CERAMICS INTERNATIONAL
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2022
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IF 5.532
Ming Yan,Jiangtao Huang,Mengliu Yang,Hao Zhang,Yu Zhu,Nengyu Zhou,Juan Wang
MAX phases are layered ternary carbides and nitrides with unique properties, doping transition metals in it is attracting significant attentions for the processing of this relatively new class of materials. In this paper, a magnetic solid solution MAX phase V 2 (Sn 1− x A x )C ( A = Mn, Fe, Co) was synthesized by doping Mn/Fe/Co atoms into V 2 SnC by pressure-less sintering. The XRD results show that when x = 0.4, the characteristic peak shifts to the right, and the substitution reaches saturation. SEM and TEM show that doping does not change the original layered morphology and hexagonal crystal form, but only the lattice constants decrease slightly. Magnetic test results indicate that V 2 (Sn 1− x A x )C is a typical low-temperature magnetic material with a Curie temperature around 60 K, and the magnetization increases with the increase of doping amount. Moreover, we explained the reasons of V 2 SnC doping A-site instead of M-site and the changing trend of the magnetic moments by first-principles calculations, which are consistent with the experimental results.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Junxian Qin,Yun Pei,Yue Zheng,Daiqi Ye,Yun Hu
Fe-MOF derivative (M-300) is successfully prepared by thermal treatment using MIL-100(Fe) as a precursor. The resulting M-300 catalyst displays excellent performance in the degradation of volatile organic compounds (VOCs) and the bacteriostasis to Escherichia coli under the visible light. In addition, the catalyst also exhibits the capacity of acetaldehyde degradation under actual sunlight. The high activity is attributed to the abundant exposure of the unsaturated Fe 2+ active site, which can significantly promote the transfer of photogenerated electron and the oxygen reduction process, thus improving the efficiency of the entire photocatalytic oxidation reaction. This work shows the application prospect of MOFs derivatives in the field of indoor photocatalytic purification, and also provides a new insight into the study of catalyst modification in photocatalytic degradation of pollutants.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Feng Cheng,Yongfei Tong,Yang Liu,Yue Yuan,Zhiqiang Chen,Juan Liang,Yongli Zhang,Peng Zhou,Xiaoguang Duan,Bo Lai
In this study, vanadium powder (V) was employed as a cocatalyst to enhance the Fenton-like system. The V-Fe(III)/H 2 O 2 system can rapidly produce hydroxyl radicals and completely oxidize chloramphenicol with exceptionally high stability for long-term operation. The low-valent vanadium sites on the surface during the stepwise oxidation of vanadium from V 0 to V(IV) can donate electrons for direct H 2 O 2 activation and indirect Fenton reaction by reducing Fe(III) to produce hydroxyl radicals. Meanwhile, density functional theory (DFT) calculation unveils that low-valent vanadium sites of vanadium can lengthen Fe-O bonds of FeOH 2+ to elevate the oxidation potential of Fe(III) and promote Fe(III) reduction induced by H 2 O 2 . The self-cleaning effect of vanadium under acidic conditions can maintain reactive sites for sustainable electron donation and long-lasting enhanced Fenton oxidation. This study provides a novel enhanced Fenton oxidation for water remediation and the first mechanistic insights into the origins of V-based advanced oxidation technologies , it may also be beneficial to treat vanadium-contained wastewater.
