摘要：
High nickel ternary materials have high electrochemical activity. But because of the side reactions with the electrolyte and irreversibly dissolve the transition metal ions, nickel ternary materials are difficult to carry out the dissociation and intercalation reaction during the charge and discharge reaction of the battery. In present work, lanthanum oxide coated on the surface of high nickel ternary materials was successfully prepared by using the liquid phase atomic deposition method. And the compound material was characterized by SEM and TEM. The tests results showed that the lanthanum oxide coating did not change the crystal structure of the raw materials. The coating layer could effectively improve the electrochemical stability of the high nickel ternary material. The first discharge capacity of the 4 wt. % La2O3 coated material at 1 C rate is 177.2mAh center dot g-1, which was close to that of the uncoated material 179.2mAh center dot g-1. However, the capacity still maintained 150.9mAh center dot g-1 and retention rate of the coating material is 85.2 % when that of the uncoated material was only 121.0mAh center dot g-1 after 100 cycles. In addition, the AC impedance test also showed that the lanthanum oxide coating layer could effectively improve the surface stability of the high nickel ternary material.
期刊：
Journal of Alloys and Compounds,2023年969:172304 ISSN：0925-8388
通讯作者：
Zheng, X;Wang, GJ;Hou, YJ
作者机构：
[Hu, Tao; Gong, Xinghou; Wu, Chonggang; Guo, Lei; Zhu, Chuanhui; Zheng, Xuan] Hubei Univ Technol, Sch Mat & Chem Engn, Hubei Prov Key Lab Green Mat Light Ind, Wuhan 436800, Peoples R China.;[Wang, Guangjin; Wang, GJ] Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 52800, Peoples R China.;[Hu, Tao; Gong, Xinghou; Wu, Chonggang; Zheng, Xuan] Hubei Longzhong Lab, Xiangyang 441000, Peoples R China.;[Hou, YJ; Hou, Yuanjing] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
通讯机构：
[Wang, GJ ] F;[Hou, YJ ] W;[Zheng, X ] H;Hubei Univ Technol, Sch Mat & Chem Engn, Hubei Prov Key Lab Green Mat Light Ind, Wuhan 436800, Peoples R China.;Foshan Univ, Sch Mat Sci & Energy Engn, Foshan 52800, Peoples R China.
关键词：
Composite materials;Chemical synthesis;Liquid crystals;Transition metal alloys and compounds;Electrochemical reactions
摘要：
In this work, a room temperature liquid metal alloy (Galinstan) and tungsten diselenide (WSe2) composite anode (LMx@WSe2) were synthesized utilizing a one-step hydrothermal method. Through a comprehensive characterization process, including XRD, SEM, HRTEM, Raman spectroscopy, XPS, and BET, the structural and morphological properties of the synthesized composites were extensively explored. The liquid metal alloy was observed to combine effectively with WSe2 via electrostatic adsorption, coordination, and additional bonding methods. Furthermore, it displayed high fluidity, deformability, and chemical stability. Consequently, the alloy promoted the repair of cracked surface areas in the electrode material and reduced internal oxidation-reduction reactions, leading to improved electrochemical performance during repeated lithium-ion insertion and extraction cycles. After 500 cycles at a current density of 1 A g-1, this composite electrode retained a capacity of 224.5 mAh g-1. Impressively, at a low temperature of -10 degrees C, it maintained a capacity of 290 mAh g-1 after 50 cycles at a current density of 0.2 A g-1. Our research may open avenues for addressing mechanical difficulties experienced in flexible electronic devices and self-healing electronic circuits exposed to chemical reaction processes.
摘要：
Traumatic nerve defects result in dysfunctions of sensory and motor nerves and are usually accompanied by pain. Nerve guidance conduits (NGCs) are widely applied to bridge large-gap nerve defects. However, few NGCs can truly replace autologous nerve grafts to achieve comprehensive neural regeneration and function recovery. Herein, a three-dimensional (3D) sponge-filled nanofibrous NGC (sf@NGC) resembling the structure of native peripheral nerves was developed. The conduit was fabricated by electrospinning a poly(L-lactide-co-glycolide) (PLGA) membrane, whereas the intraluminal filler was obtained by freeze-drying a collagen-based matrix (ColM) resembling the extracellular matrix. The effects of the electrospinning process and of the composition of ColM on the physicochemical performance of sf@NGC were investigated in detail. Furthermore, the biocompatibility of the PLGA sheath and ColM were evaluated. The continuous and homogeneous PLGA nanofiber membrane had high porosity and tensile strength. ColM was shown to exhibit an ECM-like architecture characterized by a multistage pore structure and a high porosity level of over 70%. The PLGA sheath and ColM were shown to possess stagewise degradability and good biocompatibility. In conclusion, sf@NGC may have a favorable potential for the treatment of nerve reconstruction.
