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Effect of the chloride ion on advanced oxidation processes catalyzed by Fe-based metallic glass for wastewater treatment

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Journal of materials science & Technology 2022年第22期117卷 49-58页

作者： Shuangqin Chen Mai Li Qingmin Ji Tao Feng Si Lan KeFu Yao School of Material Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and TechnologyNanjing 210094China School of Material Science and Engineering Tsinghua UniversityBeijing 100084China School of Material Science and Engineering Nanjing Institute of TechnologyNanjing 211167China

Fe-based metallic glasses (Fe–MGs) are potential candidate catalysts for advanced oxidation processes(AOPs) for recalcitrant organic pollutant degradation. However, industrial wastewater and natural contaminated sites usually contain abundant inorganic ions, like the chloride ion (Cl−), which significantly affectAOPs, but their influence on MG-activated AOPs still remains unclear. Through the study of three commonly used oxidants, hydrogen peroxide (H_(2)O_(2)), peroxydisulfate (PDS), and peroxymonosulfate (PMS), theeffect of Cl− on the FeSiB-catalyzed process of degradation of the typical azo dye Orange Ⅱ was investigated. Evidence indicates that the addition of Cl− resulted in the monotonous inhibition of the degradation process when the H_(2)O_(2)/FeSiB and PDS/FeSiB systems were employed, but promoted effect wasdetected with the PMS/FeSiB system, which is different from the previously observed dual effect of Cl−.It is closely relative with FeSiB induced unique variety of degradation pathways, including radicals, nonradicals (^(1)O_(2)), and direct reduction degradation. Moreover, the presence of Cl− significantly affected thesystems’ absorbable organic halogen content and the amount of Fe leached into the solution. The resultsof this work will provide essential references for Fe-based MG used as AOP catalysts in field applicationsand the development of advanced MGs with excellent adaptability to complex environments.

关键词： Fe-based metallic glass Advanced oxidation processes Wastewater treatment Chlorine ion

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Mechanical properties,thermophysical properties and electronic structure of Yb^(3+)or Ce^(4+)-doped La_(2)Zr_(2)O_(7)-based TBCs

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Journal of Rare Earths 2023年第4期41卷 588-598页

作者： Pengsen Zhao Haizhong Zheng Guifa Li Yongxiang Geng Yixin Xiao Hongbo Guo Ping Peng school of materials science and engineering Beihang UniversityBeijing 100191China School of Material Science and Engineering Nanchang Hangkong UniversityNanchang 330063China School of Material Science and Engineering Hunan UniversityChangsha 410082China

First-principles calculations based on density functional theory were perfo rmed to investigate the cohesive energies,elastic modulus,Debye temperatures,thermal conductivities and density of states of La_(2-x)Yb_(x)Zr_(2)O_(7),La_(2)Zr_(2-x)Ce_(x)O_(7)and La_(2-x)Yb_(x)Zr_(2-x)Ce_(x)O_(7)(x=0.00,0.25,0.50,0.75,1.00)ceramics.The results show that doping Yb~(3+)or Ce~(4+)into La_(2)Zr_(2)O_(7)reduces its elastic modulus,thermal conductivity and Debye temperature.Compared with La_(2-x)Yb_(x)Zr_(2)O_(7)(x≠0.00),La_(2)Zr_(2-x)Ce_(x)O_(7)compounds have better ductility and lower Debye te mperature.The Debye temperature values of La_(2)Zr_(2-x)Ce_(x)O_(7)(x≠0.00)co mpounds are in the range of 485.0-511.5 K.Among all components,the fluorite-type La_(2-x)Yb_(x)Zr_(2-x)Ce_(x)O_(7)(x=0.75,1.00)compounds exhibit better mechanical and thermophysical properties,and their thermal conductivity values are only 1.213-1.246 W/(m·K)(1073 K),which are 14.5%-16.7%lower than that of the pure La_(2)Zr_(2)O_(7).Thus,our findings open an entirely new avenue for TBCs.

