Nanoscale
·
2025
·
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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
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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Desalination and Water Treatment
·
2024
·
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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CRYSTENGCOMM
·
2024
·
IF 2.6
Hao He,Xiao-kai Liu,Bai-yun Zhao,Li-juan Zhou,Xuan Zhao,Chen-xu Wang,Ji-yuan Zhang,Yuan-fang Zhang,Li Wang
In this study, UiO-66-NH2 nanoparticles were synthesized via a hydrothermal method, using acetic acid and hydrochloric acid as modulators to optimize the specific surface area and pore width. Oxytetracycline (OTC) was chosen as the test compound to evaluate the adsorption efficiency of UiO-66-NH2.The material was thoroughly characterized under varying conditions, and the adsorption mechanism was systematically explored through adsorption kinetics, isotherms, and thermodynamic analyses. The results demonstrated that UiO-66-NH2 exhibited a high OTC adsorption capacity, achieving a maximum of 312.5 mg g−1 under optimal conditions. XRD, TGA, and BET analyses revealed that acetic acid and hydrochloric acid significantly improved the crystallinity and thermal stability of UiO-66-NH2, increasing the specific surface area from 8.023 m2 g−1 to 998.663 m2 g−1 and reducing the pore width from 18.783 nm to 2.129 nm. FTIR, XPS, adsorption kinetics, and isotherm studies indicated that the main forces driving OTC adsorption by CMC-Fe were hydrogen bonding, π–π stacking, weak electrostatic interactions, and pore filling. Cyclic adsorption experiments further demonstrated the excellent reusability of UiO-66-NH2. In summary, the use of acetic acid and hydrochloric acid significantly increased the specific surface area of UiO-66-NH2, exposing more adsorption sites and playing a critical role in pollutant removal.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Yanbing Yin,Yang Liu,Zhaosong Xin,Guopeng Xu,Yongming Feng,Bei Jiang,Xifeng He,Hongbo Zhang,Jie Ma
A new type aminophthalocyanine was synthesized and loaded on MOFs material UiO-66-NH 2 by impregnation method to synthesize a new type binary composite catalyst AmCoPc/UiO-66-NH 2 . It was systematically characterized by X-ray powder diffraction (XRD), Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), Scanning electron microscopy (SEM) and N 2 adsorption desorption. The synthesized catalyst was applied to the photocatalytic degradation of methylene blue dye under visible light. Compared with AmCoPc or UiO-66-NH 2 monomer performance, the synthesized AmCoPc/UiO-66-NH 2 composite significantly enhanced the degradation of methylene blue (MB), the best degradation efficiency was 90.32%. The reason is that the synergistic effect of AmCoPc and UiO-66-NH 2 effectively improves the light utilization efficiency. The desirable properties such as the positive catalytic activity of the central ion and the high specific surface area of the composites accelerate charge transport and reduce charge recombination.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ming Cao,Fan Xiao,Zijian Yang,Yingbo Chen,Ligang Lin
Oil-containing emulsion pollution seriously endangers the ecological environment and human health, and it is urgent to solve the problem of oil-containing emulsion pollution. In membrane separation technology, metal organic frameworks (MOFs) are being widely used to enhance the wettability of the membrane surface and separation efficiency. Here, electrospinning technics and the outstanding wetting properties of MOF are combined to improve the separation performance of oil-containing emulsions. PVP chains were successfully grafted on Zr-O clusters of UiO-66-NH 2 to prepare PVP-UiO-66-NH 2 nanoparticles, which were then loaded on the PAN nanofiber substrate with microspheres/fine fibers prepared by a continuous electrospinning-electrospray process. The result shows that the PAN nanofiber substrate loaded with 0.5 wt% PVP-UiO-66-NH 2 has the best separation efficiency and stable anti-fouling ability for different kinds of oil-in-water surfactant stabilized emulsions (TOC = 11.6 mg/L, R = 99.2% FRR = 94.4% for n-hexane-water emulsion). Therefore, the constructed nanofiber membrane is the favorable candidate for the efficient separation of oil-containing emulsions.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1839-1849
·
IF 3.146
Zhang Xiaoting,Zhang Shusheng,Ouyang Gangfeng,Han Runping
A zirconium-based metal organic framework (UiO-66-NH 2 ) was prepared using a greener approach for the removal of hexavalent chromium (Cr(VI)) from solution. The characterization of UiO-66-NH 2 was performed using several methods, and the influence of the solution pH, adsorbent dosage, salt, adsorption time, Cr(VI) concentration and adsorption temperature on adsorption quantity was performed in batch mode. UiO-66-NH 2 can efficiently remove Cr(VI) through the synergistic effect of adsorption and reduction. At pH solution of 1.1 and solid-to-liquid ratio of 2 g·L −1 , the removal rate of 100 mg·L −1 Cr(VI) increased to 95.2%. The maximum adsorption capacity of UiO-66-NH 2 from Langmuir model was 252 mg·g −1 . The adsorption equilibrium process can be well described by Langmuir, Koble-Corrigan and Temkin models, while the kinetic process can be predicted by pseudo-second-order and Elovich model. UiO-66-NH 2 showed a good adsorption capacity in a wide range of pH (pH=1.1–10) and also had better regeneration performance after five cycles using 0.01 mol·L −1 NaOH; consequently, it can be a promising adsorbent for the removal of Cr(VI) from solution.
