CHEMICAL ENGINEERING RESEARCH & DESIGN
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2019
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IF 3.073
Kai Wang,Yun Qin,Shuai Quan,Yingjie Zhang,Peng Wang,Heng Liang,Jun Ma,Xi Quan Cheng
With suitable pore size, narrow pore size distribution and charged surface, nanofiltration (NF) membranes show great potential in removing or recovering dyes from effluents of printing and dyeing industries. However, low permeance of commercial nanofiltration membranes hampers their widespread application. Herein, we design a kind of high permeance mixed matrix membranes through layer-by-layer (LbL) self-assembly of polyelectrolytes (PEs). The additional solvent pathways constructed by incorporation of UiO-66, a type of Zr-based metal organic frameworks (MOFs), accelerate the water passing through the membranes; the pure water permeance of UiO-66 incorporated PEs membrane (PEM/UiO-66) achieves at as high as 14.8 L m −2 h −1 bar −1 which is 160% higher than the pristine PEs membrane. Meanwhile, the membrane exhibits 96.3% rejection towards MgSO 4 with molecular weight cut off (MWCO) of 464.2 g mol −1 . The comprehensive separation performance of the mixed matrix membrane outperforms most of state-of-the-art NF membranes fabricated by LbL self-assembly to the best of our knowledge. Most interestingly, the mixed matrix membrane demonstrates solution flux as high as 102 L m −2 h −1 with 99.9% rejection of Congo Red under optimized operation conditions in 240 h continuous operation. Taken together, the UiO-66 incorporated NF membranes show strong promise in removing and recovery of dyes in industrial scale.
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CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Shuting Zhuang,Rong Cheng,Jianlong Wang
UiO-66 type metal organic frameworks (MOFs), including UiO-66 and UiO-66-NH 2 , were synthesized, characterized, and applied for the adsorptive removal of diclofenac (DCF) from aqueous solutions. The effect of synthetic conditions (e.g., different linkers and activation temperatures) and adsorptive conditions (e.g., contact time, initial concentration, temperature, and pH) on DCF removal was examined. UiO-66-NH 2 showed a higher adsorption capacity than UiO-66, and the increase of activation temperature can improve the adsorption capacity of UiO-66-NH 2 towards DCF. The adsorption of DCF by UiO-66-NH 2 was endothermic and almost not affected by pH in the range of 4.8–7.7. The adsorption of DCF onto UiO-66 type MOFs conformed to the pseud second-order kinetic model and the Langmuir isothermal model, with adsorption capacity of 357 mg g −1 for UiO-66 and 555 mg g −1 for UiO-66-NH 2 . Electrostatic interaction and H-bonding possibly played a vital role for DCF adsorption. The as-prepared UiO-66 type MOFs were efficient adsorbent for DCF removal from aqueous solution.
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JOURNAL OF MEMBRANE SCIENCE
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2018
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IF 6.578
Xiong-Fei Zhang,Yi Feng,Zhongguo Wang,Mingmin Jia,Jianfeng Yao
Incorporating metal-organic frameworks into cellulose matrix to prepare composite membranes is promising in gas-separation applications. In this study, UiO-66-NH 2 (Zr-based MOF) nanoparticles are wrapped into the densely packed cellulose nanofibrils (CNF-COOH) via a facile vacuum filtration process. The existence of acid-base interactions and electrostatic forces between UiO-66-NH 2 and CNF-COOH renders ideal interfacial morphology. Results show that UiO-66-NH 2 is cross-linked by -COOH groups and well-dispersed in the CNF matrix. The porous UiO-66-NH 2 strengthens the diffusion process of CO 2 molecules, thus elevating the permeation flux and separation factor simultaneously. The optimum separation performance is achieved over CM-1 membrane with a CO 2 permeability of 139 Barrer and a CO 2 /N 2 selectivity ratio of 46.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Xiaoyao Wang,Haizhi Huang,Siyao Zhong,Xuping Shentu,Zihong Ye,Xiaoping Yu
Fenpropathrin residues in grain are potentially harmful to humans. Therefore, a fluorimetric lateral flow immunoassay using a zirconium-based organic skeleton (UiO-66) as a signal marker was developed for detecting fenpropathrin. Herein, carboxymethyl chitosan (CMCS) was used to modify UiO-66 and improve its water solubility to facilitate stable binding with sodium fluorescein (NaFL). This resulted in formation of a new fluorescent probe that is more suitable for lateral flow immunoassay (LFIA). The materials were characterized via electron microscopy , Fourier-transform infrared spectroscopy, and powder X-ray diffraction. CMCS and NaFL were successfully bound to UiO-66. Under optimized conditions, the constructed NaFL/UiO-66@CMCS-LFIA exhibited a good linear relationship within the range of 0.98–62.5 μg/L, with a detection limit of 3.91 μg/L. This probe was fourfold more sensitive than traditional colloidal gold nanoparticle-based LFIA. Finally, NaFL/UiO-66@CMCS-LFIA was successfully applied to detect fenpropathrin in wheat and maize samples. The detection limit was 1.56 μg/kg and recoveries ranged from 96.58 % to 118.56 %. This study provides a sensitive, stable, and convenient method for the rapid detection of pesticide residues .