关键词： First-principles calculations La_(2)Zr_(2)O_(7) Thermal conductivity Debye temperature Rare earths

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Enhanced visible light absorption of Bi2WO6/SiO2 with abundant adsorbed oxygen for the degradation of organic pollutant

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Particuology 2024年第5期88卷 210-217页

作者： Yuanting Wu Xiaoying Wang Wenlong Zhong Shan Zhang School of Material Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China

Heterogeneous photocatalysts exhibit high catalytic efficiency in the degradation of pollutants,but their stability and repeatability is not very good and requires high structural matching.Simply by nanosizing the pure Bi 2 WO6(BWO)photocatalyst without constructing a heterojunction,there is a significant improvement in its performance,with an enhancement effect of about 2.3 times(99.43%).The high photocatalytic degradation efficiency of the material can be attributed to the enhanced light absorption effect brought by the three-dimensional inverse-opal structure SiO 2(IS)and the abundant surface adsorbed oxygen generated after the formation of Si–O–W bonds.In addition,the introduction of IS greatly increases the surface area of nanostructured BWO,which accelerates the charge transfer process,while the adsorbed oxygen promotes the participation of·O2−in the photocatalytic reaction,thereby accelerating the consumption of photo-generated electrons and ultimately improving the separation of charge carriers.Furthermore,the matched photonic bandgap further improves the absorption and utilization of light of the material.In this work,we constructs Si–O–W bonds to obtain inverse-opal SiO2/Bi2 WO6 with uniformly growth of pure phase nano BWO,which provides a feasible strategy for the preparation of high-performance pure-phase photocatalysts.

关键词： Bi2WO6 SiO2 inverse-opal structure Photocatalysis Adsorbed oxygen

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Polyoxometalates-derived ternary metal oxides electrocatalyst for N_(2) reduction under ambient conditions

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Tungsten 2024年第2期6卷 428-437页

作者： Meng-Le Yang Zhong-Xin Jin Xi-Xian Cao Xin-Ming Wang Hui-Yuan Ma Hai-Jun Pang Gui-Xin Yang The school of material science and Chemical engineering Harbin University of Science and TechnologyHarbin 150040China

Accelerating the breaking of the nitrogen nonpolar bond(N≡N)is an important factor to improve the effi ciency of the electro-catalytic nitrogen reduction reaction(e-NRR).In this work,polyoxometalates-derived FeMo-based ternary oxide materials MoO_(2)-Mo_(4)O_(11)-FeMoO_(4)@X(abbreviated as MoFeO@X,X represents the synthesis temperature of 650,750 and 850℃)were designed and synthesized for e-NRR under ambient conditions.The scanning electron microscopy images of MoFeO@750 show an ellipsoidal-like structure(0.86×0.6μm).The relatively large specifi c surface area,formation of multiple interfaces,together with the synergistic eff ect of iron and molybdenum bimetals,would make MoFeO@X catalyst more easily absorb and activate N_(2)in the e-NRR.Expectedly,the synthesized MoFeO@750 shows an optimal NH_(3)production rate of 16.57μg·h^(−1)·mg cat.^(−1)and Faradaic effi ciency of 12.33%at−0.3 V versus reversible hydrogen electrode(νs.RHE),with outstanding electrochemical and structural stability.

关键词： Polyoxometalates Electrocatalytic nitrogen reduction reaction Ternary oxide Electrocatalyst

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Mechanism exploration of enhanced electrochemical performance of single-crystal versus polycrystalline LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)

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Rare Metals 2022年第11期41卷 3783-3794页

作者： Tian-Yi Zeng Xiao-Yun Zhang Xing-Yu Qu Mei-Qing Li Pan-Pan Zhang Ming-Ru Su Ai-Chun Dou Ahmad Naveed Yu Zhou Yun-Jian Liu School of Material Science and Engineering Jiangsu UniversityZhenjiang212013China

Single-crystal LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(SC-811),which offers better cycle performance compared to the polycrystalline counterpart,has received great attention.We report herein the synthesis of SC-811 with a grain size of 2-4μm by washing and reheating method,which compares with conventional polycrystalline LiNi_(0.8)-Co_(0.1)Mn_(0.1)O_(2)(PC-811).The discharge capacity of SC-811 reaches 152.1 mAh·g^(-1)after 100 cycles(86.7%capacity retention)at 1.0 C,which is much better than that of PC-811(130.2 mAh·g^(-1),73.8%capacity retention).By using multiscale characterization,the results unveil that SC-811 can not only improve the reversibility of the H2-H3 phase transitions,suppress the generation of micro-cracks and phase transformations,but also mitigate the undesired side reactions between electrode and electrolyte.Besides,the Li-O bond of SC-811 is longer than that of PC-811,which is conducive to the de-intercalation of Li-ions,thereby enhancing the structural stability.This finding provides an impressive strategy to sustain structural stability and improve the cycling life of Ni-rich layered cathodes.

