10 wt%) with 15 mg eosin Y as a sensitizer causes an enhanced H2 generation rate of 2561.32 μmol h−1 g−1 under visible-light irradiation using TEOA as a sacrificial reagent; furthermore, its corresponding quantum efficiency is as high as 6.4% at 420 nm. The H2 evolution activity of U6N-NiO-2 is about 5 times higher than that of the UiO-66-NH2 photocatalyst (denoted as U6N) and 23 times higher than that of U6N-NiO-2 without sensitizer. It is demonstrated that the high efficiency originates from the visible-light generated electrons of eosin Y and UiO-66-NH2, the efficient separation of carriers by the cascaded band structure and more negative CB of NiO as well as the good dispersion of NiO nanoparticles on the octahedral skeleton. This study provides new insights for the design of MOF-based materials without noble metal loading for visible-light photocatalytic H2 evolution.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Ming-Qin He,Hong-Wei Li,Yuqing Wu
Nitrite is a commonly used food preservative and a water contaminant that has garnered significant attention due to its harmful effects on human health. Developing a simple and sensitive method for determining nitrite levels is crucial for safeguarding public health. In this paper, we present a novel ratiometric fluorescent nanosensor (CDs@UiO-66-NH 2 ), created by combining orange-red-emitting CDs with blue-emitting UiO-66-NH 2 . This ratiometric probe detects nitrite ions (NO 2 − ) based on the diazotization reaction between the amino group in UiO-66-NH 2 and the target NO 2 − , where the blue emission of UiO-66-NH 2 is quenched but the orange-red emission of CDs remains stable. The probe demonstrated a detection range of 0.5–20 μM with a limit of detection (LOD) of 0.157 μM for NO 2 − . Due to the probe’s distinct color changes in response to NO 2 − , RGB values can be easily read using a smartphone, enabling ultrasensitive visual detection of NO 2 − with an LOD of 0.76 μM. This sensor was successfully applied to detect NO 2 − in environmental water samples. Finally, a smartphone-based RGB reading method using CDs@UiO-66-NH 2 for visual quantitative detection of NO 2 − was proposed, broadening the application of CDs@UiO-66-NH 2 in environmental protection.
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BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2024
·
IF 2.5
Liuxuan Yang,Xianbin Liu,Jing Yang,Ke Wang,Zhenghao Ai,Jinlu Shang,Meiling Zhou
Acute pancreatitis (AP) is a severe inflammatory condition with a rising incidence and high mortality rates, especially in severe cases. Emodin (ED), known for its potent anti-inflammatory properties, holds promise in addressing AP. However, its clinical application is hindered by limitations such as low bioavailability and insufficient target specificity. Herein, we developed a novel drug delivery system using macrophage membrane-coated UiO-66-NH 2 nanoparticles loaded with ED (MVs-UiO-ED). UiO-66-NH 2 was successfully synthesized and characterized, revealing an octahedral structure with a suitable size distribution. The successful loading of ED onto UiO-66-NH 2 was confirmed by ultraviolet and infrared spectroscopy. Subsequently, MVs-UiO-ED was prepared by coating macrophage membrane-derived vesicles onto UiO-ED, resulting in a biomimetic delivery system. In vitro release studies demonstrated that MVs-UiO-ED exhibited a sustained-release profile, indicating its potential for prolonged drug circulation. An AP mouse model was established to evaluate the therapeutic efficacy of MVs-UiO-ED. Compared with the model group, MVs-UiO-ED significantly reduced serum levels of α-amylase and lipase, two indicators of pancreatitis severity. Furthermore, histopathological examinations revealed that MVs-UiO-ED ameliorated pancreatic tissue damage. This study underscores the potential of MVs-UiO-ED as an effective therapeutic approach for AP.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Ying Gao,Yong Liu,Lingling Gao,Jinxing Long
An effective strategy is proposed here for transfer hydrogenation of alkyl levulinate to γ-valerolactone (GVL) using a UiO-66 framework modified with phosphotungstate ionic liquid (UiO-66@IL(HPW)). Due to the intensive influence of ionic liquid fragment, the modification significantly enhances the catalytic activity of UiO-66@IL(HPW), leading to a complete conversion of ethyl levulinate with over 93.1% selectivity for GVL. Characterizations techniques, including XRD, N 2 absorption/desorption, SEM, FT-IR, pyridine FT-IR, NH 3 -TPD and CO 2 -TPD, confirm that while the basic structure of UiO-66-NH 2 is insignificantly changed, the introduction of the ionic liquid greatly improves the acidic/base properties of the catalyst. XAFS and XPS results reveal an intensive interaction between the N and W species in UiO-66@IL(HPW), and the formed W-N/O moiety is responsible for the enhanced catalytic activity. In addition, a plausible catalytic mechanism is proposed based upon in situ DRIFTS and density functional theory (DFT) calculations, highlighting the crucial role of ionic liquid fraction within the UiO-66 ligand. Therefore, this work would contribute to the valorization of biochemicals.
