Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 5
·1-12
·
IF 4.5
Song Zhicong,Zhou Juntong,Jin Liping,Guan Yu,Wang Wei,Guo Wenwen
To increase the fire safety of epoxy resin, this study employed a layer-by-layer self-assembly method to prepare a biologically flame-retardant coating-modified zirconium-based metal-organic framework (chitosan/phytic acid (CS/PA) @UiO-66). This study also attempted to incorporate boron nitride (BN) to enhance the flame-retardant properties of epoxy resin composites. The results from Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy confirmed the successful synthesis of UiO-66 and illustrated the assembly of CS and PA onto UiO-66 through a self-assembly strategy. Thermogravimetric analysis in conjunction with cone calorimetry and Raman spectroscopy analyses indicated that incorporating biologically-based flame-retardant coating-modified CS/PA@UiO-66 and BN nanosheets could effectively increase the flame-retardant performance of epoxy composites. Compared with pure epoxy resin, the incorporation of CS/PA@UiO-66-3 and CS/PA@UiO-66-3/BN led to a reduction in the peak heat release rate and total heat release values of 61.13% and 22.36% for EP/CS/PA@UiO-66-3 and EP/CS/PA@UiO-66-3/BN, respectively. Notably, EP/CS/PA@UiO-66-3/BN presented a continuous and dense char layer surface with increased graphite arrangement and higher residual char content after thermal degradation and combustion, thereby providing effective suppression of heat, mass, and oxygen transfer, demonstrating promising flame-retardant efficacy. Consequently, this study successfully improved the fire safety of epoxy resin and presented a new approach for the use of biologically-based flame-retardants.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-10
·
IF 5.479
Yang Yong,Cheng Jingli,Wang Biao,Guo Yirong,Dong Xiaowu,Zhao Jinhao
A method is described for simultaneous voltammetric determination of the pesticides triazophos (TRS) and thiacloprid (THD). A glassy carbon electrode (GCE) was modified with a metal-organic framework (type UiO-66-NH 2 ) which has a large specific surface (1018 m 2 ·g −1 ) and contains large amounts of Cd(II) and Pb(II) ions, with adsorption capacities of 230 and 271 mg·g −1 , respectively. The antigen-loaded particles were then bound to antibody, magnetically separated, and analyzed by square wave voltammetry to give signals for Cd(II) and Pb(II) at −0.82 and − 0.56 V (vs. Ag/AgCl) for TRS and THD, respectively. Under optimized conditions, the method has a wide linear range (0.2–750 ng·mL −1 ) and low detection limits (0.07 and 0.1 ng·mL −1 at a S/N of 3 for TRS and THD, respectively). It is perceived that this assay represents a useful tool for simultaneous determination of multiple pesticide residues. The method has a wide scope in that may be extended to monitoring of other small organic pollutants by changing the types of metal ions and by using other antibodies.
Schematic presentation of an amino-modified metal-organic framework (type UiO-66-NH 2 ) loaded with Cd(II) and Pb(II) ions for simultaneous electrochemical immunosensing of triazophos (TRS) and thiacloprid (THD). It is based on the fabrication of antigen (Ab)-immobilized UiO-66-NH 2 -based signal tags (a), and of an antibody (Ab)-immobilized magnetic bead (MB-COOH)-based capture probes (b).
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CHEMOSPHERE
·
2025
·
IF 8.1
Si-yuan He,Wei Wen,Peng Wu,Zhe Meng
Developing a green and efficient technology for decomposing aflatoxin B 1 (AFB 1 ) and ochratoxin A (OTA) in grains has important theoretical value and application prospects for ensuring food safety. A dual Z-scheme ternary heterojunction photocatalyst, Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ /BiVO 4 /NH 2 -UiO-66 (SBN), was prepared via a self-assembling hydrothermal approach. The SBN heterojunction photocatalyst exhibits round-the-clock photocatalytic activity due to the intrinsic light source of Sr 2 MgSi 2 O 7 : Eu 2+ , Dy 3+ (SMS). Dual Z-scheme mechanism was proposed and validated through detailed analysis of quenching experiments, ESR spectra, band arrangement, and charge transfer processes. The dual Z-scheme mechanism not only promotes the effective transfer and separation