NANOTECHNOLOGY
·
2021
·Vol. 32
·期 47
·475708
·
IF 3.874
Qiu-Ping He,Yun Zou,Peng-Fei Wang,Xiao-ming Dou
Silicalite-1 zeolitic membranes have been successfully fabricated on the porous α-Al2O3 support by templated and template-free protocol, respectively, for vapor permeation separation of dichlorobenzene (DCB) isomers. After proving the high quality of the membranes by single gas permeation (He and SF6) performance, the vapor-permeation of DCB isomers over two types of the silicalite-1 membrane was then investigated. The separation results clearly indicated that under the lower partial pressure and higher temperature, the effect of DCB isomer adsorption on the permeance could be kept at a sufficiently low level and sharp selectivity become more important. Thus, high p-DCB selectivity could be achieved. Comparatively, the template-free silicalite-1 zeolite has a much higher p-DCB selectivity due to the relatively fewer inter-crystalline gaps. Under certain separation conditions, the highest selectivity of p-DCB for p-/m-DCB and p-/o-DCB binary systems could reach 165 and 113, respectively.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 16
·5763
·
IF 3.748
Minmin Zou,Hexin Zhu,Ming Dong,Tian Zhao
As one of the most important prototypical chromium-based MOFs, MIL-101(Cr) is well-studied and widely employed in various scientific fields. However, due to its small capture window sizes and curved internal apertures, its application in large molecular removal is quite limited, and given its high stability and high synthetic temperature (>200 °C), it is difficult to achieve hierarchically porous MIL-101(Cr). In our study, hierarchically porous MIL-101(Cr) involving a high macro-/meso-/micropores ratio was designed and synthesized using acetic acid as an additive and silicon dioxide (SiO2) nanoparticles as a template. The optimal hierarchically porous MIL-101(Cr) (A-4) possessed a high specific surface area (2693 m2g−1) and an abundant macro-/mesoporous structure with the addition of SiO2of 200 mg. Compared with the control sample (A-0) with a less macro-/mesoporous structure, A-4 showed good adsorption properties for both coomassie brilliant blue R-250 (CBB, 82.1 mg g−1) and methylene blue (MB, 34.3 mg g−1) dyes, which were 1.36 times and 9.37 times higher than those of A-0. Moreover, A-4 also had good recyclability, and the removal rate of CBB was still higher than 85% after five cycles of adsorption.Keywords:MIL-101(Cr);SiO2;dye adsorption;template
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Lang Wen,Xuedan Chen,Chao Chen,Ruisong Yang,Min Gong,Yiguo Zhang,Qingshan Fu
Chitosan/MOF composite porous monolith used in water remediation as adsorbent can realize high-efficient removal of pollutant in water and facile recycling from water. However, dissolution of chitosan (without crosslinking) in acidic aqueous solution will cause breakage of composite monolith. Herein, we report a chitosan/UiO-66 monolith prepared by ice-templating method. Specially, a pre-crosslinking treatment (by glutaraldehyde) is employed before the monolith formation, which obviously boosts its stability in aqueous solution. The composite monolith is evaluated by SEM, N 2 adsorption, XRD, and batch adsorption tests for Congo Red (CR). The results show that the composite monolith possesses a typical ice-templating structure with hierarchical (mirco- / meso- and macro-) pores. UiO-66 particles are embedded on the surface of chitosan matrix, and the crystal structure of UiO-66 is not changed obviously by the crosslinking and freezing process. The composite monolith exhibits high adsorption efficiency (90% of CR was removed from its aqueous solution in 60 min) and the maximum adsorption capacity of 246.21 mg/g (derived from Langmuir model) can be reached. After adsorption, the monolith is collected by a facile procedure and recovered using ethanol for evaluating its reusability. After 4 cycles, the CR removal efficiency of the composite monolith still remains ~90% of the initial efficiency. This work demonstrates that the simple crosslinking procedure before monolith formation can ensure the intact shape of the chitosan/MOF monolith during adsorption.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Jianfeng Zhu,Lei Wang,Shouwu Guo
The morphology of MAX phase powders significantly influences their microwave absorption properties. However, the traditional synthesis via solid-state reactions produces irregular powders, and the preparation of MAX phase powders with specific morphology remains a challenge. Herein, (V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium, titanium, chromium, aluminum , and short carbon fibers as precursors. It was found that despite acting as a carbon source, carbon fibers also acted as sacrificial templates. By adjusting the molar ratio of metal powders and short carbon fibers, a series of carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with core-sheath structure were also obtained. Carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance. The reflection loss (RL) value reached up to –63.26 dB at 2.40 mm, and the effective absorption bandwidth (EAB) was about 5.28 GHz with a thickness of 2.02 mm. Based on the electromagnetic parameter analysis and theoretical simulation, the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss, magnetic loss, multiple reflection, and scattering. This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 16
