MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Yujie Xiao,Zhenxi Liu,Litong Yu,Xiaofeng Lv,Juan Du,Baozhan Zheng,Yong Guo
A stable B, N-CDs@SiO 2 RTP composite was constructed via silica confinement. • The composite shows blue fluorescence and green phosphorescence with 15 s afterglow. • A UV–Vis/fluorescence/phosphorescence tri-mode platform was developed for TNP sensing. • Portable RTP-foam enables visual and semi-quantitative on-site TNP detection. The development of optical probes with multimodal responses is of great significance for improving the reliability of hazardous pollutant detection. Herein, a room-temperature phosphorescent (RTP) composite based on B/N co-doped carbon dots (B/N-CDs) confined within a SiO 2 ) matrix (B/N-CDs@SiO 2 ) was developed for the tri-mode detection of 2,4,6-trinitrophenol (TNP). B/N-CDs@SiO 2 exhibited blue fluorescence at 450 nm and green phosphorescence at 520 nm, with an average phosphorescence lifetime of 1.91 s and a visible afterglow lasting approximately 15 s, together with satisfactory optical stability. Interestingly, B/N-CDs@SiO 2 exhibits excellent response to TNP in both UV–vis absorption, fluorescence, and phosphorescence, thereby establishing a tri-mode sensing platform for TNP detection with detection limits of 1.81 μM, 0.32 μM, and 0.54 μM, respectively. The probe also demonstrates high selectivity for TNP over common ions and structurally related aromatic compounds, along with strong anti-interference capability. In spiked recovery tests in kinds of real samples, the satisfactory recoveries ranging from 91.2% to 108.9% (RSD: 0.34% to 3.74%) demonstrating its higher detection accuracy. Finally, the composite can be immobilized onto polyurethane foam to construct a portable visual sensing platform, which also successfully enabled the tri-mode and semi-quantitative detection of TNP. This work opens up a new avenue for the development of multi-signal detection systems for expanding their practical applications. Schematic illustration of the synthesis of B/N-CDs@SiO 2 and its application in TNP tri-mode sensing construction for TNP visual detection. Download: Download high-res image (187KB) Download: Download full-size image
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JOURNAL OF CHROMATOGRAPHY A
·
2026
·
IF 4
Chengzhe Zhou,Zurong Wang,Shuaibo Shao,Xiaoyi Wang,Qidong Yu
A novel cationic guanidine COF with abundant hydrogen-bonding sites was designed for the efficient and specific enrichment of NBs. • A SPME-GC-MS method was established for the detection of trace NBs with extremely high sensitivity. • The established method was successfully applied to the enrichment and detection of trace NBs in different tea samples with excellent accuracy. Tea ( Camellia sinensis ) is deeply loved by consumers worldwide, with hundreds of millions of people maintaining daily tea-drinking habits, making its food safety a significant concern. Among various potential contaminants, hydrophilic nitrobenzene compounds (NBs) are particularly problematic due to their high solubility in tea infusion, strong bioaccumulation potential, and high toxicity. Even trace residues can migrate into the tea infusion during brewing, posing long-term risks to human health. Therefore, Monitoring trace NBs in tea is crucial. However, due to matrix interference from tea leaves and the extremely low concentrations of NBs, existing standard methods cannot accurately quantify trace NBs in tea. To address this challenge in enrichment and analysis, this study, based on the physicochemical properties of NBs, designed and prepared a cationic guanidine covalent organic framework (COF), named TG-DHTP. This material contains abundant hydrogen bond donors (N-H, O-H) and cationic sites (= + NH-), enabling efficient and selective enrichment of NBs through synergistic interactions including O-H···O hydrogen bonds, N-H···O hydrogen bonds, electrostatic attraction, π-π interactions, and van der Waals forces. By combining TG-DHTP with SPME-GC-MS, an analytical method was established for trace NBs in tea. The established method exhibited a broad linear range (80.0–10000.0 ng L -1 ), low detection limit (20.0 ng L -1 ), and good recoveries (83.6–117.6%). This study not only provides a reliable analytical method for monitoring trace NBs in tea, but also offers a rational design strategy for developing new adsorbent materials targeting polar and hydrophilic contaminants in food safety. Download: Download high-res image (160KB) Download: Download full-size image
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JOURNAL OF MOLECULAR STRUCTURE
·
2026
·
IF 4.7
Xutao Ding,Li Zeng,Peijian Ma,Rui Wang,Jinlong Yao,Zhichao Yu,Yu Xia,Xin Xiao
Nitrotoluene isomers are vital chemical intermediates, but their separation is challenging due to similar properties. This work introduces a supramolecular strategy using cucurbit[8]uril (Q[8]) to selectively isolate ortho-nitrotoluene (ONT). Through methods including single-crystal XRD, ITC, GC, and theoretical calculations, host–guest interactions in formic acid were characterized. Gradient solvent volatilization of Q[8] with isomer mixtures enabled controlled crystallization. Results show Q[8] strongly prefers ONT, with binding constants of 3.628×10⁶ M⁻¹ (ortho) vs. 8.712×10⁵ M⁻¹ (meta) and 2.173×10⁵ M⁻¹ (para), giving selectivity ratios of 4.16 and 13.37, respectively. Crystal structures reveal stabilization via π–π stacking and hydrogen-bonding networks. These interactions drive multidimensional assembly into ordered architectures through synergistic surface interactions, hydrogen bonding, and aromatic stacking. This work extends cucurbituril applications in adsorption and separation.
