SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yi Yuan,Lijia Huang,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Hydrogen sulfide (H 2 S) is a major air pollutant posing a serious threat to the environment and public health. It is highly attractive to develop state-of-the-art adsorbent to remove H 2 S. Herein, a novel ZnFe 2 O 4 -loaded porous biochar (RZF) with a high surface area of 1065 m 2 /g was synthesized via one-step carbonation activation of kitchen leftover rice with ZnCl 2 and FeCl 3 as activators. The optimized RZF-500-1:1 was obtained by rationally adjusting the activation ratio (the mass ratio of leftover rice and ZnFe 2 O 4 ) and pyrolysis temperature. Such RZF-500-1:1 delivered high-performance H 2 S removal with the breakthrough capacity up to 228.29 mg/g at 25 °C, whilst the inactivated biochar (carbonization without activator) only showed a much lower adsorption capacity at circa 12.11 mg/g of H 2 S. The desulfurization conditions had a significant effect on the H 2 S breakthrough capacity, and the adsorbent exhibited better desulfurization performance at room temperature and in the presence of oxygen. The desulfurization mechanism on the ZnFe 2 O 4 -loaded biochar was proposed to be an adsorption-catalytic oxidation coupled process. Moreover, the as-fabricated sample showed high regeneration ability, retaining 91.6% of the initial breakthrough capacity after five regeneration cycles. This novel one-step preparation method would permit a gain of time and energy to obtain efficient activated carbons intended to capture H 2 S.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhao Li,Guixiang Liu,Yong Ren,Fang Xu,Bo Dai,Yong Zhao,Xingwu Yuan,Jiongming Li,Dengjian Ye
In this study, the effects of different parameters (sintering temperature and holding time) of spark plasma sintering (SPS) on the microstructure and magnetic properties of LiNiZn ferrite ceramics were systematically investigated, and the samples sintered by SPS (SPS samples) were compared with the samples sintered by traditional sintering (TS samples). X-ray diffraction analysis confirmed that all the samples were ferrites with spinel structure. The microstructure of the samples was analyzed by scanning electron microscopy. Compared with TS samples, SPS samples exhibited finer and more uniform grains and denser structure. At the sintering temperature of 1000 °C, SPS samples exhibited higher saturation magnetization ( M s , 79.7 emu⋅g −1 ) and lower ferromagnetic resonance linewidth ( ΔH , 231 Oe) than TS samples ( M s : 69.3 emu⋅g −1 , ΔH : 298 Oe). The phase structure and cation distribution of the samples were analyzed by Raman spectroscopy . Herein, it was speculated that the instantaneous high temperature generated by spark plasma redistributed the cations in the crystal, and the distribution mode was stabilized by rapid cooling. Based on the change of magnetic moment of ferrite molecules caused by cation distribution, a method of judging the specific M s by fitting analysis of Lorentz curve of A 1g Raman signal of ferrite ceramics was proposed. The SPS samples showed more compact and uniform microstructure and more reasonable cation distribution than TS samples, and these characteristics were mainly responsible for the remarkable improvement of magnetic properties. The results indicate that SPS method can effectively alleviate the contradiction between M s and ΔH , and provide an alternative pathway to prepare high-performance soft magnetic ferrite.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Songhan Hu,Mingyuan Ma,Wei Sun,Guowei Pan,Kai Wang,Qiang Wang
The impacts of nanoplastics on the environment and organisms are gradually increasing, using MRI to detect the metabolic pathways of nanoplastics has low sensitivity and requires magnetic particles for enhanced visualization. In this study, we used Mn 0.6 Zn 0.4 Fe 2 O 4 nanoparticles as magnetic particles and coated them with polystyrene to afford polystyrene composite microspheres (ZMF@PS) with enhanced contrast performance. The effects of the polymerization parameters on the morphology and loading rate of the magnetic ZMF@PS composite microspheres were investigated. In addition, the effect of the magnetic contrast agent (ZMF particles) on the magnetic properties of the ZMF@PS composite microspheres was examined. The results show that when MAA and KPS quantities are 1 mL and 0.02 g, respectively, ZMF was uniformly distributed in the ZMF@PS composite microspheres exhibiting a good coating effect, with an average microsphere size of only 151.09 nm. Regarding the contrast performance, an increase in the ZMF content increased the loading rate, saturation magnetization intensity, and relaxation rate of the ZMF@PS composite microspheres.
