查找使用阿拉丁产品的科研文献

In-situ silver-bridged interfaces drive Z-scheme coupling on iron-doped NH2-UiO-66(Zr)/silver iodide for efficient aqueous antibiotic degradation

Haileyesus Hatano Haitosa,Osman Ahmed Zelekew,Pu Chen,Daniel Manaye Kabtamu,Weimao Yan,Hong Wang,Yi-nan Wu

Fluoroquinolone antibiotics like ciprofloxacin (CIP) pose environmental risks when released into water. Herein, a visible-light-active Fe-doped NH 2 -UiO-66(Zr)@AgI Z -scheme heterostructure was prepared via an ion exchange precipitation method. By varying AgI content, reduced particle size and enhanced charge separation for efficient photodegradation was achieved. The optimum composition (Fe-UNH@AgI-20) exhibited a 95.2 % degradation efficiency toward CIP after 60 min of visible-light irradiation. It also showed high removal efficiencies for tetracycline, lomefloxacin, and Rhodamine B. Reaction kinetics followed pseudo-first-order behavior, with rate constants significantly higher than those of pristine NH 2 -UiO-66(Zr) and AgI. The catalyst maintained 85.1 % activity after cycles, indicating good stability. Scavenger tests and electron paramagnetic resonance (EPR) analyses identified holes (h + ), superoxide radical (•O 2 − ), and hydroxyl radical (•OH) as key reactive species. Fe doping enhanced visible-light absorption and created defect sites, while AgI introduction promoted charge separation and suppressed AgI photocorrosion. Under irradiation, a small fraction of Ag + was reduced to metallic Ag, forming an electron bridge that switched the initial type-II heterojunction to a Z -scheme configuration. This Z-scheme mechanism efficiently separated carriers, facilitated generation of ROS, and enabled thorough mineralization of CIP; toxicity predictions showed most products were less mutagenic than CIP, confirming reduced ecological risk. The findings demonstrate that the Fe-doped NH 2 -UiO-66(Zr)@AgI heterostructure is a promising photocatalyst for antibiotic-contaminated wastewater remediation.

In Situ Determination of Chloride Ions Using a Novel Double-Layer Membrane Optical Fiber Sensor Modified with the UiO-66-NH2/Lucigenin Complex

Chloride quantification is crucial for environmental monitoring, marine research, and the durability assessment of geotechnical infrastructures, yet accurate measurement in complex aqueous and soil matrices remains challenging. Optical fiber sensors offer distinct advantages, including resistance to electromagnetic interference, high sensitivity and low cost. Unfortunately, existing fiber-optic chloride sensors are often limited by insufficient sensitivity, poor anti-ion interference, inadequate portability, and an inability to perform long-term in situ monitoring. Herein, a novel fluorescent optical fiber chloride sensor based on UiO-66-NH2/lucigenin composite is fabricated, in which the mixture formed lucigenin encapsulated with UiO-66-NH2is immobilized within a dual-layer membrane composed of an inner cellulose acetate (CA) matrix and an outer polyvinyl alcohol (PVA) membrane. The chloride-responsive fluorescent probe operates on the principle of fluorescence quenching. The dual-layer sensitive membrane is engineered to significantly enhance sensitivity, linearity, and stability for long-term monitoring. Furthermore, the portable device eliminates the constraints of bulky optical systems and mitigates instability caused by photobleaching, enabling reliable in situ chloride detection in water, soil, and geotechnical environments. Experimental results confirm the superior analytical performance of the sensor across various soil and aquatic media. This work represents a notable advancement in the field of fluorescent optical fiber sensors and holds substantial promise for practical applications.

