CHEMOSPHERE
·
2019
·
IF 5.108
Jian Lu,Qi Sun,Jun Wu,Guangcan Zhu
Techniques for reutilization of the discarded bischofite are limited while efficient recovery of the Mg(OH) 2 nanoparticles from water during the synthesis and reuse processes is a challenge. In this study, the Fe 3 O 4 @Mg(OH) 2 core-shell magnetic nanoparticles were firstly prepared from discarded bischofite and used as catalyst for improving the ozonation of metronidazole (MNZ). The removal rate constant of MNZ increased by 694.7% using Fe 3 O 4 @Mg(OH) 2 . Compared with the Mg(OH) 2 control, the MNZ removal rate constant of Fe 3 O 4 @Mg(OH) 2 treatment was almost tripled. The persistent high catalytic activity of the Fe 3 O 4 @Mg(OH) 2 catalyst was observed since the MNZ removal rate constant decreased by just 13.2% in the third reuse run. The Fe 3 O 4 @Mg(OH) 2 primarily enhanced ozone decomposition through producing hydroxyl radicals . The MNZ removal rate constant increased from 0.075 min −1 to 0.643 min −1 as catalyst dose increased from 0 to 0.6 g L −1 while it decreased by 96.0% when its initial concentration increased from 10 to 200 mg L −1 . The maximum removal rate constant was observed at 25 °C when temperature increased from 15 °C to 35 °C. The Cl − , HCO 3 − , SO 4 2− , Ca 2+ , Mg 2+ ions could jeopardize MNZ degradation. The antibacterial activity of MNZ was eliminated after catalytic ozonation while the mineralization efficiency was almost doubled. The nitro group reduction and the cleavage of hydroxyethyl bond were two main transformation pathways of MNZ. These findings suggest that Fe 3 O 4 @Mg(OH) 2 nanoparticle made from discarded bischofite is the promising catalyst for the ozonation of antibiotics in the terms of water purification practice and reutilization of the bischofite.
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高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 10
·2624-2635
·
IF 5.365
Jingxia Tian,Wei Chen,Peng Wu,Zhirong Zhu,Xiaohong Li
A Cux–Mgy–Zrz/SiO2 catalyst with a total metal loading of 60 wt% prepared by a deposition–precipitation method was applied for the selective hydrogenation of ethylene carbonate to methanol and ethylene glycol in a fixed-bed reactor. As a result, the Cu8–Mg1–Zr0.47/SiO2 catalyst furnished 99% ethylene carbonate conversion with 85% selectivity to methanol and 99% selectivity to ethylene glycol under the optimized reaction conditions. Moreover, the Cu8–Mg1–Zr0.47/SiO2 catalyst also showed a good lifetime and neither the activity nor the selectivity decreased the during 208 h test. The reaction was found to depend sensitively on the Cu particle size, the surface acidity and the catalyst surface composition. The synergistic effect of balanced Cu0 and Cu+ sites was considered to play a critical role in attaining high yields of methanol and ethylene glycol. Boric oxide also had a positive effect on the hydrogenation of ethylene carbonate, affording higher selectivity to methanol under much milder conditions.
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ACS Photonics
·
2018
·
IF 6.88
Fei Chen,Zhenyang Liu,Zhongyuan Guan,Zheming Liu,Xu Li,Zhenbo Deng,Feng Teng,Aiwei Tang
Colloidal ZnO nanoparticles (NPs) are widely used as an electron-transporting layer (ETL) in the solution-processed quantum-dot light-emitting diodes (QD-LEDs). However, the inherent drawbacks including surface defect sites and unbalanced charge injection prevent the device from realizing their further performance enhancement. In this work, a series of Mg doped ZnO (ZnO:Mg) and chloride-passivated ZnO (Cl@ZnO) NPs were synthesized by using a solution-precipitation strategy, and they exhibited tunable optical bandgaps and upward-shift of conduction-band maximum (CBM). Solution-processed QD-LEDs based on cadmium-free Cu-In-Zn-S/ZnS (CIZS/ZnS) nanocrystals (NCs) were fabricated by using ZnO:Mg and Cl@ZnO NPs as the ETLs, whose maximum peak external quantum efficiency (EQE) was nearly twice as high as that of QD-LEDs using ZnO NPs as the ETL (EQE = 1.54%). To take advantage of the benefits of ZnO:Mg and Cl@ZnO NPs, Cl@ZnO:Mg NPs were developed through the integration of Mg doping and Cl-passivation. Surprisingly, the cadmium-free QD-LEDs with the Cl@ZnO:Mg NPs as the ETL exhibited a maximum peak EQE of 3.72% and current efficiency of 11.08 cd A–1, which could be enhanced to be 4.05% and 12.17 cd A–1 by optimizing the Cl amount, respectively. The positive effects of the Mg doping and Cl-passivation on the cadmium-free QD-LEDs are primarily ascribed to the reduced electron injection barrier of ETL/the emitting layer interface and slower electron mobility, which can be verified by the ultraviolet photoelectron spectroscopy (UPS) measurements and current density–voltage characteristics of electron-only devices.
