INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.9
Miao Miao,Xue-Rui Dong,Mei-Lin Chen,Tong-Tong Xu,Zhe Lin,Qiao Gao
Quercetin (Qu), a naturally occurring flavonoid, is critically involved in sustaining human physiological health. Therefore, it is imperative to rationally design a proficient electrochemical sensor capable of sensing Qu. Herein, a ternary nanocomposite composed of Keggin-type polyoxometalate (PMo 12 ), carbon nanotubes (CNTs), and zirconium-based MOF (UiO-66-NH 2 ) was successfully fabricated to develop a sensitive electrochemical sensor for Qu determination. Benefiting from the synergistic integration of diverse components, the high conductivity of CNTs, good electrocatalytic performance of PMo 12 , and favorable adsorption capacity of UiO-66-NH 2 jointly facilitated the adsorption and electron transfer process of Qu at the electrode interface. The constructed sensor showed a broad linear detection range of 10–160 μM, high detection sensitivity reaching 0.226 μA·μM −1 , and a detection limit as low as 0.486 μM (S/N = 3) at the optimized working conditions. Besides, the developed sensor exhibited outstanding selectivity, stability, reproducibility, and repeatability. By determining the Qu content in Flos Sophorae Immaturus samples, we further confirmed the actual application capability of the constructed sensor. Satisfactory recoveries of 97.01%–101.08% were obtained, which strongly validated the reliability and accuracy of the proposed electrode for practical Qu analysis.
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TALANTA
·
2025
·
IF 6.1
Muhammad Hussnain Afzal,Wajeeha Pervaiz,You Xu,Nomair Elahi,Zhuo Huang,Guangfang Li,Hongfang Liu
The widespread use of acetaminophen (AP) has resulted in its frequent presence in pharmaceutical waste, posing ecological and health risks. To address this, a voltametric sensor based on a bimetallic UiO-66-NH 2 metal-organic framework incorporating Zirconium (Zr) and Cerium (Ce) was developed for sensitive AP detection. The incorporation of Ce 3+ not only introduced redox active sites but also reduced the particle size from 495-650 nm in (Zr)UiO-66-NH 2 to 230–365 nm in (Zr/Ce)UiO-66-NH 2 , increasing surface area and enhancing electrocatalytic activity. The combined synergistic effect of Zr and Ce significantly improved charge transfer and enhanced oxidation current response compared to the unmodified GCE. The sensor exhibited excellent electrocatalytic performance with a wide linear range (0.072–680 μM), high sensitivity (0.496 μAμM −1 cm −2 ), and a low limit of detection (0.024 μM). In addition, the sensor exhibited excellent selectivity against interfering species and maintained stable performance over 21 days. The sensor's practical applicability was validated by testing real environmental samples, achieving recovery rates of 97–103 %, and the results were consistent with those obtained using high-performance liquid chromatography (HPLC).
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Catalysts
·
2023
·Vol. 13
·期 5
·876
·
IF 3.9
Huan He,Xusheng Wang,Qin Yu,Wenbin Wu,Xinya Feng,Deyu Kong,Xiaohui Ren,Junkuo Gao
Cr(VI) is one of the most toxic heavy metals, posing multiple threats to humans and ecosystems. Photoreduction of toxic Cr(VI) to para-toxic Cr(III) is one of the most effective ways to remove heavy metal chromium but is still challenging. Herein, Ti3C2/UiO-66-NH2composites with different ratio of Ti3C2were synthesized via an in situ solvothermal process and used for the enhanced photocatalytic removal of Cr(VI) for the first time. The UiO-66-NH2nanoparticles were dispersed on the surface and slits of accordion-like Ti3C2homogeneously. A strong interfacial interaction between Ti3C2and UiO-66-NH2was formed, which was indicated by the XPS. The Fermi level of the MXene cocatalyst is lower than UiO-66-NH2; thus, Ti3C2can serve as the electron sink and accumulate photogenerated electrons from UiO-66-NH2on its surface. A depletion layer was also formed due to the different Fermi levels of UiO-66-NH2and Ti3C2, which prevents electrons from flowing back to UiO-66-NH. The strong