SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xingxing Wang,Jian Gao,Shuaichuan Cui,Shihan Liu,Yifan Huang,Yifan Zhang,Pengyang Deng
Separation membranes with high solvent permeation and rejection are attractive for energy conservation in waste solvents separation. Herein, ultra-high flux dye separation membrane was firstly obtained by in situ growing continuous thin MOF membranes on commercial non woven fabrics, which overcome the “trade-off” effect of traditional separation membranes. The continuity of MOF membrane is closely related to the grafting density of maleic anhydride (MAH), and the thickness and surface morphology of continuous thin UiO-66-NH 2 membrane (CTUM) can be controlled by tuning reaction time. The CTUM exhibits a molecule weight cut-off of 950 Da and organic solvents permeation of > 2200 L m −2 h −1 bar −1 with the rose bengal (RB) rejection of 99.39 %. The selectivity of CTUM depends on the size screening and electrorepulsion effect, and the permeation of CTUM is at least 10 times higher than conventional separation membranes. Meanwhile, the CTUM is durable under mechanical friction and during filtration. Our work represent a reliable way to make durable MOF membranes for ultra-high permeation organic solvent filtration, which lay a foundation for further exploration of high performance separating membranes.
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MATERIALS RESEARCH BULLETIN
·
2017
·
IF 2.446
Aisheng Huang,Linlin Wan,Jürgen Caro
In a detailed study, the influence of microwave irradiation, synthesis time and temperature, addition of acetic acid (HAc) as a modulator on the morphology, crystallinity and stability of UiO-66-NH 2 is investigated to develop a reliable and reproducible strategy for the preparation of well-shaped UiO-66-NH 2 . The UiO-66-NH 2 were characterized by powder X-ray diffraction (PXRD), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), and gas adsorption. It is found that well-shaped UiO-66-NH 2 with a high CO 2 adsorption capacity can be synthesized in a short time by microwave heating. The UiO-66-NH 2 crystals synthesized by microwave heating are of high quality and show a superior CO 2 adsorption capacity (5.8 mmol/g at 273k and 1 bar) due to the strong interactions between the −NH 2 group and CO 2 . The CO 2 /N 2 selectivity of the obtained UiO-66-NH 2 at 298 K and 1 bar is 66, which is much higher than that of the pristine UiO-66 of 17.8.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Pengfei Zhu,Shuang Qin,Mengrong Geng,Heyang Cao,Zhiliang Jin,Chuanyi Wang
Photocatalytic NO removal technology is considered as one of the most effective green methods for reducing atmospheric NO but there remains the problems of lower efficiency and poor stability of photocatalysts . Rapid recombination of photogenerated electron (e − ) and holes (h + ) is known as a key issue that causes low activity and poor stability of catalysts. Herein, we report a novel AgCu@UiO-66-NH 2 photocatalyst (AgCu@UN) that is made up of AgCu alloy on the surface of Zr-MOF (UiO-66-NH 2 ) by employing in-situ photodeposition method. The experimental results of photocatalytic NO removal indicated that the optimized 0.5Ag0.5Cu@UN sample with 0.5 mg of Ag and Cu exhibited the best NO removal efficiency of 63 % for ppb-level atmospheric NO, more higher than that of pure UiO-66-NH 2 (38 %). The characterizations suggested that the excellent photocatalytic performance of 0.5Ag0.5Cu@UN can be ascribed to the efficient charge separation and transfer and the visible-light-harvesting ability due to benefiting electron migration process between AgCu alloys and UN. Moreover, the enriched electrons around AgCu could be transferred to O 2 to generate more superoxide radicals (•O 2 − ), which could oxidize NO to the final product, nitrate (NO 3 − ). The present findings can provide some novel insights for the design of efficient MOF based photocatalysts to eliminate low concentrations of NO X .
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高影响因子
PROGRESS IN ORGANIC COATINGS
·
2024
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IF 6.5
Jiaxuan Zhou,Zhitao Wang,Ran Liu,Kai Qi,Yubing Qiu,Xingpeng Guo
Fabricating metal-organic frameworks (MOFs) membranes directly onto metal surfaces as anticorrosive coatings is a feasible approach for the application of MOFs in corrosion protection . The MOFs membranes with specific organic groups can be further customized as versatile platforms for developing various functional coatings. Herein, UiO-66 and UiO-66-NH 2 membranes are synthesized onto aluminum surfaces through a polydopamine-assisted method, which are then grafted with superhydrophobic molecules of perfluorodecyltriethoxysilane (PFDTES). The -COOH groups in UiO-66 and -COOH/-NH 2 groups in UiO-66-NH 2 can serve as firm anchor sites for covalently grafting with PFDTES, enabling robust superhydrophobicity of the as-prepared coatings. The superhydrophobic surfaces exhibit water repellency (water contact angle of ∼165 o ), chemical (pH and salinity) and wear-resisting robustness, and long-term service durability. They also perform decent anti-fouling, self-cleaning, and anti-icing properties. Notably, sustainable corrosion protection can be provided by both coatings during immersion in saline solution (3.5 wt% NaCl) for one month and during a two-week salt spray test. Compared with UiO-66, the -NH 2 groups on UiO-66-NH 2 as extra grafting sites for firmer immobilization of more PFDTES molecules facilitate more durable superhydrophobicity and corrosion protection. We believe that this work could offer valuable insights into the multi-functional development of MOFs membranes-based coatings.