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Biosensors-Basel
·
2024
·Vol. 14
·期 10
·512
·
IF 4.9
Jiawen Fan,Junjie Qi,Jingkun Li,Fuwei Pi
Arginine has been widely applied in the food industry as coloring agents, flavoring agents, and nutritional fortifiers. It is also one of the major components of feed additives. Currently, methods for the highly selective detection of arginine remain absent. For accurate and sensitive detection of L−arginine, a novel ratiometric fluorescence assay based on Ru@UiO-66-NH2was developed and demonstrated in this study. Under optimized detection conditions, the limit of detection (LOD) of this assay for L-arginine was 2.32 μM, which is superior to most assays reported to date. Meanwhile, Ru@UiO-66-NH2showed good stability within 30 days, demonstrating the wide applicability of the proposed assay. The spike-and-recovery rates of the proposed assay for L-arginine in real samples (e.g., tea, grape juice, and serum) were 84.27–113.09%. Overall, the proposed assay showed high sensitivity, good reproducibility, and excellent stability in the detection of L-arginine in both buffer and real samples.
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LANGMUIR
·
2024
·
IF 3.7
Ding Wang,Xiaohua Jia,Zhiqiang Shan,Li Gao,Jin Yang,Zhaofeng Wang,Haojie Song
Fluorinated graphene (FG) among numerous two-dimensional materials has enormous potential in improving antifriction properties. However, they being susceptible to thermal oxidation and prone to wear hinder practical applications. Herein, UIO-66-NH2 (Zr-MOF) enjoying good chemical and thermal stabilities was assembled on the surface of FG nanosheets under covalent bonds and van der Waals forces. The Zr-MOF@FG composite was successfully synthesized and used as a lubricant additive. It can be seen that Zr-MOF@FG composites offer a synergistic lubricant mechanism at the friction interface. Moreover, due to the adsorption and purification performance of Zr-MOF, the obtained Zr-MOF@FG composite adsorbs the abrasive rust during the friction process, thereby realizing the purification of the lubricant. These findings suggest that Zr-MOF@FG shows tremendous potential as a lubricant additive.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 8
·3573-3580
·
IF 2.7
Ruidong Li,Bo Zhao,Ganggang Chang,Shanchao Ke,Minjie Chen,Didi Dong,Chun Pu,Xiaoyu Yang
In the current investigation, the base-metal hollow multifunctional catalyst, Pd–IL@H-UiO-66-NH2, was fabricated utilizing a hydrothermal method followed by etching and supporting processes. The results of the effort demonstrate that Pd–IL@H-UiO-66-NH2 displays significantly enhanced activity and product selectivity in catalysis of the one-pot Knoevenagel condensation–hydrogenation reaction, as well as a high level of generality in promoting hydrogenation reactions of unsaturated hydrocarbons. The excellent properties of Pd–IL@H-UiO-66-NH2 are ascribed to its rationally designed spatial distribution of catalytically active sites within its hierarchical structure, which is comprised of surface wrinkles that increase hydrophobicity and exposure of the active sites, and hollow structures that serve as nanoreactors to enrich substrate interactions and improve mass transfer. Furthermore, the catalytic stability of Pd–IL@H-UiO-66-NH2 was shown to be largely maintained after its use in five successive catalytic cycles. The stability of the new tandem catalyst benefits from strong confinement effects associated with its hollow structure and electronic interactions between the Pd and ILs that effectively restrict leaching and aggregation of Pd nanoparticles (NPs).
