INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Baoping Zhang,Heng Zhang,Yin Wang,Shiyuan Fang
Amine/quaternary ammonium lignin for adsorption of tungsten was synthesized by amination and quaternization from lignin. The adsorbent was characterized by SEM-EDS and FTIR. The effects of pH, initial concentration of tungsten, adsorption time and dosage of adsorbent on the adsorption effect were investigated. The adsorption mechanism was revealed by SEM-EDS and FTIR and XPS. The results showed that amine/quaternary ammonium lignin was loose and rough and contained a large number of phenolic hydroxyl and amine and quaternary ammonium functional groups. Using the optimum conditions, which included the pH of 4.0 and initial tungsten concentration of 800 mg·L −1 and adsorption time of 960 min, the saturated adsorption capacity of 1 g·L −1 amine/quaternary ammonium lignin for tungsten reached 421.68 mg·g −1 . The adsorption followed Langmuir model and quasi-second-order kinetic model, indicating that the adsorption was monolayer homogeneous chemisorption. When the total concentration of tungsten was 0.005 mol·L −1 and the value of pH was smaller than 4.7, H 2 W 12 O 40 6− was the existing form of tungsten and was adsorbed by electrostatic attraction of hydrogen bond and coordination with amino and ion exchange with Cl − .
研究领域:
环境科学
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化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 29
·e52649
·
IF 3.057
Chen Gao,Junbo Jiang,Juan Wang,Yutong Wang,Yangyang Zhang,Caihua Rao,Yue Cheng,Zhongrong Chen,Runhuai Yang,Gang Zhao
Mineralization of hydroxyapatite mineralized by acidic metal oxides has attracted substantial research interest in the research and development of orthopedic substitutes. In this study, Polycaprolactone (PCL) nanofibers with nano-tantalum oxide (Ta 2 O 5 ) were successfully fabricated through electrospinning. The scaffold simulates the mineralization process of hydroxyapatite in simulated body fluid. However, in the process of mineralization, there is a chemical reaction between hydrophobic scaffolds and acid oxides, which is believed to have a significant impact on the biological effects of the scaffolds. The results of SEM, EDS, XRD, Mapping, FTIR, GPC, 13 CNMR, and 1 HNMR explain the principle of hydroxyapatite mineralization by Ta 2 O 5 and the reason why the composite scaffold is blurred, that is, the carbonyl carbon of PCL attacked by the surface hydroxyl groups of Ta 2 O 5 to catalyze its ring-opening polymerization to synthesize PCL/Ta 2 O 5 nanocomposites in one step. In order to accurately explore the effect of this reaction on the metabolism of biological macromolecules in the future, we provide a detailed route of Ag Nanoparticles -Dimercaptosuccinic acid@Transcription activator (AgNPs-DMSA@TAT) probe synthesis. The results provide a reference for the sedimentation of hydroxyapatite induced by acid oxides and its effect on traditional electrospun fiber scaffolds.
研究领域:
材料科学
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生物材料
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骨科
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生物医学工程
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Bo Li,Hansheng Leng,Wei Liu
A new low-temperature sintered microwave ceramic Ca 5 Ni 2 Mg 2 V 6 O 24 (CNMVO) was synthesized by a solid-state reaction method. The effect of sintering process on microstructures and microwave properties of CNMVO ceramics was investigated in detail. XRD results and EDS analyses show that CNMVO ceramics sintered at 850–925 °C are the uniform solid solution with a stable cubic garnet structure. The CNMVO ceramic sintered at 875 °C has the highest Q × f value and is accompanied by the volatilization of vanadium observed by SEM . TG curves demonstrate that the increase of heating rate weakens the vanadium loss. According to the Raman spectra , the Q × f value reaches the maximum value at a heating rate of 2 °C/min, because of the highest cation ordering degree and the densest packing fraction caused by the properly deficient vanadium. As a result, the Ca 5 Ni 2 Mg 2 V 6 O 24 ceramic sintered at 875 °C with a heating rate of 2 °C/min exhibits the best microwave properties: ε r = 8.07, Q × f = 60,613 GHz, and τ f = −32 ppm/°C.