摘要：
To combat bacteria and even biofilm infections, developing alternative antibacterial wound dressings independent of antibiotics is imperative. Herein, this study developed a series of bioactive chitin/Mn3O4 composite hydrogels under mild conditions for infected wound healing application. The in situ synthesized Mn3O4 NPs homogeneously distribute throughout chitin networks and strongly interact with chitin matrix, and as well as endow the chitin/Mn3O4 hydrogels with NIR-assisted outstanding photothermal antibacterial and antibiofilm activities. Meantime, the chitin/Mn3O4 hydrogels exhibit favorable biocompatibility and antioxidant property. Furthermore, the chitin/Mn3O4 hydrogels with the assist of NIR show an excellent skin wound healing performance in a mouse full-thickness S. aureus biofilms-infected wound model, by accelerating the phase transition from inflammation to remodeling. This study broadens the scope for the fabrication of chitin hydrogels with antibacterial property, and offers an excellent alternative for the bacterial-associated wound infection therapy.
通讯机构：
[Peng Jiang; Yi Liu] C;College of Chemistry and Molecular Sciences & School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University, Wuhan 430072, PR China<&wdkj&>School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, PR China<&wdkj&>State Key Laboratory of Separation Membrane and Membrane Process & Tianjin Key Laboratory of Green Chemical Technology and Process Engineering, School of Chemistry, Tiangong University, Tianjin 300387, PR China<&wdkj&>College of Chemistry and Molecular Sciences & School of Pharmaceutical Sciences, Key Laboratory of Combinatorial Biosynthesis and Drug Discovery (MOE), Wuhan University, Wuhan 430072, PR China<&wdkj&>Hubei Jiangxia Laboratory, Wuhan 430023, PR China
摘要：
A novel procedure of dual direct immersion single-drop microextraction (DDI-SDME) was developed for the sequential separation and preconcentration of Fe(III) and Fe(II) followed by graphite furnace atomic absorption spectrometry determination. At pH 1.5, Fe(III) can selectively react with N-benzoyl-N-phenylhydroxylamine (BPHA) to form the hydrophobic complexes which can be extracted into one organic drop, while Fe(II) remained in the solution. Then, another organic drop containing BPHA was immersed in the sample solution after the extraction of Fe(III) for the preconcentration of Fe(II) at pH 4.5. This procedure eliminated the time-consuming and labor-intensive step of oxidation of Fe(II) or reduction of Fe(III), which may cause the incomplete conversion of the species and sample contamination. Main conditions influencing the separation and enrichment of Fe species were studied. Under the selected conditions, the detection limits of this procedure were 0.058 ng mL(-1) and 0.074 ng mL(-1) for Fe(III) and Fe(II) with relative standard deviations of 4.8% and 5.6%, respectively. Enrichment factors of 300-fold were obtained for Fe species. The proposed procedure was successfully utilized for detecting Fe(III) and Fe(II) in food samples. To evaluate accuracy of this procedure, a certified reference material of milk powder was analyzed, and the determined value was in good agreement with the certified value.
通讯机构：
[Haibo Wang] S;School of Chemistry and Environmental Engineering, Wuhan Polytechnic University, Changqing Garden, Wuhan, Hubei, China
摘要：
Fish scale collagen peptides were used as a precursor to prepare carbon dots using conventional hydrothermal (CDs-HT) and microwave (CDs-MW) methods. The optical properties of CDs prepared using the two methods were compared and the influence of the heating method on the structure of CDs was analyzed. Both CDs emitted blue fluorescence and exhibited an excitation-dependent emission character. The rapid and uniform heating during the microwave method is more conducive to the self-doping of nitrogen. Although CDs-HT have a lower doping amount of nitrogen, the relative content of pyrrolic N is higher. In contrast to the limited sealing of the microwave reaction vessel, the controllable high-temperature sealing environment of the conventional hydrothermal method could promote complete dehydration and condensation of the precursor to form smaller-sized CDs. Therefore, in comparison to CDs-MW, CDs-HT exhibited a higher quantum yield (9.29% versus 4.86%).
