SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yufeng Da,Yong Liu,Yong Chen,Rui Han,Jianlong Wang
Recently, the activation of molecular oxygen (O 2 ) by graphite (Gr) supported aluminum (Al) composite for the in-situ generation of H 2 O 2 / OH gains increasing attention. However, the limited O 2 mass transfer and low catalytic activity of decomposition H 2 O 2 at neutral pH restrict its further application in the wastewater treatment. In this work, a novel N-rich graphite supported aluminum (Al-Gr-NPC) composite was fabricated by introducing the nitrogen-rich porous carbon (NPC) obtained from ZIF-8 derivative as precursor, and by a ball-milling and sintering process. The results showed that the NPC introduction not only improved the physiochemical property of Al-Gr, such as specific surface area, pore structure and hydrophobicity, facilitating the mass transfer of O 2 , but also made Al-Gr contain plentiful N species, serving as active sites for the two-electron ORR process and catalytic decomposition of H 2 O 2 . These excellent performances of Al-Gr-NPC favored the production and utilization of H 2 O 2 by the activation of O 2 at neutral pH and air aeration. The carbonization temperature of ZIF-8 determined the type of N species, surface area and the hydrophobicity of NPC. 1 O 2 was the main oxidant for tetracycline hydrochloride (TC) degradation. 100 % TC degradation and 60.57 % of TOC removal were achieved within 60 min at neutral pH, Al-Gr-NPC dosage of 0.5 g/L and initial TC concentration of 20 mg/L. The toxicity of the final products of TC degradation were much lower than TC by ECOSAR software analysis. Al-Gr-NPC could be used for the removal of antibiotic contaminants from wastewater.
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Nature Communications
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2022
·Vol. 13
·期 1
·1-16
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IF 17.694
Meng Yun,Chen Lijie,Chen Yang,Shi Jieyun,Zhang Zheng,Wang Yiwen,Wu Fan,Jiang Xingwu,Yang Wei,Zhang Li,Wang Chaochao,Meng Xianfu,Wu Yelin,Bu Wenbo
Bacteria and excessive inflammation are two main factors causing non-healing wounds. However, current studies have mainly focused on the inhibition of bacteria survival for wound healing while ignoring the excessive inflammation induced by dead bacteria-released lipopolysaccharide (LPS) or peptidoglycan (PGN). Herein, a boron-trapping strategy has been proposed to prevent both infection and excessive inflammation by synthesizing a class of reactive metal boride nanoparticles (MB NPs). Our results show that the MB NPs are gradually hydrolyzed to generate boron dihydroxy groups and metal cations while generating a local alkaline microenvironment. This microenvironment greatly enhances boron dihydroxy groups to trap LPS or PGN through an esterification reaction, which not only enhances metal cation-induced bacterial death but also inhibits dead bacteria-induced excessive inflammation both in vitro and in vivo, finally accelerating wound healing. Taken together, this boron-trapping strategy provides an approach to the treatment of bacterial infection and the accompanying inflammation.
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PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 4
·756-765
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IF 4.8
Liu Yunsong,Wang Enhui,Xu Linchao,Yang Tao,He Zhijun,Liang Tongxiang,Hou Xinmei
Different amounts of AlON have been introduced in calcium hexaaluminate (CA 6 ) using two approaches, that is, one-step and two-step methods, to improve the slag resistance of CA 6 . A one-step method can directly sinter the mixtures combining Al 2 O 3 , CaCO 3 , and Al in flowing nitrogen, in which AlON clusters are always formed because of the poor wettability of Al by Al 2 O 3 , leading to the high porosity of CA 6 /AlON composite. In a two-step method, CA 6 and AlON are prepared separately and then mixed and sintered in flowing nitrogen. Compared with the sample prepared by the one-step method, CA 6 and AlON in composite by the two-step method are more uniformly distributed, and the optimized amount of AlON added is 10wt%. The slag corrosion and penetration test shows that the CA 6 /AlON composite using the two-step method exhibits superior slag corrosion protection. The promoted effect of AlON on slag penetration and corrosion resistance is also discussed.