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ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Jun Hu,Yifan Qiu,Bing Gu,Nv Yao,Zimo Lou,Zhuowei Cheng,Xianzhao Zhang,Jianming Yu
Zero-valent iron (Fe) is commonly employed as an additive for the mechanochemical destruction (MCD) of organic pollutants . The poly- and perfluoroalkyl substances (e.g., perfluorooctane sulfonate , PFOS) are a class of toxic environmental pollutants that are difficult to effectively degrade due to their thermodynamic and chemical stability. In this study, magnetite (Fe 3 O 4 ) was applied to improve the milling performance of Fe to PFOS and its promoting mechanisms were emphatically explored. The desulfurization rate was in ahead of the defluorination rate because the C–S bond is less stable than the C–F bonds in PFOS. Fe 3 O 4 had an excellent reinforcement effect on the milling performance of Fe, which was mainly through accelerating the electron transfer as a conductor, reacting with Fe to produce FeO, and facilitating the formation of HO ● . During the MCD of PFOS with Fe/Fe 3 O 4 as an additive, HO ● played a dominant role in the defluorination process (accounting for >67%). After the elimination of sulfonate group (−SO 3 − ), the produced radical (C 7 F 15 CF 2 ● ) continued to react through two main pathways: one was the stepwise defluorination after hydrogenation, and the other one was oxidation reaction after alcoholization to yield the corresponding aldehydes and carboxylic acids . The optimum Fe fraction (M Fe ) was 30%, and air atmosphere was more effective than oxygen and nitrogen conditions. This study helps to comprehensively understand the role of Fe 3 O 4 in defluorination and fills the gap of Fe/Fe 3 O 4 application in the MCD of PFASs.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Zhonghao Li,Yuanyuan Yang,Huanong Cheng,Yun Teng,Chao Li,Kangkang Li,Zhou Feng,Hongwei Jin,Xinshun Tan,Shiqing Zheng
The density and viscosity of ferric chloride/trioctylmethylammonium chloride ionic liquid ( r FeCl 3 /[A336]Cl) with different molar ratios ( r = 0.1–0.8) of FeCl 3 to [A336]Cl were measured at temperatures from 313.15 to 358.15 K and atmospheric pressure. The density and viscosity data were fitted by the relevant temperature variation equations, respectively. The variation of density and viscosity with temperature and r was obtained. The solubility of r FeCl 3 /[A336]Cl to H 2 S was measured at temperatures from 318.15 to 348.15 K and pressures from 0 to 150 kPa. The effects of temperature, pressure, and r on the solubility of H 2 S were discussed. The reaction equilibrium thermodynamic model (RETM) was used to fit the H 2 S solubility data, and the average relative error was less than 1.3%, indicating that the model can relate the solubility data well. And Henry's constant and chemical reaction equilibrium constant were obtained by the RETM fitting. The relationships of Henry's constant and chemical reaction equilibrium constant with temperature and r were analyzed.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Ping Wu,Jie Zhang,Jing Li,Yan Zhang,Bo Fu,Ming-Yi Xu,Yi-Feng Zhang,He Liu
The integrated system of microbial electrosynthesis (MES) coupled with chain elongation has been considered a promising platform for carboxylic acids production. However, this biotechnology is still in its infancy, and many limitations are needed to be transcended, such as low electron transfer efficiency between cathode and microbes. In this study, nano zero-valent iron (NZVI) was employed to improve carboxylic acid production in the integrated system, and the promotion mechanisms were revealed. Results suggested that the highest production concentrations of acetate, butyrate, and caproate were observed at 7.5 g/L optimized NZVI dosage, increasing the total yield and coulomb efficiency by 23.7 % and 40.3 % compared to the control. Mechanism studies indicated that the hydrogen and electron released by the anaerobic corrosion of NZVI could be used as additional reducing equivalents, thereby enhancing the electron transfer performance. Besides, NZVI was also proven to facilitate the formation of electroactive biofilms according to the results of biofilm characterization and total DNA. In functional microbes' respect, the moderate NZVI enriched the chain elongator in biofilm, like Clostridium _ sensu-stricto _ 12 , and upregulated the activities of key enzymes of homoacetogenesis and chain elongation metabolic pathways, like carbon-monoxide dehydrogenase and hydroxyacyl-CoA dehydratase. This study provided the evidence and revealed how NZVI assisted carboxylic acid production from CO 2 via chain elongation in MES.