Modulating the Overall Properties of PEO/NaTFSI Electrolytes via UiO-66 Fibrous Membranes with Different Functional Groups for Solid-State Sodium Metal Batteries

Wen Qin,Wenhao Pan,Jialing Zhang,Junyan Tang,Jiming Huang,Mi Tang,Zhengbang Wang

Solid-state sodium metal batteries (SSMBs) have emerged as one of the next-generation rechargeable batteries due to their low-cost, high-energy-density, and desirable safety. However, their applications mainly depend on high-performance solid-state electrolytes. Herein, a series of polymer electrolytes is developed by compositing PEO/NaTFSI electrolytes into the PAN/UiO-66-X (X = NH2, NO2, F) nanofiber membranes, and the PAN/UiO-66-X are prepared by in situ growth of UiO-66-X MOFs on the PAN electrospinning nanofiber membranes. All the recovered PEO/PAN/UiO-66-X composite electrolytes possess a highly compact structure with a thickness of around 40 μm. The continuous dense UiO-66-X coatings not only improve mechanical strength of the electrolytes but also provide continuous Na+ transport pathways for high ionic conductivity. In addition, the interconnected pore structure with abundant Lewis acidic metal sites demonstrates strong anion-trapping effects for a high ionic transfer number. As a result, all of the batteries assembled with PEO/PAN/UiO-66-X electrolytes exhibit outstanding rate performance and cycling stability. In particular, the PEO/PAN/UiO-66-X electrolyte is the best with the highest ionic transfer number of 0.87, which could deliver more than 7000 h at 0.1 mA cm–2 in Na//Na symmetric cell and more than 600 cycles at 1C in NVP//Na full cell.

Enhancing polymer compatibility and dispersibility of nanofiller via Zn2+-PVAm synergistically modified UIO-66-(COOH)2 for preparing high-performance CO2-separation MMMs

Zhiyuan Huang,Ye Yuan,Weifan Wang,Hao Zheng,Zhi Wang

Mixed matrix membranes (MMMs) have demonstrated remarkable advantages in gas separation applications through the synergistic integration of polymeric matrices and nanostructured reinforcements. While these advanced composite thin-film materials exhibit substantial potential for CO 2 separation, their industrial-scale implementation confronts threefold challenges: elevated manufacturing costs, interfacial compatibility optimization between nanofillers and polymer matrices, and performance enhancement requirements for achieving superior separation efficiency. In this study, the green and economical nanofiller UIO-66-(COOH) 2 (denoted as UC) was strategically selected. A novel strategy involving synergistic modification using Zn 2+ and polyvinylamine (PVAm) was developed to address the critical challenge of severe particle agglomeration and sedimentation. This phenomenon, caused by intense electrostatic interactions between the strongly negatively charged UC and the cationic polymer PVAm during surface modification, was effectively mitigated through the proposed cooperative modification mechanism, resulting in the successful synthesis of P@UC-Zn exhibiting exceptional dispersibility and enhanced compatibility with the polymeric matrix. The fabricated P@UC-Zn-PVAm/mPSf MMMs containing 35 wt% filler exhibited remarkable CO 2 permeance (3250 GPU) and selectivity (166) under feed gas conditions (CO 2 /N 2  = 15/85 vol%, feed pressure: 2 bar). Furthermore, the optimized MMMs demonstrated robust operational stability in simulated flue gas tests and showed potential for applications in carbon dioxide-methane and carbon dioxide-hydrogen separations.

Cu-based methanol steam reforming catalyst supported by heat conduction enhanced GO+UiO-66 composite MOF material for long-term stable hydrogen production

Wantong Wang,Shun Liu,Wenda Wu,Yimei Zhang,Xiaoze Du

Cu-based methanol steam reforming (MSR) catalysts are generally facing the fatal problems of easy sintering at high temperatures and poor long-term stability. In this study, we synthesized a series of Cu-based MSR catalysts supported by pure UiO-66 MOF and GO + UiO-66 composite materials with varying GO oxidation degrees and mass fractions through conventional thermal solvent impregnation. Comprehensively analysis revealed that both the specific surface area and thermal conductivity of the Cu@GO + UiO-66 catalysts exhibited positive correlations with those of their corresponding support materials. The optimal-performing [email protected]  wt%GO-0.3+UiO-66 catalyst demonstrated exceptional MSR catalyst performance, achieving 98.50 % methanol conversion at 300 °C with an inlet flow rate of 0.014 ml/min (4.18 h −1 ), while maintaining remarkably low CO selectivity (2.02 %) and high hydrogen productivity (6.82mmol/(min·g)). It also showed outstanding stability with only 10.38 % and 8.06 % decrease in methanol conversion and hydrogen productivity after continuous operation of 96 h. The excellent catalytic performance and stability were attributed to the significant and well-dispersed Cu loading (28.04 wt%), the high specific surface area of 128.83 m 2 /g (BET) and the enhanced thermal conductivity of 0.80W/(m·K) which were achieved through the use of the modified-0.01 wt%GO-0.3+UiO-66 support. Moreover, a minor amount of GO in the support was conducive to the formation of Cu + , and the abundant oxygen vacancies inside the catalyst could further stabilize the Cu + active sites, resulting in the formation of Cu–Zr-O x interfacial structures and the strong interaction between Cu species and the support, which effectively enhanced the catalytic performance and stability of the catalyst.