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Journal of Energy Storage
·
2024
·
IF 8.9
Congwen Duan,Haimei Wang,Jinhui Wu,Ting Qu,Yuling Zhang,Dong Fu,Lianxi Hu,Fei Wang,Dongsheng Lai,Yueru Dai,Ying Wu
Mg/MgH 2 stands out as an excellent hydrogen storage material due to its abundant presence and its capacity for high hydrogen storage density. However, the sluggish hydrogenation/dehydrogenation kinetics make it unsuitable for solid-state hydrogen storage. To tackle these challenges, the MgH 2 -Co@Pd‑c arbon nanotubes composite was created through ball milling , and its hydrogenation/dehydrogenation behavior was examined. The inclusion of Co@Pd notably enhanced the kinetics of hydrogenation/dehydrogenation in Mg/MgH 2 . The Mg-Co@Pd‑c arbon nanotubes composite achieved an absorption of 7.30 wt% H 2 in just 8 h of milling. The study proposed an energy conversion model to investigate the enhanced properties of Mg/MgH 2 . The addition of Co@Pd substantially reduced the activation energy (Ea) for hydrogen desorption to 81.9 kJ/mol. Furthermore, Transmission Electron Microscope and Density Functional Theory simulations were employed to understand how Co@Pd enhances the properties of Mg/MgH 2 . The improved hydriding/dehydriding kinetics of Mg/MgH 2 are likely closely linked to both the confining impact of c arbon nanotubes and the synergistic interplay of the “spillover” and “hydrogen pump” effects facilitated by the Co@Pd bimetallic catalysts . The excellent hydriding/dehydriding behavior is ascribed to the electron spillover and the phase transformation of Mg 2 Co/Mg 2 CoH 5 and Mg 6 Pd/Pd. These findings offer new insights into the new insights into the rational design of Co@Pd bimetallic catalysts, which are expected to be an optimal solution for supported catalysts in Mg-based solid-state hydrogen storage systems.
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2015
·Vol. 641
·期 11
·1953-1958
·
IF 1.16
Yunsheng Liu,Dajiang Mei,Jingli Xu,Yuandong Wu
Sodium magnesium selenite NaMg 2 (OH)(SeO 3 ) 2 and rubidium zinc selenite RbZn 2 (OH)(SeO 3 ) 2 were prepared by hydrothermal reactions. The crystal structures of the title compounds were determined by single-crystal X-ray diffraction. NaMg 2 (OH)(SeO 3 ) 2 crystallizes in the orthorhombic space group Pnma (no. 62) with lattice parameters a = 13.1919(10), b = 6.0415(4), c = 8.2182(6) Å, and Z = 4 and RbZn 2 (OH)(SeO 3 ) 2 crystallizes in the triclinic space group P (no. 2) with lattice parameters a = 4.8698(5), b = 7.3446(8), c = 11.7796(12) Å, α = 82.554(3), β = 78.456(2), γ = 71.603(3)°,and Z = 2. The structure of NaMg 2 (OH)(SeO 3 ) 2 is a three-dimensional framework consisting of edge-sharing MgO 6 octahedra and trigonal pyramidal SeO 3 2– groups, whereas the structure of RbZn 2 (OH)(SeO 3 ) 2 is a two-dimensional layers structure consisting of corner-sharing [Zn 2 O 7 ] dimers linked by trigonal pyramidal SeO 3 2– groups. The compounds were characterized by the solid state UV/Vis/NIR diffuse reflectance, and FT-IR spectroscopy.
