JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Linjing Liu,Bin Yang,Rui Lv,Qiangwei Kou,Shuai Yang,Hang Xie,Yuan Sun,Yunfei Chang,Shan-Tao Zhang,Fei Li
Piezoceramics with high and fatigue-resisted piezoelectric properties are strongly desired for actuator applications. In this work, textured Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zr, Ti)O 3 ceramics with Lotgering factor F 001 ∼98% were fabricated by templated grain growth technique. Strong [001] c -grain orientation ( f ∼90% and r ∼0.22) of the textured ceramics effectively produced about 230% enhanced piezoelectric coefficient d 33 * (i.e., S max / E max ) and substantially improved unipolar electrical fatigue resistance. Unipolar polarization P max and d 33 * of the textured ceramics were nearly maintained up to 10 6 unipolar cycles, while 19% and 14% degradations were respectively observed from randomly oriented counterparts. Especially, normalized d 33 * of the textured ceramics shows better unipolar fatigue resistance than those of piezoceramics reported previously. Much lower bipolar strain asymmetry γ s (∼4%) was observed from the textured samples fatigued after 10 6 unipolar cycles as compared to γ s ∼23% for randomly oriented counterparts. While charged defect accumulation model described the serious fatigue deteriorations in randomly oriented ceramics, the current work revealed that substantially enhanced unipolar fatigue resistance of the textured ceramics is mainly associated with the inherent fatigue anisotropy, weakened local bias fields owing to both enhanced domain mobility and lower defect density near grain boundaries/interfaces, and increased intrinsic contribution due to more tetragonal content. These superior characteristics suggest the great potential of textured ceramics for high-performance and robust actuator applications.
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 ANALYTICAL CHEMISTRY
·
2025
·Vol. 80
·期 7
·1163-1169
·
IF 1.1
Li Xichen,Lin Zhengzhong
Lead ions in food can accumulate in the human body, leading to various diseases, so it is necessary to detect the content of lead ions in food. In this paper, a new Schiff base was prepared using derivatives of isophthalic acid and salicylaldehyde as a photoresponsive probe for Pb(II) ions. The Schiff base probe had an absorption peak at 505 nm after the addition of Pb(II) ions to an acetonitrile solution. However, other inorganic ions caused only slight absorbance changes at 505 nm. Based on this, a visible light analysis method for Pb(II) ions was established. The equilibrium time of the Schiff base probe with Pb(II) ions was 5 min, with a linear range of 2.5–25 ppm. The Schiff base probe was used to detect Pb(II) ion content in mustard samples, and the recoveries were over 90%. The detection results were not significantly different from those of the standard method, indicating that the Schiff base probe can be used for the rapid determination of Pb(II) ion content in real samples.
研究领域:
分析化学
·
环境化学
·
食品安全
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Zhihui Wang,Peisen Huang,Yanghao Yan,Yu Tao,Wu Lei,Mingzhu Xia,Fengyun Wang
Heavy metals and dyes present in industrial wastewater pose a significant threat to both the ecological environment and human health. In this study, we have developed a multifunctional adsorbent, SEP/PR, which is obtained by modifying sepiolite with polyrhodanine. The purpose of this adsorbent is to effectively remove Pb 2+ ions and Congo red (CR) dye from contaminated water sources. The adsorbents were systematically characterized using SEM, EDS, XRD, BET, FT-IR and XPS. Compared with raw sepiolite, SEP/PR exhibited better adsorption performance due to its abundant adsorption sites. The adsorption of Pb 2+ and CR on SEP/PR can be described by pseudo-second-order and Langmuir models, and the preferential adsorption capacities were still satisfactory even in the presence of interference. The maximum adsorption of Pb 2+ and CR was 423.29 mg/g and 894.76 mg/g, respectively, at 298 K. It is noteworthy that the removal rates of both Pb 2+ and CR were increased in the binary Pb 2+ -CR system. These observed increases can be attributed to the introduction of additional adsorption sites, as well as the electrostatic attractions that occur between the adsorbed Pb 2+ (+) and CR (−) ions. The adsorption mechanism for Pb 2+ primarily involves complexation, while for CR, it involves a combination of electrostatic interactions, hydrogen bonding, and π-π interactions. Finally, SEP/PR has good reusability and practical application capabilities. This study shows that SEP/PR is simple to synthesize and can be used for the synergistic removal of heavy metals and dyes in complex systems.
