CARBON
·
2023
·
IF 10.9
Bo Liu,Meijie Cai,Xiangling Feng,Siyu Lu,Song Lin,Feng Tian
Serial nanocomposites consisting of blue fluorescent carbon dots (B-CDs) and MgO nanoparticles were facilely prepared. Then on-site detection and degradation of ethyl-paraoxon were achieved and evaluated. It was revealed that ethyl-paraoxon was firstly decomposed into p-nitrophenol by MgO. Then, p-nitrophenol could significantly quench the fluorescence of decorated B-CDs due to an inner filter effect (IFE). The 0.05B-CDs@MgO showed excellent comprehensive performance among the serial xB-CDs@MgO samples due to its relatively high degradation ability towards ethyl-paraoxon and potent initial fluorescence emission intensity at an excitation wavelength of 360 nm between pH 4 and 10. Finally, based on the IFE, on-site paper sensors via color recognition app on a smartphone were explored compared with a conventional fluorescence spectrometer. Both the quantitative fluorescence intensities and G/B values showed the multi-piecewise linear correlations to ethyl-paraoxon concentration up to 3000 μg/mL in river water with a limit of detection to 0.06 μg/mL and 3.48 μg/mL as well as high recovery rates between 99%-102% and 95%–116%, respectively. The in vitro cytotoxicity and phytotoxicity assessment of the 0.05B-CDs@MgO revealed dose-dependent effects. Such portable and integrated fluorescent B-CDs@MgO nanocomposites on paper arrays show excellent potential in shortening the detection time and reducing the detection cost as a new strategy for the on-site quantitative detection and degradation of ethyl-paraoxon in actual river water.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Zijie Lu,Haokun Bai,Lanlan Liang,Shuo Chen,Hongtao Yu,Xie Quan
Heterogeneous catalytic ozonation (HCO) enables the destruction of organic pollutants in wastewater via oxidation by powerful hydroxyl radicals (·OH). However, the availability of short‐lived ·OH in aqueous bulk is low in practical treatment scenarios due to mass transfer limitations and quenching of water constituents. Herein, we overcome these challenges by loading MgO catalysts inside the pores of a tubular ceramic membrane (denoted as CCM) to confine ·OH within the nanopores and achieve efficient pollutant removal. When the pore size of the membrane was reduced from 1000 to 50 nm, the removal of ibuprofen (IBU) by CCM was increased from 49.6 % to 90.2 % due to the enhancement of ·OH enrichment in the nanospace. In addition, the CCM exhibited high catalytic activity in the presence of co-existing ions and over a wide pH range, as well as good self-cleaning ability in treating secondary wastewater. The experimental results revealed that ·OH were the dominant reactive oxygen species (ROS) in pollutant degradation, while surface hydroxyl groups were active sites for the generation of ·OH via ozone decomposition. This work provides a promising strategy to enhance the utilization of ·OH in HCO for the efficient degradation of organic pollutants in wastewater under spatial confinement.
研究领域:
环境科学
·
催化化学
·
废水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yanping Yang,Jin Wang,Junxia Wang,Xusheng Li,Yijie Tang,Kunqi Liu
MgO-Nd 2 Zr 2 O 7 (M-NZO) composite ceramics, as a promising material for inert matrix fuel (IMF), can be used to replace mixed oxide (MOX) fuel for consuming plutonium (Pu) storage and minor actinides (MA) in light water reactors (LWRs). In this study, the effect of Y doping and content of MgO on the thermophysical properties and mechanical performances of ω MgO-(1- ω )(Nd 1- x Y x ) 2 Zr 2 O 7 (M-NYZ) composite ceramics were systematically investigated. XRD, Rietveld refinement, and SEM-EDS results demonstrated that the as-prepared M-NYZ samples only consist of magnesium oxide and NYZ pyrochlore two phases, and with uniform element distribution and dense microtopography. In terms of properties, the thermal expansion coefficient and the thermal conductivity of 0.5M-0.5NYZ samples at 100–1200 °C is in the range of 13.1 × 10 −6 K −1 –13.5 × 10 −6 K −1 and 3.9 W⋅m −1 ⋅K −1 –15.9 W⋅m −1 ⋅K −1 , respectively. And the Vickers hardness, Young's modulus, and microhardness of typical samples are located in the range of 8.50–10.10 GPa, 183.35–275.32 GPa, and 7.03–10.52 GPa, respectively. Compared with UO 2 fuel, MOX fuel, and other ceramic IMFs, M-NYZ composite ceramics used for IMF exhibit comparable or even superior thermophysical and mechanical properties.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Shenxiao Li,Yong Men,Jinguo Wang,Shuang Liu,Xuefei Wang,Fei Ji,Shanshan Chai,Qiaoling Song