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PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 7
·1487
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IF 4.6
Senliang Xi,Dawei Xu,Renzeng Chen,Wenhao Yao,Wenying Wu,Teng Zhang,Liang Yu
Ammonia borane (AB) has attracted much attention in the field of solid-state hydrogen storage due to its high hydrogen storage capacity. Nanoconfinement in UiO-66 can reduce the hydrogen release temperature. In particular, terephthalic acid was used as a linker to further improve the dehydrogenation properties through the modification of -NH2, -OH, -NO2, -Br, and -F groups. The hydrogen release content of 0.5AB/UiO-66 was 1.98 wt.%, whereas the hydrogen release content of UiO-66-2OH modified by -OH groups increased to 3.85 wt.%. The non-covalent interaction results show that -NH2and -OH preferred adsorption with -BH3, and the H in -NH2and -OH were able to interact directly with the H in AB to modify the dehydrogenation process of AB, whereas -NO2, -Br, and -F indirectly affected the charge density of hydrogen atoms in AB to alter the dehydrogenation property of AB. The modification of functional groups provides a theoretical basis for the design of high-performance MOF nanoconfinement AB composite hydrogen storage materials.
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DALTON TRANSACTIONS
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2024
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IF 3.5
Zhengyan Wang,Chenhao Yuan,Dong Yang,Mifen Cui,Jihai Tang,Zhuxiu Zhang,Xu Qiao
It is of great significance to develop catalysts for the degradation of hexachlorobenzene from the industrial thermal process. In this paper, formic acid was used as a modulator to generate defect sites in Ce/Zr-UiO-66 with intrinsic Brønsted acidity. The defective formate ligands were removed through methanol–water vapor treatment to expose additional open metal sites with Lewis acidity. The intrinsic Brønsted acid sites of the resulting Ce/Zr-UiO-66-FA-P achieved a hexachlorobenzene degradation efficiency of 99.5% at 250 °C. The generated Lewis acid sites facilitated the C–C cleavage of degradation intermediates. More than 95.0% of the final products were CO2/CO, coupled with chlorinated alkanes/alkenes, which outperformed other benchmark metal oxide catalysts. The Ce/Zr-UiO-66-FA-P catalyst maintained its catalytic activity in the model industrial flue gas and humid environment. The degradation pathway of hexachlorobenzene was tracked using in situ FT-IR spectra.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Z.H.A.O.-X.U.A.N. Jiang
In this investigation, UiO-66-NH 2 was effectively synthesized through a solvothermal approach, utilizing benzoic acid and hydrochloric acid (HCl) as modulating agents. This synthesis process intentionally introduced defects mediated by benzoic acid, and the degree of these defects was precisely adjusted by the concentration of HCl. Subsequently, the material underwent a covalent modification process through an amidation reaction, resulting in the attachment of tetrakis (4-carboxyphenyl) porphyrin (TCPP). The results demonstrated a significant improvement in the photocatalytic reduction of Cr(VI), showcasing a 125 % elevation in reduction efficiency as compared to the unmodified UiO-66-NH 2 material serving as the baseline. The performance enhancement is due to the synergistic effect of the defect structure and TCPP modification, which enhances the light absorption, promotes charge transfer and separation, reduces the recombination rate, and improves the adsorption capacity and light absorption efficiency of Cr(VI). This research introduces an innovative approach and a highly effective catalyst, offering a novel solution for modifying metal-organic frameworks (MOFs) and enhancing their photocatalytic performance in the reduction of Cr(VI).
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FOOD CHEMISTRY
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2024
·
IF 8.5
Qiyue Zhao,Hong-Man Hou,Gong-Liang Zhang,Hongshun Hao,Bei-wei Zhu,Jingran Bi
Heterocyclic aromatic amines (HAAs), arising as chemical derivatives during the high-temperature culinary treatment of proteinaceous comestibles, exhibit notable carcinogenic potential. In this paper, a composite aerogel (AG D-UiO-66 ) with high-capacity and fast adsorption of HAAs was made with anchoring defective UiO-66 (D-UiO-66) mediated by lauric acid on the backbone of cellulose nanofibers (CNF). AG D-UiO-66 with hierarchical porosity reduced the mass transfer efficiency for the adsorption of HAAs and achieved high adsorption amount (0.84–1.05 μmol/g) and fast adsorption (15 min). The isothermal adsorption model demonstrated that AG D-UiO-66 belonged to a multilayer adsorption mechanism for HAAs. Furthermore, AG D-UiO-66 was successfully used to adsorb 12 HAAs in different food (roasted beef, roasted pork, roasted salmon and marinade) with high recoveries of 94.65%–104.43%. The intrinsic potential of AG D-UiO-66 demonstrated that it could be widely applicable to the adsorption of HAAs in foods.
