JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Ying Liang,Meng Xia,Yuxiang Zhao,Dong Wang,Yongpeng Li,Zhuyin Sui,Juanxiu Xiao,Qi Chen
The development of functional covalent organic frameworks (COFs) with specific properties is an emerging research field. In the current work, COF-SQ-Ph was synthesized through the aza-Diels-Alder reaction between phenylacetylene and the matrix COF-SQ (triazine-based COF) generated from the organic monomers 2, 4, 6-tris(4-aminophenyl)-1, 3, 5-triazine and 2, 5-dimethoxyterephthalaldehyde in flask. The functionalized COF-SQ-Ph with an extended π-conjugated structure and enhanced structural stability was used as the sulfur loading recipient to prepare sulfur cathodes for lithium-sulfur batteries. Sulfur-impregnated COF-SQ-Ph marked as COF-SQ-Ph-S displayed better cycling stability with a specific capacity of 618 mA h g −1 after 150 cycles due to the lithiophilic interaction between lithium polysulfides and nitrogen atoms from quinoline and triazine moieties in COF-SQ-Ph-S. The functionalization of triazine-based COFs through a cycloaddition reaction in flask could promote the large-scale preparation of tailored COFs and the post-synthesis modification of COF-SQ.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 3
·1473-1481
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IF 2.961
Huang Xiaona,Ren Yaqi,Long Jianping,Lin Jinhui,Zhou Zheng
The interface between carbon matrix and sulfur (S) is critically essential for the exhaustive conversion of S to lithium sulfide (Li 2 S). However, the struggling diffusion of lithium (Li) ions on the surface of carbon allows severe polarization of Li ions and shuttling of polysulfides. Herein, we demonstrate an effective strategy via decreasing the diffusion barrier of Li ions on the conductive carbon matrix surface via embedding Fe and N atoms within the carbon matrix. As combined with 80% sulfur content, the proposed interfaces exhibit an excellent increment in both of specific capacity and stability cycles. The promoted mechanism at the proposed interface is clearly evaluated by density functional theory (DFT) calculation, cyclic voltammograms (CV) curve, and AC impedance. This research offers a novel inspires to design fast conversion of high content S cathode via promoting the Li-ion diffusion within the cathode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2018
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IF 2.906
Yiqi Wei,Yinglin Yan,Yiming Zou,Mangmang Shi,Qijiu Deng,Nana Zhao,Shiyu Chen,Jiaming Lin,Rong Yang,Yunhua Xu
Lithium-sulfur (Li-S) battery processes high theoretical capacity (1675 mA h g −1 ) and energy density (2600 Wh kg −1 ), which was widely accepted as one of the most promising candidates for energy storage devices. In this presented study, bamboo-derived hierarchical porous carbon (BDPC) was adopted as a conducting substrate for containing S. Soft polystyrene (PS) and polyaniline (PANI), were prepared as coating layers. The main purpose is to figure out the specific roles that the polymer shells and the heteroatoms doped on polymer backbone play during cycles. The ternary products were characterized by structural analysis and electrochemical testing. The results indicate that, as compared to BDPC/S, the PS@BDPC/S electrode displays higher capacity retention during long-term cycles, especially at the high current rate. It is attributed to the integrated coating shell, which provides physical confinement and reserves spaces for restraining volume expansion. It is noted that the PANI@BDPC/S electrode presents a higher initial capacity, remarkable long-life performance, and excellent rate property. The outstanding performances are closely related to the nitrogen atom doped on PANI backbone, they provide not just abundant polar conducting sites for fast electron/Li-ion transport but strong chemical anchoring for restricting the migration of polysulfides . Therefore, our study poses a clearer understanding of the functionalized polymers used in Li-S battery.