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Journal of Energy Storage
·
2024
·
IF 8.9
Bahaaudin M. Raffah,Haseebul Hassan,Muhammad Waqas Iqbal,Yas Al-Hadeethi,Bassim Arkook
The precisely defined nanostructures are used to develop highly efficient catalysts for processes like the hydrogen evolution reaction (HER) and energy storage. However, this endeavor remains a formidable challenge. The porous Zr-MOF and its composite with molybdenum disulfide were prepared using a straightforward hydrothermal technique. These materials were evaluated for their supercapacitor and hydrogen evolution reaction (HER) in a 1 M KOH electrolyte. The capacitance experiments indicated a noteworthy increase in the specific capacitances to 1392C/g for UiO-66/MoS 2 . The supercapattery was also formed using UiO-66/MoS 2 and activated carbon. The UiO-66/MoS 2 device demonstrates 66.87 Wh/kg energy density at a power density of 1100 W/kg. The findings revealed that UiO-66/MoS 2 exhibited a lower overpotential of 132 mV for HER. The superior HER catalytic performance of UiO-66/MoS 2 was due to the enhanced availability of active sites at the edges and vertices of nanocubes in the nanoflower architecture. This study highlights the UiO-66/MoS 2 can substantially enhance the storage and catalytic activity.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Yi Wang,Tao He,Siying Lv,Jing Yang,Shihai Cui
Novel type of micro mesoporous materials Co-doped NH 2 -UiO-66 had been successfully prepared. The properties of the material were understood through a series of characterization. When the dosage of Zr:Co is 2:1, the modified material showed specific surface area of 840.02 m 2 ∙g −1 , which is larger than the material without Co. Especially, the material was transformed from microporous NH 2 -UiO-66 to micro-mesoporous Co-doped NH 2 -UiO-66 through the adjustment of metal Co. The Co-doped nanocomposite was then applied to the adsorption of oxytetracycline. The effects of initial concentration, pH, humic acid and ionic strength on the adsorption were investigated. It was found that 50 mg∙L −1 oxytetracycline can be effectively adsorbed by Co-doped NH 2 -UiO-66 in pH 7. Further research showed that adsorption was pseudo-second-order kinetics and fitted Freundlich model with the maximum adsorption capacity 223.7 mg∙g −1 . In addition, the adsorption equilibrium time was only 2 h, which is shorter than the adsorption time of most adsorbents. The mechanism of pore adsorption, π-π interaction, hydrogen bonds and electrostatic interactions was deeply discussed. In conclusion, Co-doped NH 2 -UiO-66 was a fast and effective absorbent for the removal of oxytetracycline in aqueous solution.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2024
·
IF 1.1
Zhiwei Zhang,Yilin Ma,Encheng Liu,Junjie Cheng,Fengfeng Chen,Bin Ling,Ningyu Di,Junkuo Gao
Curing agents for epoxy resin (EP) are one of the most important branches in the polymer materials field due to their enormous potential in many fields, but constructing them in a well-controlled curing temperature remains challenging. Herein, a novel curing agent is constructed by the zirconium metal-organic framework (UiO-66) and [P 4442 ] 2 [IDA] through an impregnation method. [P 4442 ] 2 [IDA]@UiO-66 is utilized as a functional nanofiller and curing agent to construct the [P 4442 ] 2 [IDA]@UiO-66/EP nanocomposites. The chemical structures of [P 4442 ] 2 [IDA]@UiO-66 were investigated by XRD, SEM, DSC, and TG characterizations. The various [P 4442 ] 2 [IDA]@UiO-66 with different loading amounts of [P 4442 ] 2 [IDA] were used to investigate the curing behaviors of the EP-51. The DSC results confirm that the curing temperature of the [P 4442 ] 2 [IDA]@UiO-66/EP is higher than that of [P 4442 ] 2 [IDA]/EP. In addition, the kinetic parameters and the activation energy of the curing reaction were acquired according to the fitting of Kissinger equation and Ozawa equation. The drying time of [P 4442 ] 2 [IDA]@UiO-66/EP system at 40 °C was enhanced 17 times compare to that of [P 4442 ] 2 [IDA]/EP system. This study opens new avenues for the rational design of EP nanocomposites by employing ionic liquids@MOFs composite materials as curing agent for wide engineering applications.
