JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Jun Cao,Qi Sun,Peng Wang,Jie Shen,Xue Dai
In order to solve the problem that separating zeolite 4A from solutions, we have synthesized Fe3O4/zeolite 4A magnetic nanocomposite by hydrothermal method. It is characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Vibrating Sample Magnetometer (VSM), scanning electron microscope (SEM) and Brunner-Emmet-teller (BET). The XRD result shows that Fe3O4/zeolite 4A magnetic nanocomposite has a good crystal structure. It also shows that Fe3O4/zeolite 4A magnetic nanocomposite contains two phases of zeolite 4A and Fe3O4 MNP. The optimal sample (Z-2) was judged by the calculation of crystallinity. The successful combination of zeolite 4A and Fe3O4 MNP was visually observed through SEM technology. The functional groups of Fe3O4/zeolite 4A magnetic nanocomposite were characterized by FTIR technology. The TEM result shows that some Fe3O4 MNPs enter zeolite 4A, which further clarifies the microstructure of Fe3O4/zeolite 4A magnetic nanocomposite. N2 adsorption-desorption technique confirms that Fe3O4/zeolite 4A magnetic nanocomposite SBET is 55.3374 m2/g and Dave is 9.7128 nm. VSM result shows that Fe3O4/zeolite 4A magnetic nanocomposite magnetization is 18.4534 emu/g. Simulation experiment shows that Fe3O4/zeolite 4A magnetic nanocomposite exhibit a fast response to an external magnetic field.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
磁性材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 41
·28389-28394
·
IF 3.9
Cheng-Lu Yang,Chen Liang,Chao Gao,Jun Guo,Bu-Ming Chen,Hui Huang
A novel Bi13S18I2 structure was synthesized using a facile one-pot hydrothermal method and further optimized as an anode material using graphene. The graphene/Bi13S18I2 composite achieved a high discharge capacity with an initial value of 1126.5 mA h g−1 and a high and stable discharge capacity of 287.1 mA h g−1 after 500 cycles compared with pure Bi13S18I2, which derives from the inhibited volume expansion and high electrical conductivity obtained from graphene. In situ XRD was performed to analyze the Li storage mechanism in depth. The results support the feasibility of the new ternary sulfide Bi13S18I2 as a promising lithium ion battery.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 14
·期 4
·5295-5304
·
IF 4.05
Tong Dongshen,Chen Xingtao,Dong Yuxiao,Fang Zhi,Zhang Hao,Zhou Chunhui,Yu Weihua
Kaolinite is a layered silicate material with a Janus character and has been directly used as the solid catalyst for the hydrolysis of cellulose in our previous work. Reducing sugar (RS) is one of the most important intermediates for the utilization of cellulose. In the present study, metal ions dispersed on kaolinite was easily prepared and further evaluated for the hydrolysis of cellulose to RS in water. The metal ions dispersed kaolinite was characterized by XRD, BET, SEM(EDS), and XPS. The catalytic results showed that copper was the best co-catalyst among the tested metal ions and the kaolinite treated with 4(wt)% copper nitrate by calcination at 623 K showed the highest total reducing sugar (TRS) yield of 51% under 478 K with the mass ratio of catalyst to cellulose of 0.2 and weight ratio of water to cellulose of 7 for 3 h. Moreover, the catalyst could be easily regenerated by calcination and the yield of TRS on the regenerated catalyst decreased from 51 to 43.2% after four times reuse. The characterization results revealed that copper was highly dispersed on the outer SiO 4 tetrahedral layer. The surface cuprous species were the active sites and could make the C-O bond cleavage easily by attacking the positively charged carbon atoms of the β-(1,4)-glycosidic linkage in the cellulose. The leaching of the cuprous species was responsible for the deactivation of the catalyst. The copper dispersed kaolinite is the efficient catalyst for the hydrolysis cellulose to reducing sugars and worth further development. Graphical abstract
研究领域:
催化
·
材料科学
·
环境化学
·
绿色化学
·
高分子科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Yaxin Feng,Guilin Wei,Yi Liu,Wenhong Han,Yan Chen,Runjie Sun,Lin Peng,Meihua Ma,Yu Zhang,Zhentao Zhang,Xirui Lu
The immobilization of iodine waste is a challenge in the field of nuclear waste . In this work, iodine waste (silver-coated silica gel with different iodine loadings) was immobilized at low-sintering temperatures (500, 550, and 600 °C). XRD represented that the crystallized phases of the sintered matrix consist of AgI and B 2 O 3 . The crystallization behavior of boron can be found as the sintering temperature increased from 500 °C to 600 °C. FT-IR results proved that in the process of crystallization, part of the microstructure related to B–O stretching transformed from [BO 4 ] to [BO 3 ] units, which benefits low-temperature iodine waste immobilization due to the bonding energy of [BO 3 ] is higher than that of [BO 4 ]. Our work reveals the B-related microstructure transition in low-temperature immobilization iodine waste.