研究领域:
材料科学
·
医学影像
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Tengyan Wu,Guokang Shen,Feng Ding,Duxin Li,Hongbin Zhong
In this study, the La doped Mn–Zn nanoferrites were synthesized through hydrothermal method , and then were used to activate persulfate for degrading azo dye the Direct Blue 15 (DB15). The structure and morphology of the as-prepared sample were characterized by X-ray Diffraction (XRD), Fourier Transformed Infrared Spectrometer (FTIR), Transmission Electron Microscopy (TEM) and Energy Dispersive Spectrometer (EDS). The results indicated that the La doped Mn–Zn ferrite was successfully synthesized in this study. Four absorption bands were observed in FTIR spectra and assigned to the corresponding site bonds. Mn 0.6 Zn 0.4 La x Fe 2- x O 4 was chosen as catalysts to activate persulfate (PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 ) to decolorize the DB15. It was found that the DB15 was degraded effectively by PS/Mn 0.6 Zn 0.4 La x Fe 2- x O 4 systems. Furthermore, the influences of synthesized conditions (such as the temperature, holding time and doping content of La) of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 on the DB15 decolorization were analyzed. The results indicated that the doping of La can significantly improve the DB15 degradation, 100% degradation of DB15 can be obtained by PS/Mn 0.6 Zn 0.4 La 0.09 Fe 1.91 O 4 within 15 min. The enhancement of synthesized holding time of Mn 0.6 Zn 0.4 La x Fe 2- x O 4 at 160 °C can also increase the DB15 decolorization, and the degradation rate of the DB15 reached almost 100% within 25 min when using Mn 0.6 Zn 0.4 La 0.05 Fe 1.95 O 4 synthesized at 160 °C for 13 h as catalyst.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Yan Yang,Huaiwu Zhang,Jie Li,Yiheng Rao,Gang Wang,Gongwen Gan
Miniaturization, high frequency capability, low loss, and matching impedance play critical roles in new generation antennas. Although ferrite ceramics show a great potential as antenna substrate materials, some challenges still remain associated with their application to high performance antennas. In this work, we synthesized Bi 3+ -substituted NiCuZn ferrite to adjust the microstructure, magnetic, and dielectric properties at low sintering temperatures . It is shown that Bi 3+ substitution not only enhances grain growth and compactness of NiCuZn ferrite at low sintering temperatures, but also effectively tailors the permeability, permittivity, and loss factor. In particular, NiCuZn ferrite doped with 0.025 wt%, of Bi 2 O 3 possesses excellent performance with high permeability (~29.1), high n factor (~22.76), appropriate matching impedance (Z factor = 1.28), and low loss tangents (tanδ μ = 0.00853, tanδ ε = 1.22683 × 10 -4 ). In addition, the dielectric loss is significantly reduced and becomes as low as magnetic loss at high frequencies; the typical tanδ ε reduces to 1.94 × 10 -6 , and tanδ ε / ε ´ is greatly decreases to 0.137 × 10 -6 at 50 MHz. Thus, Bi 3+ -adjusted NiCuZn ferrites open up new opportunities for applications in high-frequency LTCC antennas.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2015
·
IF 3.091
Fengzhen Zhang,Chaohai Wei,Yun Hu,Haizhen Wu
The studies in ozonation catalysis present a trend in development of advanced oxidation processes (AOPs) applied to the wastewater treatment. The zinc ferrite (ZnFe 2 O 4 , ZFO) catalysts were synthesized hydrothermally (ZFO-H) and using the citrate sol–gel (ZFO-C) method with their characterization by XRD, Raman spectrum, SEM, XPS and FT-IR techniques. The objectives of this study include examining the performance of the catalysts in oxidation of phenol and pollutants in biologically treated coking wastewater (BTCW), compared to non-catalytic ozonation, and evaluating the ozonation reaction kinetics. The changes in the composition of BTCW on course of treatment were determined by ultraviolet–visible (UV) absorption and three-dimensional excitation–emission matrix spectroscopy (3DEEMs) analyses. The experimental results showed the ZFO-H catalyst accelerating the degradation of phenol for about 1.5 times as compared to non-catalytic ozonation. The catalytic activity of ZFO-H surpassed that of ZFO-C in phenol removal, attributed to the larger contact surface area and higher surface hydroxyl group density. The higher catalytic activity of ZFO-H was also confirmed by the ability of decomposing ozone and generating hydroxyl radicals ( OH). The empirical model developed in the research indicates the catalyst concentration and the ozone concentration to be the most significant factors of the reaction apparent rate; the role of pH appeared to be minor. The presence of catalysts leads also to a higher mineralization efficiency of BTCW pollutants compared to non-catalytic ozonation. The UV and 3DEEMs analysis demonstrated effective removal of the aromatic and conjugated structural compounds in BTCW by catalytic ozonation. The performance of the catalysts is determined primarily by their synthesis method defining the surface properties.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Yangrui Xu,Xiaodie Zhu,Huan Yan,Panpan Wang,Minshan Song,Changchang Ma,Ziran Chen,Jinyu Chu,Xinlin Liu,Ziyang Lu
