CHEMICAL PAPERS
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2025
·
IF 2.5
Gu Peng
Dielectric composites with high dielectric constant, minimal dielectric loss and low conductivity can well serve for energy storage capacitors. High dielectric loss is not favorable due to large energy waste. Here, to improve dielectric constant of poly(vinylidene fluoride–hexafluoropropylene) by electric percolation, semiconducting NiO filler was added to form composites. However, high leakage current from interfaces can lead to high dielectric loss. Doping insulating α-Al 2 O 3 particles with stable structure, low chemical activity and high modulus into above binary composites can reduce dielectric loss. By changing NiO dose, dielectric constant was well tailored. Dose of α-Al 2 O 3 was left unchanged. Dielectric loss, conductivity and dielectric constant of composites were measured. By the same NiO loading, dielectric loss, conductivity and dielectric constant in ternary composites can be reduced, compared with binary composites. The optimal ternary composite should contain 35 wt% NiO and 4 wt% α-Al 2 O 3 . Optimized dielectric traits of this composite can be reflected by dielectric constant of ~ 64 and dielectric loss of ~ 0.27 under 100 Hz electric field.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 13
·1-17
·
IF 3
Zhang Shoucun,Li Zhuomin,Yang Ning,Wu Wenli,Wang Yuan
As an important intermediate, p -nitrophenol has been widely used in the production of various chemicals, including pharmaceuticals, insecticides, and dyes, etc. However, it exhibits significant ecological toxicity and has a tendency to accumulate in organisms, even at very low concentrations. Therefore, it is essential to remove p -nitrophenol as thoroughly as possible from wastewater before discharging it into the environment. Among various treatment methods, physical adsorption stands out as a safe, reliable, and widely applicable approach, particularly suitable for small-scale water treatment applications. In this study, a melamine/terephthalaldehyde-based material (PMT) with a rich mesoporous structure was synthesized. The presence of abundant nitrogen elements within the material’s structure enhances its adsorption capacity for p -nitrophenol. Subsequently, PMT was dispersed as the dispersed phase into a hydrogel (HGel) structure through post-polymerization, which improved the material’s stability during use. Experimental results demonstrated that the gel composite material achieved a 97.6% adsorption removal rate for p -nitrophenol-contained wastewater. Moreover, after six cycles of reuse, the material retained an adsorption removal rate of 84.2%, highlighting its excellent adsorption performance and reusability.
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Molecular Catalysis
·
2025
·
IF 4.9
Pai Peng,Tianhao Li,Yichun Cai,Yao Zhang,Zhuoxi Li,Zhao-Bin Ding,Qiang Chen
Selective hydrogenation of nitroaromatics to anilines is a kind of important reaction in pharmacy industry and fine chemical engineering. However, this reaction is restrained by lack of catalysts and reaction system with high efficiency, energy saving, environmental protection and high selectivity. Herein, Cu nanoclusters were successfully encapsulated into Silicalite-1 zeolite by in-situ hydrothermal synthesis with ligand protection to obtain Cu@S-1 catalyst. The catalyst showed an excellent selectivity of 98 % with substrate conversion of 100 % in the hydrogenation of p -nitrostyrene to 4-vinylaniline using ammonia borane as hydrogen source, which was due to the preferential adsorption effect of Cu@S-1 catalyst on the nitro group. The Cu@S-1 catalyst also exhibits good recycling performance and substrate compatibility.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
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IF 5.4
Le Chen,Jinghong Chen,Zhenxing Tan,Rongrong Hu,Liyuan Xu,Wenxia Wang,Yong yuan,Lihua Zhou
