CHEMICAL GEOLOGY
·
2024
·
IF 3.6
Xinting Lü,Detao He,Yongsheng Liu,Ming Li,Jie Lin,Wei Chen,Lüyun Zhu,Ao Yang,Yantong Feng,Zhenyi Liu,Xianli Zeng,Zhaochu Hu
Iron oxide minerals, such as hematite and magnetite, are commonly found in a wide range of geological environments. Their Fe isotopic composition acts as a potent geochemical tracer, finding applications across various realms of Earth sciences. However, natural iron oxide minerals often have a high Cr content up to percentile levels, necessitating correction of isobaric interference caused by 54 Cr + on 54 Fe + to ensure accurate and precise in situ Fe isotopic compositions. In this study, a pure chromium metal with homogeneous isotopic compositions was examined within the analysis sequence to obtain the fractionation factor of Cr (β Cr ) for isobaric interference correction. A femtosecond laser ablation system combined with wet plasma conditions was used to decrease the matrix effect. We synthesized a series of magnetite and hematite samples with simple matrix as well as natural magnetite samples with complex matrix to evaluate the feasibility of Cr interference correction. By employing our proposed correction method, the deviation caused by the isobaric interference of 54 Cr + was effectively eliminated. The corrected δ 56 Fe values for hematite and magnetite samples, even with a Cr/Fe ratio of as high as 1.27, exhibited good agreement with the reference values within the long-term reproducibility uncertainty of 0.10‰. These results indicate the robustness of Cr interference correction in obtaining accurate Fe isotopic compositions of Cr-rich iron oxides.
研究领域:
地球化学
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Guangda Yu,Fenglian Fu,Chujia Ye,Bing Tang
The mobility of Cr(VI) in the environment is affected by the transformation of ferrihydrite (Fh) and ferrihydrite-humic acid co-precipitates (Fh-HA). However, the impacts of Fe(II)-induced transformation of Fh and Fh-HA on the mobility, speciation and partitioning of associated Cr(VI) remain unclear. In this study, the behaviors of adsorbed Cr(VI) during Fh and Fh-HA aging at 70 °C for 9 days (pH 0 = 3.0 and 7.0) in the absence and presence of Fe(II) were studied. Results revealed that the main speciation of Cr(VI) after transformation was non-desorbable Cr and its formation involved the following pathways. Firstly, Fe(II) (0.2 and 2.0 mM) induced the transformation of Fh-HA to hematite and goethite, promoting the structural incorporation of adsorbed Cr into hematite and goethite via complexation. Secondly, under neutral condition (pH 0 = 7.0), the low concentration of Fe(II) (0.2 mM) could not reduce completely Cr(VI) to Cr(III) and thus residual Cr(VI) was incorporated into the Cr(III)-Fe(III) co-precipitates. Thirdly, coprecipitated humic acid not only reduced Cr(VI) to Cr(III) via polysaccharide, but also formed complexes with incorporated Cr through carboxylic groups to sequester Cr. Our results demonstrate that Fe(II)-induced transformation of Fh-HA exerts major influences on associated Cr(VI) speciation and partitioning.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yang Zong,Hua Zhang,Yufei Shao,Wenjie Ji,Yunqiao Zeng,Longqian Xu,Deli Wu
Periodate (PI)-based advanced oxidation processes have recently received increasing attentions. Herein, PI was readily activated by nano zero-valent iron (nZVI) and subsequently led to the enhanced oxidation of organic contaminants , with the removal performance of sulfadiazine (SDZ) in the nZVI/PI process even higher than that in the nZVI/peroxydisulfate process under identical conditions. Kinetic experiments indicated that the decay of SDZ was susceptible to the dosage of nZVI and PI, but was barely affected by pH values (4.0–7.0) under buffered conditions, suggesting the promising performance of the nZVI/PI process in a relatively wide pH range. Selective degradation of contaminants and 18 O-isotope labeling assays collectively demonstrated that iodate radical ( • IO 3 ), high-valent iron-oxo species (Fe(IV)) and hydroxyl radical ( • OH) were responsible for the abatement of organic contaminants . More importantly, due to the relatively weak steric hindrance effect of PI, PI easily adsorbed on the surface of nZVI and no iron leaching was detected throughout the reaction, implying that PI activation induced by nZVI was a surface-mediated process. Besides, PI was not transformed into harmful reactive iodine species. This study proposed an environmental-friendly approach for PI activation and shed new lights on the PI-based processes.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhao Wang,Wenyue Zhao,Ze Li,Yazhou Peng,Chang Gao,Lei Shi,Wenjing Hua,Weidong Fei,Yu Zhao