In this work, three novel MgO-SiO 2 composite catalysts with inverted structure have been synthesized via a facile and scalable strategy by means of the incipient wetness impregnation of the silica sol onto MgO precursors with different morphologies, and evaluated for the one-step conversion of ethanol to 1,3-butadiene. The prepared flower-like MgO-SiO 2 composite catalysts exhibited highly enhanced catalytic activity than those catalysts synthesized from MgO precursors with nanodisks and nanosheets morphologies. Characterization results based on XRD, FT-IR, UV–vis, BET, CO 2 -TPD, NH 3 -TPD, ethanol-TPD, and 29 Si MAS NMR revealed that unique layered flower-like architectures may facilitate the formation of interfacial Mg-O-Si chemical bond in binary MgO-SiO 2 composite catalysts which are mainly responsible for the superior activity. This study presents a new strategy to design and develop the catalyst for efficient conversion of bio-ethanol to 1,3-butadiene by morphological control of MgO-SiO 2 bifunctional catalysts.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yiming Wu,Jing Yang,Ruifeng Zhang,Hongji Li,Ruihua Mu,Yamei Zhao
Polyvinylidene fluoride (PVDF) membranes represent a potential technology for the in-depth treatment of organic dye-containing wastewater. Nevertheless, the intractable membrane fouling and the limited versatility have significantly constrained its applications. Herein, through the nonsolvent-induced phase inversion method, we have successfully fabricated the PDA@MgO/PVDF and PDA@ZnO/PVDF membranes, which are modified by the synergistic action of MgO or ZnO nanoparticles with polydopamine (PDA), respectively. Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), as well as the analyses of pore structure, contact angle, and surface free energy, were utilized to characterize the hybrid membranes. The results demonstrate that the modification of PDA@MgO and PDA@ZnO can enhance the hydrophilicity, pure flux, dye rejection, and pollution resistance of PVDF membranes. The enhanced hydrophilicity of the modified membranes results from the increase in surface free energy and its polar component term. Comparatively, the PDA@ZnO/PVDF membrane exhibits a smaller contact angle (69°) and a higher pure water flux (378.63 L/m2·h·bar), whereas the PDA@MgO/PVDF membrane possesses greater mechanical strength and better antifouling performance. The PDA@MgO/PVDF membrane can achieve a rejection rate of 94.6% for disperse deep blue 79, and the flux recovery rate can reach approximately 82%. This research offers novel insights into the application of PVDF membranes for the treatment of organic dye-containing wastewater.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jingrui Kang,Rui Gu,Xu Guo,Jing Li,Hongchen Sun,Leiyang Zhang,Ruiyi Jing,Li Jin,Xiaoyong Wei
NASICON-type structured compounds Li 1+ x M x Ti 2- x (PO 4 ) 3 (M = Al, Fe, Y, etc.) have captured much attention due to their air stability, wide electrochemical window and high lithium ion conductivity. Especially, Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) is a potential solid electrolyte due to its high ionic conductivity . However, its actual density usually has a certain gap with the theoretical density, leading the poor ionic conductivity of LATP. Herein, LATP solid electrolyte with series of SnO–P 2 O 5 –MgO (SPM, 0.4 wt%, 0.7 wt%, 1.0 wt%, 1.3 wt%) glass addition was successfully synthesized to improve the density and ionic conductivity. The SPM addition change Al/Ti–O bond and P–O bond distances, leading to gradual shrinkage of octahedral AlO 6 and tetrahedral PO 4 . The bulk conductivity of the samples increases gradually with SPM glass addition from 0.4 wt% to 1.3 wt%. Both SPM and the second-phase LiTiPO 5 , caused by glass addition, are conducive to the improvement of compactness. The relative density of LATP samples increases first from 0 wt% to 0.7 wt%, and then decreases from 0.7 wt% to 1.3 wt% with SPM glass addition. The grain boundary conductivity also changes accordingly. Especially, the highest ionic conductivity of 2.45 × 10 −4 S cm −1 , and a relative density of 96.72% with a low activation energy of 0.34 eV is obtained in LATP with 0.7 wt% SPM. Increasing the density of LATP solid electrolyte is crucial to improve the ionic conductivity of electrolytes and SPM glass addition can promote the development of dense oxide ceramic electrolytes.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-13
