JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
·Vol. 100
·期 1
·243-254
·
IF 2.8
Cui Quan,Yingying Zhou,Hua Chu,Xiaolei Fan,Ningbo Gao
BACKGROUND Ethyl lactate produced via esterification between lactic acid and ethanol can be used in plastics, polymers and food industries and renowned for its biodegradability and low toxicity. However, lactic acid self-catalyzed esterification presents a slow reaction process, and acid catalysts are needed to improve the catalysis. Homogeneous acid catalysts like H 2 SO 4 are corrosive, as well as being difficult to be seperated from the reaction media; therefore, advanced heterogeneous catalysts are more ideal. In this study, two kinds of heteropolyacid–zeolite catalysts, involving loading silicotungstic acid and phosphotungstic acid onto Y zeolite, were synthesized, characterized using X-ray diffraction, NH 3 temperature-programmed desorption and scanning electron microscopy and analyzed for their catalytic efficiency in the catalytic esterfication. RESULTS Results showed that the Keggin structures of heteropolyacids were retained during the preparation process and strong acid sites of Y zeolite were enriched, which made the main contribution to the esterification of lactic acid and ethanol. Furthermore, the initial-stage reaction rate of esterification was significantly enhanced. During the first hour of esterification, the conversion of lactic acid increased from 18% to 65%. Exp Dec1 index model was employed to determine the activation energies of 60HSiW-Y and 60HPW-Y, which exhibit values of 29.3 and 28.2 kJ mol −1 , respectively. CONCLUSION This study indicates that Keggin structures of heteropolyacids play a key role in the esterification and heteropolyacid–zeolite catalysts can effectively catalyze the esterification. Meanwhile, the results of the kinetic experiments can be of reference significance for large-scale industrial processes involving esterification. © 2024 Society of Chemical Industry (SCI).
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JOURNAL OF INCLUSION PHENOMENA AND MACROCYCLIC CHEMISTRY
·
2017
·Vol. 90
·期 1
·149-155
·
IF 1.095
Dong Peng,Li Zeyu,Ji Dong,Wang Xiaorui,Yun Hongfei,Du Zhisong,Bian Jie,Li Guixian
Modified Y type catalyst (M-Y) shows great potential for the preparation of toluene attribute to catalyst topology and synergistic effect of Lewis acid and Brönsted acid in the alkylation reaction. However, it still remains a big challenge to build a reaction mechanism. Thereby, based on the study of HZSM-5, H-beta and M-Y catalysts structure and physical properties, a plausible reaction mechanism was proposed. The samples were characterized by X-ray diffraction, N 2 adsorption/desorption, Fourier transform infrared absorption spectra and Pyridine adsorption infrared. The activity of catalysts was tested in benzene alkylation with methanol and was found to be in the following increasing order: Na-Y (no effect) < H-Y << HZSM-5 < H-beta < M-Y.
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INTERNATIONAL DENTAL JOURNAL
·
2024
·
IF 3.2
Yunxiao Du,Guobin Li,Xinglin Li,Xiaohong Jian,Xiaoling Wang,Yongmei Xie,Zaixin Li,Zhi Zhang
Objective The purpose of this work was to develop an anti-CAT-SYI immunoglobulin Y (IgY) antibody that targeted both GtfB (glucosyltransferase B) and GbpB (glucan-binding protein B) and test its anticaries properties in rats. Methods A new CAT-SYI fusion gene was created utilising functional DNA fragments from the GtfB and GbpB genes. The recombinant antigens, comprising the fused CAT-SYI antigen, GtfB, and GbpB, were expressed and purified using a prokaryotic expression and purification system. The purified recombinant antigens were utilised to immunise laying hens against particular IgY production. The biological activities of these particular IgY antibodies were then assessed both in vitro and in vivo, including their capacity to suppress biofilm formation and tooth caries. Results Results indicated that these produced IgY antibodies demonstrated a high antibody titer (>0.1 μg/mL) and could precisely recognise and bind to their respective antigens. Furthermore, it was discovered that these specific IgY antibodies successfully bind to Streptococcus mutans and significantly reduce biofilm development. After 8 weeks of ingesting antigen-specific IgY meals, comprising anti-GtfB IgY and anti-GbpB IgY, the severity of dental caries was dramatically reduced in S mutans– infected Sprague-Dawley rats ( P < .01). Anti-CAT-SYI IgY therapy significantly reduced tooth cavities by 89.0% in vivo ( P < .05) compared to other treatment groups. Conclusions The anti-CAT-SYI IgY, a multitarget antibody that targets both GtfB and GbpB, displayed excellent inhibitory effects against S mutans , making it a promising targeted method with improved anticaries efficacy and significant application opportunities.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.9
