CHIRALITY
·
2025
·Vol. 37
·期 11
·e70060
·
IF 3
Shuling Dong,Jiayi Sun,Fan Ding,Ji Wu,Ronghua Fan,Li Zhou
In this work, a new strategy was proposed for the preparation of a chiral stationary phase based on β-cyclodextrin and calix[4]arene polymer. The chiral stationary phase was characterized by scanning electron microscopy, energy dispersive x-ray spectroscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The introduction of calix[4]arene polymer increased chirality recognition by increasing recognition sites and interactions, including hydrogen bonding, π–π interaction and synergistic inclusion effect. Compared with the home-made β-cyclodextrin–based chiral column, the prepared β-cyclodextrin–calix[4]arene polymer-based chiral column showed superior enantioseparation performance toward 1-phenylethanol, prothioconazole, promethazine, propranolol, and bisoprolol. These chiral compounds can be separated within 10 min under reversed-phase mode with resolutions ranging from 1.62 to 1.80. These findings will provide an important reference for developing novel supramolecule-based chiral stationary phases.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Zikang Hou,Baogang Zhang,Xia Li,Yuanjie Liang
Tailoring a highly active interlayer in Pd electrodes is critical for determining electrode performance and stability. In this study, an active Cu-porphyrin interlayer is electrodeposited onto the sponge nickel (SN) skeleton. The modified sponge nickel is subsequently used to support Pd particles and fabricate an effective Pd/Cu-P/SN composite electrode. Compared with the initial Pd/SN electrode, the increase in dechlorination efficiency is 3.59 times for the Pd/Cu-P/SN electrode. Furthermore, substantial improvements in both mass activity and current efficiency are achieved, with respective increases of approximately 14.2-fold and 4.2-fold relative to the untreated electrode. These significant enhancements are ascribed to the well-designed active Cu-porphyrin interphase. Specifically, the Cu-porphyrin interlayer on the SN skeleton provides an enlarged specific surface area, thus accommodating a greater dispersion of Pd particles. Additionally, the confinement of Pd particles on Cu-porphyrin regions leads to the establishment of Pd Cu interfaces, and this interfacial intimacy expedites the evolution of active hydrogen, leading to a high electrocatalytic removal rate even at an elevated 4-chlorophenol concentration. The Pd/Cu-P/SN composite electrode presented here shows a great application potential for the electrocatalytic treatment of organic chlorophenol wastewater, which also paves a new avenue for enhancing electrode properties through rational introducing of metal-porphyrin interphase.
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Journal of Environmental Chemical Engineering
·
2019
·
IF 0
Alemtsehay Tesfay Reda,Dongxiang Zhang
Selective Removal of metal ions from simulated wastewater by sulfonated calix[4]arene intercalated with layered double hydroxide (SC4A-NO 3 -LDH) is reported in the present paper. The SC4A-NO 3 -LDH exhibited high adsorption performance towards metal ions with selectivity order of Fe(III) > Cu(II) > Pb(II) > Ag(I) for heavy metal ions, and Eu(III) > Nd(III) > La(III) for rare earth metal ions. Kinetics of Fe 3+ , Cu 2+ and Eu 3+ were found to follow pseudo-second-order reaction, suggesting chemisorption mechanism. Efficient sorption, with 100% removal rate and 3.80 × 10 7 mL/g distribution coefficient ( K d ) towards Fe(III) is typical potential of SC4A-NO 3 -LDH. For Cu 2+ and Eu 3+ ions sorption, K d values of 1.03 × 10 6 and 7.25 × 10 6 mL/g, and removal rates of 99.88 and 99.98%, respectively, were obtained. 0.005 g of SC4A-NO 3 -LDH was enough to lower 2.6 ppm of Fe 3+ –< 1 ppb. After the sorption, samples were characterized by analytical methods such as X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform Infrared spectroscopy (FTIR) and proved that the target ions on their respective samples. XRD and FTIR were also used to check the stability of the samples after sorption.