关键词： Li-ion batteries(LIBs) Cathode materials Single-crystal Capacity retention Phase transitions

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Characteristics on microstructure and mechanical performances of 6111Al influenced by Ce-containing precipitates

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Journal of Rare Earths 2022年第1期40卷 153-160页

作者： Xu Gao Yutao Zhao Xizhou Kai Wei Qian Liwei Jin Chuang Guan Peng Sheng School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China

In this work,the effects of Ce addition(0,0.1 wt%,0.3 wt%,0.5 wt%and 0.7 wt%)on the evolution of microstructure and mechanical properties of 6111 Al alloy and strengthening mechanism of 6111 Al-Ce alloy were systematically investigated by a polarizing microscope,a scanning electronic microscope,an energy dispersive spectroscope and a high-resolution transmission electron microscope.The results indicate that with 0.3 wt%Ce addition,theα-Al grains show the equiaxed crystal morphology with the average size decreasing from 137 to 57μm and numerous small AlCeSi phases with lump-like or platelike morphology are distributed closely along the grain boundary.The peak yield strength,ultimate tensile strength and elongation of 6111 Al-Ce alloy reach to 279 MPa,316 MPa and 12.1%,respectively,which is attributed to the grain refinement strengthening and the formation of nanosized Al11Ce3 precipitates.Eventually,this investigation gives us instructive suggestion to prepare the new kind of aluminum alloy with high strength and high ductility.

关键词： Grain refinement Precipitation strengthening Orowan strengthening Microstructure Mechanical properties Rare earths

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Radially loading rotary extrusion for manufacturing large-size conical cylinders with inner transverse high ribs

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Chinese Journal of Aeronautics 2023年第5期36卷 582-594页

作者： Zhe CHEN Zhimin ZHANG Jie ZHENG Yong XUE School of Material Science and Engineering North University of ChinaTaiyuan 030051China

The Large-size Conical Cylinders with Inner Transverse High Ribs(LCCWITHR) can reduce the weight of the parts while maintaining high rigidity and strength. Radially Loading Rotary Extrusion(RLRE) forming technology can achieve integral forming of LCCWITHR through the synergy of radial and rotary movements of dies. The flow law of the material during the forming process is the key to forming large-size inner ribs. At present, there is no unified understanding of the metal flow law of RLRE forming technology. An analytical expression was derived to predict the Radial Direction(RD) deformation loads. The FE simulation and process experiment were carried out to investigate the effects of the inclination angle, thickness factor and transition arc radius of the split top dies on the spacing of the metal diversion plane, the metal flow velocity of the rib area and the final radius of the inner rib. The influence of the split top dies loading distance and the bottom die rotation angle of each pass on the inner radius of the inner rib was verified. And the optimal combination of dies shape parameters and loading paths which can make the metal flow orderly was obtained: the inclination angle is 140°, the thickness factor is 3.64, the transition arc radius is 16 mm;the top dies loading distance is 15 mm, the bottom die rotation angle is 45°.The FE simulation results have been found to be in close agreement with physics experiment.The research results reveal the metal flow law of rib growth in the RLRE of LCCWITHR, which lays a theoretical foundation for subsequent thorough research and process optimization.

关键词： Extrusion molding Rotary extrusion Radially loading Inner transverse rib Metal flow law Conical cylinder

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Hydrothermal Desulfurization on Porous Sulfonated CFR-PEEK Surface Structure Used for Implant Application

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Journal of Bionic engineering 2023年第2期20卷 748-761页

作者： Jingdan Li Wen Qin Patrick Osei Lartey Yulong Fu Jing Ma School of Material Science and Engineering Taiyuan University of TechnologyTaiyuan030024China

The poor wear resistance and bio-inertness surface of polyetheretherketone(PEEK)limits the implant applications of PEEK and its composites.Carbon fiber(CFR)was used to boost the wear resistance of PEEK;however,the bioactivity of carbon fiber-reinforced polyetheretherketone(CFR-PEEK)composites is even worse.The bioactivity of CFR-PEEK can be enhanced by constructing 3D porous structure.Nevertheless,large number of sulfur component introduced by sulfonation shows cytotoxicity and can cause damage to human cells.Besides,the sulfur component affects the cytotoxicity and bioactivity of sulfonated CFR-PEEK(SCFR-PEEK).Hydrothermal treatment can sweep away the sulfur component in the 3D porous structure of SCFR-PEEK.Meanwhile,the changes in crystallinity and hardness after hydrothermal treatment may also affect the wear resistance.Therefore,the effect of hydrothermal temperature on wear resistance,cytotoxicity and bioactivity of SCFR-PEEK were studied.In this work,the samples with hydrothermal temperature 90–120℃exhibited high wear resistance.The 3D pore structure of SCFR-PEEK unchanged after hydrothermal treatment,and the sulfur component in the 3D pore structure gradually decreased with increasing hydrothermal temperature by SEM images and EDS analysis.In addition,SCFR-PEEK treated in 90–120℃.Exhibited low cytotoxicity and high bioactivity,which is beneficial for the implant materials.