of photo generated charge carriers during charge carrier transport, but also maintains significant reduction and oxidation potentials. SBN photocatalyst exhibits stable and persistent photocatalytic performance, significantly enhancing the degradation efficiency of AFB 1 and OTA under all-weather conditions. Experimental data shows that the removal rate of AFB 1 increased from 69.60 % after 60 min of illumination to 83.9 % after 4 h of turning off the light source; At the same time, the removal rate of OTA increased from 64.8 % to 78.1 %. •O 2 − and •OH were identified as key active species in photocatalytic reactions. Based on the analysis of AFB 1 and OTA degradation intermediates and the prediction of degradation sites using density functional theory (DFT), degradation pathways for AFB 1 and OTA were proposed. Collectively, these findings suggest a highly promising practical approach for the detoxification of mycotoxins in grain commodities.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Qingsong Zhang,Qimou Deng,Yaoyao Zhang,Yang Xiao,Chunlei Zhang,Haiyi Gong,Qingming Zeng,Qingyan Zhang,Qingyi Zeng
Unavoidable organics in uranium wastewater or contaminated waters derive great challenges to traditional uranium removal techniques. Here, a drivingpower enhanced photocatalytic fuel cell (DEPFC) is designed by using a carbon felt (CF)-based UiO-66-NH 2 derived zirconia (ZrO 2 )/N-doped porous carbon (ZrON-C/CF) cathode and a monolithic photoanode, composing of a front FTO glass-based BiVO 4 film and a rearmounted Si photovoltaic cell, for effectively oxidizing organics and simultaneously reducing UO 2 2+ from complex wastewater under sunlight illumination. The water contact angle measurements demonstrate that ZrO 2 can improve the hydrophilia of cathode thus increases the contact between UO 2 2+ and cathode. The density functional theory indicates that N-doping can enhance the electronegativity of cathode and increases UO 2 2+ adsorption. Meanwhile, the enhanced UO 2 2+ reduction facilitates the charge separation in BiVO 4 film, therefore enhancing the organic oxidation. Consequently, under AM 1.5 illumination, the designed DEPFC can remove almost 100% of UO 2 2+ and simultaneous degrade 99% organics within 40 min
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BIOSENSORS & BIOELECTRONICS
·
2026
·
IF 11.8
Lingsong Lu,Yingying Zhang,Bei Liu,Nuo zhou,Dao jun Yu,Ying Wang
Circular RNAs (circRNAs) represent an emerging family of noncoding transcripts defined by closed-loop architecture, which are now established as key participants in the etiology of tumorigenesis and malignant progression. While circRNAs show potential as therapeutic targets and biomarkers, the accurate detection of circRNAs remains challenging due to interference from homologous linear RNAs. In this study, an ultrasensitive method for detecting circ_0051240 based on the sulfhydrated toehold capture probe-initiator assembly-mediated hybridization chain reaction (HCR) and the CRISPR-Cas12a system was developed. The capture probe (with a toehold domain)-initiator strand duplex was ingeniously fabricated to identify the back-splice junction (BSJ) of circRNA. After magnetic enrichment and separation by the Fe 3 O 4 -Au@UIO-66-NH 2 nanocomposite, the initiator strand (H0) was delivered to trigger HCR. The HCR product dsDNA concatemers contained multiply repeated CRISPR-targetable DNA sites that were readily recognized by the CRISPR RNA (crRNA). This specific recognition and binding activated the CRISPR-Cas12a system's collateral endonuclease activity, leading to cleavage of the fluorophore-quencher (FQ) reporters and fluorescence emission at a characteristic wavelength. This design eliminated linear RNA-related interference and enhanced the detection of fluorescence intensity (FI). Under optimal conditions, the proposed HCR/CRISPR-Cas12a method exhibited a wide quantitative measurement range spanning from 45 pM up to 180 nM, achieving a notable limit of detection (LOD) of 0.03 pM. In this study, a novel circRNA sensing strategy capable of accurate and highly sensitive quantification of ovarian cancer-specific circRNA was reported. The proposed method exhibits acceptable performance when compared to present approaches.