interfacial interaction and formed depletion layer are beneficial for the following charge transfer from UiO-66-NH2to Ti3C2after light irradiation and for suppressing the photogenerated charge recombination. With suitable band positions and enhanced charge separation ability, Ti3C2/UiO-66-NH2composites exhibited better photoreduction efficiency of Cr2O72−than pure Ti3C2and UiO-66-NH2, with optimized samples reaching 100% in 40 min. The photoreduction kinetics of Cr2O72−by 2-T/U was also studied, with a photoreduction rate of 0.0871 min−1, which is about 2.6 times higher than that of the pure UiO-66-NH. This research provides a new type of efficient and environmentally friendly photocatalysts for the photoreduction of Cr2O72−.Keywords:metal–organic frameworks;photocatalysis;MXene;Cr(VI);photocatalyst;photoreduction;porous materials
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shenglong Tian,Zede Yi,Junqing Chen,Shiyu Fu
The capture of radioactive iodine is an inevitable requirement in nuclear industry for environmental protection. Metal-organic frameworks (MOFs) are a new generation of sorbents that have wide applications for iodine adsorption and recovery. Although the loading of MOFs on wood can avoid the drawbacks of the powder form of MOFs in implementation, the dense structure of wood results in the lower loading, even after delignification, which limits the adsorption capacity. Herein, a hierarchically porous UiO-66-NH 2 @WCA composite was fabricated by in-situ synthesis of UiO-66-NH 2 in wood-derived cellulose aerogel (WCA) that was further removed hemicellulose from delignified wood. UiO-66-NH 2 @WCA exhibited a high loading (36 wt%) of UiO-66-NH 2 crystals and a high adsorption capacity of 704 mg/g for iodine vapor and 248 mg/g for iodine aqueous solution. The adsorption behavior in iodine aqueous solution was well predicted by the Freundlich isotherm and pseudo-second-order kinetic model. The adsorption capacity of UiO-66-NH 2 @WCA was highest in solution when the pH was 6, while the ionic strength had little effect. The hydroxyl groups on the WCA matrix had a charge transfer effect with iodine, providing additional sites for iodine capture . Furthermore, a packed column system was applied to demonstrate the excellent recyclability and potential for practical application.
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CHEMOSPHERE
·
2022
·
IF 8.943
Bin Zhao,Min Sun,Zhiqiang Guo,Liang Wang,Yiran Qian,Xiaojia He,Jixiang Li
Endocrine disrupting compounds (EDCs) have been increasingly detected in drinking water sources, and pose severe threat to human health. Polyamide (PA) based nanofiltration (NF) membrane has great potential for EDCs removal from water, but the removal of hydrophobic EDCs is not satisfying due to strong hydrophobic affinity. In this study, UiO-66-NH 2 /PA membranes were prepared by predepositing hydrophilic UiO-66-NH 2 onto the substrate prior to interfacial polymerization. The UiO-66-NH 2 aggregates increased the permeable area and strengthened the “gutter effect”. Therefore, the pure water flux of UiO-66-NH 2 /PA increased by 115% compared with that of the thin-film composite (TFC) membrane, and its rejection of Na 2 SO 4 was 96%. The hydrophilicity-enhanced PA film reduced its adsorption of EDCs and decreased the driving force for EDCs diffusion. Moreover, the UiO-66-NH 2 -induced hydrophilic nanochannels, including the interfacial gaps between PA film and UiO-66-NH 2 aggregates, the gaps in UiO-66-NH 2 aggregates, and the inherent pores in UiO-66-NH 2 crystals, alleviated the hydrophobic affinity and effectively restricted EDCs diffusion. The rejection rates of methylparaben, propylparaben, bisphenol A, and benzylparaben by the optimal UiO-66-NH 2 /PA were 50%, 67%, 75%, and 85%, respectively, and the water/benzylparaben selectivity was 4.4 times as high as that of TFC. The results demonstrate that incorporating hydrophilic metal-organic frameworks (MOFs) can improve the membrane hydrophilicity and create hydrophilic nanochannels, and is an effective strategy to enhance EDCs removal by nanofiltration.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 60