Controllable Preparation of Novel UiO-66-NH2/g-C3N5 Thin-Film Nanocomposite Nanofiltration Membranes with Efficient Photocatalytic Pollutant Removal and Anti-Fouling Ability

Tian Jianghao,Xiao Min,Li Shifeng,Bu Ruiying,Yang Xin,Zhang Hongling,Chen Xiaoyang

To overcome membrane permeation selectivity defects and mitigate membrane fouling, a novel nanocomposite, UiO-66-NH 2 /g-C 3 N 5 (UNCN), was designed and synthesized. Notably, this composite overcomes the inherent limitations of UiO-66-NH 2 (limited visible light absorption) and g-C 3 N 5 (low specific surface area). The optimal composite ratio was determined to be 3:7 through systematic optimization. The UNCN-3:7 nanocomposite was then embedded into the polyamide selective layer on polysulfone via in situ interfacial polymerization under optimal conditions, resulting in a thin film nanocomposite (TFN) Nanofiltration membrane. Characterization revealed that the UNCN-3:7 Nanocomposites were uniformly distributed within the polyamide (PA) matrix. The resulting TFN Nanofiltration membrane possessed an ultrathin, positively charged selective layer with enhanced hydrophilicity, evidenced by a reduction in water contact angle from 60.3° to 47.3°. It exhibited a 43% increase in pure water permeability compared to the unmodified thin film composite (TFC) membrane (52.7 vs. 36.9 L·m −2 ·h −1 ·bar −1 ), while maintaining an excellent Na 2 SO 4 retention rate (> 96%). Furthermore, the membrane demonstrated excellent photocatalytic degradation performance, superior anti-fouling properties (flux recovery rate > 92%), and stable long-term operation. These results indicate that the construction of the novel UNCN nanocomposite Nanofiltration membrane presents an effective strategy to address membrane fouling issues.

A synergistic strategy of hierarchical pore engineering and ligand functionalization: Modulating Ni sites in Ce-UiO-66 for dicyclopentadiene hydrogenation under mild conditions

Yunqi Zhang,Tianyu Zhang,Yifei Ye,Xinmeng Xu,Wenjuan Xiang,Xiubing Huang,Ge Wang

The development of catalytic activity for non-noble metals at low temperature features significant value for green chemical production with high economic interest. This work has successfully customized a series of ligand-functionalized and hierarchically porous Ce-UiO-66-X (HP-U(Ce)-X, -X= -NH2, -H, -NO2, -Br) as supports through the soft template methods, achieving the organic combination of bifunctional structures, providing abundant mesoporous channels for high exposure of guest Ni sites and efficient mass transfer of reaction substrates. The presence of electron-withdrawing/donating groups also facilitates electronic structure modification of Ni species. Therefore, with the selection of optimal -Br and synergistic improvement of mesoporous structures by formic acid (FA) and nitric acid (HNO3), Ni loaded on HP-U(Ce)-Br-6-4 obtains the lowest electron density and outstanding accessibility, reaching 100% conversion of dicyclopentadiene (DCPD) and ~100% selectivity for tetrahydrodicyclopentadiene (THDCPD) in only 30 min at 70 ℃ (while selectivity up to 95% at 60 ℃). This study provides new insight and guidance for performance modulation of non-noble metal based catalysts and rational integration of multifunctional structures in porous materials.