The recyclable and stable ZnFe 2 O 4 small particle decorated one-dimensional perylene diimide (PDI) S-scheme heterojunction (1D PDI/ZnFe 2 O 4 ) is prepared by the hydrochloric acid-mediated (HCl-mediated) strategy, interestingly, the morphology of the 1D PDI/ZnFe 2 O 4 can also be effectively regulated by HCl-mediated process, the existence of HCl can regulate PDI into a uniform rod structure, while the co-existence of HCl and PDI can limit ZnFe 2 O 4 to become the uniform small particles. More importantly, based on the 1D rod structure of PDI and the small size effect of ZnFe 2 O 4 , carriers can migrate to the surface more easily, which can improve the photocatalytic activity. Meanwhile, due to the appropriate energy level structure, the S-scheme heterojunction structure is formed between PDI and ZnFe 2 O 4 , which eliminates meaningless photo-generated charge carriers through recombination and introduces strong redox to further enhance the photodegradation effect, thereby, 1D PDI/ZnFe 2 O 4 exhibits excellent photocatalytic ability, under the visible light irradiation, the degradation rate of tetracycline (TC) with 1D PDI/ZnFe 2 O 4 (66.67%) is 9.18 times that with PDI (7.26%) and 9.73 times that with ZnFe 2 O 4 (6.85%). This work proposes new ideas for the assembly of magnetic organic-inorganic S-scheme heterojunction photocatalysts.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 43
·435706
·
IF 3.551
Wei Wei,Huihui Hu,Linlin Chen,Zaoxue Yan,Xuelin Fan,Junjie Wang,Yuanguo Xu,Jimin Xie
In this study, a nonaqueous method for the synthesis of size-controlled highly crystalline zinc ferrite/reduced graphene oxide (ZFO/rGO) aerogel was provided by using benzyl alcohol as the medium. In our findings, benzyl alcohol was introduced not only as the solvent, but the structure-directing agent and strong reducing agent during the nucleation and growth of ZnFe2O4 nanoparticles (NPs). The characterization analysis indicated that ZnFe2O4 NPs were immobilized on the multilayer rGO with a controllable size of 12 nm. Moreover, the 3D ZFO/rGO aerogel shows excellent electrochemical property as a facile electrochemical sensor for the detection of p-nitrophenol (p-NP). The ZFO/rGO electrochemical sensing offers the advantages of wide linear range (1–500 μmol l−1), excellent sensitivity (23.985 mA mM−1 cm−2), good stability and selectivity (<8.8%). In addition, the possible reaction mechanism of 3D ZFO/rGO aerogel was explained during the detection process under acidic condition. Significantly, our results not only provided insight into the possible reaction mechanism of 3D ZFO/rGO nanocomposite, but proposed the way for the synthesis of highly crystalline materials through a benzyl alcohol-mediated method.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 12
·4290-4301
·
IF 3.348
Ping Lyu,Yongbo Hou,Rongzhen Wang,Mingliang Ma,Yan Chen,Qiyang Xing,Yong Ma,Shuang Wang,Yuefeng Wu,Weibo Huang
The flame retardant zinc ferrite@Mg-Al-sodium dodecyl benzene sulfonate layered double hydroxide (ZnFe 2 O 4 @Mg-Al-SDBS LDH) was prepared successfully by simple hydrothermal method and co-precipitation method. ZnFe 2 O 4 nanoparticle was used as the core on which Mg-Al LDH was encapsulated to form a spherical structure with a lamellar intercalation layer. The microstructure, the phase structure, and the thermal properties of flame retardant were characterized in detail. Compared with pure polyurea (PUA), the total heat release (THR), peak heat release rate (PHRR) and smoke factor (SF) of PUA/ZnFe 2 O 4 @Mg-Al-SDBS LDH 3.0 wt% decreased by 17.64%, 20.13%, and 28.42%, respectively. In the combustion process, Mg-Al LDH could generate porous metal oxides (Al 2 O 3 and MgO), and ZnFe 2 O 4 could also be decomposed into ZnO and Fe 2 O 3 . These oxides catalyzed cross-linking of polymer molecules, to promote the formation of a dense char layer, and isolated heat and combustible gases from the underlying material. The improved flame retardant properties of the modified intercalated microspheres could be attributed to catalytic carbonization and physical barrier. Moreover, the mechanical properties of PUA composites were tested by universal tensile testing machine. The results showed that the addition of ZF@MASL flame retardant had little influence on the mechanical properties of PUA composites.
