JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 41
·e54513
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IF 3
Boyu Cai,Qing Jiang,Wendi Xu,Luze Wang,Zhonglin Luo,Biaobing Wang
A nitrogen-rich DOPO-based phosphoramide (DPAPZ) was synthesized using aminopyrazine and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as raw materials, and blended with polycarbonate (PC) through melting method. The chemical structure of DPAPZ was validated by FTIR, 1 H NMR and 31 P NMR. The presence of DPAPZ endowed PC/DPAPZ composites with better fire safety and smoke suppression. With the incorporation of 6 wt% DPAPZ, PC/DPAPZ-6 composite reached UL-94 V-0 rating and 30.2% of limiting oxygen index value. Simultaneously, the peak of heat release rate and total heat release of PC/DPAPZ-6 were reduced by 44.8% and 47.0% as compared with the pure PC, respectively. The DPAPZ displayed bi-phase flame retardant roles. In the gas phase, the decomposition of DPAPZ released phosphorus-containing free radicals acting as the quencher of reactive H·/OH· and nonflammable NH 3 diluting O 2 /combustible volatiles. In the condensed phase, the phosphorus-containing components were dehydrated into metaphosphoric acid or polymetaphosphate covering the surface to protect the PC matrix from further combustion, and to promote the formation of a dense carbon layer to interrupt the transmission of O 2 and volatiles between the combustion zone and the inner. The tensile strength of the composites displayed almost no change but the elongation at break decreased slightly with the addition of DPAPZ.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Jian-Bo Chen,Taishan Yan,Chaofeng Wang,Ruixia Gao,Silong Xu,Guijuan Fan,Xueyan Zhao,Yu Liu
The dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50), as an outstanding representative of nitrogen-rich energetic salts, has recently attracted increasing interest due to its excellent performances. However, it is unclear about the photostability and degradation pathways of TKX-50 in aqueous solution. In this paper, the photostability and the degradation process of TKX-50 in aqueous solution have been comprehensively studied for the first time. TKX-50 can keep stable toward visible light. However, it presented a rapid degradation with rate constant of 0.0054 s −1 under 254-nm light irradiation. TKX-50 also demonstrated much faster photodegradation than traditional nitro explosives. Further, degradation products of TKX-50 were analyzed by high-resolution mass spectrum with theoretical calculations. The photodegradation pathways are proposed that 5,5′-bistetrazole-1,1′-diolate (BTO) anion of TKX-50 can been fragmented into the nitrile by losing N 2 and HNO, and then hydroxylammonium (NH 3 OH + ) from TKX-50 reacts with the nitrile through the nucleophilic addition. Besides as a solvent, water also may accelerate the photodegradation of TKX-50 probably by hydrolyzing the intermediary nitrile products. In a word, this study provides comprehensive understanding about the photostability of TKX-50 in aqueous solution, and it is helpful to study the photochemistry of other energetic ionic salts based on BTO.
研究领域:
化学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Dong Dong,Shujun Zhang,Weiwei Huo,Ming Zhao,Jun Li,Guohua Dong,Yingnan Zhao,Min Zhu,Zhichun Shi
Antibiotic contamination remains a challenge for wastewater treatment . In this work, a hyper-cross-linked polymer (DHCP-TP 3 ) with a dual nitrogen-rich structure was synthesized by a one-step facile Friedel-Crafts reaction, and a Fe 3 O 4 @DHCP-TP 3 composite was prepared by postmodification with the introduction of magnetic iron oxide nanoparticles (Fe 3 O 4 NPs), which were applied to the adsorption of tetracycline (TC) from aqueous solution. The TC adsorption capacities of the DHCP-TP 3 and Fe 3 O 4 @DHCP-TP 3 composites reached 519.65 and 893.85 mg·g −1 , respectively, and the adsorption processes for both followed the pseudo-second-order kinetic model and the Freundlich isothermal model. Fe 3 O 4 @DHCP-TP 3 can achieve adsorption equilibrium for TC within 200 min, and also exhibits excellent regeneration and magnetic separation capabilities. Complexation, hydrogen bonding, cation exchange and π-π interactions were the main adsorption mechanisms. Moreover, Fe 3 O 4 @DHCP-TP 3 could also adsorb other pollutants, including sulfadiazine (SD), sulfamethoxazole (SMZ), methyl orange (MO), methylene blue (MB), 2,4-dichlorophenol (2,4-DCP), and iodine (I 2 ). The brief synthesis, high adsorption capacity and easy regeneration certified that HCPs were ideal adsorbents for removing pollutants from wastewater.