研究领域:
核废物处理
·
材料科学
·
无机化学
·
放射化学
·
环境工程
✓ 已验证
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Xiaolei Song,Yuan Yu,Chunxia Wang,Mingqiao Ge
Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe‒O, ‒OH, ‒O‒C‒O‒ and ‒CH2‒ were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
研究领域:
材料科学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 105
·86620-86624
·
IF 3.84
Tao Wang,Huiping Zhang,Ying Yan
A novel porous zeolite beta coating/PSSF composite was prepared by secondary growth method in fluoride media. The morphology of zeolite beta coating/PSSF composite was characterized by SEM and the structural and textual properties of composite were characterized by XRD and N2 adsorption/desorption isotherms on ASAP 2020, respectively. The thermal stability of composite was analyzed by thermogravimetry (TG) and differential scanning calorimetry (DSC). The results indicated that well-intergrown and continuous zeolite beta coating with highly crystallinity were successfully synthesized on the surface of paper-like stainless steel fibers support. The structures of zeolite beta coating/PSSF composite were three-dimensional network with large void volume and majority of microporous structure. The thickness of zeolite beta coating on stainless steel fibers is approximate 2 μm. The specific surface area (SBET) and the total pore volume of composite were 118 m2 g−1 and 0.067 cm3 g−1, respectively. The composite was stable at temperature up to 650 °C.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Functional Diamond
·
2022
·
IF 0
Zhiqiang Hou,Haikuo Wang,Yao Tang,Jiakun Wu,Chao Wang,Zhicai Zhang,Xiaoping Ouyang
Carbon, the fourth most abundant element in the Universe, possesses numerous allotropes with diverse bonding character (sp1-, sp2- and sp3-hybridized bonds) and structural motif of the constituting atoms. In particular, the carbon materials with a fully or nearly 100% sp3-hybridized strong C-C bonds often lead to excellent mechanical properties, chemical stability, thermal and optical properties, such as crystalline diamond and diamond-like amorphous carbon (DLC). In this review, we systematically summarize the synthesis, microstructure, mechanical properties, thermal and optical properties of ultrahard carbon materials with current experimental results on nano-polycrystalline diamond (NPD), nanotwinned diamond (NTD), micro-grained polycrystalline diamond (MPD), and amorphous diamond/carbon. In addition, we discuss the difference of spectra of XRD, Raman and EELS between various nanocrystalline diamond powder and ultrahard carbon materials. Finally, we provide our insights into the future development and applications in the research of ultrahard carbon bulk materials by high-pressure and high-temperature techniques according to the current advantages, limitations and challenges in the experiment.
研究领域:
材料科学
·
凝聚态物理
·
光谱学
✓ 已验证
DOI
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Mingjun Lu,Rongting Guo,Wei Li,Yiju Lv,Fushun Tang,Weiyi Feng,Zheng Liu,Guo-Cheng Han,Zhihua Zhan
The interfacial characterization of the cathode material Na 2 FePO 4 F with carbon capping material Na 2 FePO 4 F@C taking bagasse as the carbon source is reported. Both the higher-capacity Na 2 FePO 4 F@C material (93 mAh/g) and lower-capacity Na 2 FePO 4 F material (10 mAh/g) showed different degrees of capacity decay during cycling. The rupture and spontaneous repair process of the solid electrolyte interface (SEI) film resulting in increased impedance and blocked charge transfer, as well as irreversible changes in the surface microstructure of the electrode material after cycling, which are responsible for the decrease in capacity. The XRD and FTIR results before and after cycling shown that the characteristic peaks of the carbon coated material Na 2 FePO 4 F@C and raw material Na 2 FePO 4 F were consistent, indicated that their functional groups and crystalline structures are not the main causes of capacity decay at low cycling times (within 50 cycles).