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
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Hong Li,Diyun Chen,Weixing Han,Jun He,Gang Song,Lingjun Kong,Minhua Su
Wastewater from uranium mining activities is highly acidic and contains uranium, thereby posing severe risks to the ecological environment and human health. Accordingly, uranium purification is extremely crucial. Herein, we delicately designed a novel adsorbent of diethylenetriaminepenta(methylenephosphonic) acid (DTPMP) and meso -SiO 2 modified γ-Fe 2 O 3 (γ-Fe 2 O 3 @SiO 2 @DTPMP, denoted as FSD), and found that the adsorbent can remarkably boost the removal performance of U(VI) under highly acidic conditions. The removal efficiencies of U(VI) by FSD are 90.26 % and 99.81 % in strong acidic solutions of pH = 1.0 and pH = 2.0, respectively, which are much higher than most of the reported adsorbents. Importantly, FSD exhibits high adsorption capacity (51.45 mg/g) and excellent anti-interference, even the wastewater stream contained a lot of organic substances ( e.g. , fulvic acid), cations ( e.g. , K + , Na + , Mg 2+ , NH 4 + , Zn 2+ , Co 2+ , etc.), radioactive nuclides ( e.g. , Cs + and Sr 2+ ). After five cycles, the adsorption efficiency and desorption efficiency of FSD only reduced by 8.83 % and 9.61 %, respectively, which are mainly attributed to the unique structures and good chemical stability of FSD. The removal of U(VI) by FSD is a heterogeneous adsorption process which is dominated by chemical adsorption, mainly involving surface coordination complexation. Multiwfn wavefunction and VMD programs based on density functional theory (DFT) further analyzed and visualized the interaction sites and relative strengths of reactions. The results of detailed characterization analysis and theoretical calculations confirmed that the highly efficient U(VI) removal by FSD is mainly ascribed to the strong coordination of the phosphate groups and amino nitrogen atoms in DTPMP with UO 2 2+ . Therefore, this study provides a promising strategy for the removal of U(VI) in strongly acidic wastewater.
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
JOURNAL OF POROUS MATERIALS
·
2023
·Vol. 30
·期 5
·1439-1448
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IF 2.6
He Yan,Guo Zhulei,Chen Mingfan,Wan Sicheng,Peng Nan,Fu Xiaolei,Yuan Dingzhong,Na Bing
In this paper, a new type of carbazole-based hyper-crosslinked porous polymer (HCP-CP) was prepared through a very simple “knitted” method. The obtained novel polymer HCP-CP has a good adsorption property of methyl orange (MO) and methylene blue (MB) organic dyes in aqueous solution due to its high surface area and rich nitrogen atoms. The effect of pH, adsorption time, different initial concentration of dyes and adsorption reusability were investigated in detailed. The optimum pH is 8 for the adsorption of MB and 6 for the adsorption of MO, respectively. Under the best condition, the Langmuir model fitted the adsorption isotherm well and the adsorption behavior follow pseudo-second-order kinetics. The maximum adsorption capacity of HCP-CP for cationic dye MB (q max =751.88 mg/g) is more than twice higher than that of anionic dye MO (q max =274.73 mg/g). These capacity differences may be owing to the stronger electrostatic interaction between the negatively charged nitrogen atoms of HCP-CP with the cationic dye MB than that of MO. Moreover, the used polymer HCP-CP still retain a removal percentage above 92% after 5 times adsorption-desorption recycle. Therefore, this work provided a convenient synthetic route to develop a novel hyper-crosslinked polymer with high adsorption capacity for the entrapment of dyes from aqueous solution.
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
COMPOSITES PART B-ENGINEERING
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2024
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IF 12.7
Shasha Wang,Yuli Wei,Rongzhe Wang,Qing Liu,Qing Wang,Shaohua Luo,Yahui Zhang,Shengxue Yan,Pengqing Hou,Xin Liu,Jing Guo,Wenning Mu
Nitrogen-doped carbon is regarded as a promising anode for potassium ion batteries (PIBs) because nitrogen atoms can regulate the structures of carbon and generate abundant active sites. How to improve the nitrogen content in carbon through simple and effective methods remains to be further addressed. In this paper, a carbon material (60NC) with ultrahigh nitrogen content (16 %) was prepared from graphite phase carbon nitride (g-C 3 N 4 ) by a convenient freeze-drying and high-temperature pyrolysis method, assisted by citric acid. When used as an anode for PIBs, 60NC exhibited a superior reversible capacity of 318.1 mAh g −1 after 200 cycles at 0.1 A g −1 . Even at the high current density of 1A g −1 , 60NC maintained a specific capacity of 261.8 mAh g −1 after 1000 cycles. The excellent electrochemical performance of 60NC mainly stems from its abundant K + storage active sites caused by nitrogen doping, large layer spacing, and hierarchical porous structure.