Prussian blue analogues (PBAs), as promising peroxymonosulfate (PMS) activators for water remediation, typically suffer from issues such as agglomeration, morphological inconsistency, and insufficient active site exposure, limiting their practical application. Here, we developed a tannic acid-mediated synthesis of silver-doped PB nanocomposites (TA-AgPB) for efficient activation of PMS and rapid degradation of p-chlorophenol (4-CP). The TA-AgPB system achieved 99% degradation of 4-CP within 10 minutes, exhibiting a kinetic constant 2.1 times higher than that of unmodified AgPB, and exhibited superior adaptability in pH 5.0-9.0. Furthermore, TA-AgPB demonstrated marked performance enhancement, with PMS utilization and mineralization rates increasing from 51.6% and 41.5% to 90.4% and 68.2%, respectively. Ag plays an indispensable role in the activation process. The introduced Ag not only synergizes with Fe centers to facilitate electron transfer but also modulates the electronic structure of the active sites to promote the generation of reactive oxygen species (ROSs). Tannic acid, as a multifunctional green modifier, possesses abundant phenolic hydroxyl groups that not only effectively coordinate with metal ions to suppress Ag + leakage and particle aggregation but also facilitate the formation of uniform nanostructures, significantly increasing active site exposure. Quenching experiments, electron paramagnetic resonance (EPR) and electrochemical studies revealed the synergistic generation of •OH, SO 4 •⁻ , O 2 •⁻ and 1 O 2 , constitutes the primary mechanism for 4-CP degradation. DFT calculations confirmed thermodynamically favorable degradation pathways. This work provides a polyphenol-mediated synthesis strategy for designing stable and efficient PBAs catalysts, advancing their practical application in water purification.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2026
·
IF 5.3
Lei Wang,Yue Huang,Jiawei Su,Haojie Su,Weihao Shen,Sanqing Huang,Xueqin Zhao
Ensuring food safety requires reliable methods to monitor toxic contaminants like p-aminophenol (p-AP), which can migrate from plastic packaging or accumulate as veterinary drug residues in food products. However, the absence of rapid and field-deployable detection methods poses a persistent obstacle to its effective monitoring. In this work, we developed iron-doped silicon quantum dots (Fe-SiQDs) as a robust peroxidase-mimicking nanozyme and engineered a dual-mode sensing platform for p-AP detection comprising a solution-based assay for laboratory use and a hydrogel strip for on-site smartphone-assisted quantification. The solution assay achieved high sensitivity (LOD: 5.22 μM) with excellent correlation to HPLC (R² = 0.9994), while the hydrogel strip enabled quantification within 15 min without complex instrumentation. The Fe-SiQDs-based hydrogel sensor was tested on real-world food matrices including honey and bottled water, achieving accurate recoveries between 93.2% and 119.5% with high reproducibility (RSD < 2.1%). This cost-effective and field-ready system provides a practical solution for rapid screening of p-AP in food samples, offering a useful tool for food safety monitoring.
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Catalysts
·
2026
·Vol. 16
·期 5
·480
·
IF 4.5
Qifan Zhao,Kaijie Li,Hongbo Yu,Hongfeng Yin
p-nitrophenol (p-NP) is a pollutant with environmental persistence, bioaccumulation potential, and significant health risks, and is widely dispersed in wastewater, so efficient removal ofp-NP is imperative. Among the various methods, the catalytic reduction ofp-NP top-aminophenol (p-AP) using sodium borohydride (NaBH4) is a particularly promising one and, herein, catalysts play a crucial role. Among the various metals, Au shows unique catalytic activity forp-NP reduction. However, nanosized Au often exhibit limited activity and stability due to their high surface free energy. To address this challenge, we designed and synthesized Au-SnOxhybrid nanoparticles confined within hollow mesoporous silica nanoreactors (Au-SnOx@hm-SiO2) via a soft-template-assisted co-adsorption strategy. The resulting bimetallic Au-SnOx@hm-SiO2nanoreactor showed significantly enhanced catalytic activity toward the NaBH4-mediated reduction ofp-nitrophenol (p-NP) compared with its monometallic Au@hm-SiO2counterpart, owing to the synergistic effect between Au and SnOx. Among various Au/Sn ratios, the catalyst with an Au/Sn molar ratio of 1:0.1 demonstrated the highest activity, achieving complete conversion ofp-NP within 5 min at ap-NP/Au molar ratio of 529:1—a tenfold improvement over Au@hm-SiO2. Moreover, the catalyst maintained high efficiency over six consecutive cycles, with only slight deactivation, benefiting from the protective silica shell.
