JOURNAL OF MEMBRANE SCIENCE
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2017
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IF 6.035
Mingmin Jia,Yi Feng,Shichang Liu,Jianhao Qiu,Jianfeng Yao
UiO-66-NH 2 were either intercalated into graphene oxide (GO) layers (GOU@S) or covered by GO layers (GO/U@S) to form UiO-66-NH 2 /GO composite membrane . Results show that different synthesis methods would lead to different membrane morphology, thickness and gas separation performance. For GOU@S membrane, UiO-66-NH 2 was well-dispersed and intercalated into GO layer, whereas two continuous layers (GO and UiO-66 layer) with an obvious boundary were observed for GO/U@S. Due to the morphology and structure difference, better hydrogen separation performance was achieved for GOU@S membrane compared to GO/U@S membrane and pristine membrane due to the close interfacial contact between UiO-66-NH 2 and GO, which arises from the hydrogen bonding formed between -NH 2 group in UiO-66-NH 2 and -OH group in GO and the electrostatic force between UiO-66-NH 2 and GO layers. The ideal selectivities of H 2 /N 2 and H 2 /CO 2 were increased to 9.75 and 6.35, respectively, for the GOU@S membrane with a H 2 permeance of 3.9 × 10 −8 mol m −2 s −1 Pa −1 .
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CHEMOSPHERE
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2024
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IF 8.1
Xiaochang Lin,Bo Sun,Pengsen Wang,Min Zhao,Dejia Liu,Qiyu Zhang,Baile Wu,Dezhao Liu
A magnetic Fe n UiO-66 adsorbent was created to achieve high phosphate adsorption capacity. The incorporation of Fe 3 O 4 facilitated the precipitation and growth of UiO-66 during crystallization, resulting in a shift towards a multilayer heterogeneous distribution of adsorption sites. The increased Fe 3 O 4 content notably enhanced the magnetic properties of Fe n UiO-66, while negligibly affecting its adsorption performance. The Fe 1.5 UiO-66 demonstrated exceptional phosphate adsorption capacity (136.54 mg/g), outstanding selectivity, and sustained reusability, with an 80% removal efficiency after nine cycles of treating actual water. The mechanism of phosphate adsorption by Fe n UiO-66 involved electrostatic attraction, ligand exchange, and linker exchange. Notably, while linker exchange significantly contributed to high adsorption capacity, it resulted in irreversible damage to the Fe n UiO-66 crystal. These unequivocal findings will serve as a solid foundation for further research and underline the critical role of linkers in the process of phosphate adsorption.
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Journal of Cleaner Production
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2024
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IF 9.7
Li He,Zichang Yang,Yuyao Xu,Xingkai Lu,Sory Kaba,Changming Li,Xiaolong Yao,Dong Xu,Zhiliang Yao
Odor pollutants produced by broiler houses can significantly impact the quality of the life of residents and the ecological environment, so it is crucial to explore odor purification technologies. In this study, a defect-rich CuUiO-66@TiO 2 photocatalyst was successfully synthesized for the photocatalytic degradation of five typical odors in broiler houses. CuUiO-66 and TiO 2 in a 1:3 ratio was the most effective in removing odors, capable of removing 99% of methyl mercaptan, 99% of dimethyl sulfide, 99% of dimethyl disulphide, 86.47% of toluene and 63.09% of ethyl acetate in 60 min. After five cycles degradation, the photocatalyst can remain the crystal structure and keep the photocatalytic degradation rate at 95.2% of methyl mercaptan. Furthermore, the proposed mechanisms for the removal of five odors by CU1T3 have been discussed. Therefore, this study has developed a highly efficient photocatalyst that can effectively eliminate odors emitted from broiler houses. This is a promising solution to address the challenges of odor treatment in the near future.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Dawei Lan,Huiwen Zhu,Jianwen Zhang,Chengrui Xie,Fan Wang,Yueying Zheng,Zeyu Guo,Mengxia Xu,Tao Wu
In this research, a novel composite of typical Zr-based metal–organic frameworks (UiO-66) with porous graphitic carbon nitride (g-C 3 N 4 ) was prepared by an in-situ preparation method. The g-C 3 N 4 /UiO-66 nanohybrids (CNU-0.5chieved almost 100 % efficiency in the degradation of RhB (60 mg/L, 100 mL) within 70 min under visible light, which was 6.46 and 10.56 times faster than that of pure g-C 3 N 4 and UiO-66, respectively. The improved photocatalytic properties were attributed to the large surface area, enhanced optical adsorption ability and the creation of heterojunction between g-C 3 N 4 and UiO-66. The formation of the heterojunction structure enhanced the photoelectron transfer efficiency and reduced the recombination of electron/hole pairs. Furthermore, the trapping experiments showed that •O 2 – , h + and •OH were the active species in the photodegradation process, with •O 2 – playing a dominant role. This study offers valuable insights into the preparation of MOF-based photocatalysts with exceptional effectiveness for the removal of contaminants in wastewater treatment.