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FOOD CHEMISTRY
·
2023
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IF 8.8
Yalan Hu,Youyou Li,Yueru Shi,Yixin Kuang,Suxin Zhou,Yuan Peng,Yuefan Liu,Luyi Chen,Ningbo Zhou,Juan Zheng,Fang Zhu,Gangfeng Ouyang
Persistent organic pollutants (POPs) are widely distributed in the environment and are toxic, even at low concentrations. In this study, we first used hydrogen-bonded organic framework (HOF) to enrich POPs, based on solid phase microextraction (SPME). The HOF called PFC-1 (self-assembled by 1,3,6,8-tetra(4-carboxylphenyl)pyrene) has an ultra-high specific surface area, excellent thermochemical stability, and abundant functional groups, making it potential to be an excellent coating in SPME. And the as-prepared PFC-1 fiber have demonstrated outstanding enrichment abilities for nitroaromatic compounds (NACs) and POPs. Furthermore, the PFC-1 fiber was coupled with gas chromatography-mass spectrometry (GC–MS) to develop an ultrasensitive and practical analytical method with wide linearity (0.2–200 ng·L −1 ), low detection limits for organochlorine pesticides (OCPs) (0.070–0.082 ng·L −1 ) and polychlorinated biphenyls (PCBs) (0.030–0.084 ng·L −1 ), good repeatability (6.7–9.9%), and satisfactory reproducibility (4.1–8.2%). Trace concentrations of OCPs and PCBs in drinking water, tea beverage, and tea were also determined precisely with the proposed analytical method.
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RSC Advances
·
2023
·Vol. 13
·期 3
·2024-2035
·
IF 3.9
Jiale Wu,Liguo Wang,Shuang Xu,Yan Cao,Ziqiang Han,Huiquan Li
Developing efficient and green catalytic systems is highly desired in the syntheses of alicyclic amines via hydrogenation of nitroaromatics. Herein, we developed Ru–Pd dual active site catalysts in which Ru and Pd species were anchored and highly dispersed on air-exfoliated carbon nitride (Ru–Pd/C3N4-air). As-prepared catalysts were employed in the hydrogenation of nitrobenzene (NB) to cyclohexylamine (CHA). Compared with single Ru or Pd based catalysts, Ru–Pd dual active site catalysts obtained a higher CHA production rate of 26.7 mol CHA mol−1 Ru·Pd h−1 at 80 °C and 3 MPa H2. The activation energy for the hydrogenation of the nitro group and benzene ring was calculated as 26.26 kJ mol−1 and 66.30 kJ mol−1, respectively. Intrinsic kinetic studies demonstrated that Pd was the dominant metal for hydrogenation of nitro group, while Ru was dominant for benzene ring. Thereinto, the corresponding non-dominant metals enhanced activation and dissociation of H2, thereby improving catalytic activity significantly. This excellent performance of Ru–Pd catalysts could be attributed to highly dispersed Ru–Nx and Pd–Nx at a nanoscale distance, which was conducive to metal-assisted hydrogenation. Stability investigation showed that the performance of Ru–Pd catalysts could be essentially maintained at a high level. Additionally, the substrate scope could be successfully extended to hydrogenation of other nitroaromatics with different substituents.