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
Catalysts
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2023
·Vol. 13
·期 6
·931
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IF 3.9
Junling Wei,Li Xu,Lihua Hu,Tiejun Wang,Yufei Ma
Hydrogen evolution reaction (HER) is a topic of great interest due to its efficient hydrogen production properties, which can address the increasing demand for clean and sustainable energy sources. On the other hand, molybdenum carbide (MoC) has been widely studied due to its noble metal-like surface electronic properties. In the HER process, it is crucial to regulate the Mo−H bonding energy effectively and increase the electron transfer rate on the MoC catalyst surface in a rational manner. In this study, we introduce highly electronegative nitrogen and non-noble transition metal atoms (Cu or Co) into the molybdenum carbide crystal lattice (N−M−MoC, M: Cu, or Co), which leads to a dual—doping effect. This effect results in the rearrangement of the electronic configuration on the catalyst surface and the enrichment of electrons around Mo atom, leading to an optimization in the Mo−H bonding energy. Moreover, the unique two-dimensional nano-sheet structure of the N−M−MoC materials further promotes the electron transfer and exposure of active sites. Benefiting from the above, the HER performance of the N−M−MoC is significantly improved. Among them, N−Cu−MoC exhibits the lowest overpotential (η10= 158 mV) and highest stability (about 30 h) in alkaline solutions.Keywords:dual-doping;heteroatoms;molybdenum carbide;hydrogen evolution reaction;surface electronic structure
研究领域:
材料科学
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催化化学
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能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2018
·Vol. 41
·期 10
·2110-2118
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IF 2.415
Wenjie Zhao,Xuhua Lou,Jizhao Guo,Peijian Sun,Yunzhen Jia,Limei Zheng,Lijun He,Shusheng Zhang
Two reversed-phase/anion-exchange mixed-mode stationary phases for high-performance liquid chromatography using calixtriazines as chromatographic ligands were investigated with Tanaka test solutes, monosubstituted benzenes, aromatic positional isomers, and inorganic anions. Calixtriazine as a chromatographic ligand has been reported previously, but the benzylated nitrogen-bridged calixtriazine-bonded silica gel reported in this study is new. The experimental data showed that the calixtriazine platform is a unique chromatographic selector because its multiple active sites are available for different solutes and its chromatographic selectivity could be tuned by introducing substituent on the bridging nitrogen atoms present in the calixtriazine matrix. The synergistic effects of aromatic rings, nitrogen atoms, benzyl groups, and tunable cavity in the host molecule influenced the separation selectivity by multiple retention mechanisms. Such hybrid stationary phases provide more versatility and have great potential in the analysis of complex samples. Moreover, the synthetic protocols presented herein may provide an alternative understanding on macrocyclic host–guest chemistry, leading to new and selective separation media.