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Molecular Catalysis
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2024
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IF 3.9
Yuhao Yang,Minghui Tan,Hailun Geng,Xiujuan Gao,Yisheng Tan,Qingde Zhang
Oriented designing the microenvironment of catalytic sites is essential for understanding catalytic processes. In this work, EDTA was first grafted in UiO-66 and then chelated Rh to obtain an efficient catalyst for 1-hexene hydroformylation reaction. EDTA not only served as a chelation site for Rh immobilization in UiO-66, but also markedly influenced the structure and properties of Rh/UiO-66. The incorporation of EDTA reduced the micropore content and suppressed the formation of heavy products. Moreover, the grafted EDTA regulated the electronic state of Rh effectively to improve the CO and propene adsorption, thus constructing an appropriate microenvironment for hydroformylation. Therefore, EDTA-modified Rh/U-E catalyst exhibited higher aldehydes yield, TOF and stability than Rh/U without EDTA. The dual role of EDTA in anchoring Rh sites and modulating the microenvironment for hydroformylation provides more prospects for designing customized MOFs-based catalysts.
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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.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yu Jiang,Si-Chao Liu,Li-Ping Zhang,Guo-Wei Guan,Yi-Tao Li,Shuang Ni,Run-Yuan Jiang,Su-Tao Zheng,Hao-Ran Liu,Hao-Ling Lan,Qing-Yuan Yang
The photocatalytic reduction of carbon dioxide (CO 2 ) to carbon-based materials is challenging because of its intricate nature and the generation of multiple byproducts. Hence, developing photocatalysts with a high CO 2 -reduction yield and selectivity is critical. In this study, new photocatalysts (U-B-M, M = Co, Ni) were synthesized by incorporating 1,2-benzisothiazolin-3-one (BIT) into NH 2 -UiO-66, to create N, N’-chelating sites via an amine–aldehyde condensation reaction, followed by metal-ion chelation. The introduction of BIT decreased the resistance of the catalyst and enhanced the separation of photogenerated carriers. The catalytic performance of U-B-Ni (rate: 3.10 mmol·g −1 ·h −1 ; selectivity: 97 %) surpasses those most of all previously reported MOF-based photocatalysts. Moreover, U-B-Ni shows high stability and negligible deactivation on catalytic cycling for over 16 h. This study expands the utility of metal–organic frameworks (MOF) in photocatalysis and highlights the importance of amine–aldehyde condensation in MOF modification.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Qiancan Wang,Dongchen Shen,Zhengkai Tu,Song Li
Incorporating metal-organic frameworks (MOFs) especially the ones with protic functional groups into proton exchange membrane (PEM) can effectively improve its proton conductivity . Lanthanide MOFs (Ln-MOFs) have been recognized as more potential candidates exhibiting proton dissociation capability. However, the performance of PEM upon integrating Ln-MOFs in water electrolyzer has yet to be investigated. In this study, Nafion composites with different loadings of lanthanide Ce-UiO-66 were prepared, characterized and tested by comparing with the non-lanthanide Zr-UiO-66. It was revealed that the proton conductivity of Ce-UiO-66/Nafion composite membrane was higher than pristine Nafion and Zr-UiO-66/Nafion membrane, which was attributed to the fact that the Ce-UiO-66 doping contributed to the construction of the hydrogen-bonded network to enhance the proton conductivity. At 3 wt% Ce-UiO-66 doping, the proton conductivity of the composite membrane can reach 124.45 mS/cm, which is significantly improved by 17 % compared with Zr-UiO-66/Nafion. Such a trend is mainly contributed by the lower proton affinity and proton transfer capability of Ce atoms in Ce-UiO-66, and the higher number of water molecules around Ce atoms favors the reduced tortuosity of the proton conduction pathway in membranes. Single electrolytic cell tests demonstrated the enhancement of electrolysis efficiency upon Ce-UiO-66 doping was improved from 58.77 % to 65.37 % at a current density of 2 A cm −2 .