摘要：
Beryllium is an extremely toxic element for human beings. Therefore, knowledge of Be content in food samples is important to evaluating its potential effect on human health. The present study aimed to develop an efficient method for the quantification of Be in Chinese yellow rice wines. Samples were diluted with ultrapure water, and then directly analyzed by syringe membrane solid phase extraction (SMSPE) combined with graphite furnace atomic absorption spectrometry. TiO2@SiO2 flexible nanofiber membrane (TSFNFM) was used as the sorbent of SMSPE for enriching Be and eliminating matrices. Detection limit was 0.52 ng L-1 for Be with relative standard deviation of 6.4%. The linear range of calibration curve was in the range of 0.03-25 ng mL(-1) with a correlation coefficient of 0.9946. An enrichment factor of 150 was obtained for Be. Two certified reference materials of tea leaves and rice were analyzed by this method, and the obtained results were in good agreement with certified values. The recoveries of spiking experiments were in the range of 90.0-110%. This method avoided the labor-intensive and time-consuming vortex/ultrasound and centrifugation/filtration steps, which may result in sample contamination and analysis errors.
通讯机构：
[Liu, Y ; Gao, T] W;Wuhan Univ Sci & Technol, Inst Adv Mat & Nanotechnol, Sch Chem & Chem Engn, Hubei Prov Key Lab Coal Convers & New Carbon Mat, Wuhan 430081, Peoples R China.;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.
摘要：
The synthesis of low-cost and high-efficiency multicolour emitting graphene quantum dots (GQDs) is of utmost importance for their prospective applications. Lignin, a renewable biomass, contains aromatic compounds that are well-suited for the preparation of polycyclic aromatic GQDs. In this study, we successfully synthesized red, yellow, green, and blue light-emitting single-layered GQDs with high crystallization using hydrothermal methods, thereby covering the full spectrum of visible light. High-resolution transmission electron microscopy (HRTEM) images revealed the presence of a two-dimensional crystal lattice with the 100 (0.21 nm) and 002 (0.24 nm) facets of graphite, indicating the high crystallization of the synthesized GQDs. Additionally, the average height of all GQDs was found to be below 1 nm, confirming their single-layered structure. This observation supports the notion that mono-benzene compounds tend to form fused polycyclic arenes under high pressure and temperature conditions. Moreover, by analyzing X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared (FT-IR) spectra, we investigated the formation mechanism of GQDs derived from lignin at the molecular level. The cleavage of ether bonds, aldol condensation, benzylic acid rearrangement, and dehydration were identified as vital intermediate processes. Furthermore, we successfully demonstrated the application of multicolour-emitting GQDs derived from lignin in light-emitting diodes (LEDs). This synthetic strategy for producing multicolour-emitting GQDs from lignin opens up a new path for the conversion of sustainable biomass into high-value nanomaterials.
摘要：
Formulation and shaping of heterogeneous catalysts are vital in the successful industrial application. Here micro-sized vanadium chromium composite oxides catalysts with the spherical shape were prepared via spray drying with colloidal silica as a binder material. The physicochemical properties of catalysts with different Cr/V molar ratios were characterized by XRD, XPS, FT-IR, TPR, and particle size distribution analysis. It was revealed that the addition of Cr inhibited the formation of the crystalline phase V2O5 and decreased the reduction temperature of pentavalent vanadium species, and also resulted in the formation of monoclinic CrVO4 and a highly dispersed state of vanadia species. VCrO/SiO2 particles with various Cr/V atomic ratio were studied as catalysts for p-chlorotoluene ammoxidation to p-chlorobenzonitrile, in which the catalyst with Cr/V ratio of 1 exhibited the best catalytic performance. When the Cr/V ratio was less than 1, mixed phases of orthorhombic CrVO4 and monoclinic Cr2V4O13 were formed and resulted in a low catalytic activity. With the increase of Cr/V ratio, the content of monoclinic CrVO4 in the catalysts increased, resulting in the catalytic activity of the catalysts improved. However, too large an amount of Cr led to the formation of highly oxidizing hexagonal-Cr2O3 phase, which reduced the selectivity of the catalytic reaction. [GRAPHICS] .
