JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Pu Zhao,Zhengwei Li,Zhiwu Xu,Xuesong Leng,Anqi Tong,Jiuchun Yan
The oxide layer on the surface has always been a key obstacle to achieving the diffusion bonding of Al alloys. It is a challenge for performing diffusion bonding without removing oxide layers. Herein, diffusion bonding of Al alloy retaining continuous oxide layers was successfully achieved in the air by a low-temperature and low-pressure diffusion bonding mothed using a Zn interlayer. During the bonding processes, conducted at 360 °C and 3 MPa, Zn diffused into Al through cracks of thin oxide layers to form the joint composed Al/(diffusion layer)/(oxide layer)/(Zn)/(oxide layer)/(diffusion layer)/Al. The diffusion layers were composed of Zn-Al eutectoid, and the oxide layer included nanocrystals and amorphous Al 2 O 3 . The shear strength of joints containing continuous oxide layers was about 30 MPa. Interestingly, the migration behavior toward the joint center of the interfacial oxide layers was observed with consuming of the Zn interlayer. The cracking phenomenon, the “subcutaneous diffusion” and the migration behavior of oxide layers were verified and analyzed by the diffusion bonding of anodized 6063Al-6063Al. Subsequently, the dynamic migration mechanism of oxide layers with elements diffusion and bonding interface strengths were discussed in detail. The ability to join Al alloys in the air at low temperatures and low pressure suggests a highly practical and economic method for diffusion bonding.
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Nano Research
·
2023
·Vol. 16
·期 7
·9997-10003
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IF 9.9
Yu Zhumin,Zhao Kai,Li Lin,Ye Changqing,Dong Yuxiang,Song Yanlin
Localized surface plasmon resonance (LSPR) has been widely used in medical detection because of its time effectiveness, non-invasiveness, high sensitivity, and relatively simple fabrication process. Porous anodic alumina (PAA) can be regarded as a plasma substrate for label-free detection due to its unique two-dimensional structure. In this work, a vivid Au-PAA composite film with the inverted taper structure was developed by multi-step anodic oxidation and pore-widening processes followed by magnetron sputtering with Au nanoparticles (AuNPs). The highly saturated and bright structural color was generated by the synergistic effect of photonic and plasmonic modes. Interestingly, various Au-PAA composite films with structural colors altering from purple to red were obtained via adjusting the height/diameter ratio of PAA. Benefiting from the inverted taper structure, light trap characteristics were effectively enhanced by increasing the incident light and reducing the diffuse light. In addition, a finite difference time domain (FDTD) model was proposed to predict the relationship between the reflectance peak and the height of the composite film, and the simulated data were in good agreement with the experimental results. As a proof of concept, label-free detections of various reagents (water, ethanol, glycol, glycerol, and glucose), the concentration of glucose (refractive index sensitivity of 376 nm/RIU, RIU: refractive index unit), and thrombin (detection limit of 0.1 × 10 −7 mol/L) were realized by the Au-PAA composite film. This vivid Au-PAA composite film provides a very powerful tool for in-situ label-free bio-detection.
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ChemCatChem
·
2023
·Vol. 15
·期 7
·e202201687
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IF 4.5
Wenjing Xu,Yingying Cheng,Jing Hou,Peng Kang
Graphical Mesoporous TiO 2 spheres with large specific surface area were synthesized by a simple two-step method for the electrocatalytic reduction of oxalic acid. The maximum Faradaic efficiency for glycolic acid reached 73.9 % at −0.5 V at ambient temperature, exceeding most recently reported results. Reducing oxalic acid to glycolic acid electrochemically remains a significant challenge due to the high overpotential and low selectivity and stability. This study uses mesoporous TiO 2 spheres of anatase phase as catalysts to reduce oxalic acid to glycolic acid with low overpotential. The maximum Faradaic efficiency of glycolic acid reaches 73.9 % at −0.5 V vs RHE. The mesoporous structure not only increases the specific surface area, but also limits the escape of intermediate glyoxalic acid from the catalyst surface due to the space-limiting effect of the mesoporous channel, such that oxalic acid can be deeply reduced to glycolic acid. Moreover, a mechanism for oxalic acid reduction is proposed, and the Ti 3+ /Ti 4+ redox pair plays an important role in the reduction of oxalic acid.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Lijun Guo,Liangqiong Peng,Jiheng Li,Wenhua Zhang,Bi Shi
Thorium (Th) and uranium (U) separation remains a huge challenge due to their high similarity in chemical behavior. In this study, lignin-derived magnetic biochar (AL-Fe/BC), which can provide functional sites for adsorbing Th(IV) and U(VI), was synthesized for the selective extraction of Th(IV) from the binary U(VI)-Th(IV) matrix. Characterizations results confirm the successful zero-valent iron loading, and the AL-Fe/BC exhibited a developed polyporous structure, high surface area, stable crystallinity, high defects degree, and advantageous magnetic feature of expedient recovery from water without energy consumption. The optimist AL-Fe/BC-800 showed an outstanding adsorption capacity with a maximal Th(IV) uptake of 2000 mg/g, and a small absorption of 3 mg/g of U(VI) (Th(IV) = 180 mg/L, U(VI) = 20 mg/L, AL-Fe/BC-800 = 0.05 g/L). Moreover, the separation factor of Th(IV) from the Th(IV)-U(VI) matrix reached 90,000 even concomitant with high a concentration of co-existing ions. The active adsorption sites on AL-Fe/BC-800, such as COOH, C-OH, C=O, pyridinic N, graphitic N, and pyrrolic N, exhibited a stronger binding affinity with Th(IV) than U(VI), achieving selective Th(IV) adsorption via a chemisorption process on the basis of competitive adsorption. In summary, AL-Fe/BC-800 is a potential adsorbent in industrial application for the superefficient separation of Th(IV) and U(VI) with high-performance magnetic recovery, promoting the sustainable development of nuclear industry, especially considering the necessary development of Th(IV) fuel.