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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Ying Luo,Da Lei,Maohua Li,Yuansheng Ge,Jiguang Li,Baiyi Zu,Jun Yao,Xincun Dou
Metal organic frameworks (MOFs) have made great progress in the field of fluorescent sensing; however, whether the electronic structure and recognized sites can be adjusted by external functionalization still remains challenging. Here, by postmodifying 5-carboxyfluorescein (Flu), externally coupled orbitals were introduced into the electronic structure of UiO-66-OH, and thus an effective photo-induced energy transfer (PET) process was established in functionalized MOFs (UiO-66-Flu), resulting in the reduction of the intrinsic blue fluorescence. Due to the formation of the ester bond by effective incorporation of the surface –OH with Flu, the hydrazinolysis reaction triggered by hydrazine could happen and the Zr6O6 clusters could further reduce the reaction energy barrier through strong hydrogen bonding with hydrazine, resulting in a remarkably low limit of detection (LOD, 27.17 nM) and a fast response (4 s). Furthermore, with polyvinylidene fluoride (PVDF) as the dispersion medium, UiO-66-Flu was fabricated into a UiO-66-Flu/PVDF film sensor, enabling the rapid detection of gaseous hydrazine within 2 s in simulated practical scenarios. We expect that the present fluorescent ligand modifying concept will not only deepen the understanding of electronic structure engineering in functionalized MOF design, but also shine light on the exploration of high-performance MOF-based sensing strategies.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·
IF 1.5
Guo Dingge,Xiao Jing,Ning Yang,Yu Hongchao,Jin Tianxiang,Huang Bin,Qian Yong
The efficient removal of thorium from the environment is critical due to the risks it poses to organisms. Metal–organic frameworks are favored by scholars because of their potential to effectively adsorb a variety of heavy metal ions in wastewater treatment. In this work, the interaction of UiO-66-NH 2 surface with graphene, enhances adsorption capacity of MOFs. Optimal adsorption conditions have been identified, and a detailed adsorption mechanism has also been comprehensively discussed. The theoretical maximum adsorption capacity exhibited by UiO-66-GO is 119.57 mg g −1 . Moreover, it shows a fast adsorption rate and reached equilibrium within 20 min. The development of materials with good adsorption performance and fast adsorption for Th(IV) plays an important role in the development of Th(IV) adsorption in the future.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2025
·Vol. 39
·期 4
·e70109
·
IF 0
Yun Xiong,Yifan Shu,Shi Cai,Shengpeng Liu,Xiaoyu Wu
The efficient separation of gases under high-temperature industrial conditions is crucial for addressing global energy and environmental challenges, particularly in processes such as CO₂ capture in natural gas processing, power plant flue gas treatment, and cement plant emissions. However, conventional membranes often suffer from interfacial defects, low gas selectivity, and poor thermal stability, which limit their practical applications. In this study, we aimed to develop high-performance mixed matrix membranes (MMMs) to improve CO₂/CH₄ separation performance. Amino-functionalized UiO-66-NH₂ was incorporated into a polyimide (PI) matrix using a simple, scalable fabrication process involving phase inversion and thermal imidization, which ensured uniform dispersion of UiO-66-NH₂ particles and facilitated large-scale production of dense, defect-free membranes. At an optimal UiO-66-NH₂ loading of 2 wt%, the MMMs achieved a CO₂ permeability of 451 Barrer and a CO₂/CH₄ selectivity of 6.62 at 25°C and 0.1 MPa, representing improvements of 23.91% and 114.94%, respectively, compared to pure PI membranes. The performance enhancement was attributed to the increased free volume within the membrane and the strong Lewis acid–base interactions between the amino groups of UiO-66-NH₂ and CO₂ molecules. Long-term stability testing at 300°C demonstrated excellent thermal stability, with consistent gas separation performance maintained over 160 h, confirming the membranes' suitability for high-temperature industrial applications. Furthermore, the UiO-66-NH₂/PI MMMs achieved an excellent balance between high permeability and selectivity, outperforming both organic and inorganic membranes, as well as certain traditional MOF-based MMMs. These findings offer a promising strategy for the development of robust and sustainable MMMs for high-temperature industrial gas separation processes.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiangrong Li,Shaohua Xie,Dongman Hou,Wenliang Wang,Guoqiang Li
Indium nitride (InN) exhibited significant potential as a photoelectrode material for photoelectrochemical (PEC) water splitting, attributed to its superior light absorption, high electron mobility, and direct bandgap. However, its practical application was constrained by rapid carrier recombination occurring within the bulk and at the surface. To address these limitations, researchers developed InN/UiO-66 heterojunction photoelectrodes, which markedly enhanced PEC water splitting for hydrogen production. Functionalization of the UiO-66 metal–organic framework (MOF) with hydroxyl (–OH) groups optimized the bandgap and improved light absorption, facilitating efficient charge separation and transfer processes. The functionalization also mitigated surface defect states in the InN nanorods (NRs), which were a major source of photogenerated carrier recombination, thereby enhancing overall photocatalytic activity. Compared to pristine InN NRs, the optimized InN/UiO-66-(OH) 2 electrode achieved a photocurrent density of −0.42 mA cm −2 and an applied bias photon-to-current efficiency (ABPE) of 0.47 % at −0.5 V vs. reversible hydrogen electrode (RHE). Furthermore, the InN/Ag/UiO-66-(OH) 2 system demonstrated a hydrogen production rate of 1.82 μmol min −1 under AM 1.5G illumination, with excellent long-term stability. This study provided critical insights into the design of efficient and durable PEC photoelectrodes, achieved the highest hydrogen yield reported for indium-based photocathodes to date, and underscored the promise of InN-based materials for solar-driven hydrogen production in the context of clean energy applications.
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