·
IF 15.7
Yuan Ziliang,Han Bo,Liu Bing,Sun Jie,Zhou Peng,Mu Rentao,Zhang Zehui
Reductive-coupling of nitro compounds and alcohols is a sustainable route for constructing C = N bonds in organonitrogen chemicals, yet challenging due to the inertness of α-C sp3 -H bond in alcohols and the vulnerability of C = N bonds towards hydrogenation. Here, we report the surprising catalytic activity of ultrafine alkaline-earth metal oxide MgO nanoclusters (0.9 ± 0.3 nm) that efficiently activate α-C sp3 -H bonds, facilitating the transfer hydrogenation and synthesis of value-added chemicals bearing C = N bonds with high to excellent yields (86–99%). Controlled experiments and characterizations showed the crucial role of oxygen vacancies (O v ) and local Mg environment (Mg-O bond) in MgO for substrate adsorption and activation via electronic interactions between substrate’s negatively charged oxygen atoms and O v sites in MgO nanoclusters. Theoretical calculation further confirmed that O v significantly lowered the energy barrier of the hydrogen atom transfer from α-C sp3 -H in ethanol to the nitro group in nitrobenzene (29.3 vs . 52.9 kcal/mol), which is the rate-determining step with the highest energy barrier in reductive-coupling reactions. Our method not only provides an efficient and sustainable pathway for synthesizing organonitrogen chemicals with C = N bonds but also inspires the exploration of main group element catalysts as alternatives to transition metal and noble metal catalysts for organic transformations.
研究领域:
催化化学
·
材料科学
·
有机合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Qi Yuan,Yutong Meng,Sen Wang,Gaobin Liu,Qiyao Wang,Kuoming Song,He Zhao,Shuai Yan,Xin Li
The effects of different contents of B 2 O 3 -Bi 2 O 3 on the sintering temperature and dielectric properties of MgO-12%TiO 2 (w) ceramics were investigated. B 2 O 3 -Bi 2 O 3 addition effectively reduced the sintering temperature and improved the dielectric properties of ceramic samples; however, an excessive amount of B 2 O 3 -Bi 2 O 3 led to the deterioration of dielectric properties. This is because Bi 2 O 3 participated in the chemical reaction between MgO and TiO 2 and generated a high-dielectric-loss Bi 2 Ti 2 O 7 phase, resulting in an increased dielectric loss in the ceramic samples. In contrast, B 2 O 3 formed a liquid phase to fill the grain gaps and pores during sintering, improving the densities of the ceramic samples. An appropriate amount of B 2 O 3 -Bi 2 O 3 accelerated the reaction between MgO and TiO 2 and formed ultralow-dielectric-loss phases—MgTiO 3 and Mg 2 TiO 4 , and the dielectric losses of the ceramic samples decreased to an order of 10 −5 .
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 2
·1033-1041
·
IF 3.9
Xiaoyu Li,Hongye Wang,Xinwei Xu,Naichao Chen,Biao Guo,Jin Cheng,Xianqiang Chen,Hong Wang
The MgO-MoO 3 system shows significant potential for applications in microwave dielectric ceramics. However, the formation mechanism, crystal structures, and microwave dielectric properties of this system have not been systematically investigated. This work aims to comprehensively study the crystal structures, phase transitions, and microwave dielectric properties of compounds in the MgO-MoO 3 system. In particular, the research delves into the unexplored transformation mechanism from β-MgMo 2 O 7 to α-MgMo 2 O 7 and MgMoO 4 . As a result, the three compounds exhibiting favorable microwave dielectric properties have been successfully fabricated. These compounds can be effectively sintered at temperatures ranging from 685 to 900°C and exhibited dielectric constants (ε r ) ranging from 5.41 to 6.89, as well as Qf values ranging from 100 000 to 130 000 GHz. Additionally, prototype microstrip antennas are designed and fabricated using β-MgMo 2 O 7 and MgMoO 4 ceramics as substrates. The obtained antenna's performance is excellent, with S 11 values below −30 dB and a gain exceeding 6 dB at 5.8 GHz, highlighting the potential of the developed ceramics for practical applications in microwave devices.