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POLYMER COMPOSITES
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2026
·
IF 4.9
Wencong Tang,Yuxiang Lin,Minmin Mao,Kaixin Song
Dielectric polymer nanocomposites with low ceramic filler loadings are generally regarded as beneficial for suppressing conduction loss and enhancing breakdown strength. However, this conventional assumption overlooks the critical role of filler spatial distribution in governing microscopic electric field uniformity. In this work, 0.6(0.82Bi 0.5 Na 0.5 TiO 3 -0.18Bi 0.5 K 0.5 TiO 3 )-0.4SrTiO 3 (BNKT-ST) lead-free ceramics were synthesized and surface-modified with the silane coupling agent γ-aminopropyltriethoxysilane (KH550). The modified nanoparticles were then incorporated into a poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) matrix to fabricate a series of dielectric nanocomposite films with systematically varied filler contents (0.5–3 wt%). X-ray diffraction (XRD) and Fourier transform infrared (FTIR) confirmed the target perovskite phase of BNKT-ST and the coexistence of α and β phases in the polymer matrix. By combining quantitative image-based analysis of filler dispersion and microscopic electric field simulations, the spatial distribution of KH550@BNKT-ST nanoparticles in the P(VDF-HFP) matrix was systematically clarified: at excessively low filler loadings (≤ 1 wt%), nanoparticles were sparsely and unevenly dispersed; at a critical filler concentration of ~1 wt%, a continuous and spatially uniform insulating network was formed by the nanoparticles; while at higher filler loadings (> 1 wt%), slight agglomeration of nanoparticles occurred. A nonmonotonic dependence of breakdown strength on filler concentration was revealed. The continuous network at ~1 wt% effectively homogenized the local electric field, maximizing breakdown strength at 440 MV/m and an energy density of 8.97 J/cm 3 . This study demonstrates that low ceramic filler content does not inherently guarantee superior dielectric performance, and highlights the necessity of a critical filler threshold for achieving electric field homogenization in polymer-based dielectric nanocomposites. Highlights A nonmonotonic effect of filler content on breakdown strength is discovered. Quantitative analysis of filler dispersion is conducted to explain the mechanism. The underlying mechanism is revealed via phase-field simulation/analysis. The 1 wt% BNKT-ST/P(VDF-HFP) nanocomposite shows superior performance. This work provides guidance for designing high-energy-density dielectrics.
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Functional Materials Letters
·
2019
·
IF 1.388
Lin Zhao,Yanzhao Xie,Qiuyu Lin,Rongze Zheng,Yong Diao
A series of composite catalysts of C, N and P co-doped TiO 2 were prepared by sol-gel method, using a biomass (soluble starch) dopant. The samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), fourier transform infrared (FTIR) spectroscopy. The results show that TiO 2 is co-doped with C, N and P by one step. The resulting composite exhibited higher specific surface area, wider visible-light absorption band with respect to the pure TiO 2 . The sample calcined at 400 ∘ C for 2 h with a doping amount of 6 g soluble starch showed the best electrochemical performance. The C, N and P co-doped TiO 2 was also used for the degradation of methylene blue (MB) and degradation ratio was up to 98% in 80 min under visible light irradiation.
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INORGANIC CHEMISTRY
·
2026
·
IF 4.7
Yuguo Feng,Caikang Wang,Xueting Wang,Zhijuan Li,Liang Liu,Zihan Zhou,Zhe Xu,Xuanxiao Zhu,Meng Li,Dongmei Sun,Yawen Tang
The development of highly active and durable electrocatalysts for the alkaline hydrogen evolution reaction (HER) is essential for advancing sustainable hydrogen production through anion exchange membrane water electrolysis (AEMWE). In this work, we report the one-pot solvothermal synthesis of Ga-doped Ru nanosheets (RuGa NSs) as a high-performance alkaline HER catalyst, where Ga incorporation is shown to optimize the interfacial water structure to enhance catalytic activity. The optimized RuGa NSs exhibit outstanding alkaline HER performance, requiring a low overpotential of only 18 mV at 10 mA cm–2, coupled with a small Tafel slope of 37.2 mV dec–1. When integrated into an AEMWE device, the RuGa NSs||NiFe-LDH-based AEMWE enables a low cell voltage of 1.74 V to deliver 1.0 A cm–2 in 1.0 M KOH at 60 °C. Moreover, the AEMWE device shows exceptional long-term stability, operating continuously for 200 h at 0.5 A cm–2 with a minimal voltage decay of 5.5%. Operando Raman spectroscopy results demonstrate that Ga doping promotes the dynamic transformation of rigid, hydrogen-bonded water into more mobile free-water molecules. This restructuring creates a favorable local reaction environment by increasing the flexibility of the hydrogen-bond network, thereby facilitating water dissociation and proton transfer.