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Materials
·
2023
·Vol. 16
·期 4
·1544
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IF 3.4
Angxuan Wu,Yuchen Zhu,Chen Xu,Nianping Yan,Xuetong Zhao,Xilin Wang,Zhidong Jia
Arc floating in surface flashover can be controlled by reducing the interfacial charge-transfer resistance of ceramics. However, thus far, only a few studies have been conducted on methods of treating ceramic surfaces directly to reduce the interfacial charge-transfer resistance. Herein, we explore the flash sintering behavior of a ceramic surface (3 mol% yttria-stabilized zirconia (3YSZ)) onto which loose metal (iron) powder was spread prior to flash sintering at room temperature (25 °C). The iron powder acts as a conductive phase that accelerates the start of flash sintering while also doping the ceramic phase during the sintering process. Notably, the iron powder substantially reduces the transition time from the arc stage to the flash stage from 13.50 to 8.22 s. The surface temperature (~1600 °C) of the ceramic substrate is sufficiently high to melt the iron powder. The molten metal then reacts with the ceramic surface, causing iron ions to substitute Zr4+ions and promoting rapid densification. The YSZ grains in the metal-infiltrated area grow exceptionally fast. The results demonstrate that spreading metal powder onto a ceramic surface prior to flash sintering can enable the metal to enter the ceramic pores, which will be of significance in developing and enhancing ceramic–metal powder processing techniques.Keywords:flash sintering;room temperature;YSZ;metal powders;arc
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Results in Physics
·
2023
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IF 5.3
Jin Qiu,Wen-Juan Huang,Young Jin Lee,Seung Kim,Xiang-Bai Chen,In-Sang Yang
Magnetism in van der Waals (vdW) materials has recently garnered significant attention due to their potential for advanced applications. In this study, we investigate the magnetic transition in layered MPSe 3 (M = Fe, Mn) bulk flakes utilizing temperature-dependent Raman spectroscopy. Our findings reveal unique features in the Raman spectrum that are strongly correlated with the antiferromagnetic ordering in MPSe 3 . We analyze the spin-dependent Raman scattering modes in MPSe 3 by applying the Suzuki–Kamimura formalism. Consequently, our comparative analyses of the spin correlation function and the reduced magnetization provide compelling evidence of the 2D Ising characteristic especially in FePSe 3 . Our results clearly show the potential of MPSe 3 as a prominent platform for exploring fundamental aspects of low-dimensional magnetism.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lei Jia,Linwen Jiang,Jiawen Hu,Jiawei Jin,Siqin Yan,Anhua Wu,Xiaofeng Zhang
Optimizing the impedance matching via electromagnetic adjustment is considered an effective strategy to accomplish exceptional electromagnetic wave absorption (EMA) performance. Here, we report an efficient and green process to obtain the carbonitriding FeCoNiCr high-entropy alloys (HEAs) with flake-shaped morphology by using organic cyanide (Dicyandiamide, C2H4N4) as nitrogen and carbon sources. The carbonitriding effects on the phase structure, magnetic properties, mechanical hardness, corrosion resistance, high-temperature oxidation resistance, and EMA performances were investigated systematically. The carbonitriding process optimized the impedance match by decreasing the dielectric constant via introducing the nonmetallic C and N. The #CN10 sample exhibited outstanding EMA performances with a minimum reflection loss of −32.3 dB at 7.89 GHz and a broad effective bandwidth of 4.46 GHz, which covered the majority of X-band. In addition, the carbonitriding FeCoNiCr HEAs had great mechanical properties, excellent corrosion resistance, and high-temperature oxidation resistance, indicating excellent adaptability to harsh environments as well as good EMA performances. This work provides a new idea for the preparation and design of carbonitriding EMA materials.
