CARBOHYDRATE POLYMERS
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2018
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IF 5.158
Jie Zhou,Hui Wang,Wei Yang,Shengji Wu,Wei Han
Chitosan has high synthetic flexibility, making it a promising nitrogenous bioresource for industrial applications. Nitrogen-rich hierarchically porous carbon (NHPC) was successfully synthesized by hydrothermal carbonization and self-activation of a chitosan-transition metal ion (Zn 2+ ) complex. The N 2 adsorption-desorption isotherm revealed that the as-made NHPC had large specific surface area (1067 m 2 g −1 ) and a unique hierarchical pore structure (0.6–6.4 nm). Scanning electron microscopy (SEM) indicated a 3D finely interconnected nest architecture for NHPC. X-ray photoelectron spectroscopy (XPS) analysis demonstrated that the nitrogen atoms in the chitosan were protected by coordination with zinc ions , and most of them were still retained in the carbon matrix (6.36 at%) after high temperature activation. Electrochemical measurements exhibited that NHPC delivers a high specific capacitance (228.7 Fg −1 at 1 A g −1 ), impressive rate capability (the specific capacitance at 20 A g −1 was 174 Fg −1 , maintaining 74.6% of the initial capacitance at 0.5 A g -1 ), and outstanding long-term cycling stability (98.3% retention after 5000 cycles), together with excellent energy density of 25.7 Wh kg -1 at the power density of 500 W kg -1 . This study offers a novel strategy for synthesizing NHPC as one of the desirable electrode material candidates for energy storage.
研究领域:
材料科学
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能源存储
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化学工程
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2019
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IF 5.383
Danping Li,Xun-an Ning,Yue Huang,Shengchuan Li
Novel two-dimensional carbon nitride hexagonal-like sheets were fabricated from thermal condensation , which uses hexaazatriphenylene-based precursor prepared microporous and oxidation resistant carbons materials (HAT-CN). The results show that the as-prepared HAT-CN is the first electrode utilized in capacitive deionization, due to the rich heteroatom and border-group content, as well as the potential collaborative effect of C and N atoms, displaying the quick ion diffusion and strong charge transfer performance. Additionally, the capacitive deionization performance of HAT-CN is improved by the synergistic contribution of a large accessible surface area, large pore volume, and high graphitization. The electrode of HAT-CN was carbonized at 550 °C which display an excellent specific capacitance of 179.2 F g −1 in 1-M NaCl solution at a scan rate of 5 mV s −1 . Subsequently, a high salt adsorption capacity of 24.66 mg g −1 was attained for an applied voltage of 1.2 V in 500 mg L −1 NaCl solution, showing good cyclic stability at 30 cycles. Considering those excellent properties of the prepared HAT-CN, the capacitive deionization electrode should be an ideal candidate for high-performance deionization application.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2022
·Vol. 10
·期 20
·11268-11276
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IF 14.511
Jiabao Guo,Yizhuo Zhao,Peng Wang,Yang Song,Yifei Shao,Li Zhu,Xiaoquan Yao
Catalytic selective cleavage reaction of the C(sp3)–C(sp3) bond has received little attention, despite its importance in organic synthesis and biochemistry. Herein, a novel copper loaded nitrogen-rich mesoporous carbon nitride material was designed and synthesized, and utilized as a highly efficient photocatalyst for the inert C–C bond cleavage of amines under blue light irradiation. With oxygen as a benign oxidant, good to excellent yields were achieved for various functionalized amines at room temperature, even including sluggish aliphatic amines. The method may provide a cost-effective and environmentally friendly alternative for the direct oxidative cleavage of amines.