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
界面化学
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Zhoufei Yang,Jin Wang,Chaojie Cui,Ying Jin,Gang Zhang,Henghui Zhou,Weizhong Qian
Compared with aluminum foil (Al foil), the three-dimensional (3D) aluminum foam (Al foam) has the characteristics of 3D interconnected metal wires and through-hole structure with high specific surface area, which exhibits great potential for application in high-power energy storage devices. In this work, 3D Al foam-based and Al foil-based cathode sheets were fabricated and assembled into pouch cells. In-situ XRD was employed to analyze the electrochemical reaction behavior of the two types of porous electrodes . The 3D Al foam-based cathode demonstrated faster electron transfer and lithium-ion diffusion as compared to the Al foil-based electrode, which is helpful for a uniform electrochemical reaction and decreases the electrochemical polarization. Electrochemical simulations and porous electrode models were built to understand these phenomena. The Al foam-based LiFePO 4 batteries exhibit much better power and energy performance than Al foil-based LiFePO 4 battery. The power density of the Al foam pouch cells is 7.0–7.7 kW/L when the energy density is 230–367 Wh/L, which is the highest power and energy density among reported Al foam-based devices. The new findings open up opportunities for the development of high-power and high-energy-density commercial batteries.
研究领域:
电化学
·
材料科学
·
能源存储
·
电池技术
·
多孔材料
·
固态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 15
·12620-12627
·
IF 2.22
Ma Xiaomeng,Li Congyi,Fan Zijia,Wu Haitao,Zhang Yuping,Zhang Zhiliang
Low temperature-sintered ceramics Nd 2 Zr 3 (MoO 4 ) 9 were successfully prepared via reaction-sintering method. The sintering behavior, microwave dielectric properties, crystal structure, and microstructure were analyzed systematically. XRD and Rietveld refinement results revealed that all samples formed a pure trigonal structure phase with the space group of R-3c. Density determination showed that ceramics possessed the highest relative density when sintered at 800 °C for 6 h. SEM image further confirmed that ceramics possessed dense and homogeneous microstructure at the optimum sintering temperature 800 °C. Far infrared spectra analysis showed the structural phonon oscillation at infrared region played an important role in polarization. Nd 2 Zr 3 (MoO 4 ) 9 ceramics obtained the optimum microwave dielectric properties of ε r = 10.01, Q × f = 55,923 GHz, τ f = − 13.81 ppm/ °C when sintered at 800 °C for 6 h.
研究领域:
材料科学
·
陶瓷
·
微波介电材料
·
固体化学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2018
·
IF 4.374
Huajun Chen,Wenjie Tian,Wuxiu Ding
Metallic sliver-doped mesoporous Al 2 O 3 fibers (meso-Ag/Al 2 O 3 ) that can harvest visible light to speed up solar water purification, were synthesized by one-pot hydrothermal method. Insightful analyses of XRD, XRF and XPS of meso-Ag/ Al 2 O 3 verified that metallic silver occupied interstitial positions of Al 2 O 3 lattice forming interstitial solid solution. N 2 adsorption/desorption illustrated that meso-Ag/Al 2 O 3 exhibited significantly increases in the specific surface area, pore volume and average pore diameter after doping with silver. The UV–Vis diffuse reflectance spectra and disinfection performance indicated that meso-Ag/Al 2 O 3 can harvest visible light to promote the conversion of dioxygen to ROS for water disinfection compared with the widely used TiO 2 . With our approach, we achieved water disinfection of >99.999% inactivation of bacteria in 120 min with a small amount of material (8 mg/L) under simulated visible light.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Haiyan Yang,Yang Zhou,Dongshen Tong,Miao Yang,Kai Fang,Chunhui Zhou,Weihua Yu
Cellulose is the most abundant form of biomass on earth, and is considered as an alternative for fuels and chemicals. The hydrolysis of cellulose to platform compounds, such as reducing sugars (RS), is one of the most important ways for the utilization of cellulose. In this study, the solid acid catalysts of SO 4 2− -ZrO 2 /montmorillonite (SZ-Mt) were prepared by coupling SO 4 2− with ZrO 2 and then introducing into the interlayer of Mt using the coprecipitation method. Meanwhile, the catalytic performance of the SZ-Mt catalysts for the hydrolysis of cellulose to RS in water was studied. The catalysts were characterized by XRD , FT-IR, BET, SEM(EDS), NH 3 -TPD and XPS . The catalytic results showed that the SZ-Mt composite calcined at 500 °C with the molar ratio of S/Zr of 0.3 showed the highest total reducing sugars yield of 30.1%. The characterization results revealed that the surface S O bonds of sulfated zirconium oxide could gradually change from O=S-OH groups (type I, -HSO 4 ) to O=S=O groups (type II, -S 2 O 7 ). It was concluded that the surface S-OH groups in type I were responsible for the hydrolysis of cellulose in the low molar ratio of S/Zr and the new S-OH bonds formed by breaking the S-O-S bonds in type II were contributed to the conversion of cellulose in the high molar ratio of S/Zr. Finally, the mechanism of cellulose hydrolysis on the SZ composites was suggested.
研究领域:
化学工程
·
材料科学
·
生物化学
✓ 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）