摘要：
The amount of substation accident oil pool wastewater (SAOPW) generated has been increasing due to the successive addition and renovation of substations, and the discharge of untreated or incomplete treatment outside the station will cause serious environmental pollution problems. In this study, a polyethersulfone (PES) composite ultrafiltration membranes were fabricated using phase inversion method and evaluated them for oil removal from SAOPW. The morphology and functional groups of PES composite membranes before and after filtration were characterized and compared through scanning electron microscopy and Fourier-transform infrared spectroscopy. The effects of operating pressure, feed temperature, initial oil concentration and operating time were systematically investigated using flux recovery and oil removal rate as the indexes of investigation, and the process economy was studied and evaluated. The results showed that the PES composite membrane had a relatively high-water flux of 260.2 (L.m(-2).h(-1)) and a high oil removal rate (>= 90%), which could effectively remove oil from water. Besides, its high flux recovery ratio (>= 90%) after four filtration and cleaning cycles indicated the excellent performance of this PES composite membrane in the separation of oil-water emulsions. This study confirms the applicability of PES composite membrane for oil removal from SAOPW, providing a promising treatment method for the SAOPW treatment.
摘要：
From a practical standpoint, it is still challenging to develop adsorbents with high adsorption capacity and outstanding selectivity for rhenium in uranium ore leaching solution. In this study, in order to explore the structure-property relationship, four nucleobases (Adenine, Guanine, Hypoxanthine and Xanthine) were used as functionalization reagents to modify cellulose (MCC-g-GMA-A, MCC-g-GMA-G, MCC-g-GMA-H and MCC-g-GMA-X) via radiation method. The effect of the type of nucleobases on the adsorption performance was evaluated by batch and dynamic experiments. The order of maximum adsorption capacity was MCC-g-GMA-A (194.0mgg(-1))>MCC-g-GMA-G (123.4mgg(-1))>MCC-g-GMA-H (45.59mgg(-1))>MCC-g-GMA-X (23.43mgg(-1)), which was associated with the category of nitrogen-functional groups. Different nitrogen-containing functional groups have different degrees of protonation, which leads to differences in the interaction of the adsorbent with Re(VII). Notably, the adsorbents were able to selectively capture trace Re(VII) from the simulated uranium ore leaching solution. The FT-IR, XPS analyses, DFT theoretical calculations exhibited that the adsorption mechanism of nucleobases functionalized cellulose microspheres and Re(VII) was electrostatic interaction. MCC-g-GMA-A and MCC-g-GMA-G exhibited excellent selectivity towards Re(VII), which are potential adsorbents for Re(VII) recovery in uranium ore leaching solutions.
摘要：
Co-pyrolysis characteristics of rice husk and cow manure using SnCl2, ZnCl2 and Fe3O4 as an additive were studied in a fixed tubular furnace. The effects of additive loading amount (0–20 wt.%) on the pyrolysis processes were investigated. The thermogravimetric-derivative thermogravimetric results showed that the weight loss rate was increased with the increase of additive content. There was no obvious shoulder peak appeared after the addition of Fe3O4, while the peak of weight loss was moved to the low-temperature region with the ZnCl2 addition. Gas yield was increased with the increase of Fe3O4 content while it was decreased after the addition of SnCl2 and ZnCl2. The highest gas yield (0.39 Nm3/kg) was obtained at 20% Fe3O4. At the same time, the additives could obviously improve the quality of syngas which promoted H2 content and reduced CO content. The H2 content was increased by 7.9%, 8.88%, and 4.44%, respectively, for SnCl2, ZnCl2, and Fe3O4. The results of GC/MS showed that the additives promoted hydrogen bond breaking and the cracking of macromolecules resulting in an increase of small polycyclic aromatic hydrocarbons production. Meanwhile, the additives made a great influence on the oxygen-containing functional groups in the biochar, which increased the content of O–H and O–C–O functional groups.
期刊：
Journal of Electroanalytical Chemistry,2023年929:117093 ISSN：1572-6657
通讯作者：
Lihong Xue<&wdkj&>Wuxing Zhang
作者机构：
[Chen, Weilun; Xue, Lihong; Liao, Yaqi; Guo, Yixuan; Zhang, Wuxing; Peng, Jiayu] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China.;[Chen, Kongyao] Zhongyuan Univ Technol, Ctr Adv Mat Res, Henan Key Lab Funct Salt Mat, Zhengzhou 450007, Peoples R China.;[Wan, Min; Zeng, Rui] Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Peoples R China.;[Meng, Jintao] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect WNLO, Wuhan 430074, Peoples R China.
