INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Si-Jia Guan,Peng Zhang,Shen-Jing Ji,Yu Cao,Nian-Tzu Suen
It is well known that the “iron” impurity will influence the oxygen evolution reaction (OER) in an alkaline electrolyte, especially for the Ni-based electrocatalyst. Many research studies have investigated the function of Fe in the OER active phase, such as M(OH)2/MOOH (M = Ni and/or Fe), while, surprisingly, very few studies have examined the function of Fe in the “precatalyst” system. Accordingly, in this work, the Ni3–xFexP (x = 0, 0.5, 1) series as an Ni-based precatalyst was employed to inspect the function of internal and external Fe in the Ni-based precatalyst system. It was realized that the sample with internal Fe (i.e., Ni2.5Fe0.5P and Ni2FeP) exhibits efficient OER activity compared to that of the Fe-free one (i.e., Ni3P) owing to the large amount of active M(OH)2/MOOH formed on the surface. This indicates that the internal Fe in the present system may have the ability to facilitate the phase transformation; it was later rationalized from electronic structural calculations that the d band center of the internal Fe (middle transition metal) and Ni (late transition metal) holds the key for this observation. Adding excessive ferrous chloride tetrahydrate (FeCl2·4H2O) as the external Fe in the electrolyte will greatly improve the OER performances for Ni3P; nevertheless, that the OER activity of Ni2FeP is still much superior than that of Ni3P corroborates the fact that the Fe impurity is not the only reason for the elevated OER activity of Ni2FeP and that internal Fe is also critical to the phase transformation as well as OER performance.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Jiacheng Liu,Yongyu Ding,Wen Qiu,Qunpeng Cheng,Chenxi Xu,Guozhi Fan,Guangsen Song,Bo Xiao
In this paper, the effects of nano-zero valent iron (nZVI) on anaerobic digestion of sulphate wastewater with different SO42−/COD ratios, including the COD removal rate, methane yield, intermediate products and the change of microbial community structure, were investigated. The results showed that nZVI could effectively enhance the treatment efficiency and methane yield. Compared with the control group without nZVI, the methane yield increased from 348.6833 to 1007.05 mL CH4/gCODremoval with 4 g nZVI loading at SO42−/COD = 0.1. nZVI could make electron flow from sulphate reduction to methane production, which increased methane yield even at high sulphate concentration. The microbial community analysis showed that adding nZVI could increase the abundance of acetoclastic methanogens, which accelerated hydrolysis acidification.
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CRYSTAL GROWTH & DESIGN
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2022
·
IF 4.01
Chuqi Wang,Bo Jiang,Yulin Qin,Bo Peng,Yue Tang,Shixue Guan,Junpu Wang,Mengxi Zhao,Lu Zhang,Zili Kou
A highly amorphous Fe70Ti2Y6B22 bulk alloy, with a diameter of 3 mm and a height of 2 mm, was synthesized by applying isothermal compression from 10 to 15 GPa at 1473 K using mixed metal powder. The structural analyses by performing X-ray diffraction and transmission electron microscopy revealed that the alloy was composed of a glassy structure. According to the differential scanning calorimetry analysis, a large supercooled liquid region (ΔTx) of approximately 550 K was obtained, which is caused by the highly densely packed structures of a highly amorphous Fe70Ti2Y6B22 bulk alloy. The value was six times the value obtained by rapid cooling. Also, the Vickers hardness of the sample was approximately 8.5 GPa at a loading force of 29.4 N. These results indicated that isothermal compression under high pressure is a feasible method for fabricating bulk metallic glasses satisfying large-size requirements.