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Small
·
2023
·
IF 13.3
Zhihao Chen,Malik Zeeshan Shahid,Xinyan Jiang,Meng Zhang,Danrui Pan,Hongpeng Xu,Guocan Jiang,Jin Wang,Zhengquan Li
Halide perovskites exhibit outstanding optoelectronic properties, which make them an ideal choice for photocatalytic CO 2 reduction and benzyl alcohol (BA) oxidation. Nevertheless, the simultaneous realization of the above redox coupling reactions on halide perovskites remains a great challenge, as it requires distinct catalytic sites for different target reactions. Herein, the catalytic sites of Cs 2 AgBiCl 6 (CABC) are regulated by doping Fe for efficient coupling of photocatalytic CO 2 reduction and BA oxidation. The Fe-doped CABC (Fe: CABC) exhibits an enhanced visible-light response and effective charge separation. Experimental results and theoretical calculations reveal a synergistic interplay between Bi and Fe sites, where the Bi and Fe sites have lower activation energies toward CO 2 reduction and BA oxidation. Further investigations demonstrate that electrons and holes prefer to accumulate at the Bi site and Fe site under light irradiation, respectively, which creates favorable conditions for facilitating CO 2 reduction and BA oxidation. The resultant Fe: CABC achieves a high photocatalytic performance toward CO (18.5 µmol g −1 h −1 ) and BD (1.1 mmol g −1 h −1 ) generation, which surpasses most of the state-of-the-art halide photocatalysts. This work demonstrates a facile strategy for regulating the catalytic site for redox coupling reactions, which will pave a new way for designing halide perovskites for photocatalysis.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Tian-Tian Ma,Cheng Yang,Hai-Long Qian,Piming Ma,Tianxi Liu,Xiu-Ping Yan
Development of novel functional materials for effective isomer separation is of great significance in environmental science, chemical industry, and life science due to the different functions of isomers. However, the similar physicochemical properties of isomers make their separation greatly challenging. Here, we report the fabrication of trifluoromethyl-functionalized 2D covalent organic framework (COF) TpTFMB with 2,2′-bis(trifluoromethyl)benzidine (TFMB) and 1,3,5-triformylphloroglucinol (Tp) for the separation of isomers. TpTFMB was in situ-grown on the inner surface of a capillary for the high-resolution separation of isomers. The introduction of hydroxyl and trifluoromethyl functional groups with uniform distribution in 2D COFs is a powerful tactic to endow TpTFMB with various functions such as hydrogen bonding, dipole interaction, and steric effect. The prepared TpTFMB capillary column enabled the baseline separation of positional isomers such as ethylbenzene and xylene, chlorotoluene, carbon chain isomers such as butylbenzene and ethyl butanoate, and cis–trans isomers 1,3-dichloropropene. The hydrogen-bonding, dipole, and π–π interactions as well as the structure of COF significantly contribute to the isomer separation. This work provides a new strategy for designing functional 2D COFs for the efficient separation of isomers.
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CATALYSIS LETTERS
·
2022
·Vol. 152
·期 12
·3725-3732
·
IF 2.936
Guo Pan,Zhan Yuzhong,Yang Yanliang,Lu Tianliang
The preparation of high-performance supported Pd catalysts for the hydrogenation of aromatic nitro is of great importance. In this paper, covalent-triazine framework (CTF), an organic porous crystalline material connected by covalent bonds, was employed as the support for the preparation of Pd heterogeneous catalyst. The framework of CTF was maintained due to the utilization of cyclohexene as a moderate reductant for PdCl 2 . The catalysts were characterized by transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The influence of reaction conditions (temperature, pressure, reaction time, concentration substrate and catalyst dosage) were investigated. At very mild reaction conditions (30 °C, 0.1 MPa H 2 , 2 mg Pd/CTF), the nitrobenzene was nearly stoichiometric hydrogenated to aniline. The Pd/CTF was effective for the conversion of a series of aromatic nitro compounds to the corresponding aromatic amines with good yield. The results showed that Pd/CTF has good catalytic activity and stability in the heterogeneous catalytic hydrogenation. Graphical Abstract
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Journal of Flow Chemistry
·
2023
·Vol. 13
·期 3
·311-323
·
IF 2.7
Song Jing,Cui Yongjin,Wang Yujun,Wang Kai,Deng Jian,Luo Guangsheng
The nitration of toluene with mixed acid is one of the most representative nitration reactions. Accurate kinetic study is essential for controlling the reaction and designing reactors. Due to the characteristics of fast rate, high exothermicity and heterogeneity in toluene nitration, the effects of mass and heat transfer may result in inaccurate determination of kinetics. In this work, the adiabatic temperature rises of the reaction system were studied to provide precise ranges of experimental conditions for accurately controlling the reaction rate and heat release rate in a liquid–liquid microflow system. The adiabatic temperature rise was successfully controlled to below 0.3 °C. The effects of mass and heat transfer on the reaction rate were completely eliminated, so that the kinetic study was carried out under the control of intrinsic kinetics only. The activation energy for toluene nitration was determined to be 28.00 kJ/mol. The activation energies for the formation of o -nitrotoluene and p -nitrotoluene were obtained for the first time, which were 25.71 and 31.91 kJ/mol, respectively. The obtained kinetic models can predict the reaction performance of toluene nitration very well.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xiaoying Feng,Yixin Kuang,Suxin Zhou,Juan Zheng,Gangfeng Ouyang