The search for multiferroic materials with ferroelectric and ferromagnetic properties at room temperature continues to be driven by the prospect of new devices. In this paper, Ba 2+ -Ti 4+ co-doped Y 1- x (Ba 0.5 Ti 0.5 ) x FeO 3 were prepared by a traditional solid-state reaction method. The ferroelectricity and ferromagnetism of the co-doped ceramics have been enhanced simultaneously with the maximum polarization of 0.48 μC/cm 2 and the maximum magnetization of 3.25 emu/g, the switched charge density (0.26 μC/cm 2 ) measured by PUND tests indicating the intrinsic and switchable remanent polarization. The increase of Fe 2+ content (increased to 28 % with the increase of doping content) caused by Ba 2+ -Ti 4+ co-doping destroys the antiferromagnetic ground state, and the doping strategy enlarges the tilt angle of oxygen octahedron from 144.93° to 148.63°. The magnetic domain switches caused by the external electric field were directly observed by magnetic force microscopy, indicating the modulation of magnetic domain by polarization at room temperature. This work may provide useful information for the structural design and performance improvement of multiferroic materials.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Linxing Zhang,Jun Chen,Longlong Fan,Zhao Pan,Jiaou Wang,Kurash Ibrahim,Jianjun Tian,Xianran Xing
To settle the growing energy crisis, photovoltaic , as the renewable solar energy, based on ferroelectric oxides has recently attracted significant attention for the breakthrough in photovoltaic application. Herein, we deposited the ferroelectric Bi 0.925 Sm 0.075 Fe 0.95 Co 0.05 O 3 (BSFC) thin films on FTO glass substrates along with uniform microstructure and multi-orientation polycrystalline. The BSFC thin films possess good ferroelectric properties with a standard hysteresis loop attributed to Co-substitution. Intriguingly, an enhancement of both photocurrent (90.4%) and photovoltage (40.0%) in BSFC thin films has been observed, indicating that the ferroelectric polarization plays an important role in the bulk effect of ferroelectric photovoltaic. Furthermore, the Co-substitution induced an increasing trend in saturation magnetization of 6.2 emu/cm 3 in BSFC thin films. The enhancement of the multiferroics and photovoltaic properties facilitates its applications of energy conversion and information storage.
研究领域:
材料科学
·
能源科学
·
物理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Kaixin Guo,Rongfen Zhang,Zhao Fu,Liangyu Zhang,Xu Wang,Chaoyong Deng
The ability to mutually regulate polarization and magnetization, highly desirable for future multifunctional devices, remains elusive despite extensive investigations. In this work, a concept of mutual regulation of ferroelectric and ferromagnetic orders via stress analysis of dipoles was proposed and the idea was demonstrated in a 2-2 type multiferroic Bi 6 Fe 1·6 Co 0·2 Ni 0·2 Ti 3 O 18 /Bi 2 FeCrO 6 heterostructure fabricated by a sol-gel technique followed with a rapid thermal proces. Both ferroelectricity , ferromagnetism and magnetoelectric coupling of the composite thin film were studied by macro- and microscale measurements. It demonstrated that a reversible change in domain structure does occur while exerting a stress on dipoles by different applied fields, wherein the (inverse)-piezoelectric effect, magnetostriction , Lorentz force, and Hall effect play an important role in deflection of dipoles and evolution of domains, and thus the regulation of polarization and magnetization, making it attractive for novel memories.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 3
·587-595
·
IF 1.986
Chakrabarti Chiranjib,Fu Qingshan,Chen Xinghan,Li Canglong,Meng Biao,Qiu Yang,Yuan Songliu
A series of Er-substituted 0.7Bi 1− x Er x FeO 3 -0.3Bi 0.5 Na 0.5 TiO 3 solid solution samples are prepared by the sol–gel auto-combustion method. The objective of this study is to investigate the effect of Er-substitution on the structural, magnetic, ferroelectric, and leakage properties in the samples. Structural analysis reveals that formation of the samples changes from rhombohedral phase to tetragonal one with increasing x , showing a simultaneous appearance of the two phases near x ~ 0.025. The room temperature ferromagnetism can be significantly improved by the substitution of Bi with Er simultaneously. The x ~ 0.05 sample shows the most significant improvements in ferroelectric response with a modest ferroelectric polarization, highest activation energy, and the lowest leakage current. These results demonstrate that the substitution of Bi with a small amount of Er is beneficial for the simultaneous improvements of ferromagnetic, ferroelectric, and leakage properties in 0.7Bi 1− x Er x FeO 3 -0.3Bi 0.5 Na 0.5 TiO 3 solid solution.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 22