研究领域:
材料科学
·
燃烧学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
·
2014
·Vol. 122
·期 1429
·768-771
·
IF 0.846
Xiaobing ZHOU,Young-Hwan HAN,Yongqiang ZHANG,Qian WANG,Jie ZHOU,Lu SHEN,Tongming HUANG,Weiming PAN,Changshu XIANG,Huiping TANG,Jaehyung LEE,So Ik BAE,Dong-Yeon LEE,Qing HUANG
Ni-Carbon nanotube (CNT)-Ni0.5Zn0.5Fe2O4 multiphase composites were sintered by spark plasma sintering (SPS) technique. Ni nanoparticles were in-situ formed due to the localized carbothermal reduction by CNTs and well distributed between grain boundaries in the composites. The electrical conductivity of the resultant multiphase composites was strongly dependent on the weight percentage of CNTs. In the SPS process, CNTs acted as “heating source” and improved the consolidation of the composites. The results indicate that the introduction of the CNTs can promote the sintering kinetics of the ferrite ceramics. However, the grain growth kinetics has been inhibited by SPS and the grain size becomes finer.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Fang Xu,Yulong Liao,Dainan Zhang,Tingchuan Zhou,Jie Li,Gongwen Gan,Huaiwu Zhang
LiZn ferrite ceramics with high saturation magnetization (4πMs) and low ferromagnetic resonance line widths (ΔH) represent a very critical class of material for microwave ferrite devices. Many existing approaches emphasize promotion of the grain growth (average size is 10–50 μm) of ferrite ceramics to improve the gyromagnetic properties at relatively low sintering temperatures. This paper describes a new strategy for obtaining uniform and compact LiZn ferrite ceramics (average grains size is ∼2 μm) with enhanced magnetic performance by suppressing grain growth in great detail. The LiZn ferrites with a formula of Li0.415Zn0.27Mn0.06Ti0.1Fe2.155O4 were prepared by solid reaction routes with two new sintering strategies. Interestingly, results show that uniform, compact, and pure spinel ferrite ceramics were synthesized at a low temperature (∼850 °C) without obvious grain growth. We also find that a fast second sintering treatment (FSST) can further improve their gyromagnetic properties, such as higher 4πMs and lower ΔH. The two new strategies are facile and efficient for densification of LiZn ferrite ceramics via suppressing grain growth at low temperatures. The sintering strategy reported in this study also provides a referential experience for other ceramics, such as soft magnetism ferrite ceramics or dielectric ceramics.
研究领域:
材料科学
·
磁性材料
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yan Yang,Jie Li,Jianxiong Zhao,Xia Chen,Gongwen Gan,Gang Wang,Linfeng He
Saturation magnetization and ferromagnetic resonance linewidth are important parameters for microwave devices, such as circulator/isolator. Conventional sintering of ferrite ceramics is prevalently performed to promote the densification. Here, we present a new sintering approach for obtaining uniform and dense NiCuZn ferrite ceramics with enhanced gyromagnetic properties at low temperatures. The NiZn-series ferrites (Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 3 – 1.0 wt% Bi 2 O 3 +0.5 wt% MnO 2 ) was synthesized by solid reaction routes with new sintering approaches. The results indicate that a one-transient-step sintering process (OTSP) can significantly improve the gyromagnetic properties at low sintering temperatures by suppressing the anomalous grain growth, such as higher saturation magnetization (4π M s = ∼3904 Gauss) and lower ferromagnetic resonance linewidth ( ΔH = ∼170 Oe). Therefore, such a methodology is quite significant due to it provides a referential experience for effective sintering route that can enable broad practical applications, such as other ferrite ceramics.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）