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ACS Applied Nano Materials
·
2022
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IF 6.14
Bao Shi,Lu Chen,Tien-Chien Jen,Xinying Liu,La Li,Aibing Chen,Guozhen Shen
Freestanding and flexible MXene electrodes have exhibited great potential in wearable energy device design through over 10 years of rapid development but are yet limited by the restacking of nanosheets and the complex and lengthy ion transport paths that reduce their performance at high charge–discharge rates. Herein, we provide a molten salt method assisted by a selective etching process for the directional vertical growth of Ti2CTx MXene nanosheets on carbon fiber (CF) substrates, showing several advantages: (1) bifunctional CF, which acts as both a self-supported freestanding flexible substrate and carbon source during the synthesis of the Ti2AlC MAX phase, (2) eliminating the need for collecting the powder Ti2CTx MXene from the acid mixture after the selective etching process and filtration steps to obtain freestanding and flexible MXene films, and (3) the directional vertical arrangement of Ti2CTx shortens the ion diffusion path and the integrated structure of nanosheets and carbon fibers speeds up ion transport. As a result, the fabricated Ti2CTx MXene@CF//Zn@Cu@CF hybrid Zn-ion supercapacitor delivers a high areal capacitance of 380 mF/cm2, an energy density of 52.77 μWh/cm2 at 5 mV/s, excellent stability with 90.06% capacity retention after 10 000 cycles, and 89.76% capacity retention after storing in air for 30 days. The directional vertical Ti2CTx MXene nanosheets can be extended to other application areas, such as sensors, catalysts, detectors, electromagnetic shielding, etc.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Xuesong Li,Xiaofei Ma,Huankai Zhang,Ni Xue,Qian Yao,Tao He,Yi Qu,Jian Zhang,Xutang Tao
MXenes, as attractive two-dimensional materials, have shown extraordinary potential for applications, however, their instability severely limits further research and applications on a large-scale and industrial level. Here, we overcome the environmental instability of MXene-Ti 3 C 2 T x by an optimized synthetic route, including the synthesis of high-quality MAX phase (Ti 3 AlC 2 ) and the post-treatment of Ti 3 C 2 T x . The optimized Ti 3 C 2 T x (O-Ti 3 C 2 T x ) achieves a dramatic improvement in stability. Even at low concentrations (∼0.1 mg/mL), the dark green aqueous dispersion of monolayer O-Ti 3 C 2 T x showed no oxidation and degradation when aged under ambient conditions for two months, while conventional Ti 3 C 2 T x required only ∼ 10 days for complete oxidative degradation under the same conditions. More importantly, compared with the conventional Ti 3 C 2 T x , O-Ti 3 C 2 T x exhibits higher conductivity, better nonlinear optical properties , excellent thermal stability, and comparable biocompatibility. In the application of pulsed laser with MXene as a saturable absorber, the conventional Ti 3 C 2 T x leads to severe degradation of Q-switching performance due to its instability, while O-Ti 3 C 2 T x shows excellent Q-switching performance in long-term operation. This work achieves a substantial solution to the instability problem of MXene-Ti 3 C 2 T x without compromising its excellent performance, paving the way for the development of its practical applications.
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CHEMOSPHERE
·
2022
·
IF 8.943
Zhiyu Wei,Jie Chen,Hongjin Tong,Mingchao Sun,Jing Tian,Lu Fan
CNTs-Al was prepared by ball milling combined with sintering process and then used for CNTs-Al-Cu synthesis with chemical deposition method. The obtained CNTs-Al-Cu composite was systematically characterized and its NO 3 − -N reduction performance under alkaline condition was also evaluated. As indicated by the reduction batch experiment, 80.2% of NO 3 − -N removal efficiency was obtained in 90 min at pH of 9. The product of the reduction process was dominated by NO 2 − -N, which was further reduced to harmless N 2 . The reusability of CNTs-Al-Cu composite was evaluated, and the experiment results showed that 68.1% of NO 3 − -N removal efficiency was maintained after 3 cycles of regeneration. Finally, based on the characterization results and kinetic analysis, it was concluded that micro-electrolysis was mainly responsible for the removal of NO 3 − -N by CNTs-Al-Cu.