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FUEL
·
2022
·
IF 8.035
Jianan Niu,Xin Kong,Qirui Che,Qingxia Li,Jin Yuan,Jianguo Liu,Yongmei Zhang
Fe 0 above the micro size (zero valent iron; ZVI) can effectively eliminate or inhibit excessive acidification during anaerobic digestion of the organic fraction of municipal solid waste, particularly at high organic loading rates. However, the role of nanoscale ZVI (NZVI) in anaerobic digestion remains controversial. In this study, the effect of NZVI at different dosages (0.4, 0.5, 0.6, 0.7, 0.8 g/g volatile solids [VS]) on the anaerobic digestion stability of the organic fraction of municipal solid waste was investigated and compared with the performance of ZVI, as were its effects on microbial syntrophism. Similarly to ZVI, NZVI recovered methane production from excessive acidification conditions, but the optimal NZVI dosage (0.4 g/gVS) was far lower than that for ZVI (0.8 g/gVS), and eventually the methane yield reached 324 mL/gVS. Microbial structure changes coupled with substance transformation revealed that NZVI enhanced the metabolism of hydrogenotrophic methanogens for interspecies hydrogen transfer and acetotrophic methanogens.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 15
·12476-12489
·
IF 2.779
Wang Xinyang,Wei Shicheng,Liang Yi,Dong Chaofang,Wang Yujiang,Huang Yuwei,Li Linwei,Wang Bo
RGO/Fe 3 O 4 /FeCO 3 -based composite was prepared by a one-step hydrothermal method. The microscopic morphology and structure were studied using analytical techniques including scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The electromagnetic parameters and the wave absorption properties of the composite/paraffin mixture were analyzed by the vector network analyzer. It is divulged that the FeCO 3 spheres, Fe 3 O 4 spheres, and the RGO sheets form a fluffy structure rich in microscopic cavities, as well as a good conductive network through the sphere–sheet and sphere–sphere interlap mechanisms, which significantly improves the absorbing performance of the composite. The composite can achieve a maximum reflection loss of − 37.9 dB at a frequency value of 13.9 GHz with a matching thickness of only 6.8 mm. The matching thickness can be adjusted in the range of 5.2–10.0 mm in order to attain a flexible adjustment of the effective microwave absorption band of 9.9–18.0 GHz. Combined with the first-principles calculations, compositing reduces the electron migration energy barrier and thus improves the charge transferring capability. Meanwhile, the interaction of the different components leads to the formation of a special charge transferring channel and the increase of carrier concentration, which enhances the charge transport, as well as the absorbing capacity of the absorbing material.
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Frontiers in Physics
·
2022
·
IF 3.718
Qi Bao-tao,Guo Jun-Jie,Miao Ying-qing,Zhong Mian-zeng,Li Bo,Luo Zi-yan,Wang Xi-guang,Nie Yao-zhuang,Xia Qing-lin,Guo Guang-hua
The emergence of two-dimensional (2D) van der Waals magnetic materials has attracted enormous attention due to their novel physical phenomena and potential application in the fields of spintronics and information storage technology. Here, we systematically study the magnetic and transport properties of a van der Waals antiferromagnetic material, FeNbTe2. The magnetic and magnetoresistance measurements verified its antiferromagnetic properties, spin glass state, and negative magnetoresistance effect at lower temperatures. In addition, the measurement results of transport also show the existence of angle-dependent anisotropic magnetoresistance in a wide temperature range and anisotropic magnetoresistance inversion in a certain temperature range.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Ke Lei,Jiaming Bao,Xiangyu Zhao,Hao Wang,Deqiu Zou
Due to the advantages of high thermal conductivity, high heat storage density per unit volume and large specific surface area, metal-based microencapsulated phase change material (MEPCM) has a broad application prospect in the field of medium/high-temperature heat storage. However, the problems of thermal expansion and large supercooling seriously restrict its development and application. Our previous research work showed that “double-layer coating, sacrificial inner layer” method can successfully solve the thermal expansion problem of metal-based MEPCM. Based on this method, we aim to further investigate the supercooling suppression of metal-based MEPCM by loading nanoparticles into the core material skillfully when sacrificing the inner layer. Phase change properties of three kinds of MEPCM loaded with different nanoparticles (nano-BN, nano-diamond, and nano-Fe) with the same concentration were compared. It was found that the supercooling suppression effect of nano-Fe was the best. Furthermore, supercooling suppression effect of nano-Fe with different concentrations was compared. The results demonstrated that nano-Fe with a concentration of 0.9% showed the best supercooling suppression effect. In addition, supercooling suppression effect of different particle sizes was compared. The results showed that the supercooling degree of MEPCM decreased by 41.5% and 5.6% when nano-Fe with a particle size of 50 nm and 100 nm was loaded, respectively, indicating that nano-Fe with the particle size of 50 nm is more effective than that of 100 nm. Finally, supercooling suppression effect of different coating methods was compared. The results showed that the supercooling suppression effect of “double-layer coating, sacrificial inner-layer” is much better than that of single-layer coating.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Jingdong Yang,Yu Li,Zequn Yang,Kaimin Shih,Guang-Guo Ying,Yong Feng