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
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Yonghui Ye,Yu Zhang,Xintong Yan,Gong Ning,Shi Hu
A facile one-step method is employed to synthesize carbon-supported Pd–Pb binary metal catalysts for the ethanol oxidation reaction (EOR) in alkaline electrolytes. A variety of characterization techniques have demonstrated that the alloying of Pd with Pb alters the electronic structure and induces lattice expansion. Electrochemical tests for the EOR in alkaline electrolytes demonstrated that the Pd3Pb/C catalyst exhibited the highest mass activity (3.59 A mgPd−1) and specific activity (17.97 mA cm−2), which are 4.6 and 4.7 times those of the Pd/C catalyst prepared by the same method, respectively. The intercalation of lead atoms has altered both the lattice and the electronic structure of palladium, leading to opposing shifts in the d-band center that collectively optimize the adsorption strength of CO* and OH*, key intermediates of the EOR. Consequently, the Pd3Pb/C electrocatalyst exhibits significant EOR catalytic activity. This study provides a viable implementation plan and analytical strategy for optimizing palladium-based catalysts with non-noble metals by integrating electronic transfer, bifunctional effects, and d-band center adjustments for bimetallic catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER COMPOSITES
·
2024
·
IF 4.8
Yinan Yan,Bianying Wen
Using polymer-grafts to improve the interfacial compatibilization of composites is by far the most common and effective strategy. However, although polybutene-1 (PB) resin enjoys the reputation of “gold plastic” in the field of industry, there are few studies on its grafting and functional modification. In this work, PB-grafts were prepared by melt grafting method with maleic anhydride (MAH) and styrene (St) as the functional monomers. The effect of two PB-grafts (PB-g-MAH and PB-g-MAH-co-St) on the interfacial compatibilization of PB/GNP (Graphene nanosheet) thermally conductive composites was compared and the corresponding compatibilizing mechanism is discussed. Results indicate that PB-g-MAH-co-St has better compatibizing effect than that of PB-g-MAH because the cooperation of St with MAH enhanced the grafting degree of functional monomers on PB, and increased the surface energy of PB-g-MAH-co-St, which reduced the interface energy between PB and GNP and improved its interfacial adhesion. A better compatibilization effect has achieved when the compatibilizer and filler at the mass ratio of 1:4. Under this ratio, when the content of GNP is 30 wt%, the thermal conductivity and electrical conductivity of PB/GNP/ PB-g-MAH-co-St composite achieved 1.82 W·m −1 ·K −1 and 8.44 × 10 −8 S·cm −1 , which are 857.89% and 9 orders of magnitude higher than that of neat PB, respectively. Moreover, the composite has good mechanical properties and processability, which is beneficial to industrialization. Highlights PB-g-MAH-co-St has higher grafting ratio than that of PB-g-MAH. The surface energy of PB/GNP composites is reduced by use of PB-g-MAH-co-St. There is a suitable mass ratio between compatibilizer and filler. The composite of PB/GNP/PB-g-MAH-co-St achieved high thermal conductivity. The PB/GNP/PB-g-MAH-co-St composites have good melting processability.