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xingyu Zhang,Lin Chen,Longjie Jiang,Liang Zhu,Chuqing Cao,Wei Zhang,Linting Zhao,Jiaqi Xu,Han Liu
In the advent of the new energy era, the global demand for lithium is increasing rapidly. The recovery of Li + and Co 2+ from the leachate of high-quality spent lithium-ion batteries (LIBs) offers significant economic and environmental benefits. This study proposes a TFC-ON-MOF membrane prepared through a combination of in situ growth and interfacial polymerization (IP) for the recovery of Co 2+ and Li + from battery leachate. Operated in an electrodialysis (ED) system, the experimental results demonstrated that the optimum Li + membrane flux was observed to reach 1.02 μmol cm −2 min −1 at 7.5 mA cm −2 , with the selectivity remaining at 19.84, which exemplifies well-separation and permeation performance. Following several operational cycles, the separation performance remained stable, and the membrane exhibited enhanced fouling resistance relative to commercial monovalent selective cation exchange membranes (CSO). The composite membrane features sub-nanometer windows and nanometer-sized cavities, enabling selective permeation of Li + while simultaneously sequestering Co 2+ . The inclusion of auxiliary permeation groups (PSS) also enhances overall permeation performance and selectivity. The findings contribute to the design of composite metal–organic frameworks and provide a novel approach for the selective separation of heavy metal ions from spent lithium batteries, thereby promoting the efficient recycling of valuable metal resources.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Fan Yang,Hui-Hui Xie,Fan Du,Xiaomin Hou,Si-Fu Tang
Enzyme immobilization is an effective strategy for achieving efficient and sustainable enzyme catalysis. As a kind of promising enzyme-loading materials, the systematic research on zirconium based metal organic frameworks (Zr-MOFs) about immobilization performance at molecular level is still in its initial stage. In this work, UiO-66 was functionalized with various groups (-H, -NH 2 , -COOH, -OH, -2OH) for the immobilization of cytochrome c (Cyt c) and antioxidant enzyme catalase (CAT). Then the effects of surface-functionalized UiO-66 derivatives on the loading efficiency, enzyme stability and catalysis kinetics were systematically investigated. In addition, the affinity constants of Cyt c and CAT towards UiO-66-series MOFs carriers were also compared. The results have shown that hydroxyl group functionalized UiO-66 represents the highest enzyme loading capacity, enhanced activity and improved stability for Cyt c and CAT possibly due to high surface area and suitable microenvironments as well as enhanced affinity towards the enzymes provided by the introduction of a single hydroxyl group. Our research would foresee immense potential of MOFs in engineering biocatalysts.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Panpan Liu,Qinglei Xing,Runqing Huang,Peng Bai,Jiafei Lyu
This study explores the incorporation of three Zr-based MOFs with varying pore structures (UiO-66, NU-906, and NU-1008) into a polyphenylsulfone (PPSU) matrix for dye and salt separation, highlighting that UiO-66/PPSU membrane exhibits superior permeability and separation performance. To enhance the compatibility of the MOF with the matrix and improve the antifouling performance, hydrophilic diethylenetriamine was grafted onto UiO-66. The strengthened hydrogen bonding between DETA-UiO-66 and PPSU improved its dispersibility in the polymer matrix and increased the mechanical strength of the MMMs. Moreover, the incorporation of hydrophilic DETA-UiO-66 nanoparticles enhanced the pore structures and hydrophilicity of the DETA-UiO-66/PPSU membranes, enabling them to exhibit higher permeability and antifouling performance. The 1.0wt%DETA-UiO-66/PPSU membrane exhibited a substantial increase in water flux to 16.52 LMH·bar −1 , threefold and double higher than the pure PPSU membrane and UiO-66/PPSU membrane. Meanwhile, high rejection rates of 99.3% for reactive orange 16, 99.6% for brilliant blue G, and 99.7% for rose Bengal were demonstrated with low NaCl retention rate of 7.69% at a high salt concentration of 5000 mg/L, achieving a high salt/dye separation factor of 184.6 under the size sieving and the Donnan exclusion mechanisms. Moreover, integrating DETA-UiO-66 significantly improved the antifouling performance with the flux recovery rate increased from 71.6% to 95.2% and the irreversible fouling ratio decreased to 4.8%. DETA-UiO-66/PPSU membrane also exhibited excellent stability where the mechanical integrity and separation performance were maintained in the 100-hour dye/salt separation process. This research highlights the promising application of DETA-UiO-66 in the fabrication of advanced mixed matrix nanofiltration membranes and offers valuable insights into the integration of various modified hydrophilic MOFs for the design of efficient water treatment membranes.
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Desalination and Water Treatment
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2024
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IF 1
Yang Shen,Fatoye Sawyerr,Lunbo Xu,Shusu Shen,Xiaoji Zhou
The preparation of modified membranes utilizing the UiO-66 framework for wastewater filtration is regarded as one of the most promising approaches to wastewater treatment, owing to its high efficiency and cost-effectiveness. In this study, a post-modified MOF, UiO-66-RSA, was synthesized via the condensation reaction of UiO-66-NH 2 and 2,4-dihydroxybenzaldehyde. PVDF mixed matrix membranes (MMMs) were fabricated for the first time by mixing UiO-66-RSA into PVDF using the non-solvent induced phase separation (NIPS) method. Compared to pure PVDF membranes, the newly developed membrane, M4, demonstrated enhanced compatibility and superior mechanical strength. In dyeing wastewater treatment applications, M4 showed excellent separation efficiency for dye and heavy metal mixed wastewater, achieving rejection rates exceeding 90 %. Additionally, it maintained a high flux recovery rate (FRR > 90 %) and rejection rate (Rejection > 90 %) after six filtration cycles of dye-containing wastewater, indicating strong recyclability. These findings suggest that MMMs embedded with UiO-66-RSA hold significant promise for dyeing wastewater treatment.
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