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PLoS One
·
2021
·Vol. 16
·期 9
·e0255504
·
IF 3.24
Jing Zhang,Zhou-Tao Pei,Ya-Ni Zhao,Meng Zhang,Li-Ling Zhang,Wen-Qiang Wang,Jing-Ya Wu,Ran Yu,Li-Wei Sun
Benzophenone (BPs) and 4-Methylbenzylidene Camphor are used as ultraviolet (UV) filters to protect the skin and hair in personal care products. The discharging of the three chemicals may endanger the receiving water ecosystem. In the present study, the mutagenicity of BP-6, BP-8, and 4-Methylbenzylidene Camphor was tested using the Salmonella typhimurium reverse mutation test (Ames test) in the system with and without rat liver microsomal preparations (S9). Four S . typhimurium strains, TA97, TA98, TA100, and TA102 were employed in the Ames tests. The mutagenicity was detected from all three chemicals. The addition of S9 increased the mutation ratios of three chemicals to four strains, except BP-6 to TA100 strain and 4-MBC to TA97 and TA98 strain. In the mixed experiment, all positive effects were detected in the absence of S9. However, the results all became negative in the presence of S9. For the mixture of BP-6 and 4-MBC, positive results were detected on four tester strains except for the TA100 strain. For the mixture of BP-6, BP-8, and 4-MBC, positive results were detected on four strains. The mixture test results showed antagonism in mutagenicity for the mixture of BP-6 and 4-MBC to TA98 and TA100 strains and the mixture of BP-6, BP-8, and 4-MBC to TA100 and TA102 strains.
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Catalysts
·
2021
·Vol. 11
·期 11
·1336
·
IF 4.146
Xiaolong Zhang,Lei Chen,Yang Liu,Qian Duan
Composite nanostructure materials are widely used in catalysis. They exhibit several characteristics, such as the unique structural advantage and the synergism among their components, which significantly enhances their catalytic performance. In this work, CoPt nanoparticles and reduced-graphene-oxide-based nanocomposite catalysts (rGO/CoPt, rGO/CoPt/Ag) were prepared by using a facile co-reduction strategy. The crystalline structure, morphology, composition, and optical characteristics of the CoPt nanoparticles, rGO/CoPt nanocomposite, and rGO/CoPt/Ag nanocomposite catalysts were investigated by a set of techniques. TheID/IGvalue of the rGO/CoPt/Ag nanocomposite is 1.158, higher than that of rGO/CoPt (1.042). The kinetic apparent rate constant, k, of the rGO/CoPt/Ag nanocomposite against 4-nitrophenol (4-NP) reduction is 5.306 min−1, which is higher than that of CoPt (0.495 min−1) and rGO/CoPt (1.283 min−1). The normalized rate constant, knor, of the rGO/CoPt/Ag nanocomposite is 56.76 min−1mg−1, which is higher than some other catalytic materials. The rGO/CoPt/Ag nanocomposite shows a significantly enhanced catalytic performance when compared to CoPt nanoparticles and the rGO/CoPt nanocomposite, which may confirm that the novel rGO/CoPt/Ag nanocomposite is a promising catalyst for the application of catalytic fields.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Dong Zhang,Ping Yan,Hong Yu,Jing Sun,Shuyun Zhu,Xian-En Zhao
Development of accurate, convenient and portable methods for monitoring 4-aminophenol (4-AP) is extremely important because of its strong toxicity. Here, a ratiometric fluorescence sensor based on Ag + -enhanced luminescence of Tb-DNA complexes has been presented for the detection of 4-AP. The luminescence of Tb-DNA complexes is enhanced about 30 times by Ag + , which can trigger energy transfer from DNA to Tb 3+ more efficiently. In the presence of 4-AP, Ag + can be reduced into Ag 0 owing to its strong reducibility, inducing the decrease of Tb-DNA complexes at 545 nm remarkably. Besides, 4-AP exhibits intrinsic fluorescence at 375 nm under the same conditions. Therefore, ratiometric detection of 4-AP can be achieved using F 375 /F 545 as readout with a detection limit of 0.4 μM. Real water samples have been tsted to evaluate this method in practical application and satisfactory results have been obtained. Furthermore, the addition of 4-AP into Tb-DNA-Ag + system induces a visible color variation from green to bluish violet, enabling visual detection of 4-AP under the assistance of a smartphone.