研究领域:
材料科学
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陶瓷
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微波工程
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Biao Wu,Meng Yan,Fen Luo,Xiaoyan Shu,Yi Liu,Guilin Wei,Zhentao Zhang,Yi Xie,Xirui Lu
Spent nuclear fuel contains 129 I, which has deleterious effects on human health. This study focused on the immobilization of iodine waste forms via a novel preparation method with B 2 O 3 –Bi 2 O 3 –ZnO–SiO 2 glass at 500–600 °C. The XRD results manifest that the sample with 30 wt % iodine sintered at 550 °C exhibits an obvious amorphous phase. The density of the samples with different iodine contents increases with the temperature increasing, so does the amorphous fraction except for 25 wt %. The FT-IR results reveal the matrix is mainly composed of [BO 3 ], [BO 4 ], [SiO 4 ], and [BiO 6 ]. TGA analysis shows high water content in the prepared samples. SEM-EDS results present that at 550 °C one part of the iodine is chemically immobilized into the glass matrix, and meanwhile, the other physically packed by the vitrified bulk. Our findings demonstrate the potential of the new preparation method for the disposal of iodine waste forms.
研究领域:
核废料管理
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材料科学
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环境工程
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Da Li,Jian Liu,Hulin Gao,Jiamei Hao,Yunlong Yu
The unavoidable presence of ionic substances in the ore pulp can adversely effects on the separation of pyrite from other valuable metal sulfide ores. Developing new reagents to eliminate this effect is of great significance. In this study, a novel approach was proposed to depress pyrite by utilizing sodium trithiocarbonate (Na 2 CS 3 ) as a depressant in the lime-CuSO 4 system. The results of the micro-flotation experiments showed that a low dosage of Na 2 CS 3 in the lime-CuSO 4 system could effectively depress pyrite. The presence of CuSO 4 in the solution which improves the ability of BX to adsorb on the surface of the pyrite was also revealed by the analysis of LEIS, UV–Vis, and contact angle, while the addition of Na 2 CS 3 effectively hindered the adsorption of BX. XPS and SEM-EDS analysis results showed that Na 2 CS 3 forms a complex with Cu 2+ and adsorbs onto the pyrite surface, thereby impeding the adsorption of the collector and effectively depressing pyrite.
研究领域:
矿物加工
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化学工程
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Gaopeng Zhou,Ying Li,Yadan Luo,Xi Wang,Yushi Ding
In this article, the structure and electrical properties of BaSn 0.15 Ce 0.35 Hf 0.25 Y 0.1 Yb 0.1 Ho 0.05 O 3-δ (referred as BSCHYYbHo in forthcoming discuss) high-entropy ceramic have been investigated. The BCHYYb (short for BaCe 0.5 Hf 0.3 Y 0.1 Yb 0.1 O 3-δ ) and BSCHYYbHo pellets were synthesized successfully by the solid-state reaction method. The XRD detection results indicate that there is no secondary phase appeared in BSCHYYbHo and the lattice constant decrease compared to BCHYYb. The surface SEM and EDS images illustrates that BSCHYYbHo is denser than BCHYYb and the elements distribution is more uniform. The DFT calculation proves that BSCHYYbHo has a tend to maintain single phase structure. The electrical properties of BSCHYYbHo is obtained by the DRT analysis and equivalent circuit method based on defect equilibria model. The total conductivity of BSCHYYbHo is about 2.02 × 10 -4 ∼1.01 × 10 -2 S·cm -1 and standard molar hydration enthalpy of BSCHYYbHo is recorded as − 81.8 kJ/mol. Further, the proton, oxygen vacancies and electron holes conductivity activation energies in BSCHYYbHo is estimated to be 0.45 eV, 1.41 eV and 1.60 eV, respectively. Compared to BCHYYb, BSCHYYbHo electrolyte has higher proton concentration and proton transference number. Overall, BSCHYYbHo ceramic with dense structure and high proton transference number is a potential material for application.