·期 3
·587-592
·
IF 3.382
Chunli Jiang,Qianqian Luo,Hanmei Fu,Hechun Lin,Chunhua Luo,Jianlu Wang,Xiangjian Meng,Hui Peng,Chun-Gang Duan,Junhao Chu
Great attention has been paid to organic–inorganic hybrids in searching for single-phase multiferroics because of their flexible structure design. Here, a new [CuCl4]2− based organic–inorganic hybrid, (bix)CuCl4·H2O (bix = 1,4-bis(imidazol-1-ylmethyl)benzene), is synthesized via a simple solution method. Different from most [CuCl4]2− based organic–inorganic hybrids, tetrahedral [CuCl4]2− units in (bix)CuCl4·H2O are connected to each other through water molecules and form one dimensional chains. The coexistence of ferroelectric and antiferromagnetic ordering in (bix)CuCl4·H2O is demonstrated. Its spontaneous polarization and coercive field at room temperature are 2.03 μC cm−2 and 0.32 kV cm−1, respectively. Furthermore, (bix)CuCl4·H2O films with high quality can be easily prepared, which makes them suitable for application in device fabrication.
研究领域:
材料科学
·
凝聚态物理
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 14
·11318-11331
·
IF 2.779
Li Yueying,Ma Yan,Wang Zhoufu,Liu Hao,Wang Xitang,Dong Yunjie,Qian Weilun
Yttrium ferrite (YFeO 3 ) is highly attractive as a promising multiferroic material and also has been proven to have potential in the field of near-infrared reflective cold pigments. In this work, YFeO 3 powders were fabricated via metal citrate xerogel mediated molten salt procedure at different temperatures. The complexation process of the metal citrate xerogel as a precursor was promoted by the salt medium, and the molten salt medium reduces the reaction temperature to obtain morphologically distinctive YFeO 3 without impurity. The orange YFeO 3 powders possessed outstanding near-infrared reflection characteristics and high solar reflectance. The relationship of particle size, particle shape, charge state distribution, magnetic performance and near-infrared reflection performance of YFeO 3 was investigated. Specifically, with the increase of calcining temperature, particle size increases, thereby increasing the infrared reflectivity. The rising in the amount of Fe 2+ –Fe 3+ ion pairs increased the absorption of free carriers, thereby reducing the infrared reflectivity. The two factors contributed together to the near-infrared reflectivity, which first increased and then decreased with the increase of calcining temperature. In addition, the increase in the ratio of Fe 2+ also hindered the super-exchange and Dzyaloshinskii–Moriya interaction of Fe–O–Fe, thereby improving of the weak-ferromagnetic behavior of YFeO 3 .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Meng Zhu,Yuan Li,Xiaobao Wei,Zhenqi Yan,Lu Yang,Ruyi Yang
Iron reduction impacts the mobilization and thionation of diphenylarsinic acid (DPAA) in soil, but the contribution of crystalline and non-crystalline iron remains unknown. A paddy soil deficient in non-crystalline iron (P-Fe o ), crystalline and non-crystalline iron (P-Fe d ) were incubated with sulfate-plus-lactate, and the results were compared with paddy soil (P) in our previous study. For treatments without ferrous sulfide (FeS) precipitation, the solution-to-solid ratio ( R L/S ) of DPAA increased slightly and dramatically with iron reduction, respectively, for P-Fe o and P, suggesting that the reduction of non-crystalline iron contributes more to DPAA mobilization than crystalline iron. The R L/S was > 0.667 and ≤ 0.667 for treatments without and with FeS, respectively, in P and P-Fe o but not P-Fe d , indicating that crystalline, rather than non-crystalline iron contributes more to DPAA sequestration through reduction and the subsequent FeS precipitation. The degree to which iron reduction facilitates DPAA mobilization or sequestration is likely determined by the composition and amount of iron in paddy soil, respectively. For treatments with FeS, the DPAA transformation rate was < 44 % and 74–86 %, respectively, in P-Fe o and P-Fe d after 90 days, with the maximum value comparable to those without FeS in P after 30 days. This suggests that the crystalline iron in P-Fe o and the residual, small amount of non-crystalline iron in P-Fe d could reduce DPAA thionation by forming FeS, and such effect seems to depend on both the composition and the amount of iron in paddy soil. The results would deepen our understanding of the “As-Fe-S” interactions in soil.