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FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Wei Ruan,Haoyun Liu,Hao Wu,Yuan Qi,Mengchang Zhou,Changsong Zhou,Zhen Zhang,Hongmin Yang
In this work, the Zr-based MOF was successfully fabricated with 4,6-Diamino-2-mercaptopyrimidine (DMP) and a novel adsorbent (Uio-DMP) was synthesized for the immobilization of Pb 2+ in aqueous medium . The morphological and structural characteristics of Uio-DMP were characterized by X-ray diffractometer (XRD), Fourier transform infrared (FT-IR), Field emission scanning electron microscopy (FE-SEM), Brunner Emmet Teller (BET), and X-ray photoelectron spectroscopy (XPS). The characterization results showed that the Uio-DMP maintained a pristine crystal structure and the sulfhydryl group was introduced to Zr-based MOF after chemical functionalization. The adsorption behavior of Uio-DMP for Pb 2+ was investigated in different conditions (solution pH, sorbent dose, Pb 2+ concentration, adsorption time, and co-existing ions). The experimental results indicated that the optimal pH was 6, the maximum adsorption capacity was 296.5 mg/g, and the Langmuir model well fitted the Pb 2+ removal process based on adsorption isotherm studies. The adsorption kinetic experiments revealed that the adsorption equilibrium could be achieved at 30 min and the adsorption process was consistent with the Pseudo-second-order model. The co-existing ions had a limited impact on Pb 2+ removal and the removal rate of 71.0% was maintained after five consecutive adsorption-desorption experiments. Furthermore, zeta potential and XPS analysis proved that the removal process of Pb 2+ over Uio-DMP was affected by electrostatic interaction , and nitrogen/sulfur atoms acting as the main adsorption sites. This study provides an insight into the removal of Pb 2+ in aqueous medium and the functionalization of adsorbents.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Hong Li,Yiming Wang,Rongxiu Guo,Jianwei Zheng,Zejun Sun,Xinyue Zhang,Ying Guo,Hongna Jia,Qionglin Liang,Hong-bin Sun
The heterogeneously tandem catalytic synthesis is a step-economic and work-up-saving strategy for producing chemicals, but it usually requires a special catalyst to achieve the sequential catalytic reactions . The development of metal organic frameworks provides an opportunity to fabricate multifunctional catalysts. In this work, a MOF-based sandwich-nanostructure catalyst UiO-66-NH 2 @Pt@PCN-222 is fabricated, which is made of the UiO-66-NH 2 as the core, Pt nanoparticles as the interlayer, and the defective PCN-222 as the shell. The developed catalyst shows outstanding performance for the tandem catalytic synthesis, which is the hydrogenation of nitroarenes cascaded with β-dicarbonyl compounds to form β-ketoenamines. The selectivity of β-ketoenamines reached 98% upon the completed hydrogenation of p-nitrotoluene. The stable PCN-222 shell can be regarded as an active armor, which not only protects the Pt particles from leaching or agglomerating, but also has plenty of acid sites that are conducive to the second-step condensation. At the same time, the kinetic studies show that the armor layer also affects the activity of hydrogenation, so that the hydrogenation and condensation reactions can proceed simultaneously to give the best selectivity. Various substituted dicarbonyl compounds and structurally different nitroarenes completed the conversion with excellent conversion (90–99%) and selectivity (87–98%), and this nanocatalyst can be recycled for up to six cycles without the expense of activity.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jiming Huang,Ping Xue,Sheng Wang,Shujun Han,Liguang Lin,Xuan Chen,Zhengbang Wang
Designing recyclable photocatalysts with high activity and stability has drawn considerable attention in the fields of sewage treatment. Herein, a series of heterojunctions constructed by zirconium-based metal–organic frameworks (UiO-66-NH 2 ) and tungsten trioxide (WO 3 ) is immobilized on carbon cloth via a facile solvothermal method , resulting in highly recyclable photocatalysts. Multiple characterization techniques, such as X-ray diffraction, scanning electron microscopy, transmission electron microscopy , X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy, verify the successful synthesis of UiO-66-NH 2 nanospheres on the surface of needlelike WO 3 modified carbon cloth. Results show that the optimal heterojunction photocatalyst exhibits excellent photocatalytic degradation efficiency for the removal of tetracycline (TC) from water, for which nearly 100% of TC is degraded within 60 min under visible light . Trapping experiments and electron spin resonance (ESR) spectra analyses demonstrate that the superoxide radicals O 2 – and photogenerated hole h + play a dominant role in the degradation process. Excellent photocatalytic activity is dominantly attributed to the effective separation of photoinduced carriers in this type-Ⅱ heterostructure system. Moreover, the possible photocatalytic oxidation degradation pathway is confirmed by analyzing intermediates using liquid chromatography mass spectrometry (LC-MS). This study offers a highly efficient strategy to design recyclable heterojunction photocatalysts for the degradation of refractory antibiotics in sewage.
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FOOD CONTROL
·
2021
·
IF 5.548
Weixia Yang,Jinmeng Wang,Yong Han,Xueli Luo,Wenzhi Tang,Tianli Yue,Zhonghong Li
Pb(II), a highly toxic heavy metals that targets the human nervous system, has contaminated water and food in recent years. The nanomaterial of Metal–organic frameworks (MOFs) possesses superior removal performances. However, their practical application is limited by their nature of fine powdery. Herein, we developed robust MOFs film without the adding of polymer in MOFs ink and the modification of the substrate, which was achieved by choosing appropriate substrate of gelatin hydrogel with functional groups and simple thermal-treatment after coating UiO-66-NO 2 onto gelatin hydrogel. The volatilization of the UiO-66-NO 2 dispersant ethyl acetate promotes the rearrangement and dense accumulation of UiO-66-NO 2 crystals to form a dense UiO-66-NO 2 film. During the following thermal-treatment process, –COOH of UiO-66-NO 2 and –NH 2 of gelatin chemically reacted to establish the stable composites of UiO-66-NO 2 film and gelatin hydrogel. The results of batch adsorption experiments demonstrate that adsorption behaviors of the as-synthesized gelatin/UiO-66-NO 2 film composite hydrogels can be explained by the pseudo-second-order kinetic model and the Langmuir isotherm model, stating that this adsorption process involves with a chemical monolayer adsorption. Besides, gelatin/UiO-66-NO 2 film composite hydrogels own satisfactory removal efficiency for Pb(II) in apple juice, and the adsorption process has little impairment on the quality of apple juice. These results suggest that MOFs film is suitable for water decontamination and food safety control fields.