The presence of 1,4-dioxane in various water streams poses a threat to the health of human beings. In this study, the oxidative combination of ozone with peroxymonosulfate (PMS) was for the first time used to remove 1,4-dioxane from water. Near complete abatement of 1,4-dioxane was achieved by ozone-PMS after reaction of only 15 min and the degradation kinetics was found to be positively correlated with doses of PMS and ozone. Ozone-PMS oxidation had the optimum performance at slight base pH values. Both sulfate radicals and hydroxyl radicals were generated in ozone-PMS oxidation and these radicals resulted in the degradation of 1,4-dioxane. The effects of common water constituents and real water matrices were investigated. It was found that bicarbonate ions with a concentration up to 10 mM had a slight promoting effect, while either chloride ions or natural organic matter inhibited only slightly the degradation. Meanwhile, no obvious difference in the degradation of 1,4-dioxane was found among the real water matrices and deionized water , which demonstrates that ozone-PMS oxidation has high tolerance and stability. The results from this study demonstrate that ozone-PMS may be a promising technology for the removal of 1,4-dioxane from various water matrices.
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ACS Nano
·
2022
·
IF 18.027
Guanghao Li,Suping Ma,Zhuo Li,Yawen Zhang,Jianglin Diao,Lun Xia,Zhiwei Zhang,Yi Huang
A high-quality Fe3GeTe2 single crystal with good electrical, magnetic, and electromagnetic wave absorption and shielding properties was prepared in a large quantity (10 g level) by solid-phase sintering and recrystallization method, which would promote its in-depth research and practical application. It has good room-temperature electrical properties with a mobility of 42 cm2/V·s, a sheet (bulk) carrier concentration of +1.64 × 1018 /cm2 (+3.28 × 1020 /cm3), and a conductivity of 2196.35 S/cm. Also, a Curie temperature of 238 K indicates the high magnetic transition temperature and a paramagnetic Curie temperature of 301 K shows the large ferromagnetic–paramagnetic transition zone induced by the residual short-range ferromagnetic domains. Particularly, Fe3GeTe2 is in a loosely packed state when used as a loss agent; the electromagnetic wave absorption with a reflection loss of −34.7 dB at 3.66 GHz under thin thickness was shown. Meanwhile, the absorption band can be effectively regulated by varying the thickness. Moreover, Fe3GeTe2 in a close-packed state exhibits terahertz shielding values of 75.1 and 103.2 dB at very thin thicknesses of 70 and 380 μm, and the average shielding value is higher than 47 dB, covering the entire bandwidth from 0.1 to 3.0 THz. Furthermore, by using Fe3GeTe2 as a patch, the wideband radar cross-section can be effectively reduced by up to 33 dBsm. Resultantly, Fe3GeTe2 will be a promising candidate in the electromagnetic protection field.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yujiao Wen,Meng Liu,Shikai Li,Lezhu Su,Yifan Wang,Zhi Zhou,Nan Zhou,Ruilian Li
Antibiotics accumulated in ecosystem can easily enter the agricultural cycle with irrigation water, which brings a huge potential threat to food security. Transition metals are widely utilized in advanced oxidation processes to degrade pollutants, but the poor stability has significantly impeded their application in irrigation water. To solve these problems, the harmless tetrasodium iminodisuccinate is selected to pyrolysis with ferrite and cobalt resources to obtain a composite heterogeneous catalyst composed of porous carbon and Co 3 Fe 7 , CoFe 2 O 4 (IDC@Co 3 Fe 7 /CFO). The catalyst exhibits excellent catalytic performance in peroxydisulfate (PDS) activation and shows a high removal efficiency of sulfamethazine up to 100%. The ESR analysis proves SO 4 • − , •OH and •O 2 – are the main active substances, and sulfamethazine can be gradually degraded until mineralization. More importantly, with the formation of Metal-Metal/Metal-Oxygen bonds and the protection of the IDS derived carbon, the dispersion and stability of the metal can be greatly promoted. The composite can maintain the rate of degrading sulfamethazine above 93.44% after 10 times catalytic reactions , with extremely low detection of Fe or Co leaching. This study not only give a super-stable material for the removal of antibiotics in irrigation water, but also provides a novel stratagem for obtaining stable catalytic structures.