Haoda Zhang,Peng Deng,Zhou Wang,Yuxuan Bai,Yongjin Li
A facile rapid-combustion process was introduced for preparing magnetic CoxMgyCu(1-x-y)Fe2O4 nanoparticles, and to enhance their specific surface area and saturation magnetization, the optimization involved adjusting the element proportion, calcination temperature, and solvent amount. The optimal element proportion of x:y:(1-x-y) for CoxMgyCu(1-x-y)Fe2O4 nanoparticles was 0.1:0.7:0.2, and the effects of solvent amount, and calcination temperature were also investigated. The average particle size and specific surface area of Co0.1Mg0.7Cu0.2Fe2O4 nanoparticles calcined at 400 °C with 25 mL absolute alcohol were 17.9 nm and 56.96 m2/g, respectively; while demonstrating a saturation magnetization of 8.5 emu/g. To solve the increasingly severe issue of water pollution, these nanoparticles were employed to efficiently treat dye wastewater containing methyl blue (MB). After fitting kinetic and isotherm models, the adsorption process of magnetic Co0.1Mg0.7Cu0.2Fe2O4 nanoparticles for MB dominated by chemisorption and was a multilayer adsorption process. The adsorption isotherm experiments revealed a remarkable maximum adsorption capacity of methyl blue, reaching 2255.7 mg/g, within the concentration range of MB from 400 to 4000 mg/L. The thermodynamic analysis indicated the spontaneity of the exothermic adsorption process. The studies on the effect of pH also led to satisfying results; while the residual adsorption capacity could still remain 91.2% initial adsorbance after 12 times recycle. The outstanding recycling ability, resistance to ionic strength, and pH resistance distinguished the magnetic Co0.1Mg0.7Cu0.2Fe2O4 nanoparticles among vast adsorbents. These results highlight the significant potential of these nanoparticles for treating dye wastewater.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Hezheng Sun,Guoqing Liu,Yi Zhao,Jingcun Shao,Changhui Xin,Yanting Tang,Xin Yu
Bisphenol A is an environmental hormone that shows a significant impact on human health. The removal of bisphenol A substances from the surrounding environment is of great significance for the humanity sustainable development. Current work focuses on synthesizing self-doped Nb 3 O 7 (OH) nanostructure and eosin Y/Nb 3 O 7 (OH) composites with high surface areas through a solvothermal process for bisphenol A degradation under visible-light illumination. The prepared Nb 3 O 7 (OH) sample demonstrated a noticeable photocatalytic performance toward bisphenol A degradation. Notably, the obtained eosin Y/Nb 3 O 7 (OH)-1.0 % composite not only exhibited efficient visible-light harvesting and high surface area but also showed significantly improved charge separation and bisphenol A degradation compared to pristine Nb 3 O 7 (OH) sample. The rate constant of the eosin Y/Nb 3 O 7 (OH)-1.0 % sample for bisphenol A degradation was approximately 0.04252 min −1 , which was 7.85 times that of pristine Nb 3 O 7 (OH) sample. Furthermore, the eosin Y/Nb 3 O 7 (OH)-1.0 % composite achieved approximately 59.76 % mineralization of bisphenol A within 20 min and 75.28 % mineralization within 40 min under visible-light illumination. Additionally, the effects of experimental parameters on bisphenol A degradation and the dye-sensitization mechanism were proposed. The current work suggests the obvious advantages of defective Nb 3 O 7 (OH) nanostructure in fabricating high-performance composite photocatalysts for eliminating emerging pollutants.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Xianyi Jiang,Zilong Deng
In this study, we designed a microfluidic configuration incorporating with a directional channel perpendicular to the main channel before a Y-junction, enabling precise control over droplet splitting by adjusting the directional flow rate. Our experiments revealed four distinct flow regimes and the fitting formula accurately predicted the critical directional points in the flow regime map under different capillary numbers. Trajectory analysis of the solid cores demonstrated that their displacement within compound droplets is influenced by both the directional and main channel flow rates, and we proposed a theoretical model to accurately predict this displacement. Moreover, particle image velocimetry experiments are conducted to provide insights into the velocity field evolution across different flow regimes, highlighting the significant impact of flow rates on droplet deformation, splitting, and solid core movement. The results enhance the controllability of microfluidic systems and broaden their applicability in fields like biomedicine and chemical engineering.