通讯机构：
[Lihong Xue; Wuxing Zhang] S;State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
摘要：
The instability of the solid-liquid interface is a crucial problem of the silicon (Si) anode, which seriously affects the performance of the battery. Therefore, constructing an artificial interface for silicon (Si) anodes is an effi-cient way to restrain the volume expansion and reduce the side reactions. Herein, we develop a poly(acryloni-trile)-Sulfur (PAN-S) based artificial solid-electrolyte interphase (SEI) film on Si, which significantly improves the cycling and rate performance owing to its mechanical strength and ion transport ability. The PAN-S coated silicon anode exhibits outstanding electrochemical performance, which shows a good cycle life of 1370 mAh g-1 capacity retained after 500 cycles at 0.5C (1C = 4000 mA g-1) and outstanding rate performance of 1103 mAh g-1 retained at 4C. This work provides a facile surface engineering strategy for designing electrode mate-rials with significant volume expansion and poor electrochemical kinetics.
关键词：
Two-dimensional nanochannel membrane;Montmorillonite;Separation of Li + and Mg 2+;Porous nanochannel
摘要：
Recent innovations have created various two-dimensional membranes to break the Li+/Mg2+ selectivity limit of traditional separation membranes. However, the simultaneous achievement of ultrafast transport and high selectivity is still below the theoretical prediction. Herein, for overcoming these shortcomings, the twodimensional montmorillonite membrane (2D MMT membrane) consisting of sulfonated polyvinyl alcohol (SPVA), ethylene glycol (EG), and polyacrylamide (PAM) is proposed based on the design of porous 2D nano channels. It is found that the SPVA can effectively improve the membrane stability, but will densify the channel, and prevent ion transport. When the appropriate EG is included in the membrane component, the transport rate of Li+ can be increased from 0.29 mol h-1 m- 2 to 0.56 mol h-1 m- 2. However, because the transport of Mg2+ needs to overcome the high dehydration energy barrier, the JMg2+ changes little, hence increases in SLi+Mg2+ from 4.1 to 7.3. In addition, the selectivity regulation of PAM can be further integrated, and the permselectivity of the membrane is improved to 9.2 due to the strong selective coordination of amide groups to Mg2+. This novel strategy provides a valuable reference for developing high-performance 2D MMT membranes, which can also promote the application of 2D membranes in the Li+/Mg2+ separation.
通讯机构：
[Fui, H ] W;Wuhan Polytech Univ, Sch Chem & Environm Engn, Wuhan 430023, Hubei, Peoples R China.
摘要：
Layered double hydroxides (LDHs) have been extensively investigated as promising peroxymonosulfate (PMS) activators for the degradation of organic pollutants. However, bulk LDHs synthesized using conventional methods possess a closely stacked layered structure, which seriously blocks active sites and yields low intrinsic activity. In this study, we exfoliated bulk CoAl-LDHs to fabricate CoAl-LDH nanosheets by alkali-etching and Ostwald ripening via a simple hydrothermal process in a KOH solution. The exfoliated LDHs possessed the typical nanosheet structure with more exposed active sites for PMS activation, and hence, boosted the degradation of the pollutants. CoAl-1 exhibited an outstanding catalytic performance as the PMS activator for rhodamine B (RhB) degradation with the apparent rate constant of 0.1687 min(-1), which was about 3.63 and 5.02 times higher than that of commercial nano-Co3O4 and bulk CoAl-LDH, respectively. The maximum RhB degradation of 93.1% was achieved at the optimal reaction conditions: catalyst dose 0.1 g L-1, PMS concentration 0.3 mM, pH 7, and temperature 298 K. Further analysis of RhB degradation mechanism illustrated that singlet oxygen (O-1(2)) dominated RhB degradation in the CoAl-1/PMS system, while (OH)-O-center dot, O-center dot(2)-, and (SO4-)-S-center dot may mainly serve as the intermediates for the generation of O-1(2) and were indirectly involved in the degradation. This study provides a promising strategy for developing two-dimensional LDH nanosheets for wastewater remediation.