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tiantian Wang,Lingfeng Zhao,Guanhua Liu,Xiaoyang Yue,Xiaobing Zheng,Li Ma,Yunting Liu,Mimi Chen,Yanjun Jiang
The concentration of micropollutants (MPs) in water is low, but they are highly harmful and difficult to remove. Biocatalytic membrane combines membrane separation and enzyme catalysis thus being efficient. Herein, a sulfonated covalent organic framework (SCOF) was grown in situ on the surface of a hydrolyzed polyacrylonitrile (HPAN) membrane coated with a polydopamine (PDA) layer to provide a defect-free substrate layer for the pressure-assisted self-assembly of rigid UiO-66-NH 2 nanoparticles and organic laccase with electrostatic attraction. In the obtained multilayer loose biocatalytic membrane, UiO-66-NH 2 nanoparticles can provide trans -membrane mass transfer channels for water molecules and intercept pollutants, and laccase can degrade MPs and eliminate defects among UiO-66-NH 2 nanoparticles. By optimizing the membrane preparation conditions, the biocatalytic membrane has a bisphenol A (BPA) removal rate of 96.9%. The removal rate of dyes can reach more than 98% with a pure water permeance of 211.3 LMH/bar, and the generally < 20% salt removal efficiency endows the membrane with good dye/salt separation ability. At the same time, the membrane has BPA removal rate of over 80% under pH of 4 ∼ 11 and feed BPA concentration of 4–100 mg/L, respectively. The membrane initial activity can maintain more than 90% after 10 days of storage in aqueous solution. After 7 times of reuse, the removal rate of BPA was still more than 60%. Overall, this study opens up a convenient avenue for the facial fabrication of multilayer biocatalytic membranes for efficient MPs removal.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Ziwei Guo,Jingce Bi,Yi Wang,Xiaoguang Sang,Xia Zhang,Zhuopeng Wang,Yide Han
Metal-organic framework materials (MOFs) have shown great promise in electrochemical sensing applications due to their high specific surface area, excellent thermal and chemical stability. However, the practical application of MOFs in non-enzymatic electrochemical glucose sensing is limited by their inherent drawbacks, such as poor electrical conductivity and low mass transfer efficiency. To overcome these challenges, we successfully synthesized a Co@UiO-66-NH 2 /acetylene black (Co@UiO-66-NH 2 /AB) nanocomposite through a dual-solvent method followed by mechanical grinding method and applied it as an efficient electrochemical glucose sensor. Experimental results demonstrate that the Co@UiO-66-NH 2 /AB nanocomposite exhibits significantly enhanced electrochemical sensing performance for glucose detection, compared to pure Co@UiO-66-NH 2 . Specifically, 0.5Co@UiO-66-NH 2 /AB nanocomposite achieves sensitivities of 89.60 μA·mM −1 ·cm −2 and 37.65 μA·mM −1 ·cm −2 in the linear ranges of 0–800 μM and 800–6000 μM, respectively, with a low detection limit of 2.31 μM and a rapid response time of approximately 3.6 s. Additionally, 0.5Co@UiO-66-NH 2 /AB nanocomposite demonstrates remarkable stability, with the current signal remaining nearly constant over an extended period of 3000 s. This enhanced performance can be attributed to the abundant active sites provided by Co@UiO-66-NH 2 , coupled with the enhanced electrical conductivity imparted by acetylene black. Moreover, the sensor exhibits minimal interference from common interfering substances, such as uric acid, dopamine hydrochloride, and ascorbic acid, was observed during glucose detection. Meanwhile, the 0.5Co@UiO-66-NH 2 /AB nanocomposite was also applied for the rapid determination of glucose in bovine serum albumin. Consequently, the Co@UiO-66-NH 2 /AB nanocomposite holds great potential for application in electrochemical biosensors.
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