研究领域:
材料科学
·
高分子科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 12
·1383
·
IF 2.935
Jian Shen,Nan Wang,Yang Guang Wang,Di Yu,Xiao–kun Ouyang
Composite adsorption materials combine the advantages of various adsorptive materials and compensate for the defects of single adsorbents. Magnetic montmorillonite (MMMT) shows good adsorption properties for Pb(II). In order to further improve the adsorption properties of MMMT, in this work, Zn-BDC, a kind of metal–organic framework (MOF), was modified onto the surface of MMMT by in situ polymerization. The composite material MMMT@Zn-BDC was characterized by Zetasizer, SEM, TEM, FTIR, XRD, VSM, and XPS. The influence of adsorption conditions on the adsorption capacity of MMMT@Zn-BDC for Pb(II) was examined, including the adsorbent dosage, pH of Pb(II) solution, initial concentration of Pb(II), and the temperature and adsorption time. Also, the adsorption mechanism was studied. The results of this study show that MMMT@Zn-BDC adsorbs Pb(II) via chemisorption. In addition, MMMT@Zn-BDC exhibits good potential for adsorbing Pb(II), including its high adsorption capacity (724.64 mg/g) and good recyclability.Keywords:Zn-BDC;magnetic montmorillonite;Pb(II);adsorption
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2016
·
IF 1.272
Jiang Haiyan,Zhao Qiuxiang,Zeng Ying
In this study, modified polyvinyl alcohol (PVA) was prepared and characterized by element analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and surface area and proximity analysis. The isotherms and thermodynamic parameters of the modified PVA adsorption process were estimated. The data indicate that the adsorption process is exothermic, feasible, spontaneous, and fit to the Langmuir isotherm model. The maximum adsorption capacities for Cd(II) and Pb(II) were calculated to be 1.19 and 1.48 mmol/g, respectively. Sorption was rapid, with the removal percentage higher than 98% after 10 min. Adsorption behavior mechanisms were analyzed using pseudo-first-order and pseudo-second-order models, which were highly fitted to pseudo-second-order model. This suggests the main adsorption mechanism is a chemical adsorption, involving ion exchange and valence forces through sharing or exchange of electrons between metal ions and modified PVA. The modified PVA is a good reusable sorbent, enhancing the economics of practical application for the removal of Cd(II) and Pb(II) from water and wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of the Iranian Chemical Society
·
2023
·
IF 2.4
Fu Qiuping,Hu Jing,Zhou Shaoqi
Graphene oxide@sodium alginate (GO@SA) composites were prepared by combining graphene oxide (GO) with sodium alginate (SA) for adsorption of Pb(II). Fourier-transform infrared spectra (FT-IR) and field emission scanning electron microscopy (FESEM) were used to characterize the structure and morphology of the composites. And the adsorption performance of Pb(II) by GO@SA was studied. The adsorption capacity of Pb(II) by GO@SA increased with the increase of pH and temperature. The adsorption process was consistent with the Langmuir isothermal adsorption model and quasi-second-order kinetic model, and the adsorption process was spontaneous and endothermic. At 303.15 K, the maximum adsorption capacity fitted by the Langmuir isothermal model was 241.5 mg/g.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Lili Yan,Long Kong,Zan Qu,Liang Li,Guoqing Shen
Magnetic biochar/ZnS composites were successfully synthesized by deposition of ZnS nanocrystals (NCs) on magnetic biochar in a polyol solution. The as-prepared composites showed a high maximum adsorption capacity for Pb (II) up to 367.65 mg g–1, which was 10 times higher than that of reported magnetic biochar. Furthermore, the lead-laden magnetic biochar/ZnS composites can be easily separated from the solution by a magnet after adsorption because of the excellent superparamagnetic properties. The composites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The adsorption process was well described by the pseudo-first-order model, and the adsorption isotherm could be well fitted by the Langmuir model. The thermodynamic studies showed that the removal of Pb (II) was an endothermic and spontaneous process. The present results warrant the promising application of magnetic biochar/ZnS composites in removal of Pb (II) from contaminated water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Shiyi Zhang,Mengdi Cheng,Yangxi Yan,Zhimin Li,Pangpang Wang,Ri-ichi Murakami,Dongyan Zhang
High-performance piezoelectric materials , whose displacement is sensitive to an external field and vice versa, are constantly required in electromechanical applications. Here, we introduce Nd 3+ ions into 0.49Pb(Nb 2/3 Ni 1/3 )O 3 -0.51Pb(Hf 0.3 Ti 0.7 )O 3 (PNN-PHT) ceramics via the solid-state method. By constructing a ferroelectric system in the morphotropic phase boundary region and exploiting the synergistic effect of polar nanoregions and an enhanced local structural heterogeneity, excellent piezoelectricity and dielectric properties are obtained. The optimized piezoelectric coefficient d 33 , dielectric constant ε 33 , electromechanical coupling factor k p , and dielectric loss tanδ are 1125 pC/N, 8667, 0.66 %, and 1.94 %, respectively. The Vogel-Fulcher law and relaxation analysis were adopted to understand the origin of the high piezoelectricity. The Rayleigh analysis method was used to study the intrinsic and extrinsic contributions to the piezoelectricity of the Nd-doped PNN-PHT ceramics, the extrinsic contribution was found to be up to 19 % in the optimal region (PNN-PHT + 0.4 at. % Nd 2 O 3 ). Moreover, according to in-situ ferroelectric measurements and fatigue measurements, the PNN-PHT + 0.4 at. % Nd 2 O 3 ceramic exhibits excellent fatigue resistance and stable piezoelectric behavior at 60 ℃ . This work provides an approach to realize high-performance piezoelectric ceramics with good electromechanical stability under external condition, which is expected to expand the range of application of piezoelectric materials, e.g., for transducers.