研究领域:
有机合成
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光催化化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2024
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IF 3.8
Qidong Yu,Wenmin Zhang,Jingyi Wang,Shiye Xie,Baodi Liao,Hui Chen,Qingqing Ding,Lan Zhang
Design and preparation of fiber coatings with excellent electrochemical performance and high polarity is significant for efficient extraction of polar targets in electro-enhanced solid-phase microextraction (EE-SPME). In this work, a combination strategy for structure regulation of covalent organic framework (COF) was proposed to fabricate a nitrogen-rich thiocarbamide linked COF coating (Thiocarbamide-TZ-DHTP) via molecular design and post-synthetic thiocarbamide conversion. The prepared COF coating possesses a large number of O, N, and S functional groups, which not only endow the coating with higher polarity but also significantly enhance its electrochemical performance. The COF coating was used for EE-SPME of polar bisphenols (BPs), demonstrating excellent enrichment efficiency and durability. Subsequently, coupled with gas chromatography-tandem mass spectrometry (GC-MS/MS), a sensitive method was developed for determination of trace BPs. The established method possess wide linear ranges (2.0–800.0 ng L −1 ), good correlation coefficients (0.9985–0.9994) and low detection limits (0.1–2.0 ng L −1 ). Moreover, the established method had been successfully applied to detection of trace BPs in tea beverage with satisfactory recoveries (81.6 % to 118.6 %). This research provides a feasible pathway for preparing COF coating with excellent electrochemical performance and high polarity for EE-SPME.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
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2024
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IF 4.3
Jiaxin Hu,Juan Zhang,Jinming Chang,Yunwen Liao,Hejun Gao,Hongquan Fu
Photocatalytic reduction of uranium from U(VI) to U(IV) has been recognized as an effective treatment method for uranium wastewater. However, most photocatalysts have to be reduced under inert gas and sacrificial agent. Here, a class of nitrogen-rich core–shell photocatalysts (CdS@MC) with high stability was successfully prepared by modifying CdS with melamine and cyanuric chloride condensation. When the initial concentration of U(VI) was 100 mg/L and the solid–liquid ratio was 0.2 g/L, the removal of U(VI) by CdS@MC without sacrificial agent under air could reached 95%. The removal rate was still above 80% after five cycles with good stability and good removal rate of U(VI) at high salt concentration. CdS@MC not only efficiently generates electrons for photocatalytic reduction of U(VI), but also generates H2O2 from O2, which then reacts with uranyl ions to produce metastudtite. This study provides a new direction for the study of efficient uranium removal photocatalysts without sacrificial agent in air environment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Hong-Kun Yang,Yang Yu,Zi-Hao Zhao,Hui-Ying Zhang,Yi-Ming Zhang,Jun Chen,Lingyan Wang,Yuan-Chun He
Coordination polymers (CPs) are a kind of inorganic-organic hybrid materials that have received increasing attention recently due to their high porosity, stability, and modifiability. In this work, we have successfully synthesized a new CP based on a N-rich ligand (4,5-di(1 H -tetrazol-5-yl)-2 H -1,2,3-triazole) under hydrothermal condition. The crystal structure was determined by single-crystal X-ray diffraction. Compound 1 displays a three-dimensional supramolecular structure constructed from the two-dimensional layers, and has been further characterized by powder X-ray diffraction, elemental analysis , infrared spectrum, and thermogravimetric analysis . The electrochemical properties of compound 1 have been studied in detail. The detection performance of compound 1 modified electrodes was determined. The results reveal that compound 1 can be successfully applied as an electrode material to simultaneously detect two heavy-metal ions Cd 2+ and Pb 2+ with high sensitivity and selectivity. Moreover, compound 1 reveals excellent reversible capacity, cycle stability, and rate performance as an anode material for lithium-ion battery.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
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IF 9
Jinjiao Pan,Yue Ma,Huazhen Rong,Yilei Zhang,Yu Guo,Chuan Gan,Lu Liu,Yihui Yuan,Ning Wang
Iodine pollution in water, especially from radioactive sources, represents a significant environmental challenge. Conventional water treatment methods often fail to efficiently remove iodine pollutants, particularly those present in low concentrations. In this study, an ionic nitrogen-rich porous organic polymer (NPOP-TIPA) was synthesized by engineering ionic sites into a nitrogen-rich porous organic polymer, to enhance the removal of multiple iodine pollutants from aqueous solutions. This synergistic design strategy improved NPOP-TIPA’s affinity for multiple iodine pollutants, including molecular iodine (I 2 ), iodide (I − and I 3 − ). Experimental results revealed that NPOP-TIPA exhibited excellent iodine removal efficiency and excellent reusability. Additionally, NPOP-TIPA effectively reduced iodine concentrations from an initial 5 ppm to below 20 ppb, demonstrating its practical applicability under real-world conditions. This study highlights the potential of ionic nitrogen-rich materials in improving multiple trace iodine pollutants removal and provides new perspectives on the design of advanced materials for water purification.
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
THERMOCHIMICA ACTA
·
2017
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IF 2.236
Mei Wang,Xianghai Song,Jianchun Jiang,Jianling Xia,Shouhai Li,Mei Li
Hydroxyl and nitrogen rich groups-containing tung-oil-based Ca/Zn (Ca-HTMA-1, Zn-HTMA-1, Ca-HTMA-2 and Zn-HTMA-2) and polyol thermal stabilizers (HTMA-1 and HTMA-2) were successfully synthesized from tung-maleic anhydride (TMA). The thermal stability tests show that CaSt 2 /Zn-HTMA-2/HTMA-2 displays the best thermal stability for poly(vinyl chloride) (PVC). The superior performance is attributed to the synergistic effect of CaSt 2 , Zn-HTMA-2 and HTMA-2, which is originated from the simultaneous introduction of hydroxyl and nitrogen rich groups into the Zn-HTMA-2 and HTMA-2 structures. The nitrogen rich groups can absorb the hydrogen chloride released during the PVC degradation process, which helps to inhibit the “autocatalytic effect” and lead to better long term thermal stability. Besides, hydroxyl groups can form stable chelates with ZnCl 2 to avoid “zinc-burning” during the later PVC degradation. Besides the better stabilization performance, CaSt 2 /Zn-HTMA-2/HTMA-2 also displays comparable plasticization performance for PVC compared with other stabilizers. A possible stabilizing mechanism of PVC/CaSt 2 /Zn-HTMA-2/HTMA-2 system was presented.