研究领域:
材料科学
·
陶瓷工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2019
·
IF 3.413
Yamei Yue,Ziling Peng,Wei Wang,Yuncheng Cai,Fatang Tan,Xinyun Wang,Xueliang Qiao
The MgO-loaded SiO 2 nanocomposites were successfully synthesized via a facile precipitation and calcination method, and used for the elimination of antibiotics from aqueous solution. Multiple techniques such as X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FT-IR), transmission electron microscope (TEM), X-ray diffraction (XRD) and Brunauer-Emmett-Teller (BET) were employed to characterize the structure and morphology of the obtained nanocomposites. The effects of the loading content of MgO , initial solution pH and temperature on the adsorption performance of MgO-loaded SiO 2 nanocomposites were assessed by removing tetracycline from aqueous solution. It was found that 50% MgO-loaded SiO 2 exhibited excellent adsorption performance towards tetracycline with a removal rate above 80% in a wide pH range of 4–10, which was much higher than that of individual MgO and mesoporous SiO 2 . The nanocomposite possessed higher specific surface area (356.02 m 2 g −1 ) and smaller MgO particles compared with pure MgO (81.02 m 2 g −1 ), which can provide more active sites, thus enhancing the adsorption performance towards tetracycline. The electrostatic interaction and inner-sphere complexation between nanocomposites and tetracycline molecules were considered to play important roles in the adsorption process of tetracycline. The as-synthesized nanocomposites as promising adsorbents have a potential application in the removal of antibiotics from aqueous solution.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2017
·
IF 4.873
Jingxin Zhang,Zhongjie Du,Wei Zou,Hangquan Li,Chen Zhang
A magnesium oxide (MgO) nanoparticles-decorated carbon fiber hybrid (CF MgO) were designed and fabricated as thermal conductive but electric insulating filler for polymer matrix . Carbon fibers (CF) and MgO nanoparticles were firstly treated by the coupling agents with amine groups and epoxy groups , respectively. Then CF MgO was constructed through grafting the nanoparticles onto the surface of the fiber. It was expected that the thermal conductivity of CF would be enhanced but its electrical conductivity would be inhibited by the coating of MgO nanoparticles. The chemical structure and morphology of CF MgO were investigated using Fourier transform infrared spectrometer (FT-IR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). Finally, the hybrid filler was introduced into Nylon 6. The strong interfacial interaction between the filler and matrix was exhibited, attributed to the existence of the coupling agents and the rough surface of nanoparticles-decorated CF. The highest thermal conductivity reached 0.748 W/m·K at 20 wt % addition of CF MgO. Meanwhile, the insulation of the composite appeared at higher than 10 wt% addition of the hybrid filler. Furthermore, connected by MgO nanoparticles, less CF was necessary for the construction of heat conduction channel, and lower value of percolation threshold was achieved.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhen Huang,Jiangfeng Lu,Shule Liu,Jing Ding,Weilong Wang
Alkali metal molten salts (AMS) have shown exceptional potential in enhancing the CO 2 adsorption capacity of MgO-based sorbents at moderate temperatures. However, significant challenges still persist in terms of their thermal stability and recyclability due to sintering issues. In this study, a MgO-SrO composite sorbent was prepared using modified methanol evaporation-induced surface precipitation and promoted by molten nitrate to facilitate CO 2 adsorption at moderate temperatures. Adsorption kinetics revealed that the chemisorption process dominated the CO 2 adsorption on the surface of the MgO-SrO sorbent, with intraparticle diffusion being the main limiting step. Further investigation into the thermal stability and recyclability showed that the MgO-SrO sorbent retained good adsorption performance after 15 cycles of adsorption–desorption. By exploring the adsorption mechanism through Density functional theory (DFT) calculations, the participation mechanism of SrO during CO 2 adsorption was elucidated by examining the charge transfer and bonding strength of surface O atoms on the MgO. This study provides new insights for enhancing the thermal stability and recyclability of MgO-based sorbents under moderate temperature conditions.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）