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高影响因子
FUEL
·
2017
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IF 4.601
Xiaotian Zhang,Pengcheng Huang,Aili Liu,Mingyuan Zhu
Owing to the high prices and other shortcomings associated with the existing methods of complex catalyst preparation, we used the UIO-66(Zr) metal–organic frameworks to directly catalyze the oxidative desulfurization (ODS) reaction. The synthesized UIO-66(Zr) was characterized using nitrogen adsorption–desorption isotherm analysis, X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Under optimal reaction conditions, the ODS conversion of dibenzothiophene (DBT) reached 100%. This excellent catalytic activity was attributed to the unsaturated coordination of Zr, which may produce beneficial Lewis acid sites.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yuchen Cui,Xiaolei Cui,Lubomira Tosheva,Chunzheng Wang,Yongming Chai,Zixi Kang,Qiang Gao,Kun Wang,Zhihan Zhang,Hailing Guo,Daohong Xia,Daofeng Sun
Effective separation of CO 2 from CH 4 is crucial for the purification of natural gas, which requires membrane materials with high permeability, selectivity, and stability of under high pressures. In this work, a high CO 2 -affinity MOF-based nanofiller (P in @NH 2 -UiO-66) was prepared and integrated in polyetherimide (PEI) to prepare mixed matrix membranes (MMMs) for enhanced CO 2 /CH 4 separation capabilities. The P in @NH 2 -UiO-66 nanofiller comprised an in situ-formed polyethyleneimine-NH 2 -UiO-66 composite prepared via a one-pot synthesis. The polyethyleneimine was covalently attached to the H 2 BDC-NH 2 ligand allowing for a stronger integration within the PEI matrix. The polyethyleneimine affects the nucleation of MOF, leading to miniaturization of the MOF particles. The smaller-sized filler is beneficial for improved interaction at the filler-matrix interface. The numerous amino functionalities grafted onto the NH 2 -UiO-66 increased the CO 2 adsorption sites, thereby enhancing the affinity for CO 2 . Owing to the improved interaction, the elevated CO 2 attraction, and the inherent properties of the porous NH 2 -UiO-66, the fabricated MMMs preformed superior in separating CO 2 /CH 4 . The 30-P in @NH 2 -UiO-66-PEI membrane (containing 30 wt% nanofiller) exhibited a CO 2 /CH 4 selectivity of 27.7 and a CO 2 permeability of 2498.9 Barrer. The CO 2 permeability was 21 times greater than that of the pristine PEI membrane, and 4 times higher compared to P@NH 2 -UiO-66 MMM with polyethyleneimine modified MOF filler prepared by a traditional wet impregnation method. Additionally, the novel MMM demonstrates excellent separation stability under conditions that mimic industrial settings, demonstrating its potential application for natural gas purification.
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RARE METALS
·
2024
·
IF 9.6
Liu Cheng,Shi Ying-Zhang,Chen Qi,Ye Bing-Hua,Bi Jin-Hong,Yu Jimmy C.,Wu Ling
Defect engineering in metal organic frameworks (MOFs) has captured significant attention in the field of photocatalysis. A series of UiO-66(Ce) (UiO = University of Oslo) MOFs with different contents of missing-linker defects have been developed for the photocatalytic selective oxidation of benzylamine (BA) and thioanisole (TA) under visible light. The introduction of missing-linker defects promotes the formation of unsaturated Ce sites with a high Ce 3+ content. It also generates a high concentration of oxygen vacancies. In situ Fourier transform infrared spectroscopy (FTIR) results revealed that BA and TA molecules were activated on coordinatively unsaturated Ce sites via the H–N···Ce and the C–S···Ce interactions, respectively. Simulated in situ electron paramagnetic resonance (EPR) data indicate that O 2 activation and reduction occur at coordinatively unsaturated Ce 3+ sites to form ·O 2 – . This is accelerated by the Ce 3+ /Ce 4+ redox cycle associated with the photogenerated electrons. The corresponding photogenerated holes are involved in the deprotonation of the activated BA and TA. The most active sample exhibits 98.4% and 95.5% conversion rates for BA and TA oxidation. Mechanisms for the molecular activation are proposed at the molecular level. Graphical abstract
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Zimu Liu,Mingtai Li,Zitong Zhao,Yulong Yang,Linlin Deng,Baojuan Dou,Feng Bin
In recent years, the adsorption and separation of ammonia (NH 3 ) from airflow have attracted growing attention. However, there is a need to further enhance the adsorption capacity of adsorbents. In this study, the amino-functionalization of UiO-66 was investigated to evaluate its dynamic NH 3 adsorption performance by varying the type and proportion of organic ligands. It was observed that the introduction of amino groups significantly enhanced the ammonia adsorption capacity by 78.5 %, despite a minor reduction in specific surface area and pore size. Combined with the results of density functional theory and in-situ infrared, the enhanced adsorption ability can be ascribed to the functionalization increasing the polarity within the pore, thereby strengthening interactions with ammonia molecules through weak hydrogen bonding.
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