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Small
·
2025
·
IF 12.1
Deguang Ji,Zi Yang,Yaxiong Yao,Yichao Hou,Zidong He,Pengfei Da,Wei Shen,Li An,Yuanmiao Sun,Pinxian Xi,Chun-Hua Yan
Copper-based catalysts show considerable promise in the electrochemical CO 2 reduction reaction (CO 2 RR) for the production of hydrocarbons and oxygenates, particularly methane (CH 4 ), which is a highly reduced product. The high-valent state of copper (Cu) exerts a positive influence on the formation pathway of CH 4 , but the reduction potential will lead to a decrease in the valence state during CO 2 RR. In this study, a highly crystalline and structurally well-defined Y 2 Cu 2 O 5 catalyst is constructed to stabilize Cu 2+ with the orderly alternating Y─O skeleton layer, owing to the strong bonding interaction. The Y 2 Cu 2 O 5 exhibits a remarkable enhancement in CH 4 selectivity compared to CuO (up to 9.59-folds), achieving a selectivity of 61.3% at 300 mA cm −2 and 58.4% at 400 mA cm −2 , together with good stability. In situ attenuated total reflectance Fourier transform infrared spectra (ATR-FTIR) and density functional theory (DFT) calculations reveal that the presence of the Y─O skeleton layer in Y 2 Cu 2 O 5 significantly enhances the adsorption of *CO intermediate, and accelerates its hydrogenation process, facilitating the conversion of CO 2 to CH 4 . This work highlights Y─O skeleton-mediated stabilization of Cu 2+ for efficient electroreduction of CO 2 to CH 4 , providing valuable insights into the design of efficient electrocatalysts for CO 2 conversion.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Xiao-Ming Peng,Yu-Feng Hu,Jin-Zhu Zhang,Zhi-Xin Wang,Zhe-Yu Li,Chao Miao
Viscosities were measured for the ternary systems Y(NO3)3 + Ce(NO3)3 + H2O, Y(NO3)3 + Nd(NO3)3 + H2O, and Ce(NO3)3 + Nd(NO3)3 + H2O and their binary subsystems Y(NO3)3 + H2O, Ce(NO3)3 + H2O, and Nd(NO3)3 + H2O at (293.15, 298.15, and 308.15) K and atmospheric pressure. The results were used to test the applicability of simple equations for the viscosity of mixed solutions. The predictions agree well with measured values, implying that the viscosities of the examined electrolyte solutions can be related to those of their constituent binary solutions using these simple equations.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Tuo Zheng,Haiyan Fan,Jia Zhao,Jile Fu,Songshou Ye,Sajid Ali,Nuowei Zhang,Jinbao Zheng,Binghui Chen
In diesel adsorption desulfurization, the coordination bonding between the adsorbent and sulfur compounds is interfered by aromatic compounds in diesel. Transition metal cation exchanged zeolites Y has exhibits exceptional anti-interference performance. In this work, the influence of electron configuration on coordination bonding is explored, specifically between the adsorbent and substrate, using both experimental and DFT theoretical methods. Initially, NiY, CuY and ZnY were synthesized and evaluated for their desulfurization performance in model solution (sulfur content: 25 ppmw dibenzothiophene [DBT]) with two toluene concentrations (1 w% and 3 w%). It is found that CuY showed the highest performance with retention rate at 70.2 %. Subsequently, DFT calculations revealed the binding energy between Cu(II) and DBT was −2.71 eV, higher than Ni(II) and Zn(II), and that between Cu(II) and toluene was −1.75 eV, lower than Ni(II) and Zn(II), indicating that the highest binding energy difference was responsible for the best adsorption capability. Apart from these, wave function analysis show the electron configuration between Cu(II) and DBT had the highest binding energy difference. Finally, the impact of electron configuration on adsorption performance is further investigated by modulating the electron configuration of Ni(II) to enhance/suppress its adsorption capability. According to the findings of this study, tuning the electron configuration is an effective strategy to develop materials in adsorptive desulfurization particularly for extra low sulfur content.