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PubMed
高影响因子
FUEL
·
2023
·
IF 7.4
Licheng Liang,Linyan Bian,Yanping Fan,Shuyan Guan,Xianyun Liu,Qunying Sun,Baozhong Liu
The research and development of efficient catalysts is very important for the sustainable utilization of hydrogen energy. Herein, we designed the Ru/Ti 3 C 2−x N x catalysts using N -doped two-dimensional material MXene (Ti 3 C 2−x N x ) as support toward hydrogen generation from ammonia borane (AB) hydrolysis. Due to the confinement and anchoring effects of Ti 3 C 2−x N x , the as-prepared Ru/Ti 3 C 2−x N x catalysts show an ultrafine particle size of 1.55 nm and remarkable AB hydrolysis activity with high turnover frequency (TOF) value of 1334 min −1 and r B value of 297 × 10 3 mL·min −1 ·g Ru −1 at 298 K. XPS results show that the doped N atoms in Ti 3 C 2−x N x support provide electron-feeding effect for Ru in the reaction to form electron-rich Ru. The isotope experiments confirm that the dissociation of H 2 O is the rate-determining step (RDS) in AB hydrolysis reaction catalyzed by Ru/Ti 3 C 2−x N x . According to the density functional theory (DFT) calculations, the N atoms introduced into Ti 3 C 2−x N x decrease the dissociation energy of O–H bond in H 2 O molecules, accelerating the desorption of H* from Ti 3 C 2−x N x surface. This research provides a strategy to enhance synergistic interaction between support and metal through N -doping, so as to effectively improve the catalytic performance of heterogeneous catalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yifan Zhang,Xianwei Hu,Fengguo Liu,Jiaxin Yang,Liyu Chen,Wenju Tao,Aimin Liu,Zhongning Shi,Zhaowen Wang
In the present study, the reaction process and reaction mechanism of the aluminothermic reduction of NaVO 3 to prepare aluminum-vanadium intermediate alloy were investigated by experimental analysis and quantum chemical calculations. The results of thermal analysis and isothermal experiments indicated that the aluminothermic reduction of NaVO 3 was a multi-step process and temperature played a critical role in this process. The aluminum-vanadium intermediate alloy was generated when the temperature exceeded 963 ºC, and it could be further separated from the reduction product after the addition of slag-forming agents (CaO and CaF 2 ) at 1600 ºC. Furthermore, an atomic-level insight into the reaction between aluminum and NaVO 3 was explored based on the electrostatic potential (ESP) analysis of the reactivity of NaVO 3 . The results showed that the aluminum atom first interacted with NaVO 3 to form an intermediate complex through electrostatic interaction , and then NaVO 3 was reduced to NaVO 2 under the continuous action of aluminum. Further, the newly formed NaVO 2 was consequently converted to aluminum-vanadium intermediate alloy under the continuous action of aluminum atoms. These theoretical results were essentially consistent with the experimental data, which provided a fundamental understanding about the reaction mechanism of NaVO 3 with Al. Moreover, the aluminothermic reduction of NaVO 3 also provided a feasible and environmentally friendly metallurgical approach for preparing aluminum-vanadium intermediate alloy.
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高影响因子
Frontiers in Energy Research
·
2023
·
IF 3.4
Yu Runtian,Liu Yanxiong,Liu Guannan,Ying Yaoyao,Li Tianjiao,Liu Dong
The flash ignition as a new ignition method has attracted lots of interest from researchers. The flash ignition can successfully achieve distributed ignition in a short time. To study the flash ignition and combustion characteristics of titanium dioxide mixed with iron nanoparticles and aluminum nanoparticles, an appropriate amount of titanium dioxide was added to the iron nanoparticles and aluminum nanoparticles to form the composite material. The ignition phenomenon of mixture materials was recorded by the high-speed camera and the temperature distribution of ignited materials was calculated by using the two-color method. The minimum ignition energy of mixture materials with different content of titanium dioxide and total mass was measured to analyze the method to decrease the minimum ignition energy. The results showed that the effect of the added titanium dioxide was insignificant on the combustion phenomenon of the iron nanoparticles. The temperature was still maintained at approximately 850 K compared with the pure iron nanoparticles. The minimum ignition energy of the mixture materials increased with the increasing content of titanium dioxide. As for the aluminum nanoparticles, titanium dioxide can enhance the explosion phenomenon occurring at the beginning of the flash ignition. In the exposure process. With the content of titanium dioxide in the range of 0%–20%, the minimum ignition energy of the mixture materials decreased greatly. The content increased to the range of 20%–40%, the minimum ignition energy was neglected. When the content was further increased to higher than 60%, the minimum ignition energy gradually increased until it gets the saturation condition.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zongyu Wang,Haowei Li,Liyan Dang,Zepeng Pu,Zhengguan Xu,Aiping Fu,Hongliang Li