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ADVANCED MATERIALS
·
2022
·Vol. 34
·期 34
·2201888
·
IF 32.086
Mengmeng Sun,Kai Fung Chan,Zifeng Zhang,Lu Wang,Qinglong Wang,Shihao Yang,Shannon Melissa Chan,Philip Wai Yan Chiu,Joseph Jao Yiu Sung,Li Zhang
Biofilm eradication from medical implants is of fundamental importance, and the treatment of biofilm-associated pathogen infections on inaccessible biliary stents remains challenging. Magnetically driven microrobots with controlled motility, accessibility to the tiny lumen, and swarm enhancement effects can physically disrupt the deleterious biostructures while not developing drug resistance. Magnetic urchin-like capsule robots (MUCRs) loaded with magnetic liquid metal droplets (MLMDs, antibacterial agents) are designed using natural sunflower pollen, and the therapeutic effect of swarming MUCR@MLMDs is explored for eradicating complex mixtures of bacterial biofilm within biliary stents collected from patients. The external magnetic field triggers the emergence of the microswarm and induces MLMDs to transform their shape into spheroids and rods with sharp edges. The inherent natural microspikes of MUCRs and the obtained sharp edges of MLMDs actively rupture the dense biological matrix and multiple species of embedded bacterial cells by exerting mechanical force, finally achieving synergistic biofilm eradication. The microswarm is precisely and rapidly deployed into the biliary stent via endoscopy in 10 min. Notably, fluoroscopy imaging is used to track and navigate the locomotion of microswarm in biliary stents in real-time. The microswarm has great potential for treating bacterial biofilm infections associated with medical implants.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Xiaojian Liao,Maoyou Ye,Jialin Liang,Zhijie Guan,Shoupeng Li,Yanghong Deng,Qiaowei Gan,Zihang Liu,Xiaodi Fang,Shuiyu Sun
The recovery of metals from spent LiCoO 2 batteries (SLBs) is essential to avoid resource wastage and the production of hazardous waste . However, the major challenge in regard to recovering metals from SLBs using traditional bioleaching is the low Co yield. To overcome this issue, a mixed culture of Acidithiobacillus caldus and Sulfobacillus thermosulfidooxidans was designed for use in SLBs leaching in this study. With the assistance of Fe 2+ as a reductant, 99% of Co and 100% of Li were leached using the above mixed-culture bioleaching (MCB) process, thus solving the problem of low metal leaching efficiency from SLBs. Analysis of the underlying mechanism revealed that the effective extraction of metals from SLBs by the Fe 2+ -MCB process relied on Fe 2+ -releasing electrons to reduce refractory Co(III) to Co(II) that can be easily bioleached. Finally, the hazardous SLBs was transformed into a non-toxic material after treatment utilizing the Fe 2+ -MCB process. However, effective SLBs leaching was not achieved by the addition of Fe 0 to the MCB system. Only 25% Co and 31% Li yields were obtained, as the addition of Fe 0 caused acid consumption and bacterial apoptosis. Overall, this study revealed that reductants that cause acid consumption and harm bacteria should be ruled out for use in reductant-assisted bioleaching processes for extracting metals from SLBs.
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