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LANGMUIR
·
2025
·
IF 3.9
Caiwen Pan,Qinghong Shi,Xiaoyan Dong,Linling Yu,Yan Sun
Effective degradation and detoxification of the highly toxic organophosphate pesticide methyl parathion (MP) are important for pollution treatment and sustainable development. Enzymatic hydrolysis of MP by organophosphate hydrolase (OPH) is an effective way. However, hydrolytic product 4-nitrophenol (4-NP) remains environmentally hazardous. A promising strategy is to reduce 4-NP to 4-aminophenol (4-AP), which not only is weakly toxic but also has high application value. To realize the cascade conversion of MP to 4-AP with the dual objectives of detoxification and recycling, we designed a chemoenzymatic catalyst by immobilizing the OPH within a reduction-catalytic nanocomposite (NCu) constructed by generating copper nanoparticles (Cu NPs) in a zirconium-based metal–organic framework, NU-1000. Optimized OPH@NCu exhibited a 239% enhancement in catalytic activity compared to free OPH, attributed to substrate enrichment by NCu and activation of OPH by Cu2+. Moreover, OPH@NCu exhibited an average cascade conversion rate of 11.1 μmol min–1 gcatalyst–1, achieving a complete conversion of 50 μM MP to 4-AP within 9 min by using a low reductant concentration (15 mM NaBH4). Notably, OPH@NCu demonstrated robust stability, retaining >86% of its activity after being stored for 10 days and nearly 80% of its activity over six reuse cycles. These results validate OPH@NCu as an efficient and sustainable platform for the cascaded detoxification and recycling of MP.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Liang Zeng,Qilin Wang,Xinyi Lou,Chang Peng,Ruoxi Wu,Shu Chen
Responsive catalysts with self-healing response capabilities will have great potential in sustainable catalytic applications, effectively extending the lifespan of catalysts. Herein, a near-infrared-responsive self-repairing composite gel catalyst is presented for efficient and sustainable reduction of 4-nitrophenol (4-NP, i.e., a specific organic pollutant). Copper nanoparticles (CuNPs) serve as catalytic species, while transition metal carbide (Ti 3 C 2 T x ) acts as efficient electron transfer medium in the composite gel. The synergistic effect of these components significantly enhances catalytic activity of the gel (e.g., the catalytic rate constant k for 4-NP reduction reaches up to 0.6159 min −1 ). More importantly, by leveraging the self-healing of poly(N, N-dimethylacrylamide) (PDMAA, i.e., the third component in the gel) and combining the photothermal conversion of Ti 3 C 2 T x , the gel is endowed with the ability to rapidly repair itself by near-infrared light induction, thereby ensuring its sustainability in the catalytic application. This photo-induction way not only effectively repairs the damaged gel catalyst but also preserves its catalytic efficiency, making it ideal for prolonged application. This research offers novel insights into using responsive catalysts to achieve sustainable and efficient catalytic application.
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INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Jing Cao,Kejun Chen,Fangmei Teng,Jialing Liu,Xinyi Liu,Cen Zhang
Maximizing the exposure of edge sites and achieving sufficient promotion remain arduous tasks for designing efficient bimetallic MoS2-based catalysts. Herein, ultrathin CoMoS nanosheets vertically grown on reduced graphene oxide (CoMoS/rGO–DMF) were fabricated by a facile one-pot solvothermal method using dimethylformamide (DMF) as solvent. The vertically aligned structure and good Co promotion endow CoMoS/rGO–DMF with abundant Co–Mo–S active sites and excellent catalytic performance in the hydrodeoxygenation (HDO) reaction. Consequently, CoMoS/rGO–DMF afforded a conversion of 98.2% and a toluene selectivity of 98.8% at 240 °C, 3.0 MPa, and 4 h in the HDO of 4-methylphenol. In addition, CoMoS/rGO–DMF showed a 3-fold larger turnover frequency value than that of CoMoS/rGO–DW prepared in deionized water. The reusability test of CoMoS/rGO–DMF showed a slight activity loss after six catalytic cycles, which resulted from the surface oxidation by water product, but the HDO performance of the spent catalyst can be easily regenerated by a simple sulfidation process. This work provides new insights for the rational design of sulfide catalysts with excellent HDO activity and arene selectivity.