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Materials
·
2021
·Vol. 14
·期 9
·2419
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IF 3.623
Mingfei Chen,Yingxue Tu,Songhai Wu
There is an urgent need to develop catalytic degradation technologies for chemical warfare agents (CWAs) that are environmentally friendly and do not require secondary treatment. UiO-66-NH2and other metal–organic frameworks (MOFs) based on zirconium have been shown to promote the catalytic degradation of CWAs. At the same time, MOFs have been studied, and they have shown interesting properties in CWA removal because of their ultrahigh surface area, tunable structures, and periodically distributed abundant catalytic sites. However, MOFs synthesized by conventional methods are mostly powdery crystals that are difficult to process and have poor mechanical stability, which largely limit the development of MOFs in practical applications. An emerging trend in MOF research is hybridization with flexible materials. Polymers possess a variety of unique attributes, such as flexibility, thermal and chemical stability, and process ability, and these properties can be combined with MOFs to make a low-cost and versatile material that also provides convenience for the subsequent integration of such MOFs into independent substrates or textiles. In this article, we used a green and simple method to coat the surface of UiO-66-NH2with polydopamine (PDA), PDA can promote the catalytic hydrolysis of UiO-66-NH2to DMNP (a simulant of chemical warfare agents). Additionally, it can adsorb the toxic hydrolysis product p-nitrophenol, avoiding the trouble of secondary treatment. The half-life of UiO-66-NH2coated with polydopamine (UiO-66-NH2@PDA) for catalytic hydrolysis is 8.9 min, and that of pure UiO-66-NH2is 20 min. We speculate that the surface coated with PDA can improve the diffusion of DMNP to the active sites of UiO-66-NH2.
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高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Jialin Niu,Yulong Xiang,Xiaoli Dong,Yu Wang,Nan Zheng,Pei Yu
Hexavalent chromium in industrial wastewater poses a serious threat to ecosystems. Photocatalytic technology has been seen as a promising strategy for removing heavy metal ions. Construction of heterostructures offered a promising strategy to enhance the separation efficiency of photogenerated carriers, thereby improving photocatalytic performance. Herein, ZnWO 4 /UiO-66-NH 2 heterostructures were synthesized by a two-step hydrothermal method. The synthesized samples were systematically characterized via a variety of techniques, alongside an exploration of the associated photocatalytic mechanism. ZnWO 4 /UiO-66-NH 2 -2 exhibited an exceptional photocatalytic performance, attaining a 97 % degradation of hexavalent chromium within 60 min, approximately 1.3 and 4.7 times that of UiO-66-NH 2 and ZnWO 4 , respectively. The transient photocurrent response, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) results indicate that constructing heterostructures can effectively accelerate the migration of electrons while simultaneously suppressing the recombination process of photogenerated carriers. In addition, Active species trapping experiments revealed that the photogenerated electrons were the main active substances in photoreduction reaction. This study offers an effective strategy for photocatalytic reduction of hexavalent chromium.
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Russian Journal of Physical Chemistry A
·
2026
·Vol. 100
·期 10
·2542-2555
·
IF 0.7
Lili Li,Li Jiaxin,Ma Yuyu,Shu Jing
The Ce-UiO-66-NH 2 material was successfully prepared by oil bath method, and TiO 2 and PANI were compounded on the basis of it, which improved the degradation efficiency of rhodamine B (RhB). XRD, TEM, and XPS characterization confirmed that the composite material formed a core-shell structure and polyaniline was uniformly coated. The composite with 20 μL aniline and CTAB surfactant showed the highest degradation efficiency, and the degradation rate of RhB reached 99.90% within 60 min under ultraviolet light irradiation. The band alignment and free radical trapping experiments show that it follows the ternary Z-type heterojunction mechanism, \( \bullet {\kern 1pt} {\text{O}}_{2}^{ - }\) is the main active species. It provides a new idea for the design of high-performance photocatalysts and is of great significance for promoting the application of photocatalytic technology in water pollution control.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Qianwen Wang,Mengjie Li,Dandan Zhang,Mingmin Jia,Xiong-Fei Zhang,Jianfeng Yao
A mixed-matrix membrane was developed by combining defect-engineered UiO-66-NH 2 metal-organic framework (MOF) and nanocellulose. A formic acid-modulated solvothermal method creates linker-missing defects in UiO-66-NH 2 , increasing its specific surface area from 540 to 775 m 2 g −1 . The hydroxyl/carboxyl-rich cellulose forms a robust hydrogen-bonding network with amino groups and defect sites on the MOF, suppressing interfacial defects. The optimized membrane achieves a CO 2 permeability of 303.7 Barrer with CO 2 /N 2 and CO 2 /CH 4 selectivities of 92.3 and 124.0, respectively. This enhancement arises from optimized adsorption sites in the defective MOF and superb MOF-cellulose interface capability coupled with efficient CO 2 transfer through the cellulose network. Moreover, the membrane exhibits good stability over 500 h tests, offering a promising approach to high-performance gas separation.