The substitution position of functional group is potential to affect the microstructure and adsorption performance of functionalized polystyrene (PS) nanospheres, yet to be explored. In this study, a series of hyper-crosslinked PS nanospheres with isomeric chlorine substitution have been prepared by emulsion polymerization and Friedel-Crafts reaction. The detailed characterizations indicated that the substitution position of chlorine greatly influenced the pore volume and specific surface area of constructed PS nanospheres, and the hyper-crosslinked ortho -Cl-functionalized nanospheres ( o - x ClFNs) possessed the highest specific surface area and largest pore volume, followed by para - and meta -Cl-functionalized nanospheres ( p - x ClFNs and m - x ClFNs). Besides, these PS nanospheres were fabricated as even solid phase microextraction (SPME) coatings to study their extraction performance for substituted benzenes, chlorobenzenes, polychlorinated biphenyls (PCBs) and polybrominated biphenyls (PBBs). The experimental results showed that the p - x ClFNs possessed the most outstanding extraction efficiencies for halogenated organic pollutants, and it was combined with gas chromatography-mass spectrometry (GC–MS) to develop a highly sensitive method, realizing the precise quantifications of trace PCBs and PBBs in environmental water. Our work provided invaluable insights on the choice of functional monomer to construct high-performance adsorbent, also demonstrated the important function of PS on the enrichments of organic pollutants.
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ACS Applied Nano Materials
·
2021
·
IF 5.097
Wei Li,Jieli Lyu,Haimao Song,Zetao Song,Ruoyu Wang,Lei Ye,Zhongshan Liu,Yu Fang,Junxia Peng
The combination of micron-scale macropores with meso-/micropores into three-dimensional (3D) macroscopic architectures could give increasing attention to both fast diffusion and mass transfer and exposure of the intrinsic micropores, thereby improving the performance and realizing the real-world applicability of nanoscale functionalized materials. In this report, the emulsion-droplet-templated method was used for the preparation of a hierarchically porous macroscopic covalent organic polymer (COP) monolithic foam, showing compressibility, high mass transfer, and excellent chromatographic separation capacity. The as-synthesized COP nanoparticles with the size of about 40 nm possessed good crystallization and high chemical and thermal stability. More importantly, the resulting COP nanoparticles showed interfacial activity, absorbing and accumulating the water/mesitylene interface, thus producing the COP nanoparticle film. As a result, a series of Pickering emulsions stabilized by COP nanoparticles were formed. Emulsion droplets of approximately 4.90 μm could serve as templates, producing hierarchically porous COP monolithic foams via freeze-drying of the starting Pickering emulsions. In view of the effective merging of macropores with meso-/micropores, the very thin disklike COP monolith (1 mm height × 10 mm i.d.) can serve as a separation column, which is highly efficient in differentiating the isomers of p- < o- < m-nitrotoluenes and chloronitrobenzenes. Clearly, the macropores guarantee high mass transfer, while the micropores provide many active sites. Therefore, the resulting COP foam shows excellent chromatographic separation capacity. Finally, the as-prepared COP monolithic foam has great potential as a prospective chromatographic column for highly efficient separation of isomers.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Binbin Feng,Qionghao Xu,Xiaoxue Wu,Chunlin Ye,Yanghe Fu,De-Li Chen,Fumin Zhang,Weidong Zhu
Owing to the competitive hydrogenation of reducible functionalized groups and the complexity of the reaction mechanism, the selective catalytic hydrogenation of nitroarene compounds to value-added amine products is challenging. Herein, we designed and prepared a series of highly efficient iron-based nanocomposites (Fe/Fe 3 C@NC–T) via direct pyrolysis of the presynthesized NH 2 –MIL–101(Fe) octahedrons under nitrogen atmosphere, wherein tiny metallic Fe/Fe 3 C nanoparticles (NPs) were homogeneously inlaid in the N-doped porous carbon matrix. Among the various derived catalysts, Fe/Fe 3 C@NC–750 exhibited the best performance, with good tolerance to several different functional groups for the catalytic transfer hydrogenation of nitroarenes to anilines using N 2 H 4 ·H 2 O as the reductant under mild conditions. This performance was also superior to those of commercial catalysts (Fe, Fe 2 O 3 , and Fe 3 C) and Fe/Fe 3 C@C–750 without N doping. The synergistic catalysis between the Fe-based NP and N dopant mainly contributed to the excellent catalytic performance of Fe/Fe 3 C@NC–750. Moreover, the mechanism study revealed that both the direct route and the condensation route were involved in this catalytic reaction system.
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