研究领域:
材料科学
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电化学
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陶瓷
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固体化学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Junjun Wang,Peng Lin,Weiyang Yu,Peng Xu,Bowen Zhang,Guohua Cao
Pt-loaded curling-like Bi 2 WO 6 (BWO) microdiscs were fabricated via a simple one-step hydrothermal and impregnation route. Various characterization methods, such as XRD, EDS and TEM, were conducted to prove the successful Pt loading. Electron migration from the semiconductor BWO to the precious metal Pt was revealed by the blue shift of the Bi 4f and W 4f XPS peaks with the increase of the Pt loading amount and the ∼10-fold baseline resistance elevation of the BWO-based sensor by the Pt loading, proving the formation of Schottky junction. Among the pristine BWO and Pt-loaded BWO with different Pt loading amounts, 1 wt % Pt-loaded BWO exhibits the highest gas response of 209 in sensing 500 ppm triethylamine at 300 °C, a minimal selectivity coefficient of 130.6 against some typical interfering gases at the same concentration and a low detection threshold of 1 ppm. Additionally, the sensitization mechanism is discussed as the synergistic effect of noble metal catalytic effect and metal-semiconductor junctions.
研究领域:
材料科学
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化学传感器
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2025
·
IF 2
Su Zifei,Shi Chunjing,Meng Fanning,Yang Ying,Yang Jinyao,Wang Zhihui,Wang Menghang,Cao Chun
Cleaning of silicon (Si) wafers has become the key process in integrated circuit (IC) manufacturing, improving the quality and usability of Si wafers. However, traditional cleaning slurries usually contain strong and corrosive acids and alkalis, resulting in the potential damages to the environment and operators, as well as corrosion to Si wafers and production of wastes. To solve this challenge, a novel green slurry was developed, including Sodium carbonate and Citric acid. Under the action of the developed slurry, Si wafers were treated via synergetic effect between interval ultrasonication and paddle stirring. Orthogonal tests were performed through adjusting the concentration of Sodium carbonate and Citric acid, and time and temperature of cleaning. Energy-dispersive spectroscopy (EDS) analysis has revealed that the surface impurities on Si wafers reach their lowest levels (Na < 0.3%, Fe < 0.15%) under specific processing conditions. These optimal conditions include a Sodium carbonate concentration of 12 wt.% and a Citric acid concentration of 10 wt.%. Additionally, the processing temperature should be maintained at 45 °C, with a duration of 50 min. Prior to and after cleaning, surface roughness Ra of Si wafer is reduced from 9.39 ± 0.38 to 5.56 ± 0.51 nm. Combining x-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectrometer (FTIR) analysis, these impurities, such as oxyacid, organics, metallic oxides and metal ions, were removed from the Si wafers under different acidic and alkaline environments, through chelation and redox reactions. Therefore, the developed green slurry and novel approach using chemical and ultrasonic composite fields provide new insights for the cleaning and manufacturing of Si wafers.
研究领域:
半导体制造
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材料科学
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表面工程
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环境化学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1621-1629
·
IF 4.912
Yachao Du,Qingwen Tian,Jin Huang,Yuechao Zhao,Xiaohuan Chang,Afei Zhang,Sixin Wu
Additional elements in Cu2ZnSn(S,Se)4 (CZTSSe) absorber layers present a viable strategy to improve the performance of thin film solar cells. In this study, heterovalent cation doping by partially substituting metal cations with Ga3+ is explored by constructing a sandwich-like configuration. We demonstrated that a low doping level of Ga3+ can be successfully incorporated into the host lattice of CZTSSe to form a homogeneous Cu2ZnSn(Ga) (S,Se)4 (CZTGSSe) alloy material. Characterization was performed using SEM, EDS, XRD, Raman spectroscopy, and XPS, which showed that the material fabricated by this heterovalent cation doping method expressed high phase purity, appropriate valence components, and suitable optical bandgap, which are vital for high performance solar cells. As a result, the champion device achieves stabilized efficiency as high as 10.80%, improved by nearly 28% compared with only 8.43% for the reference device.