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
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 48
·19180-19185
·
IF 3.069
Xiaoming Yang,Xinyu Lin,Yanna Wang,Lin Wang,Weijing Zhang,Zhimin Li,Tonglai Zhang
The nitrogen-rich structures 2,4,8,10-tetranitrobenzo [4′,5′][1,2,3]triazolo[2′,1′:2,3][1,2,3]triazolo[4,5-b]pyridin-6-ium-5-ide (7) and 2,4-diazido-8,10dinitrobenzo[4′,5′][1,2,3]triazolo [2′,1′:2,3][1,2,3]triazolo[4,5-b]pyridin-6-ium-5-ide (8) were designed, synthesized and characterized via IR spectroscopy, elemental analysis, differential scanning calorimetry (DSC) and single-crystal X-ray diffraction analysis. The decomposition temperatures of 7 and 8 were determined to be 366 °C and 181 °C, respectively. The detonation velocities and pressures of 7 and 8 were calculated using EXPLO 5 (V6.04) based on their experimental densities and calculated heats of formation, which were determined to be 7670 m s−1, 24.19 GPa for 7 and 7167 m s−1, 19.70 GPa for 8, respectively. The sensitivities towards impact and friction of 7 and 8 are 9 J, >360 N and 5 J, 240 N, respectively. Meanwhile, compound 8 possesses a higher nitrogen content (47.76%), moderate decomposition temperature and excellent positive heat of formation at 1053 kJ mol−1. This study suggests 7 is a potential thermally stable explosive and 8 is a nitrogen-rich high energetic material.
研究领域:
化学
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材料科学
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Tao Chen,Luzhao Xing,Shaojun Niu
Here, a novel magnetic nitrogen-rich biochar (MNRB), synthesized by attaching Fe 3 O 4 @SiO 2 -NH 2 particles with core-shell structure on crab shell derived/nitrogen-rich biochar (NRB), was used as absorbent and reductant to remove hexavalent chromium in aqueous systems. Characteristics of the material demonstrated that the MNRB was rich in nitrogen-containing functional groups and that the Fe 3 O 4 @SiO 2 -NH 2 magnetic particles with a diameter of approximately 150 nm were successfully added on the MNRB surface by strong ether linking (C-O-C). The maximum removal capacity of MNRB was 152.9 mg·g −1 , which was considerably higher than most reported magnetic biochar. Study of the removal mechanisms revealed that the Cr(VI) removal by MNRB involved three steps: (1) adsorption of Cr(VI) anions by protonated functional groups; (2) reduction of Cr(VI) anions to Cr(III) cations by electron-donor groups; and (3) chelation of Cr(III) cations by amine groups. The easy regeneration, satisfactory reusability, and remarkable performance in batch tests reflected the high potential of MNRB for treating Cr(VI)-contaminated water.
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
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2021
·
IF 3.196
Chenli Wei,Zeyu Guo,Yongjie Li,Jie Huang
A new nitrogen-rich energetic complex Cd(DMF) 2 BTZAF (1) (DMF= N,N-Dimethylformamide, H 2 BTZAF= 3, 3′-bis(1H-tetrazol-5-yl)-4, 4′-azofurazan) was first synthesized by the reaction of Cd(NO 3 ) 2 ·4H 2 O with 4-amino-3-(5-tetrazolate)-furazan. The compound 1 was characterized by elemental analysis and FT-IR spectrum analysis, respectively. The crystal structure of complex 1 was determined by single-crystal X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P2 1 /c. A Cd 2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, four nitrogen atoms are from the four BTZAF 2− ions and the other two oxygen atoms are from two DMF molecules. Moreover, the thermal decomposition behavior of compound 1 was studied with DSC and TG-DTG methods. The non-isothermal kinetic parameters of compound 1 was calculated by Kissinger's method and Ozawa-Doyle's method. In addition, the thermal safety performance and the impact sensitivity of complex 1 were measured and calculated, and the results showed that the synthetic compound has good insensitivity and stability.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2022
·Vol. 37
·期 4
·598-609
·
IF 2.613
Fatemeh Rahimi,Mansoor Anbia
The sensitive and reliable detection of Hg 2+ and CN − as harsh environmental contaminants are of great importance. In view of this, a novel ‘on–off–on’ fluorescent probe based on nitrogen-rich silicon quantum dots (NR-SiQDs) has been designed for sensitive detection of Hg 2+ and CN − ions in aqueous medium. NR-SiQDs were synthesized using a facile, one-step, and environment friendly procedure in the presence of 3-aminopropyl trimethoxysilane (APTMS) and ascorbic acid (AA) as precursors, with l -asparagine as a nitrogen source for surface modification. The NR-SiQDs exhibited strong fluorescence emission at 450 nm with 42.34% quantum yield, satisfactory salt tolerance, and superior photostability and pH stability. The fluorescence emission was effectively quenched using Hg 2+ (turn-off) due to the formation of a nonfluorescent stable NR-SiQDs/Hg 2+ complex, whereas after the addition of cyanide ions (CN − ), Hg 2+ ions could be leached from the surface of the NR-SiQDs and the fluorescence emission intensity of the quenched NR-SiQDs fully recovered (turn-on) due to the formation of highly stable [Hg(CN) 4 ] 2− species. After optimizing the response conditions, the obtained limits of detection were found to be 53 nM and 0.46 μM for Hg 2+ and CN − , respectively. Finally, the NR-SiQD-based fluorescence probe was utilized to detect Hg 2+ and CN − ions in water samples and satisfactory results were obtained, suggesting its potential application for environmental monitoring.