研究领域:
材料科学
·
电陶瓷
·
压电材料
·
铁电材料
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 5
·1185-1196
·
IF 4.204
Liu Wanyue,Liu Xiaoqin,Chang Jinming,Jiang Feng,Pang Shishi,Gao Hejun,Liao Yunwen,Yu Sheng
The magnetic nitrogen-doped carbon (MNC) was prepared from polypyrrole by a simple high temperature calcination process in this paper. The structure and properties of MNC were analyzed by scanning electron microscope, Fourier transform infrared spectroscopy, X-ray diffraction, Brunner-Emmet-Teller, vibrating sample magnetometer, and X-ray photoelectron spectroscopy. The capacity of MNC to adsorb Cr(VI) and Pb(II) was evaluated. The effects of the initial pH, dosage, concentration and temperature on the adsorption capacity of MNC were measured. MNC had a large specific surface area and a special porous structure. Its nitrogen and carbon sources were rich, and the ratio of carbon to nitrogen was fixed. The maximum Cr(VI)-adsorption capacity and maximum Pb(II) adsorption capacity of MNC could reach 456.63 and 507.13 mg·g −1 at 318 K, respectively. The pseudo-second-order model was used to describe the adsorption kinetics of MNC, and the Freundlich model was employed to discuss its isotherms. The adsorption process was affected by the electrostatic force, the reducing reaction, pores and chelation. The results of this study suggest that MNC is a material with superior performance, and is very easily regenerated, reused, and separated in the adsorption process.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CONTAMINANT HYDROLOGY
·
2024
·
IF 3.5
Yuting Song,Hongyan Deng,Wenbin Li,Shuni Zhou,Xin Liu
To study the pollutants immobilization and economy of biologically amended coastal soil , Alternanthera philoxeroides biomass (Bm), biochar (Bc), and dodecyldimethyl betaine (BS) modified Bc (BS-Bc) were used to amend coastal soil from Jialing, Fu, and Qu River. A runoff experiment was used to simulate the longitudinal migration and morphological changes of Pb(II) and chlortetracycline (CTC) in each amended coastal soil, and the economy of pollutants immobilization by different amended coastal soil were compared. The equilibrium time of Pb(II) and CTC in each amended coastal soil ranked in the order of BS-Bc-amended > Bc-amended > Bm-amended > unamended coastal soil. The average Pb(II) and CTC flow rate in different amended coastal soils presented an opposite trend with the equilibrium time. Pb(II) and CTC content all reduced with the increasing runoff length. Under the same soils, the content changes presented Bm and Bc amended > unamended > BS-Bc amended. CEC and clay content of coastal soils were the key factors affecting Pb(II) and CTC immobilization. The immobilization mechanisms were electrostatic attraction, ion exchange, surface precipitation, and complexation to Pb(II) and ion exchange and complexation to CTC. The economy of Pb(II) and CTC immobilization ranged from 0.5 to 9.0 and from 1.0 to 5.4 mg/¥, and coastal soil amended by BS-Bc had practical application value and high economy.
研究领域:
环境科学
·
生物学
✓ 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）