研究领域:
材料科学
·
太阳能
·
半导体物理
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产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2023
·
IF 7.1
Hong-Yan Wang,Amit Kumar,Jin Li,Peng Chen,Zhi-Guo Yu,Guo-Xin Sun
Lanthanum (La)-loaded biochar (BC) was considered as an efficient adsorbent for phosphate removal in wastewater. Arsenate has a similar chemical structure to phosphate, however, performance and mechanisms of arsenate adsorption onto La-doped biochar are less studied and remain unclear. In this study, La-modified biochar (BC) was prepared using two dinstinct methods: pyrolysis of LaNO 3 -doped rice husk (pre-pyrolysis modification, referred to as La-BC) and pyrolysis of LaNO 3 -doped rice husk biochar (post-pyrolysis modification, referred to as BC-La). Isotherm experiments showed that the maximum arsenate adsorption content onto La-BC and BC-La was similar, respectively of 21.3 mg g −1 and 16.5 mg g −1 at pH = 5. Combined results of SEM-EDS, FTIR, and XPS analyzing revealed that La oxides and hydroxides loaded on BC played a vital role in arsenate adsorption. Electrostatic attraction and ligand exchange were considered as key mechanisms for arsenate adsorption. Compared to La-BC, the results revealed that La oxides/hydroxides exhibited more crystalline structures on BC-La. Moreover, the BC-La displayed more efficient adsorption capabilities over a wider pH range (pH 4–10) than La-BC. The XPS O1s spectra analysis confirmed the formation of different inner-sphere complexes on La-BC and BC-La. Results of this study revealed mechanisms of arsenate adsorption onto La-modified biochar, and highlighted that the adsorption behavior of arsenate onto La-modified biochar could be significantly influenced by modification methods.
研究领域:
环境科学
·
材料科学
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化学工程
·
水处理
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Kui Ma,Naixin Wang,Chengcheng Wang,Quan-Fu An
In recent years, metal-organic framework (MOF) membranes have attracted much attention in many fields. However, the fabrication of MOF membrane with defect-free ultrathin separation layer on the surface of a substrate is very difficult. In this study, freezing assisted in situ growth strategy was used to prepare a nano-confined ZIF-8 composite membrane on a porous ceramic substrate . The frozen alumina substrate with the metal ion ice crystal inside the pores was immersed in ligand solution for the growth of ZIF-8 crystals. Then, ZIF-8 nanoparticles were grown inside the pores rather than on the surface of the substrate. The morphology and structure of the ZIF-8 particles and nano-confined composite membranes were characterized by XRD , SEM, FTIR , EDS, and nanoindentation . The obtained nano-confined ZIF-8 composite membrane exhibited excellent separation performance and stability for removing dyes from water. The influence of preparation conditions on membrane structure and property was also investigated. The freezing assisted method may provide an avenue for preparing MOF membranes in other fields.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 13
·D606
·
IF 3.12
Kui Liu,Jiajia Sun,Liqi Zhu,Yuxue Sang,Weiqun Shi,Zhifang Chai,Biao Wang,Mingliang Kang
The aim of this work is to explore the electrodeposition of uranium in low-melting LiCl-KCl-CsCl eutectic. A variety of conventional electrochemical techniques, including cyclic voltammetry (CV), chronopotentiometry (CP), and chronoamperometry (CA), were employed to study the electrochemical and kinetic properties of uranium at different temperatures ranging from 573 to 872 K. First, the electrochemical behaviors and diffusion coefficients of uranium species in the melts were investigated and compared to the published results. The temperature significantly affects the cathodic current response of the U4+/U3+ couple within the low temperature range. Moreover, the nucleation mechanisms of uranium in the electrodeposition process were evaluated, and the results indicated that nucleation and growth tend to occur via the same instantaneous mode at all applied temperatures and overpotential ranges. Finally, metallic uranium was deposited by potentiostatic electrolysis at an overpotential of −100 mV vs. U3+/U at different temperatures, and their morphologies and compositions were characterized by SEM-EDS and XRD, respectively. The results show that from 573 to 773 K, uranium deposits evolve form one-dimensional needle-like to multidimensional dendritic structures. No dendrite-free uranium deposits were obtained in the CsCl-containing melts regardless of the temperature.
研究领域:
材料科学
·
电化学
·
核工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）