Efficient and selective removal of Cr(VI) by the modified UiO-66-NH2 with phenothiazine-N-rhodanine from aqueous solution: Performance and mechanisms

Hao Wang,Shuai Wang,Shixing Wang,Libo Zhang,Yang Zhou,Fan Yang

In the past decades, due to the worst effect of hexavalent chromium on human and environmental health, people have been committed to removing hexavalent chromium from industrial wastewater. In recent years, metal organic frameworks (MOFs) adsorbents have attracted more and more attention in the removal of pollutants from water. Here, an efficient and selective adsorbent(UiO-66-PRAA) was prepared by modified UiO-66-NH 2 with phenothiazine-N-rhodanine to remove Cr(VI) ion from wastewater. The maximum absorption capacity of UiO-66-PRAA at 303 K and pH = 2 was 333.67 mg/g for Cr(VI). Which is higher than that of bare UiO-66-NH 2 . Elovich kinetic and Sips isotherm models are more suitable for describing the adsorption process of Cr(VI) on UiO-66-PRAA, which indicates that the process is a chemically controlled multilayer adsorption. In addition, the removal mechanisms include chelation, ion exchange and reduction. The adsorbent still shows good adsorption performance under the coexistence of different ions. The excellent cycle performance of UiO-66-PRAA confirms its high potential in removing Cr(VI) from polluted water. In general, UiO-66-PRAA has been shown well adsorption properties and reusability, and our finding might provide a new idea for developing efficient and reusable adsorbent to remove Cr(VI) from wastewater.

Introduction of cluster-to-metal charge transfer in UiO-66-NH2 for enhancing photocatalytic degradation of bisphenol a in the existence of peroxymonosulfate

Shi-Wen Lv,Xiaoran Wang,Xing Wei,Yi Zhang,Yanqing Cong,Lin Che

Nowadays photocatalysis assisted advanced oxidation processes exhibited a great application prospects in pollution control. Herein, for the first time, a series of transition metal modified UiO-66-NH 2 (namely Fe-UiO-66-NH 2 , Co-UiO-66-NH 2 and Ni-UiO-66-NH 2 ) were synthesized via a simple method. After that, these functional materials were employed as photocatalyst to activate PMS for degrading BPA under visible light irradiation. Significantly, prepared Fe-UiO-66-NH 2 exhibited the highest photocatalytic activity among these samples. More importantly, proposed Fe-UiO-66-NH 2 /PMS/light oxidation system showed excellent degradation ability for various organic pollutants, including BPA, TC, OFX, IBP as well as SMX. Owing to the occurrence of d-d transitions after the coordination of transition metal ions, UiO-66-NH 2 displayed the enhanced utilization efficiency of visible light. Furthermore, introduced Fe ion as a mediator could boost the charge transfer by the cluster-to-metal way, thereby effectively inhibiting the recombination of photogenerated electrons and holes. In addition, embedding cluster-to-metal charge transfer in UiO-66-NH 2 modified the band structure, and both SO 4 −• and OH were major active species in the photocatalytic reaction system. Developed Fe-UiO-66-NH 2 /PMS/light oxidation system with good stability also presented great antibacterial performance. To sum up, current work could provide some novel inspirations for designing the high-efficiency photocatalyst.

UiO-66-NH2/PVA composite Janus membrane with a dense hydrophilic surface layer for strong resistance to fouling and wettability in membrane distillation

Lin Chen,Fangqing Li,Longjie Jiang,Fudong He,Yufei Wei

Polytetrafluoroethylene (PTFE) hydrophobic membranes used in direct contact membrane distillation (DCMD) processes were prone to fouling and wetting by oil and surfactants, which hampered their broad industrial application. In this work, a new Janus composite membrane was developed by modifying UiO-66-NH 2 with polyvinyl alcohol (PVA) as a cross-linking agent and immobilizing the modified UiO-66-NH 2 on the PTFE membrane by vacuum filtration. By tuning the ratio of PVA to MOF , an optimally proportioned Janus membrane was obtained, and its performance was tested in DCMD experiments through the use of a sodium chloride feed solution containing hexadecane and sodium dodecyl sulfate. The top layer of this Janus membrane exhibited underwater oleophobicity (130.1 ± 0.96°) and hydrophilicity in the air (54.0 ± 0.92°), while the bottom layer is hydrophobic (132.3 ± 0.97°). Compared to the pristine PTFE membrane, the modified Janus membrane demonstrated promising resistance to both membrane fouling and wetting of oils and surfactants. The desalination rate of 99.99% was still achieved within 24 h with the conductivity remaining lower than 10 μS/cm and the flux maintained at 21.3 L/(m 2 ·h). As a result, the Janus composite membrane developed in this study was shown to be a prospective alternative for treating wastewater containing oily substances and surfactants in a resourceful manner.