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
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Saqlain Raza,Amin Abid,Isham Areej,Shahid Nazeer,Ahmad Kaleem Qureshi,Bien Tan
In this research, two types of metal-free organic–inorganic phosphazene based hybrid porous polymers (HPMs) enriched with phosphorus (P) and nitrogen (N) for gas sorption characteristics were reported. Cyclic phosphazenes were synthesized by condensation of biphenyl methanol with the hexachlorocyclophosphazenes (HCCPs) followed by cross-linking for the fabrication of porous and high surface area moiety designated as HCP-1. Whereas HCP-2 was synthesized with the replacement of polydichlorophosphazene (PDCP) chlorines with biphenyl methanol and later cross-linked in the same manner. Brunauer–Emmett–Teller surface areas of (SABETs) of HCP-1 and HCP-2 were 482 and 323 m2 g–1, respectively, whereas pore size distribution was under 1.10 nm. The observation of a higher surface area of HCP-1 is strongly indicative of cyclic N and P long chain backbone [-N═P-]. HCP-1 with a high surface area represented high carbon dioxide (CO2) adsorption (1.656 mmol g–1 with quantity adsorbed 37.13 cm3 g–1 at 273 K/1 bar and 1.35 mmol g–1 with quantity adsorbed 30.37 cm3 g–1 at 298 K/1 bar). HCP-2 with a low surface area showed moderate adsorption capacity (1.6 mmol g–1 with a quantity adsorbed 35.82 cm3 g–1 at 273 K/1 bar and 1.26 mmol g–1 with a quantity adsorbed 28.36 cm3 g–1 at 298 K/1 bar). The values of iodine uptake of HCP-1 and HCP-2 are 148 and 227 wt %, respectively, at 353 K. These results indicate a facile and convenient method to synthesize heteroatom-rich metal-free organic–inorganic phosphazene based hybrid porous polymers for CO2 and I2 sorption applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Wen-Jun Lu,Ying-Yi Zhao,Bai-Wang Sun
Radioactive iodine is a high proportion of the fission product of nuclear power, and it is crucial to fabricate materials for capturing iodine from both vapor and solution media. The large-scale synthesis of materials in low-temperature deoxidation and high-temperature with long-time environments presented significant challenges. The Chichibabin pyridine coupling reaction was employed to design and synthesize a nonporous piperazine-linked COP (PIPCOP) under atmospheric pressure within a short reaction time of only 2 h. The PIPCOP material had a comparatively low BET surface area measurement of 4.28 m 2 g −1 with an exceptionally low pore volume of 0.0083 cm 3 g −1 . However, it had a high ability to accept iodine vapor and iodine in hexane, with a capacity of 5.18 g g −1 and 1.95 g g −1 , respectively. A novel proposal is presented in this study for the synthesis of functional nonporous polymers with enhanced iodine absorption capacity, aiming to address environmental concerns.
研究领域:
材料科学
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环境科学
·
核能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Hao Jing,Zhao Liu,Jun Chen,Chun Loong Ho
Microbial-based iron reduction is an emerging technology used as an alternative to conventional chemical-based iron reduction. The iron reduction in kaolin refinement is vital for enhancing its commercial value. Extensive studies on microbial-based iron reduction mainly focus on Gram-negative bacteria, whereas little is understood about Gram-positive bacteria’s mechanism and potential application. This study aims to investigate the iron-reducing mechanism of two Gram-positive bacterial isolates, Bacillus cereus (B. cereus) and Staphylococcus aureus (S. aureus). By varying the growth environment of bacteria and monitoring the biochemical changes during the process of iron reduction, the results show that Gram-positive bacterial iron reduction performance depends on the medium composition, differing from Gram-negative bacteria-based reduction processes. Nitrogen-rich medium facilitates the microbial basification of the medium, where the alkaline conditions impact the microbial iron reduction process by altering the gene expression involved in intracellular pH homeostasis and microbial growth. This discovery will contribute to the mineral refining processes and promote the development of microbial-based bioprocesses for ore purification, while also laying the foundation for investigating other Gram-positive bacterial iron-reducing ability.
研究领域:
环境微生物学
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生物技术
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矿物加工
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）