JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 9
·6780-6790
·
IF 2.779
Yang Yusheng,Zhang Shuyan,Wang Tuoyao,Zhao Ran,Zhao Zengwu
Energy storage devices and conversion systems have attracted more and more attention with the rapid development of clean energy. Iron oxide is widely used as electrode materials and electrocatalysts because of its abundant resource, low cost, and superior electrical and catalytic properties. Doping sulfur in iron oxide is an effective method to improve electrochemical and photocatalytic performance. The common synthesis method of sulfur-doped iron oxide is a three-step method of co-precipitation, hydrothermal, and calcination. This method has to be performed under high pressure and high temperature, so it needs to consume more energy. In this work, the electrochemical synthesis of sulfur-doped iron oxide was investigated under atmospheric pressure and temperature in the aqueous ferrous sulfate solution that was used as the precursors of sulfur, iron and oxygen. The influences of solution pH on the electrochemical synthesis process and the composition and morphology of deposits were investigated by the analyses of electrochemical reaction and SEM–EDS of deposits. It was found that the oxygen content in the deposit decreased as the pH value of the solution increased. There were three electrochemical reduction processes in sequence from positive to negative potential, followed by the underpotential deposition of iron on the platinum electrode, hydrogen evolution and sulfur doping. The sheet sulfur-doped iron oxide was successfully prepared by electrodeposition under a potential more negative than −1.70 V vs MSE. The kinetics of the electrochemical reaction of iron ions on the platinum electrode was investigated. The reduction process was a quasi-reversible process controlled by diffusion. The heterogeneous charge transfer rate constant k s and the diffusion coefficient D were obtained.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2011
·
IF 1.675
Hong Zhang,Chao Li,Jinshan Guo,Limin Zang,Jiahe Luo
Poly(methyl methacrylate)/SiO2 (PMMA/SiO2) hybrid composites were prepared via “grafting onto” strategy based on UV irradiation in the presence of iron aqueous solution. Two steps were used to graft polymethyl methacrylate (PMMA) onto the surface of nanosilica, anchoring 3-(methacryloxy) propyl trimethoxysilane (MPTS) onto the surface of nanosilica to modify it with double bonds, and then grafting PMMA onto the surface of nanosilica with FeCl3 as photoinitiator. The products were characterized by FT-IR, TGA, TEM, DLS, and XPS. The results showed that it is easy to graft PMMA onto the surface of nanosilica under UV irradiation, and the hybrid particles are monodisperse and have core-shell structure with nanosilica as the core and PMMA layers as the shell. Furthermore, the products initiated by FeCl3 have higher monomer conversion, percent grafting, and better monodispersion compared with the products initiated by traditional photoinitiator such as 2-hydroxy-4-(2-hydroxyethoxy)-2-methyl-propiophenone (Irgacure 2959).
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2018
·Vol. 70
·期 12
·2837-2845
·
IF 2.145
Zhang Weiguang,Zhang Ting-An,Lv Guozhi,Zhou Weihua,Cao Xuejiao,Zhu Hangyu
The solvent extraction and separation process of Sc(III) and Fe(III) from a strongly acidic and highly concentrated ferric solution using mixtures of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) in sulfonated kerosene was studied. The effects of various parameters, including D2EHPA concentration, dosage of TBP, and phase ratio, were investigated for the extraction process. The results indicated that the extraction rate of Sc(III) was 99.72% with 1.09% Fe(III) co-extracted after two stages of counter-current extraction under optimal conditions. Moreover, saturation capacity and slope analysis were used to determine the reaction mechanism. Sc(III) is extracted in the form of HSc(SO 4 ) 2 ·4HL. Further separation of Sc(III) and Fe(III) was realized in a scrubbing and stripping process. First, 98.67% of the co-extracted iron in the loaded organic phase was scrubbed with a dilute HCl solution by a three-stage counter-current scrubbing. Then, 85.00% of Sc(III) can be stripped efficiently with a 2-mol/L NaOH solution saturated in 1-mol/L NaCl by three-stage cross-current stripping.
研究领域:
化学工程
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 44
·7460-7467
·
IF 2.7
Zhaolu He,Haiyang Xian,Liang Xu,Jianxi Zhu,Mang Lin,Xiaoliang Liang,Hongping He
Accurately quantifying hydrogen peroxide (H2O2) is essential for elucidating its role across diverse environments. Spectrophotometry is widely employed in laboratories for this purpose due to its convenience, cost-effectiveness, and low detection limits for micromolar H2O2 concentrations. However, accurate measurement of H2O2 in iron-containing solutions presents challenges due to the interference of iron ions. In this study, we propose a modified spectrophotometric method for H2O2 determination in iron-containing solutions by adding two types of iron ion chelators and selecting leuco crystal violet (LCV) as a chromogenic reagent due to its stability. By sequentially adding 1,10-phenanthroline and EDTA, and using a phosphate buffer at pH 4.2 to provide the optimal chromogenic pH condition, this modified method effectively mitigates the interference of iron ions in the LCV chromogenic reaction. The applicability of this method under aerobic and anaerobic conditions was confirmed by comparing the experimental results with theoretical simulations. Under optimal chromogenic conditions, this method achieves a detection limit of 300 nM. This improved method allows better detection of H2O2 in iron-containing systems and investigation of its significance in various environmental processes.
研究领域:
分析化学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 18
·3434-3443
·
IF 7.571
Xuemei Li,Zhiwei Liu,Yongri Liang,Li-Min Wang,Ying Dan Liu
A conductive hydrogel P(AAm-co-AA)/CS-Fe3+ with double cross-linked networks was fabricated using a one-step polymerization by UV irradiation and a soaking process in Fe(NO3)3 solution. In this hydrogel, the rigid chain of chitosan (CS) and the soft chain of copolymer P(AAm-co-AA) with acrylic acid (AA) and acrylamide (AAm) act as the backbone, among which large amounts of hydrogen bonds are formed by the amino, hydroxyl, and carboxyl groups on the two polymers. Ferric irons (Fe3+) are introduced and form coordination interactions with carboxyl and amino groups of the polymers. The double cross-linked interactions in the system can enhance the tensile strength and toughness of the hydrogel. Thus, the prepared P(AAm-co-AA)/CS-Fe3+ hybrid network hydrogel shows excellent mechanical properties in many aspects: a strength of up to 550 kPa, a broad strain-range up to 800%, fast self-recovery ability (30 min), and low hysteresis strain (<100%). The conductive hydrogel demonstrates high strain sensitivity (gauge factor (GF) = 6.6 at a strain of 700%) as a flexible sensor. Human movements (for example, finger bending, vocal cord vibration, and other human activities) can be sensitively detected using the P(AAm-co-AA)/CS-Fe3+ hydrogel sensor.
研究领域:
材料科学
·
传感器技术
·
纳米技术
·
生物医学工程
✓ 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）