The composites of reduced graphene oxide (rGO) encapsulated porous silicon (P-Si) microspheres are constructed using metallic aluminum as a bi-functional reducing agent at low temperatures. The preparation process of P-Si is carried out in a special reactor at 300 °C. For the reaction, SiO 2 is used as the silicon source and AlCl 3 is added to maintain the smooth progress of the thermite reduction reaction. Subsequently, graphene oxide is reduced by aluminum powder in an acidic liquid phase system and then the P-Si/rGO composite material is constructed by freeze-drying technique. As a kind of promising anode for lithium-ion batteries (LIBs), the porous structure of silicon microspheres can relieve the internal stress caused by volume expansion and shorten the diffusion path of lithium ions during charge/discharge processses. The flexible graphene layers can adapt the volume effect of the P-Si microspheres and therefore maintain the structural stability of the composites and enhance the electrical conductivity . The obtained P-Si/rGO composite material exhibits excellent electrochemical performance, which can maintain a superior capacity of 837 mAh g −1 upon 500 cycles under a current density of 0.5 A g −1 and exhibit satisfied cycling stability with a capacity of 704 mAh g −1 after 1000 cycles at a 1 A g −1 current density.
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高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Mansoor Khan,Mustafa Soylak
Palladium is an important metal as it has a wide range of applications in different fields but can cause cancer in human beings. Therefore, precise quantification of palladium is important. For this purpose, new material Ti 3 AlC 2 max phase having unique properties like high stability, thermal conductivity and environmental friendly has been synthesized. To increase its surface area of Ti 3 AlC 2 max phase, graphene oxide (GO) has been incorporated to form Ti 3 AlC 2 max phase GO nanocomposite. Ti 3 AlC 2 max phase GO nanocomposite was used as solid phase extracting material for microextraction and preconcentration of Pd(II) in environmental samples and medical appliances. Characterization of the adsorbent was achieved by using fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) and surface area analyzer (SAA). All the parameters that influence the extraction efficiency of the adsorbent like solution pH, amount of adsorbent, volume of sample, vortex time, desorption condition and interferences effect were determined and optimized. The limit of detection (0.327 µg/L) and limit of quantification (1.09 µg/L) show that the method is highly sensitive. The relative standard deviation was calculated as 5.48 % for five repeated measurements, which shows that the developed method is reproducible. The method is highly efficient with large values of preconcentration factor (20) and enhancement factors (20). The method was validated by applying the method to real water samples, soil samples and medical appliances with satisfied recovery results (94–106 %).
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yi Liu,Qiqi Jia,Yao Yan,Ningkai Yuan,Wei Luo,Xiaoyan Yuan,Lei Wang,Shouwu Guo
Ti 2 AlC can be used as a microwave absorbent due to its good electrical conductivity. However, Ti 2 AlC powders synthesized using conventional solid phase reaction show low reflection loss (RL) and narrow effective absorption width (EAB), which greatly limits its application in the field of microwave absorption. Herein, porous lamellar Ti 2 AlC powders were firstly synthesized in NaCl/KCl molten salt using Ti powders, Al powders, and starch as reaction precursors, and then they were selectively etched with Lewis acid molten salt (CuCl 2 ) to prepare Ti 2 AlC/Cu/Ti 2 C hybrids. The results indicated that when the mass fraction of porous lamellar Ti 2 AlC powder in paraffin was 40 %, the maximum RL and EAB were −44.15 dB and 2.68 GHz, respectively. After Lewis acid molten salt etching, the RL and EAB of Ti 2 AlC/Cu/Ti 2 C hybrids increased to −54.88 dB and 4.48 GHz, respectively. The improvement of microwave absorption property could be attributed to the enhancement of polarization and conductivity losses caused by the formation of Ti 2 C MXene and copper nanoparticles. This study provides a simple way to tune the microstructure and microwave absorption capability of Ti 2 AlC.
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