Embedding Cs2AgBiBr6 QDs into Ce-UiO-66-H to in situ construct a novel bifunctional material for capturing and photocatalytic reduction of CO2

Lan Ding,Fenghua Bai,Burenbayaer Borjigin,Yuning Li,Huiqin Li,Xiaojing Wang

Solar-energy-driven CO 2 conversion into valuable chemical fuels holds great renewable potential. However, most photocatalysts' weak CO 2 adsorption limits more artificial photosynthesis for further utilization. Herein, we present an in situ assembling approach to produce stable Cs 2 AgBiBr 6 /Ce-UiO-66-H composite, in which a tight contact interface between the two participated components was constructed. Benefiting from the photocatalytic properties and high adsorption capacity for CO 2 , the optimized 20Cs 2 AgBiBr 6 /Ce-UiO-66-H adsorption-photocatalyst exhibits outstanding performance for reductive CO 2 deoxygenation with considerable CO generation rate (309.01 μmol g −1 h −1 ) under simulated solar light irradiation with 300 W Xe lamp, which is about 2.1 and 2.7 times than that of pure Cs 2 AgBiBr 6 and Ce-UiO-66-H, respectively. The excellent catalytic conversion of CO 2 is ascribed to the effective solar harvest and quickly photo-excited carriers’ separation in such assembled architecture. Importantly, due to the in-situ synthesis, Cs 2 AgBiBr 6 QDs are intercalated in the Ce-UiO-66-H frameworks and it could lead to improved stability and induce abundant oxygen vacancies in Cs 2 AgBiBr 6 /Ce-UiO-66-H, which can maintain unchangeable CO 2 conversion rate under wet air with consecutive ten hours of the recycling test. In this work, the combining metal–organic frameworks and lead-free halide perovskite provide great potential for artificial photocatalytic CO 2 -to-CO conversion under a mild gas–solid reaction condition via utilizing solar energy.

A novel visible-light-induced double Z-scheme photocatalytic system: NH2-UiO-66/BiOBr/Bi2S3 for degradation of tetracycline hydrochloride and rhodamine B

Rui Zhang,Ziyin Chen,Yu Li,Chen Zhao,Lu Cai,Junrong Yu,Ze Yang,Jiacheng Jiang

The unique properties of MOFs make them the best candidates for catalytic and photocatalytic applications. In this research, the NH 2 -UiO-66 material was prepared by solvothermal method , and different content of NH 2 -UiO-66 was added before the composite growth of Bi 2 S 3 and BiOBr nanomaterials to obtain the NH 2 -UiO-66/BiOBr/Bi 2 S 3 ternary composite material. In order to investigate the relationship between the structure and properties of the catalyst, XRD , FT-IR, SEM , HRTEM , UV–vis DRS, XPS and other characterization technologies were used to analyze the structure, morphology, optical properties of the samples, showing that NH 2 -UiO-66/BiOBr/Bi 2 S 3 have been successfully synthesized. Their photocatalytic performance was evaluated based on the photocatalytic degradation of tetracycline hydrochloride and rhodamine B under visible light . The results show that 2% NH 2 -UiO-66/BiOBr/Bi 2 S 3 has better photocatalytic activity than other materials. Moreover, NH 2 -UiO-66/BiOBr/Bi 2 S 3 also demonstrated good photocatalytic reusability and stability. The formation of Bi 2 S 3 and BiOBr heterojunctions and the introduction of NH 2 -UiO-66 with more active sites increase the carrier performance and separation efficiency. Then the valence band and conduction band values of the semiconductor material are calculated through the M-S curve, combined with the forbidden bandwidth deduced by UV–vis DRS and the experimental results of radical trapping, a double Z-type electron transfer mechanism suitable for this system is inferred. Finally, taking RhB as an example, the degradation path of dye pollutants was studied.