研究领域:
化学工程
·
材料科学
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SOLID STATE SCIENCES
·
2022
·
IF 3.752
Yuncheng Zhou,Qiuyu Cheng,Bin Li,Peng Jiang,Wenbin Cao,M.A. Subramanian
A new solid solution based on general formula Ba 4 In 2- x Mn x O 7+ y (0 ≤ x ≤ 0.2) has been successfully synthesized by the sol-gel method. The compounds exhibited grass green to olive colors. The origin of the color apparently due to the presence of Mn 4+ as a chromophore in square pyramidal coordination. The X-ray diffraction results showed that the space group of all samples is I 4/ mmm . The oxidation state of Mn ion is confirmed to be +4 from the results of magnetization measurements and X-ray photoelectronic spectra (XPS). The color of Ba 4 In 2 O 7 is white. With a small amount of Mn substitution, the color of Ba 4 In 2- x Mn x O 7+ y solid solution changes to grass green, and it turned to olive green when x = 0.2. The UV–Vis absorbance spectra revealed that the absorption peaks are fitted with d 3 (Mn 4+ ) configuration in the square pyramid, and the mechanism of color is explained.
研究领域:
材料科学
·
化学
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70407
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IF 3.8
Yuwei Zhang,Cuiwei Li,Guangjin Chen,Chenran Zhao,Zhikun Song,Kepi Chen,Haoran Sun,Linghao Wu,Junhui Xiang
A series of (Y, Yb, Zr, Hf, Sn, W)O 2−δ high-entropy ceramics with varying mole fraction of main elements were synthesized for the first time through the solid-state reaction synthesis method. The microstructure, phase composition, and properties of the prepared materials were thoroughly analyzed and tested. The results indicate that the phase composition transformed from a single-phase fluorite structure to a single-phase C-type rare earth sesquioxide structure as the mole fraction of +3 cations increases. The thermal conductivity of the prepared high-entropy ceramics with porosity of 49.8%–50.1% is very low ranging from 0.33 to 0.37 W·m −1 ·K −1 . Among them, the single-phase C-type rare earth sesquioxide with a higher oxygen vacancy concentration was employed as a catalyst in the CO 2 hydrogenation reaction, attaining a high CO 2 conversion rate of 82.0%. The obtained results have deepened understanding of the role of oxygen vacancies and have important guiding significance for the study of high-entropy oxides with fluorite derived structures.
研究领域:
材料科学
·
陶瓷
·
催化
·
能源材料
·
固态化学
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Materials
·
2026
·Vol. 19
·期 12
·2515
·
IF 3.7
Zhaohui Ma,Guoqing Yan,Xiao Yan,Haiyang Ding,Gang Wu,Shunli Zhang,Jiandong Zhang,Weidong Chen,Lijun Wang
HighlightsDynamic shift of oxygen mediator from Ca to metallic Y by increasing chlorine potential, explaining non-monotonic O variation in Zr.Establishment of three-phase equilibrium (Y–YOCl–YCl3) enabling in-depth deoxidation of Zr down to 20 ppm at 1173 K.Synergistic mechanism of O and Cl potentials clarified, providing a novel framework for designing efficient gettering systems.Zirconium (Zr) is a strategic metal resource whose performance is significantly degraded by high oxygen content. The external gettering process is an effective approach for in-depth deoxidation of Zr. In this study, the deoxidation behavior of Zr in the Ca-Y-CaCl2external gettering system was investigated by adjusting the chlorine potential through YCl3addition. The change of oxygen potential and its synergistic control mechanism during the variation of chlorine potential were systematically examined. The results demonstrated that with increasing chlorine potential, the system undergoes a sequence of reactions: chlorination of Ca, formation of metallic Y, formation of YOCl, dissolution of Y2O3, and formation of YCl3, ultimately reaching a three-phase equilibrium of Y-YOCl-YCl3. During this process, the oxygen content of Zr fluctuates notably, which is primarily attributed to the shift in the oxygen-transfer medium from Ca to Y. This transition changes the oxygen potential control mechanism from indirect Y-Ca control to direct Y control. After reaching equilibrium at 1173 K for 72 h, the equilibrium oxygen content of Zr initially remains stable with increasing chlorine potential, then gradually decreases, eventually reaching 20 ppmw. This trend is consistent with the mutual interaction of oxygen potential and chlorine potential. The findings provide important theoretical insights into the interaction between oxygen and chlorine potentials in deoxidation systems, elucidate the multi-element synergistic mechanism for oxygen control, and contribute to the design of efficient deoxidation systems.
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