·90738-90751
·
IF 5.19
Zhang Xiaoting,Han Runping
In this study, a zirconium elemental organic framework (UiO-66-NH 2 ) was prepared by a green synthesis method and showed a good adsorption performance for removing 2,4-dichlorophenoxyacetic acid (2,4-D) from water. UiO-66-NH 2 was analyzed by a variety of characterization methods and the adsorption properties of 2,4-D on UiO-66-NH 2 were investigated by static adsorption experiments. The results showed that the adsorption of 2,4-D had a wide pH range (2–10) and good salt tolerance with the adsorption equilibrium time about 2 h. The maximum adsorption capacity from Langmuir was up to 652 mg g −1 at 303 K. The isotherms can be described by Langmuir model and the adsorption kinetics was consistent with pseudo-second-order kinetic model and Elovich model. The regeneration efficiency was still 95% after 5 cycles with 0.01 mol L −1 NaOH as desorption solution. The feasibility of practical application of UiO-66-NH 2 was explored by simulating actual wastewater at different pH. UiO-66-NH 2 is promising to remove 2,4-D from water. Graphical abstract
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Zan Chen,Zongping Hong,Hong Wu,Cheng Li,Zhongyi Jiang
Hybrid membranes based on the Tröger’s base polyimide (PI-TB) as a rigid microporous polymer matrix containing a kinked N-heterocycle and a kind of CO2-philic porous UiO-66-NH2 nano-filler were successfully fabricated for gas separation. This new hybrid membrane exhibits good interfacial compatibility through hydrogen bonds and charge transfer interactions between the PI-TB matrix and the UiO-66-NH2 nano-filler, thus enabling a relatively high loading and well dispersion of nano-filler. Meanwhile, the as-synthesized UiO-66-NH2 nanoparticles increase the average inter-chain spacing distance of PI-TB by interfering with the packing of polymer chains and thus providing additional transport pathways in the membranes. The pure gas permeabilities and ideal selectivities for CO2/CH4, CO2/N2, and O2/N2 systems were investigated at 35 °C and a feed pressure of 1 bar. Among them, the hybrid membrane containing 30 wt % UiO-66-NH2 exhibits the optimal gas separation performance with enhanced permeabilities of CO2 and O2 increased by ∼166% (415 and 92.3 Barrer, respectively) while maintaining comparable CO2/CH4, CO2/N2, and O2/N2 gas pair selectivities (25.0, 18.9, and 4.2, respectively) with the pristine PI-TB membrane. This work enriched the studies on the post-modification of PI-TB as a potential candidate membrane material for gas separation.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 20
·6813-6822
·
IF 4
Ruowen Liang,Shihui Wang,Yuzhou Xia,Ling Wu,Renkun Huang,Zhoujun He
Designing frustrated Lewis pair (FLP)-structured photocatalysts is a new challenge in catalysis. In particular, the relationship between the active sites and photocatalytic charge transport mechanism over FLP-structured photocatalysts is still ill-defined. In this study, a novel perylene-3,4,9,10-tetracarboxylic diimide/UiO-66(Ti/Zr)–NH2 (denoted as PDI/TUZr) photocatalyst is successfully constructed using an ammoniation process. The PDI/TUZr heterojunction is equipped with a unique “Zr/Ti SBUs-ligand-PDI” FLP structure and exhibits remarkable catalytic FLP properties. In this “Zr/Ti SBUs-ligand-PDI” structure, the Zr/Ti bimetal centers and PDI serve as Lewis acid and base sites, respectively, and the C–N chemical bond provides a channel for electron transmission, and a bimetallic system facilitates electron transfer from excited ligand to Zr/Ti-SBUs nodes. These superior microstructural designs cooperate to promote substrate activation for photocatalytic antibacterial reactions. Accordingly, 2.2-fold enhancement is achieved in visible photocatalytic antibacterial activity on Staphylococcus aureus for 4%PDI/0.2TUZr composite compared with unadorned UZr. This study provides insights into the formation and carrier transfer behaviors of solid FLP on MOFs and illustrates a rational strategy for the construction of highly efficient photocatalysts.