关键词： Biomaterials Hydrothermal treatment Cytotoxicity Microstructure Surface structure

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Wear Resistance, Cytotoxicity and Antibacterial Properties of Polyetheretherketone Composite Modified by Carbon Fiber and Black Phosphorus

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Journal of Bionic engineering 2022年第1期19卷 155-166页

作者： Jingdan Li Qian Liang Wen Qin Jing Ma School of Material Science and Engineering Taiyuan University of TechnologyTaiyuan030024China

High wear resistance,low cytotoxicity and excellent antibacterial properties are the basis for osseointegration of implant materials.Polyetheretherketone(PEEK)has been considered as a potential implant material due to its excellent biocompatibility,natural radiolucency and mechanical properties.In this work,to improve the wear resistance,cytotoxicity and antibacterial properties of PEEK,carbon fiber(CFR)and Black Phosphorus(BP)were used to synergistically modify PEEK by two methods,deposition of BP coating on CFR-PEEK and BP/CFR-PEEK coating on Ti6Al4V(TC4)through electrostatic spraying.After CFR and BP synergistically modified PEEK,the friction coefficient of BP coating on CFR-PEEK and BP/CFR-PEEK coating were 0.14±0.01 and 0.09±0.02,respectively.The wear volume of BP coating on CFR-PEEK(30.54±1.32)was higher than that of BP/CFR-PEEK coating(9.46±1.32),which indicated that BP/CFR-PEEK coating showed high wear resistance.The difference in wear resistance may be caused by the fact that BP was not easily oxidized in BP/CFR-PEEK coating.In addition,BP coating on CFR-PEEK and BP/CFR-PEEK coating showed no obvious cytotoxicity to L929 cell and presented excellent antibacterial efficiency(up to 94.5%±2.8%and 96.0%±3.8%,respectively)against Staphylococcus aureus(S.aureus).It was concluded that BP/CFR-PEEK coating exhibited high wear resistance,low cytotoxicity and excellent antibacterial properties against S.aureus,which might provide a foundation for osseointegration of implants.

关键词： Surface deposition Electrostatic spraying Wear resistance Cytotoxicity Antibacterial properties

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Metallurgy of aluminum-inspired formation of aluminosilicate-coated nanosilicon for lithium-ion battery anode

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Rare Metals 2022年第6期41卷 1880-1888页

作者： Yu Zhou Peng-Hu Niu Zhong-Hua Li Pan-Pan Zhang Ming-Ru Su Ai-Chun Dou Xiao-Wei Li Yun-Jian Liu School of Material Science and Engineering.Jiangsu University Zhenjiang 212013China

Modification of Si anode with various coating matrixes is a promising strategy to resolve the unsta-ble solid electrolyte interphase issues.However,the com-plex preparation process and inherently weak interaction between Si and other matrixes impede its practical appli-cation.Inspired by the metallurgical process of aluminum,an aluminosilicate matrix was prepared as coating layer on the surface of Si nanoparticles after heat treatment.Si nanoparticles with a uniform native oxide layer were used as seed crystals for the adsorption of aluminum hydroxide.The strong symbiosis and bond between alumina and silica,such as mullite(3Al_(2)O_(3)·2SiO_(2))or kaolin(Al2O_(3)·SiO_(2)·2H_(2)O),provide homogeneous and durable contact coating layer.The as-produced Si/SiO_(2)·Al_(2)O_(3)composite delivers a charge capacity of 1440 mAh·g^(-1)at 100 mA·g^(-1)and remains 879 mAh·g^(-1)at 3 A·g^(-1).After 200 cycles,the capacity retention remains high at 76%.The enhanced properties were ascribed to SiO_(2)·Al_(2)O_(3)syner-gistic composite coating layer,which could hinder the interfacial side chemical reaction and buffer volume change of Si.

关键词： Lithium-ion batteries Silicon anode Alumina coating Interface stability

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