·7778-7790
·
IF 4.682
Zhao Haijia,Qu Jiakang,Li Xianyang,Zhao Zhuqing,Chen Xiang,Xie Hongwei,Yin Huayi
Advanced high-performance functional materials rely on their specific morphological structures designed by template method. However, the current template methods suffer from the complex template-removal process. The molten salts have an ability to dissolve some specific materials and could be easily removed by water. Thus, the molten salts could be employed as a not only solvent but also template. Herein, the Na 2 CO 3 –K 2 CO 3 and NaCl–KCl molten salts were employed as both solvents and templates to synthesize the carbonates (CaCO 3 , BaCO 3 , or SrCO 3 ) with diverse morphologies. And then the carbonates, which are soluble in molten salts and insoluble in water, were added into the high-temperature molten salt to form a homogeneous liquid phase. Subsequently, the molten salts templates can be easily removed in water after solidification. After removing the templates, the carbonates with fine particles and strip-shaped belts could be obtained in Na 2 CO 3 –K 2 CO 3 and NaCl–KCl molten salt, respectively, indicating that the different molten salts have diverse template effects. Overall, molten salts are a promising soft and water-soluble template for materials’ structural design.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xing Li,Lintao Chen,Yugo Osaka,Zhaohong He,Lisheng Deng,Hongyu Huang
Sulfur dioxide (SO 2 ) emissions from ship exhaust pose a serious threat to the environment and human health. In this study, various manganese oxide (MnO x ) samples with different physical and chemical structures were prepared using template, precipitation, ball milling, calcination, and microwave methods for the desulfurization of ship exhaust. The MnO x samples were characterized intensively through scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller analysis. The desulfurization performance was measured via thermogravimetry, and the desulfurization mechanism of the different MnO x samples was investigated. Results showed that the desulfurization performance of MnO x was determined by the comprehensive influence of the material’s pore structure, specific surface area, crystal structure, Mn valence content, and reaction temperature. The pore structure in MnO x considerably affected the desulfurization performance of MnO x . In our experiment, tp-MnO x prepared using the template method presented a rich 3D pore structure, a large specific surface area, and excellent desulfurization performance. At 400 °C, the average SO 2 capture rate of tp-MnO x in the first hour was 0.283 g SO2 /g material ·h. The highest SO 2 capture rate of tp-MnO x was 0.694 g SO2 /g material observed at 500 °C.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 37
·期 6
·1768-1775
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IF 2.966
Yanfang Song,Dandan Zhou,Yonggang Wang,Congxiao Wang,Yongyao Xia
Nitrogen-containing mesoporous carbons (NMCs) were prepared from quinoline-polymerized pitch using mesoporous silica as a template. The effects of the ratio of quinoline-polymerized pitch/silica template and carbonization temperature on the capacitive performance of NMCs were extensively studied. The NMC synthesized at a pitch–silica template ratio of 1.5 and carbonized at 750 °C has a high surface area of 1000 m2 g−1 and a high nitrogen content of 5.43%. The unique pore structure and nitrogen functionalities enable the carbon to exhibit a high capacitance of up to 290 F g−1 in 1 mol L−1 H2SO4 aqueous electrolytes.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 41
·21709-21714
·
IF 8.867
Ergui Luo,Meiling Xiao,Junjie Ge,Changpeng Liu,Wei Xing
Developing cost-effective and highly efficient oxygen reduction electrocatalysts, such as non-precious metal and metal-free catalysts, is undoubtedly crucial for the commercialization of low-temperature fuel cells. Here, edge-rich nitrogen doped porous carbon catalysts for the oxygen reduction reaction (ORR) with a high proportion of pyridinic and pyrrolic N (up to 94%) were synthesized by an in situ released CO2 activation method, using glucose and melamine as precursors and nano-CaCO3 as the template. The catalysts exhibit a three-dimensional structure, hierarchical pores and large pore volumes. Benefiting from the increased active site density and structural advantage, the optimized catalyst shows excellent ORR activity with a half-wave potential of 0.853 V and long-term stability in alkaline media, which is among the best for metal-free catalysts reported to date.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Xinyu Zhang,Jing Tian,Peipei Wang,Tian Liu,Mehraj Ahmad,Tingwei Zhang,Jiaqi Guo,Huining Xiao,Junlong Song