研究领域:
分析化学
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色谱技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2022
·
IF 6.796
Jiacheng Zhou,Hao Zhang,Tianying Xie,Ye Liu,Qicheng Shen,Jie Yang,Limei Cao,Ji Yang
The stronger coordination ability of mercury ions with organic ligands than the metal ions in metal organic framework (MOFs) provides an accessible way to separate mercury ions from solution using specific MOFs. In this study, a Co-based MOF (ZIF-67, Co(mIM) 2 ) was synthesized. It did not introduce specific functional groups, such as -SH and -NH 2 , into its structure through complicated steps. It separate Hg 2+ from wastewater with a new strategy, which utilized the stronger coordination ability of Hg 2+ with the nitrogen atom on the imidazole ring of the organic ligand than the Co 2+ ions. Hg 2+ replaced Co 2+ nodes from ZIF-67 and formed a more stable precipitate with mIM. The experimental results showed that this new strategy was efficient. ZIF-67 exhibited Hg 2+ adsorption capacity of 1740 mg/g, much higher than the known MOFs sorbents . mIMs is the reaction center and ZIF-67 can improve its utilization. The sample color faded from purple to white due to the loss of cobalt ion. It is a great feature of ZIF-67 that allows users to judge whether the sorbent is deactivated intuitively. ZIF-67 can be sustainable recycled by adding organic ligands to the solution after treatment due to its simple synthesis method at room temperature. It's a high-efficient and sustainable sorbent for Hg 2+ separation from wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2018
·
IF 4.513
Bin Xie,Yingjie Xu,Xiaochen Tang,Hegang Shu,Tingting Chen,Xiao Zhu
The design of acidity and alkalinity is an important characteristic of ionic liquids , and it also affects their application. For this reason, the alkalinity of six hydroxypyridine anion-based protic ionic liquids (PILs) was determined by potentiometric titration , and the effect of the type of cation and the position of nitrogen atom of anion on the alkalinity was discussed. Furthermore, six hydroxypyridine anion-based PILs were used as catalysts for Knoevenagel reaction , and the relationship between the catalytic performance and the alkalinity was investigated. The results indicate that the type of cation has little effect on the alkalinity of the studied PILs, while the position of nitrogen atom of anion has a significant influence on the alkalinity, and the order of the alkalinity is as follows: [2‑Op] − > [4‑Op] − > [3‑Op] − , resulting from the positive cooperative interaction between electronegative nitrogen and oxygen atoms, which is confirmed by DFT calculation . Consequently, the PILs with [2‑Op] − anion showing stronger alkalinity exhibits better catalytic performance for Knoevenagel reaction.
研究领域:
化学
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2018
·
IF 3.849
Xuemei Li,Gang Chen,Qiong Jia
Abatract The primary challenge in environmental remediation is keeping the balance between performance and economy for practical application. The usage of hypercrosslinked polymers as iodine capture adsorbents overcomes the shortcomings of commonly used porous organic polymers adsorbents including the usage of expensive catalysts or monomers and complicated synthesis procedures. This issue is the first attempt to prepare polyethylenimine impregnated hypercrosslinked polymers with a high density of nitrogen atoms designed for iodine capture. The resulting polymers exhibited ultrahigh iodine uptake capacities up to 607 wt% and the capture process fitted the pseudo-second-order model well. Porous characteristics, electron-rich aromatic networks, and abundance nitrogen atoms in polyethylenimine contributed to the high capture capacity. Results indicated that the interactions between iodine and adsorbents were charge transfer and the form of captured iodine was polyiodide. Furthermore, the polymers could be recycled with 93.4% iodine uptake capacity maintained after four cycles. The work presented a new benchmark for using hypercrosslinked polymers as economical materials for iodine capture.
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
DESALINATION
·
2022
·
IF 11.211
Jia-Li Zhao,Meng-Long Zhang,Zhi-Kai Zhang,Cheng Ma,Zhong-Yan Cao,Shao-Fei Ni,Ying Xu
Two new yet structurally similar scale inhibitors (PASP-AAB and PASP-AAA), have been successfully synthesized through ring-opening reaction of polysuccinimide (PSI) with inexpensive (4-[(2-aminoethyl) amino]-4-oxobutanoic acid or glycylglycine. Static antiscaling experiments imply they could dramatically improve the antiscaling efficiency of gypsum, better than that of PASP. Moreover, the slightly different nitrogen atom position on the side chain of PASP-AAB and PASP-AAA enables the former efficiently inhibit the gypsum scale at low concentration (2.0 mg/L). In addition, our results indicate the antiscaling performance of PASP-AAB (at 4.0 mg/L) could maintain the excellent efficiency (>99 %) against gypsum for at least 7 days, better than that of some reported polymer-, and phosphorus-based industrial antiscalants. The very efficient gypsum scale inhibition property of PASP-AAB makes it as one of the very effective green antiscalants reported in the literature by now. Detailed mechanism studies reveal that the better calcium scale inhibition performance of PASP-AAB should be attributed to the easier formation of seven-membered chelation ring of side chain with Ca 2+ . The unprecedented nitrogen substitution effect disclosed in this work provides a new perspective for understanding the structure-activity relationship of the grafting-modified polymeric inhibitor, meaningful for developing other novel green scale inhibitors.
研究领域:
材料化学
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环境科学
✓ 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）