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TALANTA
·
2016
·
IF 4.035
Lijie Liu,Lian Xia,Chuanxiang Wu,Fengli Qu,Guoliang Li,Zhiwei Sun,Jinmao You
A stable zirconium (Ⅳ)-based metal organic frameworks (UIO-67) material possessing good chemical, thermal and water stability was synthesized and applied as a sorbent for the dispersive solid phase extraction (DSPE) of 8 plant growth regulators (PGRs) in fruit samples. Fluorescence labeling combined with high performance liquid chromatography fluorescence detection (HPLC-FLD), was used to quantify the target analytes. Characterization of the UIO-67 material was performed by X-ray diffraction(XRD) and scanning electron microscopy (SEM). The experimental parameters, such as amount of UIO-67, type and volume of eluting solvent, adsorption and desorption time, were optimized. Under the optimized conditions, good linearity was observed in the range of 10–1000 pmol/mL with R 2 >0.9989. The limits of detection and limits of quantification were in the range of 0.21–0.57 ng/mL and 0.81–1.91 ng/mL, respectively. The intra-day and inter-day precisions (based on the relative standard deviation, n =3) of the PGR derivatives were under 3.1% and 5.3% respectively and the accuracies of the method for the PGRs were in the range from 89.3% to 102.3%. The developed method was successfully applied to analyze PGRs residues in fruit samples. The proposed method is proved to be simple, environment-friendly and inexpensive and it is feasible to directly use UIO-67 as sorbent to extract targets by varying conditions.
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CHEMICAL PHYSICS LETTERS
·
2026
·
IF 2.9
Ning Fu,Xiaoqing Yao,Xuechang Ren,Yuxiang Chen,Hongjin Chen
AgCl/UiO-66/g-C 3 N 4 ternary heterojunction was constructed. • ACU-70 achieved 99.4% RhB degradation within 105 min. • ACU-70 showed a rate constant of 0.05011 min −1 . • ·O 2 − and h + were identified as the dominant active species. • The Type-II/Z-scheme pathway promoted charge separation. Constructing heterojunctions is regarded as an effective strategy to facilitate the separation of photogenerated charge carriers. A novel Type-II/ Z -scheme tandem heterojunction AgCl/UiO-66/g-C 3 N 4 composite photocatalyst was successfully prepared in this study. The catalyst achieved a 99.4% degradation rate of RhB within 105 min, with an apparent kinetic constant k value of 0.05011 min −1 . These values are 15, 16, and 7.5 times higher than those of pure g-C 3 N 4 , UiO-66, and AgCl, respectively. ·O₂ − and h + are the main active species in the catalytic system. Combined with UV–visible diffuse reflectance spectroscopy results, the successful construction of the Type-II/ Z -scheme tandem heterojunction was further confirmed. A proposed mechanism for the enhanced photocatalytic activity of the AgCl/UiO-66/g-C 3 N 4 composite under UV–visible light illumination. Download: Download high-res image (112KB) Download: Download full-size image
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Small
·
2023
·Vol. 19
·期 20
·2207198
·
IF 13.3
Jiayou Liu,Xiaoxiang Huang,Liuhu Jia,Linfeng Liu,Qianqian Nie,Zhongchao Tan,Hesheng Yu
Efficient nitric oxide (NO) removal without nitrogen dioxide (NO 2 ) emission is desired for the control of air pollution. Herein, a series of (Zr/Ti)UiO-66-NH 2 with congenetic shell–core structure, denoted as Ti-UION, are rapidly synthesized by microwave-assisted post-synthetic modification for NO removal. The optimal Ti-UION (i.e., 2.5Ti-UION) exhibits the highest activity of 80.74% without NO 2 emission with moisture, which is 21.65% greater than that of the UiO-66-NH 2 . The NO removal efficiency of 2.5Ti-UION further increases to 95.92% without photocatalyst deactivation under an anhydrous condition. This is because selectively produced NO 2 in photocatalysis is completely adsorbed into micropores, refreshing active sites for subsequent reaction. In addition, the enhanced photocatalytic activity after Ti substitution is due to the presence of Ti electron acceptor, the potential difference between the shell and core of Ti-UION crystal, and the high conductivity of Ti O units. Additionally, the improved adsorption of gas molecules not only favors NO oxidation, but also avoids the emission of NO 2 . This work provides a feasible strategy for rapid metal substitution in metal-organic frameworks and insights into enhanced NO photodegradation.
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