Biochar has very low adsorption capacity to anionic dyes due to negative charge on the surface. Herein, a dual-templating strategy by mild activators (K 2 C 2 O 4 ·H 2 O and CaCO 3 ) was applied for synthesis of soybean cake nitrogen self-doped biochar (NSB) to enhance the adsorption capacity for dyes. The results of element analysis showed NSB had N contents of 3.51%. Its specific surface area was 2413.00 m 2 g −1 and maximum adsorption amount of Rhodamine B and Congo Red reached up to 839.97 mg g −1 and 882.64 mg g −1 , respectively. The NSB retained high adsorption capacity after 5 cycles. By linear fitting of full Van't Hoff equation , lower enthalpy value shown in Congo Red adsorption in comparison with Rhodamine B adsorption, indicated the efficient anionic dye removal by NSB. Negative heat capacity change value indicated water molecules adsorbed on the NSB surface were replaced by dyes molecules. This paper provides a framework to prepare excellent NSB for the efficient removal of dyes from wastewater and shed lights on the mechanism of how NSB work for respective cationic and anionic dye from thermodynamics.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 32
·13619-13625
·
IF 3.288
Jingkun Xu,Junfeng Qu,Haibao Shao,Shuhong Xu,Chunlei Wang,Yiping Cui
Metal halide perovskites have proven to be reliable white light-emitting materials from a single component. Ordered metal halide perovskite arrays have drawn much attention because of their applications in lasing and displays. However, perovskite arrays capable of emitting white light are still underresearched. Herein, a C4N2H14PbxMn1−xBr4 perovskite ring array based on a feasible and simple 2D colloidal crystal template is reported. By optimizing the molar feed ratio (C4N2H14Br2/PbBr2/MnBr2 is 4/3/1), bright white emission has been achieved, which originates from both C4N2H14PbBr4 and the Mn dopant. The diameters of perovskite rings can be tuned continuously from 2.5 μm to 6.2 μm by simply preprocessing the template as confirmed by observing the changes in the contact area between the annealed template and the substrate as well as the drying process of the perovskite precursor. Compared with perovskite thin films without a template, the perovskite ring array has better stability in humid environments. By coating an ultraviolet light-emitting diode (LED) chip with a C4N2H14PbxMn1−xBr4 ring array film, we fabricated white LEDs which showed high color quality with CIE color coordinates of (0.32, 0.32), a color rendering index of 85, and a correlated color temperature of 5645 K.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Yaru Xi,Zuoyi Xiao,Hui Lv,Haodong Sun,Xuting Wang,Zhenyu Zhao,Shangru Zhai,Qingda An
Carbon-based electrode materials have received widespread interest in supercapacitors because of their tunable structure, high chemical and physical stability, and low cost. The hard template method is considered as a potential strategy for fabricating porous carbons with controllable structures. However, porous carbons with satisfactory capacitance are always fabricated using an expensive template. Therefore, a simple and low-cost template strategy is necessary to construct high specific capacity porous carbon for supercapacitors. Herein, we proposed a facile and cost-effective method to fabricate biomass-derived porous carbon with a controllable structure using alginate as precursor. The in-situ formation of Fe(OH) 3 nanoparticles was employed as a hard template to construct interconnect microchannels , which could effectively increase capacitive active sites and promote electrolyte diffusion during the electrochemical process . The optimized sample displayed a high specific capacitance of 302 F g −1 at a current density of 0.5 A g −1 in 6 M KOH electrolyte and outstanding cycling stability with the capacitance retention of 88.39 % after 10,000 cycles at 5 A g −1 . In addition, a symmetric supercapacitor assembled by Fe-SA-C-1.5 electrodes showed an energy density of 11.32 W h kg −1 at a power density of 250 W kg −1 . This work offers a promising approach to construct high-performance electrodes for supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuantao Li,Jiajun Zhu,Jiyang Xie,Yongyun Mao,Wanbiao Hu
Constructing three-dimensional (3D) hierarchical bimetallic pseudocapacitive materials with abundant opening channel and heterojunction structures is rather promising but still challenging for high-performance supercapacitors. Herein, a self-sacrifice-template epitaxial growth strategy was proposed for the first time to construct 3D hierarchical bimetallic pseudocapacitive material. By using this strategy, NiCo 2 O 4 nanowires (NiCo 2 O 4 NW) arrayed randomly to form a porous shell via in-situ epitaxial growth fully enclosing a MnO 2 tube core, forming multiple transport channels and nano-heterojunctions between MnO 2 and NiCo 2 O 4 NW, which facilitates electron transfer, i.e. exhibiting high electronic conductivity than any single component. As a result of the self-sacrifice-template epitaxial growth method, special hollow tectorum-like 3D hierarchical structure with considerable inter-nanowire space and hollow interior space enables easy access of electrolyte to NiCo 2 O 4 NW surface and MnO 2 core, thereby resulting in highly exposed redox active sites of MnO 2 core and NiCo 2 O 4 NW shell for energy storage. Comprehensive evaluations confirmed MnO 2 @NiCo 2 O 4 NW was a supercapacitor electrode candidate, delivering a superior energy density of 106.37 Wh kg −1 . Such performance can be ascribed to the synergistic coupling effect of 3D hierarchical tube and nano-heterojunction structures. The proposed self-sacrifice-template epitaxial growth strategy provides important guidance for designing high-performance energy storage materials.
研究领域:
材料科学
·
储能技术
·
纳米材料
✓ 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）