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Materials Today Chemistry
·
2023
·
IF 7.3
J.P. Mwizerwa,K. Xu,C. Liu,N. Zhao,Y. Li,P. Ndagijimana,Z. Chen,J. Shen
Currently, the development of high-performance lithium-ion batteries (LIBs) with improved areal capacity is still challenging. The common strategy to improve areal capacity is to increase the thickness of electrode materials. However, the application of thick electrodes remains challenge due to poor mechanical properties , slow charge and ion transport, and poor electrolyte infiltration . In this study, thick electrodes are constructed by 3D printing a Li 4 Ti 5 O 12 @VSe 2 -based ink. The highly electrical conductor VSe 2 on the Li 4 Ti 5 O 12 surface improves the ion and charge transport and eases the internal resistance of the 3D-printed electrode during charge and discharge. As a result, LIBs employing these thick electrodes show a high-rate capability of 128.9 mAh/g at 10 C, improved areal capacities up to 6.2 mAh/cm 2 , and ultrastable cycling capability (84.5% of capacity retention after 1700 cycles). Moreover, full cells utilizing 3D-Li 4 Ti 5 O 12 @VSe 2 as the anode and 3D-LiFePO 4 @AC/rGO as the cathode with 1.81 V potential yield a high specific capacity of 152.5 mAh/g at 0.1C, a high specific energy density of 276.025 Wh/kg, and a power density of 30.5 W/kg at 0.1C. This work paves the way to designing thick electrodes for high-performance LIBs.
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
He Wei,He Yu-Cai,Ye Jianren
The objective of this work was to develop an efficient approach for chemoenzymatically transforming biomass to furfurylamine by bridging chemocatalysis and biocatalysis in a deep eutectic solvent of EaCl:Gly–water. Using hydroxyapatite (HAP) as support, heterogeneous catalyst SO42−/SnO2–HAP was synthesized for transforming lignocellulosic biomass into furfural using organic acid as a co-catalyst. The turnover frequency (TOF) was correlated with the pKa value of the used organic acid. Corncob was transformed by oxalic acid (pKa = 1.25) (0.4 wt%) plus SO42−/SnO2–HAP (2.0 wt%) to produce furfural with a yield of 48.2% and a TOF of 6.33 h-1 in water. In deep eutectic solvent EaCl:Gly–water (1:2, v/v), co-catalysis with SO42−/SnO2–HAP and oxalic acid was utilized to transform corncob, rice straw, reed leaf, and sugarcane bagasse for the production of furfural with the yield of 42.4%–59.3% (based on the xylan content) at 180°C after 10 min. The formed furfural could be efficiently aminated to furfurylamine with E. coli CCZU-XLS160 cells in the presence of NH4Cl (as an amine donor). As a result of the biological amination of furfural derived from corncob, rice straw, reed leaf, and sugarcane bagasse for 24 h, the yields of furfurylamine reached >99%, with a productivity of 0.31–0.43 g furfurylamine per g xylan. In EaCl:Gly–water, an efficient chemoenzymatic catalysis strategy was employed to valorize lignocellulosic biomass into valuable furan chemicals.