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Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 14
·2498-2511
·
IF 4.872
Zhaojun Jia,Pan Xiong,Yuying Shi,Wenhao Zhou,Yan Cheng,Yufeng Zheng,Tingfei Xi,Shicheng Wei
The design of functional biomaterials that respond intelligently to external stimuli has become a rapidly growing area with widespread interest. This work contributes to the development of a feedback-active anticorrosion system with intriguing self-healing ability to protect magnesium (Mg) from biocorrosion. The system was constituted by an inner micro/nano-porous, ceramic-like pre-coating developed readily from the substrate, and an outermost inhibitor (nanosized cerium (Ce) oxides) containing chitosan (CS) multilayers. Here, the pre-coating acted as both an “anchoring” and a “barrier” layer to acquire structural integrity and improved impedance, respectively. Green CS served as cargo for Ce to be entrapped, harnessing Ce–NH2 complexation chemistry. The coating barrier properties were evaluated by electrochemical impedance spectroscopy. The active corrosion inhibition was assessed by immersion degradation tests with respect to Mg2+ release, pH alteration, crack development, and scanning Kelvin potential. To our delight, the coatings effectively protected the substrate from biocorrosion in vitro compared with bare alloys. Putatively, the pH-triggered formation of Ce oxide precipitation, along with the pH-buffering activity and movable swelling capacity of CS macromolecules, should have contributed to restraining the anodic activity and healing the cracks/defects dynamically. Furthermore, the coated substrate had the biocompatibility to elicit better attachment and growth of osteoblasts.
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高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Zhi Chen,Zanyong Zhuang,Qing Cao,Xiaohong Pan,Xiong Guan,Zhang Lin
The mechanism of the interaction between nano-Mg(OH)2 adsorbent and uranyl in water was studied. At trace levels, the uranyl is adsorbed as a monolayer on nano-Mg(OH)2, and occupied a small proportion of the adsorption sites. As the uranyl concentration crosses over a threshold, continuous increase of adsorption capacity takes place. It indicates that, by taking the pre-adsorbed uranyl as the nucleation centers, the additional uranyl crystallizes and forms U-rich nanocrystals well-scattered on the surface of nano-Mg(OH)2. A strategy of inducing fast crystal growth of nano-Mg(OH)2 to micrometer-sized Na2Mg(CO3)2 enables the desorption and enrichment of uranyl. The recycling and reuse of nano-Mg(OH)2 can be achieved simultaneously. The finding in this work provides fundamental understanding of the efficient usage of nano-Mg(OH)2 in practical applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2017
·Vol. 28
·期 9
·1-12
·
IF 2.325
Shuai Cijun,Yang Youwen,Peng Shuping,Gao Chengde,Feng Pei,Chen Jian,Liu Yong,Lin Xin,Yang Sheng,Yuan Fulai
Mg-5.6Zn-0.5Zr alloy (ZK60) tends to degrade too rapid for orthopedic application, in spite of its natural degradation, suitable strength and good biocompatibility. In this study, Nd was alloyed with ZK60 via laser melting method to enhance its corrosion resistance. The microstructure features, mechanical properties and corrosion behaviors of ZK60- x Nd ( x = 0, 1.8, 3.6, 5.4 wt.%) were investigated. Results showed that laser melted ZK60- x Nd were composed of fine ɑ-Mg grains and intermetallic phases along grain boundaries. And the precipitated intermetallic phases experienced successive changes: divorced island-like MgZn phase → honeycomb-like T phase → coarsened and agglomerated W phase with Nd increasing. It was worth noting that ZK60-3.6Nd with honeycomb-like T phase exhibited an optimal corrosion behavior with a corrosion rate of 1.56 mm year −1 . The improved corrosion behavior was ascribed to: (I) dense surface film caused by the formation of Nd 2 O 3 hindered the invasion of immersion solution; (II) the three-dimensional honeycomb structure of intermetallic phases formed a tight barrier to restrain the propagation of corrosion. Moreover, ZK60-3.6Nd exhibited good biocompatibility. It was suggested that ZK60-3.6Nd was a preferable candidate for biodegradable bone implant.
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高影响因子
KEY ENGINEERING MATERIALS
·
2017
·
IF 0
Meng Xia Qian,Jian Li Ma,Min Hong Xu
A novel supported catalyst is prepared through immobilization of water soluble phthalocyanine, which is synthesized by modifying tetraminophthalocyanine with cyanuric chloride, onto the supporting material Mg-Al hydrotalcite via co-precipitation method. The structure of the catalyst is characterized by infrared spectroscopy instrument (FT-IR) and X-ray diffractometer. Catalytic activity is examined through comparative experiments. The results show that it exhibits high catalytic activity for degradation of methylene blue (MB) in the presence of H2O2, the remaining rate of MB is 12.02% after 6 h. The reaction process conforms to the equation of pseudo-first-order kinetics, and the correlation coefficient R2> 0.99. The recycling tests for five times are also carried out and prove its reusability in catalytic application.