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GREEN CHEMISTRY
·
2025
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IF 9.2
Xiaoyang Sun,Linyu Nian,Huimin Qi,Mengjun Wang,Dechun Huang,Chongjiang Cao
Biomimetic mineralization is a crucial biotechnology for encapsulating enzymes within metal–organic frameworks (MOFs). While this technique is extensively employed in solvent-based systems, its applicability in mechanochemical systems remains to be explored. In addition, the structural units of MOF composition may significantly influence this process. In this study, we reported that dodecanuclear zirconium clusters act as precursors to facilitate the mechanochemical process of biomimetic mineralization, leading to the construction of cellulase@UiO-66-NH2 (with cellulase abbreviated as Cel). The results demonstrate that dodecanuclear zirconium clusters promote the biomimetic mineralization of Cel@UiO-66-NH2, preventing enzyme degradation by organic solvents. This approach leads to a 20% increase in enzyme activity per unit mass and a 78% improvement in the encapsulation rate. It also enhances catalytic efficiency and substrate affinity compared with Cel@UiO-66-NH2 synthesized with hexanuclear zirconium clusters. The biomimetic mineralization was attributed to the increased local concentration of structural units of MOFs surrounding Cel, as well as transformations in chemical bonding and alterations in enzyme structure. We demonstrated the stability of Cel@UiO-66-NH2 compared to traditional physical adsorption methods and explored its applications in the saccharification of carboxymethylcellulose and microcrystalline cellulose and the high-temperature sequential extraction of polysaccharides from Naematelia aurantialba. Our results revealed that Cel@UiO-66-NH2 retained over 50% of its catalytic activity after eight cycles of carboxymethylcellulose saccharification and maintained 50.9% enzyme activity after five cycles of treatment with microcrystalline cellulose. In addition, we achieved a polysaccharide extraction yield of 10.35% at 70 °C.
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ENVIRONMENTAL TECHNOLOGY
·
2022
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IF 3.475
Tong Li,Caixia Cheng,Kaifeng Zhang,Jie Yang,Guangshuo Han,Xiuju Wang,Zhongpeng Wang,Liguo Wang
In this paper, the hydrophilic UiO-66-NH2 nanomaterial was synthesized by the solvent-thermal method and characterized. Then, UiO-66-NH2 was introduced into the casting membrane solution of cellulose acetate (CA) forward osmosis (FO) membrane, and CA/UiO-66-NH2 forward osmosis membrane was prepared by the phase inversion method. The optimum preparation conditions of CA/UiO-66-NH2 mixed matrix membranes were determined as follows: the content of UiO-66-NH2 was 0.4 wt%, the coagulation bath temperature was 35°C, the mixing temperature was 50°C and the heat treatment temperature was 50°C. FTIR, SEM, water contact angle and AFM were carried out on CA/UiO-66-NH2 forward osmosis membrane prepared under the best preparation conditions. Compared to the CA forward osmosis membrane, the permeability and selectivity of the CA/UiO-66-NH2 membrane were improved. The water flux and reverse salt flux of the CA/UiO-66-NH2 forward osmosis membrane reached 52.32 L/(m2·h) and 2.43 g/(m2·h), respectively. The permeability selectivity of CA membranes and CA/UiO-66-NH2 membranes did not change much during 180 min, indicating that the two membranes had good long-term stability. This study shows a potential advantage of UiO-66-NH2 as additives for improvement in the desalination performance of forward osmosis membranes.
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PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 33
·e52810
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IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Rui Duan,Hongjuan Wu,Jiahe Li,Zhaoxi Zhou,Weihua Meng,Lei Liu,Hongqiang Qu,Jianzhong Xu
Phosphor nitrile functionalized UiO-66-NH 2 /graphene (G-U-H) was prepared combined a green mechanochemical method and microwave-assisted rapid method to improve the fire safety of epoxy resin (EP). The scanning electronic microscopy, transmission electron microscope and X-ray diffraction results indicated that the G-U-H exhibited sandwich-like hybrid structure. And the -OH from graphene nanoplatelets and -NH 2 from UiO-66-NH 2 were grafted with hexachlorocyclotriphosphazene to form covalent bonds . The obtained flame retardant was added to the EP at a different content. The flame retardancy index and cure index of EP composites were calculated, and those of EP-3 were both good. The cone calorimetry test showed that the flame retardancy of EP was improved and the flame retardant mechanism is the combination of condensed phase and gas phase with the synergistic of P, N and other elements. The physical barrier of graphene nanoplatelets and the generated more stable and denser residual char in condensed phase can effectively cut off the heat and mass transmission. In gas phase, the non-flammable gases were generated to help reduce the heat released.
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