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CHEMOSPHERE
·
2023
·
IF 8.8
Yijie Liu,Jingli Wu,Jinghua Chen,Shuliang Liu,Hao Xu,Qipeng Yang,Fengqi Xu,Yu Guo,Bo Jiang
In this study, an energy-efficient divided bipolar electrolysis system was developed for water softening, where two PTFE membranes were used as the separating materials and a bipolar electrode was employed to enhance the H 2 O-splitting reactions. As compared with other two operation modes, the optimum calcium harness removal efficiencies of 85% and 57% could be reached in the induction cathode effluent and terminal effluent, respectively, at 8 mA cm −2 in the mode A. Increasing the current density from 5 to 20 mA cm −2 evidently promoted the removal of calcium hardness from 33% to 65% in the terminal effluent and the CaCO 3 precipitation rate from 743 to 1462 gCaCO 3 h −1 m −2 with the increased energy consumption from 0.53 to 2.2 kWh kg −1 CaCO 3 . The optimized Ca 2+ /HCO 3 − molar ratio was 1:1.2 for the calcium hardness removal. In addition, increasing the flow rate into each cathode chamber from 10 to 40 mL min −1 gradually decreased from 67% to 35%. The calcium hardness was mainly removed in the forms of vaterite and calcite in the alkaline effluents and was marginally precipitated as aragonite and calcite on the cathodes surface. Generally, present energy-efficient electrochemical water softening system showed great potential for application in industrial processes.
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ENVIRONMENTAL TOXICOLOGY
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2023
·
IF 4.5
Yuan Tian,Wenwen Han,Long Fu,Kaiji Lv,Xinhua Zhou
Background Pancreatic cancer is one of the most aggressive tumors with a high-mortality rate. First-line drugs include 5-fluorouracil (5-FU), gemcitabine (GEM), and oxaliplatin (OXA). Resistance to 5-FU, GEM, and OXA is a major challenge. Immunoglobulin heavy chain F1 (IGHG1) participates in the regulation of cancer progression. It is still unclear how IGHG1 affects 5-FU, GEM, and OXA in pancreatic cancer. Methods The expression status of IGHG1 in pancreatic cancer was analyzed through bioinformatics tools. IGHG1 expression in pancreatic cancer tissues and cells was determined via RT–qPCR. Cell counting kit 8 assays, and flow cytometry analysis were utilized to detect the impact of IGHG1,5-FU, GEM, and OXA on cell proliferation and apoptosis. Western blotting was utilized to detect changes in the levels of the autophagy-associated proteins LC3, Beclin-1, p62, and ATG5. Immunofluorescence assays were employed to determine LC3 expression in cells. Xenograft experiments were conducted on nude mice to study tumor growth. Results IGHG1 was overexpressed in pancreatic cancer cells and tissues. IGHG1 expression was downregulated by 5-FU, GEM, or OXA treatment in cells. Treatment with 5-FU, GEM, or OXA repressed viability and promoted apoptosis and autophagy in pancreatic cancer cells. IGHG1 silencing exhibited the same results. Furthermore, IGHG1 depletion notably strengthened the effects of 5-FU, GEM, and OXA on pancreatic cancer cell viability, apoptosis, and autophagy. The combination of IGHG1 depletion with 5-FU, GEM, or OXA significantly reduced tumor growth in vivo. Conclusion Silencing of IGHG1 could enhance 5-FU, GEM, or OXA function in pancreatic cancer and reverse resistance by regulating apoptosis and autophagy.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Kunyu Hao,Zhuwei Sheng,Pengcheng Qi,Yu Lu,Gaofu Liu,Mingyue Chen,Hao Wu,Yiwen Tang
Aqueous rechargeable zinc-ion batteries (ARZIBs) are promising candidates for fast-charging energy-storage systems. The issues of stronger interactions between Zn 2+ and the cathode for ultrafast ARZIBs can be partially addressed by enhancing mass transfer and ion diffusion of the cathode. Herein, via thermal oxidation for the first time, N -doped VO 2 porous nanoflowers with short ion diffusion paths and improved electrical conductivity were synthesized as ARZIBs cathode materials . The introduction of nitrogen derived from the vanadium-based-zeolite imidazolyl framework (V-ZIF) contributes to enhanced electrical conductivity and faster ion diffusion, while the thermal oxidation of the VS 2 precursor assists the final product in exhibiting a more stable three-dimensional nanoflower structure. In particular, the N -doped VO 2 cathode shows excellent cycle stability and superior rate capability with the delivered capacities of 165.02 mAh g −1 and 85 mAh g −1 , at 10 A g −1 and 30 A g −1 , and the capacity retention of 91.4% after 2200 cycles and 99% after 9000 cycles, respectively. Remarkably, the battery takes less than 10 s to be fully charged at 30 A g −1 . Hence, this work provides a new avenue for designing unique nanostructured vanadium oxides and developing electrode materials suitable for ultrafast charging.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haonan Zhang,Shaoqing Chen,Nianji Zhang,Huihuang Chen,Yutong Yang,Yang Tu,Chuanlai Jiao,Zian Xu,Yu Xia,Hongri Suo,Zesheng Li,Chongxuan Liu,Hsing-Lin Wang