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Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Yueyue He,Huaigang Cheng,Zihe Pan,Xiangping Zhang
Heterogeneous catalysts can avoid the problem of difficult separation and recovery of homogeneous catalysts in transesterification reactions, but there is a lack of basis for process optimization because the quantitative influence mechanism of supports is not clear. In this work, we firstly attempt to make a comprehensive comparation on the effect of potassium fluoride (KF) catalysts on various supports (carbonates and oxides of cerium, magnesium and calcium) on the transesterification reaction, especially on the kinetics. According to the results, oxide-supported catalysts are significantly more active than carbonate-supported catalysts because they have more active sites. When oxides were used as supports, KF/MgO exhibited good activity because of its stronger basicity and higher number of active sites on the surface. Under the same process conditions, the stability time of KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction was 240 min, 90 min and 30 min, respectively. KF/MgO achieved a conversion of 68.0 %. The activation energies of the KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction were 22.22 kJ/mol, 15.93 kJ/mol and 15.80 kJ/mol, respectively. The surface alkalinity of KF/MgO increased the frequency of molecular collisions of the reactants and exhibited a faster reaction rate.
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CHEMOSPHERE
·
2024
·
IF 8.1
Chengqiang He,Yue Sun,Yingpeng Gu,Hongyu Ji
Generally, the pH of fluorinated groundwater or many industrial wastewater is neutral, while the majority of metal-modified adsorbents can work efficiently only under acidic conditions. In this study, we synthesized a novel hybrid adsorbent, Mg–Zr-D213, by loading nano-Mg/Zr binary metal (hydrogen) oxides in a strong-base anion exchanger, D213, to enhance the adsorption of fluoride from neutral water. Mg–Zr-D213 exhibited a better fluoride-removal capacity in neutral water than monometallic modified resins. Under the interference of competing anions and coexisting organic acids, Mg–Zr-D213 exhibited superior selectivity. The Langmuir model indicated that the fitted maximum sorption capacity of Mg–Zr-D213 was 41.38 mg/g. The results of column experiments showed that the effective treatment volume of Mg–Zr-D213 was 8–16-times higher than that of D213 for both synthetic groundwater and actual industrial wastewater, and that NaOH–NaCl eluent could effectively recover more than 95% of fluoride. Adsorption experiments with Mg/Zr metal (hydrogen) oxide particles and D213 separately demonstrated a synergistic effect between –N + (CH 3 ) 3 and Mg/Zr metal (hydrogen) oxide particles. The ligand exchange or metal-ligand interaction of Mg/Zr metal (hydrogen) oxide particles on fluoride was further demonstrated via X-ray photoelectron spectroscopy. Overall, Mg–Zr-D213 has great potential for enhanced fluoride removal in neutral water.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Zhijiang Rong,Wei Guo,Haotian Liang,Huan Lv,Hua Guo,Yi Zhang,Bo Zhang,Chunyan Hao,Xianjun Liu,Hongyan Sun,Yifan Gao
Biological metal ions play crucial roles in various life processes and exhibit diverse biological functions. Specifically, Ca(II), Mg(II), Cu(II), and Mn (II) ions are intricately involved in insulin function. To further clarify the biological functions of biological metal ions on insulin, the interaction mechanism of insulin affected by Ca(II), Mg(II), Cu(II), and Mn (II) ions were comparably investigated via spectroscopic, circular dichroism(CD), and electrochemical approaches. Electrochemical studies demonstrate that Mn(II) forms an M 2 L-type complex with insulin, exhibiting a binding constant of β Mn = 9.3 × 10 9 , while Cu(II) and insulin form an M 4 L-type complex with a significantly higher binding constant of β Cu =9.18 × 10 12 . Electrochemical investigation of the interaction between Ca(II) and Mg(II) with insulin adsorbed onto a glass carbon electrode surface revealed that the presence of Ca(II) and Mg(II) induced conformational changes in insulin, resulting in reduced adsorption capacity. Additionally, it was observed that the presence of Ca(II) and Mg(II) enhanced the redox signal of probe ions. The binding constants values were calculated to be 1.108 × 10 3 L•mol –1 for the insulin-Ca(II) system and 2.28 ×10 2 L• mol –1 for the insulin-Mg(II) system. Spectroscopic studies showed that the binding of Cu(II) ions to insulin molecules may be controlled by chelation mechanism, and the interaction between Cu(II) ions and insulin molecules may occur in the aromatic region. Mn(II) ion binding is mainly controlled by ionic interactions, and its binding site is far away from the aromatic region.The combination of Ca(II) and Mg(II) with insulin induced a small enhancement in the Ultraviolet-visible (UV) absorption peak, with Ca(II) exhibiting a more pronounced effect compared to Mg(II). The results of spectral, CD and electrochemical studies are consistent.
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