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高影响因子
Polymers
·
2019
·Vol. 11
·期 12
·
IF 3.164
Tingting Chen,Xingqin Fu,Luzi Zhang,Yuejun Zhang
The poly(acryloyloxyethyl trimethyl ammonium chloride–co–acrylamide), P(DAC-AM), is a kind of cationic polyelectrolyte usually applied in a solution form, and its performance is affected by its structure and the environment where it is used. In particular, its viscosity properties in salt solutions are directly related to its efficacy in various applications, and the performance is one of the most important solution properties. Therefore, in this paper, the effects of the salt concentration and valence of seven kinds of inorganic salts, NaCl, LiCl, KCl, MgCl2, AlCl3, Na2SO4, and Na3PO4, on the values of apparent viscosity (ηa) of P(DAC-AM) samples with cationicity of 10%, 50%, and 90%, and intrinsic viscosity ([η]) of 5, 10, and 15 dL/g were investigated. Theηawas determined using a rotational viscometer. The interaction mechanism between the polymers and salt ions was also investigated. The results showed that depending on the salt concentration, theηafirstly decreased sharply to the inflection point which indicated the minimum volume of the molecule shrinking, and then either maintained the value unchanged or increased. The salt concentration corresponding to the inflection point decreased with the increase of the salt ion valence but with the reduction of the cationicity of the polymer. Theηaat the inflection point increased as the [η] of the polymer grew. This indicated that the salt concentration and the salt ion valence had a notable impact on the stretch of the cationic polymer molecule in the salt solutions. It was discovered that the phenomenon of the increase of theηaof P(DAC-AM) samples in the multivalent salt solutions after the inflection point was caused by not only the increase of theηaof the complexes formed from the pure salts, but also the viscosity resistance of the charge and volume between the polymer molecules and salt ions, as well as the complexes themselves. The linear relationship between the increasedηaand the salt concentration, representing the interaction both among the complexes themselves and between the polymer and complexes, was obtained. Furthermore, the interaction model between the salt ions and P(DAC-AM) molecules in a wide range of salt concentrations was illustrated.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2011
·
IF 2.089
Xiqian Li,Xiao Zhou,Jun Mu,Lijun Lu,Dachuan Han,Chunmei Lu,Mingtai Wang
We have studied the adsorption of p-aminophenol on poly(aryl ether ketone) containing pendant carboxyl groups (PEK-L). The pH effect, adsorption kinetics, isotherms, and thermodynamics are investigated in batch experiments. The kinetics of the adsorption follows a pseudosecond-order model. Langmuir and Freundlich isotherms are employed to describe the adsorption process, indicating that the former fits the data better. The thermodynamic functions, ΔG°, ΔH°, and ΔS° are calculated. The method is applied to the determination of p-aminophenol in drug tablet samples, and the accuracy is assessed through recovery experiments.
研究领域:
环境化学
·
高分子科学
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吸附科学
·
化学工程
·
分析化学
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Süreyya Oğuz Tümay,Vildan Sanko,Ahmet Şenocak,Yasin Orooji,Erhan Demirbas,Yeojoon Yoon,Alireza Khataee
Phenolic compounds that are naturally found in food samples are not only an important part of the human diet but also useful bioactive substances for health. Among these, para- coumaric acid ( p- CA) has antibacterial and antioxidant properties and is used in many industrial processes. In this study, the novel MAX-phase material, Nb 4 AlC 3 , was successfully prepared and characterized in detail with various spectroscopic, microscopic and thermal techniques. The sensor performance of Nb 4 AlC 3 modified glassy carbon electrode (Nb 4 AlC 3 @GCE) was evaluated and analytical parameters were calculated. Experimental conditions such as pH and amount of modifier were optimized with differential pulse voltammetry (DPV) measurements. The real samples analyses of lemon, apple and pomegranate were applied for determination of p- CA with Nb 4 AlC 3 @GCE sensing system under the optimized conditions. The accuracy was evaluated by spike/recovery and high-performance liquid chromatography analysis, which accounted for high accuracy of the Nb 4 AlC 3 @GCE sensing system. The limit of detection, limit of quantification, linear working range and relative standard deviation (%) of the Nb 4 AlC 3 @GCE sensing system were determined as 0.28 and 0.85 µmol/L, 0.8–80.0 µmol/L, 3.17 %, respectively. The results showed that the proposed sensing system has the high precision at lower concentration of p- CA.
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