研究领域:
土壤科学
·
环境化学
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 35
·20713-20723
·
IF 3.119
Yunpeng Liu,Hao Wang,Lixiong Qian,Xiaoyi Zhao,Lei Yao,Jiayi Wang,Xueqing Xing,Guang Mo,Zhongjun Chen,Zhonghua Wu
Bismuth ferrite (BiFeO3) is a promising Bi-based perovskite-type material, which is multiferroic due to the coexistence of anti-ferromagnetism and ferroelectricity. During the preparation of pure BiFeO3 nanoparticles, however, the phase structures and species of bismuth–iron-based precursor (BFOH) were still unclear, and so related precursors were prepared. X-ray diffraction, Raman, Fourier transform infrared, and X-ray absorption near-edge structure techniques were used to probe the phase structure and species of the precursors. It was found that the precursor BFOH is composed of Bi6O6(NO3)4(OH)2·2H2O, Bi6O5(NO3)5(OH)3·3H2O, Fe(OH)3, and α-Bi2O3. Calcination treatment and hydrothermal synthesis were used to prepare the pure BiFeO3 phase from the precursor BFOH. The calcination temperature was optimized as 400 °C for preparation of the pure BiFeO3 phase. Meanwhile, hydrothermal conditions for the synthesis of the pure BiFeO3 phase were also optimized as follows: the reaction solution was the mixture solution of Bi(NO3)3·5H2O and Fe(NO3)3·9H2O with cetyltrimethyl ammonium bromide (CTAB) as the surfactant and KOH as the mineralizer; the hydrothermal synthesis was performed at 180 °C for 48 h; the concentration of KOH should be at least 3 M; and the surfactant CTAB can be used to regulate the morphology of the as-prepared BiFeO3 nanoparticles. From the point of view of the microstructure, BiFeO3 nanoparticles prepared by calcination or hydrothermal methods have no notable differences. A formation mechanism from the precursor BFOH to the BiFeO3 product is proposed. By providing an understanding of the precursors, this work is very helpful in the synthesis of bismuth–iron-based nanoparticles.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Shuchang Wang,Yang Deng,Binbin Shao,Jiahui Zhu,Zixin Hu,Xiaohong Guan
For the first time, this study showed that the apparent second-order rate constants (kapp) of six selected emerging organic contaminants (EOCs) oxidation by Fe(VI) increased, remained constant, or declined with time, depending on [EOC]0/[Fe(VI)]0, pH, and EOCs species. Employing excess caffeine as the quenching reagent for Fe(V) and Fe(IV), it was found that Fe(V)/Fe(IV) contributed to 20–30% of phenol and bisphenol F degradation by Fe(VI), and the contributions of Fe(V)/Fe(IV) remained nearly constant with time under all the tested conditions. However, the contributions of Fe(V)/Fe(IV) accounted for over 50% during the oxidation of sulfamethoxazole, bisphenol S, and iohexol by Fe(VI), and the variation trends of kapp of their degradation by Fe(VI) with time displayed three different patterns, which coincided with those of the contributions of Fe(V)/Fe(IV) to their decomposition with time. Results of the quenching experiments were validated by simulating the oxidation kinetic data of methyl phenyl sulfoxide by Fe(VI), which revealed that the variation trends of kapp with time were significantly determined by the change in the molar ratio of Fe(V) to Fe(VI) with time, highlighting the key role of Fe(V) in the oxidative process. This study provides comprehensive and insightful information on the roles of Fe(V)/Fe(IV) during EOC oxidation by Fe(VI).
研究领域:
环境科学
·
化学动力学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）