研究领域:
环境科学
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2018
·Vol. 135
·期 6
·3005-3013
·
IF 2.209
Luo Liqiong,Jin Bo,Peng Rufang,Shang Yu,Xiao Lipengcheng,Chu Shijin
A new nitrogen-rich energetic salt of bis-1-methylimidazole 1 H ,1′ H -5,5′-bistetrazole-1,1′-diolate salt, (1- M ) 2 BTO, was synthesized and characterized (FT-IR, 1 H NMR, 13 C NMR, elemental analysis, and X-ray single-crystal diffraction). Results indicated that (1- M ) 2 BTO crystallizes in the triclinic space group P -1. The thermal decomposition behavior of (1- M ) 2 BTO was determined by differential scanning calorimetry (DSC) and thermogravimetric tandem infrared spectroscopy. The decomposition peak temperature of (1- M ) 2 BTO was 530 K, which suggested that the salt is strong heat resistance. The apparent activation energies were 130.56 kJ mol −1 (Kissinger’s method) and 132.50 kJ mol −1 (Ozawa’s method), respectively. The enthalpy of formation for the salt was calculated as 917.3 kJ mol −1 . The detonation velocity and detonation pressure of (1- M ) 2 BTO were 7448 m s −1 and 20.7 GPa, respectively, using the Kamlet-Jacobs equation. Furthermore, the sensitivity test results showed that its impact sensitivity is greater than 50 J and friction sensitivity is 180 N, indicating that it has a lower sensitivity.
研究领域:
化学
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材料科学
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Slimane Abdous,Mehdi Derradji,Oussama Mehelli,Raouf Belgacemi,Sarah Soudjrari,Noureddine Ramdani,Karim Khiari,Mohamed El Amine Kadi,Wenbin Liu
In a vision to develop new synthetic routes for the preparation of energetic materials, two new energetic benzoxazine monomers were synthesized via a two-step Mannich reaction process involving the incorporation of nitrogen–nitrogen bonds and explosophore groups (NO2) into the monomer backbone. The molecular structures of the synthesized monomers were confirmed by 1H NMR, Fourier transform infrared and elemental analysis techniques. The curing behavior and the degradation phenomena were evaluated by differential scanning calorimetry-thermogravimetric analysis analyses. The two monomers showed two distinct exothermic peaks related to the polymerization and degradation phases. The energetic performances were evaluated by determining the heat of combustion and formation using a bomb calorimeter, in an oxygen atmosphere. The results indicated that the 2,4 dinitrophenylhydrazine–based benzoxazine has better energetic properties than the phenylsemicarbazide-based benzoxazine, and the two developed polymers showed comparable performances with nitrocellulose and glycid azide polymer. Overall, this study has demonstrated that the ease of synthesis of the benzoxazine resins via Mannich reaction can be further extended to the energetic field and further research is undergoing to fully unravel the potential of these exceptional materials.