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TRIBOLOGY LETTERS
·
2025
·Vol. 73
·期 4
·1-16
·
IF 3.3
Sheng Dezun,Yu Hongliang,Zhang Xiao,Zhou Xin
Reducing alloy friction to achieve ultra-low friction is a valuable approach to save energy and reduce pollution from oil use, which is a major challenge for researchers. This study introduces a successful method to achieve ultra-low friction in Ti-6Al-4 V using a hydrated lubricant composed of hydroxyethyl cellulose (HEC). And the effects of speed and concentration on lubricating were investigated. It was found that excessive sliding speeds may lead to lubricant detachment and consequent friction increase, indicating that the adsorption ability of HEC needs to be enhanced in future studies. In addition, when the concentration exceeds 5 wt%, wear loss tends to stabilize across tests with different concentrations, while the friction force increases with rising concentrations. Based on these findings, microscopic studies were conducted to investigate the mechanism of friction reduction. Notably, distinct topographic features resembling ‘valleys’ and ‘plateaus’ were identified on the wear scars in a nanoscale scope. The movement of the surfaces induces the hydrated HEC lubricant to flow from the lower valleys to the higher plateaus, suggesting elastohydrodynamic lubrication mechanisms to form robust films. The valleys serve as lubricant reservoirs, while the plateau tops support the lubricant films to prevent contacts between Ti-6Al-4 V and Si 3 N 4 . The schematic illustrations depict the microscopic mechanisms for achieving of ultra-low friction on Ti-6Al-4 V alloy.
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Journal of Analytical Methods in Chemistry
·
2015
·Vol. 2015
·期 1
·387207
·
IF 0.792
Ying Liang,Yingming Pan,Qing Guo,Hongzhi Hu,Chancui Wu,Qian Zhang
A novel fluorescent reagent for determination of ammonium, 4-methoxyphthalaldehyde (MOPA), was successfully synthesized in this study. Under alkaline conditions, MOPA could reacted with ammonium rapidly at room temperature, producing fluorescent substance which had maximum excitation at 370 nm and emission wavelength at 454 nm. Based on this, a novel fluorescence analysis method was established for the determination of trace ammonium in natural water. Experimental parameters including reagent concentration, pH, reaction equilibrium time, and metal ions masking agent were optimized. The results showed that the optimized MOPA concentration was 0.12 g/L, pH was in the range of 11.2–12.0, and sulfite concentration was 0.051 g/L, respectively. Metal ions masking agent had no obvious effect on the fluorescence signal. With the reaction time of 15 minutes, linear range of this method was between 0.025 and 0.300 μ mol/L, and the method detecting limit was 0.0058 μ mol/L. The matrix recovery of the proposed method was in the range of 93.6–108.1%. Compared with the OPA method, this method was much more sensitive and rapid without the interference of background peak and would be more suitable for developing a portable fluorescence detection system.
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CANADIAN JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 1.9
Yu-cheng Jiang,Bao-guang Zhu,Xiang-li Long
The oxidation of 1-(4-chlorophenyl)-pyrazolidin-3-one to 1-(4-chlorophenyl)-1H- pyrazol-3-ol by air can be accelerated by the Co(II)@AC catalyst prepared by loading Co(II) on activated carbon with wet impregnation method. ZnCl 2 solution has been used to treat activated carbon to ameliorate the catalytic ability of Co(II)@AC catalyst. The experiments indicate that the optimal catalyst is made by immersing activated carbon in 0.7 mol/L ZnCl 2 solution at 50°C for 6 h with a liquid/solid ratio of 30/1 (mL/g) followed being calcined at 700°C for 5 h at a heating rate of 5°C/min under N 2 protection. The 1-(4-chlorophenyl)-1H-pyrazol-3-ol concentration catalyzed by the catalyst loaded on the best carbon reaches 0.01953 kg/L, which is 27.56% higher than that catalyzed by the catalyst loaded on the original carbon. The characterization results manifest that the modification with ZnCl 2 enriches the porous structure and increases the acidic groups on the surface of activated carbon. The conversion of 1-(4-chlorophenyl)-pyrazolidin-3-one is mainly determined by the physical structure of the activated carbon while the selectivity to 1-(4-chlorophenyl)-1H- pyrazol-3-ol is largely affected by the chemical characteristics of the activated carbon.
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