Electrochemical advanced oxidation processes (EAOPs) are promising technologies for the elimination of organic pollutants in water, but the high cost of the catalysts and treatment process restrict their large-scale application. Herein, highly efficient carbon-based catalysts for EAOPs were obtained by directly pyrolyzing low-cost sewage sludge, over which the elimination rates were up to 98% for methyl orange (MO) and 88% for tetracycline (TC). A precise electrochemical testing system demonstrated that the S-9/Ti electrode with 1.2 g catalyst loading owns the specific energy consumption value for 98% MO (5 mg/L) degradation was only 0.0112 kWh/g, and the value for 88% TC (1*10 -4 M) degradation was only 0.0039 kWh/g, in 8 h. Furthermore, active species capture experiments demonstrated that the •OH and •O 2 – radicals produced over the catalysts were the main oxidants for the elimination of pollutants. This study broadens the horizon for the resource utilization of sewage sludge and provides a strategy to realize the concept of “treating pollution with waste”.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qiang Sun,Hongxia Gao,Teerawat Sema,Zhiwu Liang
High energy consumption during the carbon dioxide (CO 2 ) desorption process in amine-based CO 2 capture technology is a crucial hindrance to achieving carbon neutrality. HZSM-5 is one of the most widely reported solid acid catalysts used in primary amine regeneration. This work compared a series of HZSM-5 zeolites with different Si/Al ratios in terms of CO 2 desorption performance. To further enhance catalytic activity, hierarchical HZSM-5 was synthesized by the dealumination and desilication re-assembly method with different acid and alkali concentrations. The experimental results suggested that desilication by modification in sodium hydroxide resulted in a significant improvement of mesoporous surface area. The NaOH-0.4 catalyst could improve the amount of desorbed CO 2 by 40.3% and decrease the relative heat duty by 28.5%. And the cyclic tests revealed that catalytic activity was well preserved in the recycling process. Moreover, the structure and acidity of modification samples were characterized by X-Ray diffraction (XRD), Fourier transforms infrared (FT-IR), Nitrogen adsorption–desorption experiment, temperature programmed desorption of ammonia (NH 3 -TPD), Pyridine-adsorption infrared spectroscopy (Py-IR), and scanning electron microscopy (SEM). The characterization results suggested that the synergistic effect of larger mesoporous surface area and total acid sites was important to enhance catalytic CO 2 desorption performance. These results showed a new understanding of catalyst design for CO 2 capture technology by modifying the structure of the catalyst support.
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WASTE MANAGEMENT
·
2023
·
IF 8.1
Man Zhang,Rubo Tian,Siyang Tang,Kejing Wu,Binshen Wang,Yingying Liu,Yingming Zhu,Houfang Lu,Bin Liang
Bamboo pulp and papermaking produce a lot of bamboo powder waste, and its resource utilization is of great significance for biomass refining and environmental protection. Here, we propose an integrated approach involving mechanical activation, hydrothermal extraction, and deep eutectic solvents (DESs) multiple delignification for the efficient separation of bamboo powder. Among seven carboxylic acids based DESs, choline chloride (ChCl)-lactic acid (La) DES (1:1) is the most effective, with over 78.0% lignin removal and 88.9% cellulose retained after mechanical-hydrothermal (180 °C, 5 h)-DES (110 °C, 12 h) treatment. Notably, 84.7% of delignification is achieved after three times of ChCl-La DES treatment at 70, 90, and 110 °C respectively. The delignification rate is negatively correlated with the amount of carboxyl group in the DESs. The lower the p K a value, the higher the delignification rate. Additionally, the selectivity for lignin is improved with decreasing solvent polarity. DES treatment effectively degrades the guaiacyl unit lignin fractions and disrupts several β-aryl-ether bonds (e.g., β-O-4, β-β, and β-5). Furthermore, DESs exhibit good recyclability, with less than 10% reduction in delignification after three cycles. Theory calculations confirm that ChCl-carboxylic acid DESs could compete with lignin to break hydrogen bonds in lignocellulosic biomass by providing their chloride, hydroxyl, and carboxyl groups. Overall, this study demonstrates the practical significance of multistage treatment for the effective fractionation of biomass into its three components.
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危险品化学品经营许可证（带存储）