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 60
·36287-36294
·
IF 3.119
Zhang Cong,Chen Xiang,Hu Yongpeng,Bai Yang,Guo Zhaoqi,Fan Daidi,Ma Haixia
Nitrogen-rich energetic materials (EMs) have been widely studied because of their high thermal stability, insensitivity, excellent detonation performance and non-toxic characteristics. In particular, these compounds are well applied as gas-generating agents (GGAs). As a nitrogen-rich heterocyclic framework, 1,2,4,5-tetrazine derivatives have shown great potential in the design of GGAs. The guanidine salts of 3,6-bis-nitroguanyl-1,2,4,5-tetrazine (DNGTz), guanidine (G2DNGTz) (1), aminoguanidine (AG2DNGTz) (2), diaminoguanidine (DAG2DNGTz) (3), and triaminoguanidine (TAG2DNGTz) (4) have been synthesized and characterized by elemental analysis and FT-IR. The crystal structures of 1 and 2 were obtained by X-ray single crystal diffraction. Crystal analysis shows that 1 and 2 arrange through zigzag-chain-like assembly and face-to-face geometries, which is helpful in decreasing mechanical sensitivity. The thermal stability and thermal decomposition kinetics of these four salts were studied by Differential Scanning Calorimetry (DSC). Furthermore, the thermogravimetry-Fourier transform infrared-mass spectrometry (TG-FTIR-MS) analysis of thermal decomposition products reveals that the main decomposition gaseous products are H2O, N2O, CO2, NO, N2 and NH3. Then, the cytotoxicity of the four salts was tested by MTT (3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide) method, and it was found that salts 1–4 show slight cytotoxicity in mouse fibroblasts (L929), at a concentration of 0.125 mg ml−1. The insensitivity, low toxicity, and production of clean gases without solid residue after burning of salt 1 indicate that it can be used as a potential green energetic material for GGAs.
研究领域:
化学
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材料科学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Chang-Yuan Cheng,Yong Xiang,Jing-Ping Sun,Wen-Cai Bai,Zhou-Xuan Zang,Ou-Yang Liu,Li Xu
In this study, we crafted nitrogen-laden microspheres known as PEI-GA, employing a straightforward, single-step synthesis at ambient temperature. We further validated their capacity as autonomous adsorbents, capable of achieving efficient, targeted, and swift extraction of gold ions (Au(III)) from aqueous media. The high nitrogen content of PEI, combined with its electrochemical adsorption ability, enables effective adsorption and reduction of Au(III) ions into gold nanoparticles, significantly enhancing the adsorption capacity and selectivity. PEI-GA exhibits an ultra-fast adsorption rate, achieving over 99 % Au(III) recovery in just 1 min at a concentration of 100 mg/L (m/V = 0.5 g/L). Moreover, even at higher concentrations (300 mg/L), the process only takes 5 min. The maximum adsorption capacity of PEI-GA reaches 2078 mg/g, following the Langmuir model and pseudo-second-order kinetics. PEI-GA also demonstrates excellent selectivity and recyclability, recovering over 95 % of gold ions from simulated e-waste solutions and maintaining 90 % recovery efficiency after five cycles. DFT calculations suggest that AuCl₄ − tends to form multicentric coordination with N atoms in PEI-GA. This study highlights the cost-effectiveness of PEI-GA for Au(III) recovery, which can be further optimized through calcination or regeneration.
研究领域:
环境科学
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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
ENERGY
·
2024
·
IF 9
Jia Liu,Shanjian Liu,An Zhao,Dongmei Bi,Mengqian Yin,Wenjing Zhao
Nitrogen-enriched pyrolysis strategies can effectively convert biomass into nitrogenous chemicals. However, the bio-oil fractions obtained from conventional one-step pyrolysis (OSP) are still complex, limiting their further upgrading and refining. Therefore, a stepwise nitrogen-enriched pyrolysis strategy was proposed in this study. The aim was to investigate the role of the stepwise process in regulating the enrichment of bio-oil fractions and the evolution of nitrogen forms in biochar obtained from nitrogen-rich pyrolysis of cellulose. The results indicated that selecting lower pyrolysis temperatures (T1 = 250 °C, 300 °C) in the first step (S1) of the stepwise nitrogen-enriched pyrolysis could effectively convert the furans and carbonyls such as esters derived from the cellulose into nitrogenous compounds. Thereby, the relative enrichment of nitrogen-containing compounds was achieved. Of these, O300–S1 was enriched with 84.13% nitrogenous compounds (mainly pyrroles and pyrazines). Elemental and XPS analyses revealed that stepwise pyrolysis was more favorable for N enrichment in biochar, and that stepwise pyrolysis at 300 °C was favorable for nitrogen atoms to dope in the carbon lattice. Finally, the possible migration pathways of NH 3 –N during pyrolysis were proposed. This study presents new insights into the high-value utilization of nitrogenous compounds obtained from lignocellulosic biomass.
研究领域:
能源与环境科学
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生物质转化
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）