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Nano Research
·
2023
·
IF 9.9
Dong Zhicheng,Xu Yunyun,Wu Can,Chao Jin,Tian Chen,Lin Zhang
Organo-chromium(III) complex is one of the chromium contaminant species, which would transform to high-toxic Cr(VI) during migrating in the environment. Such natural organo-chromium(III) (NOCr) is difficult to remove by traditional degradation or precipitation methods, due to its high stability and solubility. Herein, we demonstrated a novel NOCr removing method by transforming it to certain structures similar to Cr-Fe minerals in nature, through a self-circulating decomplex and immobilization mechanism with nano zero-valent iron (nZVI). Taking chromium glycinate (Cr-Gly) as a probe, nZVI showed a high Cr removal efficiency of 99.4% under ambient conditions. The removal process included three stages of adsorption, decomplexation, and re-immobilization. Cr-Gly was first adsorbed on the surface of nZVI by chemisorption of the oxide shell. Then, the adsorbed Cr-Gly was decomplexed and oxidized to Cr(VI) by ·OH and 1 O 2 , which were generated from molecular oxygen activated by nZVI. Meanwhile, the released Cr(VI) could be in-situ adsorbed and re-reduced to Cr(III), which was further immobilized in form of Cr-O-Fe complex. As the Cr-O-Fe complexing structure was similar to that of Cr-Fe minerals (such as chromohercynite) in nature, this work explored a novel and efficient NOCr removing method that was potential to weaken chromium pollution in the environment.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Li Gong,Jingting Chen,Yao Hu,Kai He,Eric J. Bylaska,Paul G. Tratnyek,Feng He
Chloroform (CF) is a widely used chemical reagent and disinfectant and a probable human carcinogen. The extensive literature on halocarbon reduction with zerovalent iron (ZVI) shows that transformation of CF is slow, even with nano, bimetallic, sulfidated, and other modified forms of ZVI. In this study, an alternative method of ZVI modification─involving simultaneous sulfidation and nitridation through mechanochemical ball milling─was developed and shown to give improved degradation of CF (i.e., higher degradation rate and inhibited H2 evolution reaction). The composite material (denoted as S–N(C)–ZVI) gave synergistic effects of nitridation and sulfidation on CF degradation. A complete chemical reaction network (CRN) analysis of CF degradation suggests that O-nucleophile-mediated transformation pathways may be the main route for the formation of the terminal nonchlorinated products (formate, CO, and glycolic polymers) that have been used to explain the undetected products needed for mass balance. Material characterizations of the ZVI recovered after batch experiments showed that sulfidation and nitridation promoted the formation of Fe3O4 on the S–N(C)–ZVI particles, and the effect of aging on CF degradation rates was minor for S–N(C)–ZVI. The synergistic benefits of sulfidation and nitridation on CF degradation were also observed in experiments performed with groundwater.
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CHEMOSPHERE
·
2023
·
IF 8.8
Yingqian Zhang,Zhifei Ma,Xianchuan Xie,Daishe Wu,Xing Peng,Jianlong Li
Zero-valent iron (ZVI) is a promising technology for groundwater treatment , and its efficiency primarily depends on the electron transfer . However, there are still some problems such as low electron efficiency of ZVI particles and high yield of iron sludge that limits the performance, which warrant further investigation. In our study, a silicotungsten acidified ZVI composite (m-WZVI) was synthesized by ball milling to activate PS to degrade phenol. m-WZVI has a better performance on phenol degradation (with a removal rate of 91.82%) than ball mill ZVI(m-ZVI) with persulfate (PS) (with a removal rate of 59.37%). Compared with m-ZVI, the first-order kinetic constant (k obs ) of m-WZVI/PS is 2–3 times higher than that of the others. Iron ion was gradually leached in m-WZVI/PS system, being only 2.11 mg/L after 30 min, having to avoid excessive consumption of active substances. The underlying mechanisms of m-WZVI for PS activation mainly include: 1) were elucidated through different characterizations analyses that accounted for silictungstic acid (STA) can be combined with ZVI, and a new electron donor (SiW 12 4− ) was obtained, which improved the transfer rate performance of electrons for activating PS; 2) singlet oxygen ( 1 O 2 ) is the main active substance for phenol degradation, but other radicals also played an important role. Therefore, m-WZVI has good prospects for improving the electron utilization of ZVI.
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