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Sustainability
·
2023
·Vol. 15
·期 18
·13382
·
IF 3.9
Qihang Dai,Ju Liu,Junjie Zheng,Bo Fu
Metal–organic frameworks (MOFs) hold great potential for efficient removal of particulate matter (PM) due to their high porosity and tunable surface groups. In this work, sustainable bacterial cellulose (BC) was employed as a substrate for Zr-based MOF (i.e., UiO-66-NH2) deposition. Specifically, the UiO-66-NH2@BC aerogel exhibits a multi-level pore structure with a specific surface area of 103 m2/g. Pristine BC aerogels indicated a removal efficiency of 50.6% for PM2.5, with a pressure drop of 22.8 Pa. While UiO-66-NH2@BC aerogels showed a PM2.5removal efficiency of 96.9%. The filtration mechanism can be assigned to the following reasons: (i) the interception/impaction of PM with the fibrous and porous aerogel network; and (ii) the presence of polar amine groups that boost electrostatic interactions between PM and MOFs. Moreover, as-prepared filters can be regenerated in a facile way with good reusability and long-term stability.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 327
·期 2
·811-819
·
IF 1.371
Du Ziyao,Li Bolin,Jiang Chao,Sun Ruopei,Chen Suwen
A metal–organic framework, UiO-66-NH 2 , was designed, synthesized and characterized in this study. By conducting solvothermal method, Salicylaldehyde (Sal) and 2,4-dihydroxybenzaldehyde (MHBA) were grafted onto UiO-66-NH 2 via post-treatment to obtain the functionalized material UiO-66-Sal and UiO-66-MHBA. The three materials above were characterized, and the effects of solid–liquid ratio, pH, ionic strength, and oscillation time on U(VI) adsorption were studied. The relevant experimental results fitted well with pseudo-second-order kinetic equation and thermodynamic adsorption model.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Shubo Wang,Yuan Lin,Jian Yang,Lei Shi,Guang Yang,Xupin Zhuang,Zhenhuan Li
Metal–organic frameworks (MOFs) exhibit high proton conductivity , thermal stability, and offer immense flexibility in terms of tailoring their size. Owing to their unique characteristics, they are desirable candidates for proton conductors . Nevertheless, constructing ordered MOF proton channels in proton exchange membranes (PEMs) remains a formidable challenge. Herein, blend nanofibers of cellulose and UiO-66-NH 2 (Cell–UiO-66-NH 2 ) obtained via the electrospinning process were embedded in a sulfonated polysulfone matrix to obtain high-performance composite PEMs with an orderly arrangement of UiO-66-NH 2 . Comprehensive characterization and membrane performance tests reveal that composite membrane with 5 wt% (nominal) UiO-66-NH 2 have revealed high proton conductivity of 0.196 S cm −1 at 80 °C and 100% relative humidity. Meantime, the composite membrane exhibits a low methanol permeability coefficient (~5.5 × 10 −7 cm 2 s −1 ). Moreover, the composite membrane exhibits a low swelling ratio (17.3%) even at 80 °C. The Cell–UiO-66-NH 2 nanofibers exhibit strong potential for use as a proton-conducting nanofiller in fuel-cell PEMs.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 17
·5943-5950
·
IF 4.39
Lu Feng,Jirong Lan,Fangyuan Chen,Haobo Hou,Hong Zhou
Metal–organic frameworks (MOFs), as a new class of proton conductors, have attracted much attention in the application of proton exchange membranes due to their precisely defined structure and tailorable functionality. However, for most of the MOF materials, their long-term stability is a huge barrier to practical application. Therefore, the structural stability of MOFs is an important prerequisite for the design and development of proton conductors with ultra-high conductivity. In this study, the stable UiO-66-NH2 is optimized as the precursor, and the modified material of DT-UiO-66 is designed and developed by introducing the 3,5-diamino-1,2,4-triazole molecule into the framework of UiO-66-NH2 through a post-synthesis strategy. Satisfactorily, DT-UiO-66 maintains the stability of the original skeleton. The alternating current impedance measurements indicate that a significantly improved proton conductivity of 4.47 × 10−3 S cm−1 is obtained at 100% relative humidity (RH) and 373 K for DT-UiO-66, which is attributed to the increasing number of proton sources and hopping sites. Moreover, DT-UIO-66 shows an outstanding stability under high temperature and high humidity conditions for at least 16 h, suggesting its potential application as a proton exchange membrane.
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