INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Chengyi Dai,Xuemei Li,Menghan Zhang,Yi Cui,Binran Zhao,Xiaoxun Ma
Ammonia is a potential hydrogen carrier and can be used as an alternative fuel . In this study, plasma cooperative catalytic synthesis ammonia was used. The catalyst consisted of Ni impregnated into silica , using one of three complexing agents (TEPA, EDTA and GLY) and compared with conventional impregnation methods. The unsaturated coordinated Ni(tepa) 2+ will coordinate with the hydroxyl groups on the silica surface. When using the catalyst prepared by TEPA , the ammonia synthesis rate was 3.8 times higher than with no catalyst, and 1.4 times higher than the catalyst made by conventional impregnation method. XRD and TEM show that the catalyst prepared using TEPA exhibited the smaller metal particle size, the higher dispersion and the stronger interaction between metal and support than other catalysts. XPS indicate that the good metal dispersion of the catalyst facilitate form more Ni 3 N during the reaction, which will greatly improve the activity of the catalyst.
研究领域:
催化化学
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材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Liu Yang,Ning Ma,Zhenchang Fang,Kaijia Jiang,Xinling Li,Zhen Huang
The low capture loading is one of the main issues in developing the physical solvent biphasic absorbent. To address this issue, a small amount of polyamine TEPA was introduced as an activator into the DMAPA-Sulfolane-H 2 O (DSH) solution, aiming to design a novel diamine-based physical solvent biphasic absorbent DSH-TEPA for efficient CO 2 capture from flue gas in this study. The enhancement of TEPA on the phase separation and the capture performance was illustrated by experiments and molecular simulations. Experimental results revealed that DSH-0.20 M TEPA presented excellent enhancement performance for CO 2 capture: increased by 18.6 % of the absorption loading, 19.4 % of the rich phase loading, 7.8 % of the amine availability, 12.3 % of the overall mass transfer coefficient, 17.5 % of the desorption loading when comparing with DSH. In addition, DSH-0.2 M TEPA could achieve regeneration energy as low as 2.045 GJ/t CO 2 , which was 42.8 % lower than 30 wt% MEA, and lower than most of the reported physical solvent biphasic absorbents. For the application test, an increase in the CO 2 concentration in the flue gas could effectively increase the absorption rate and loading while there was an optimal gas flow rate for a certain CO 2 concentration to obtain higher capture performance. The enhancement mechanism of TEPA was analyzed elaborately by 13 C NMR characterization and quantum chemistry calculations and 134 possible types of TEPA-derived products were depicted according to the unique structure of TEPA. The higher polarity of TEPA-derived products and the stronger hydrogen bonds between TEPA-derived products and H 2 O confirmed the TEPA role as not only an excellent capture loading activator but also an effective phase separation accelerator.
研究领域:
化学工程
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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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Baoqiang Wang,Xiaochun Chen,Guangren Yu
A new class of biphasic system composed of tetraethylene pentaamine (TEPA), organic solvents and water is developed for capturing CO 2 , among which TEPA/Diethyleneglycolmonomethylether (DGME)/Water shows the best performance. When the TEPA/DGME/Water with mass ratio 3:3:4 is at 25 °C and atmospheric pressure, CO 2 absorption capacity reaches 1.89 mol CO 2 /mol amine (2.99 mol CO 2 /kg) after 50 mins, in which CO 2 rich phase accounts for 73%. The CO 2 desorption efficiency reaches about 97% at 130 °C and the CO 2 desorption energy consumption is 53.2%, 27.4% and 3% lower than that of MEA, TEEA/DEEA/Water and 0.5D1.5A3P respectively. The CO 2 cycle capacity is approximately 60% higher than that of traditional monoethanolamine (MEA)/1-propanol/Water biphasic absorbent. Compared with previously reported biphasic system, even with similar absorbent masses, the absorption equilibrium time is significantly shortened with competitive absorption capacity. This is a class of promising absorbent for capturing CO 2 .
研究领域:
化学工程
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环境科学
·
能源技术
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Zhi Hu,Jiahong Wang,Tongtong Sun
A novel tetraethylenepentamine (TEPA) functionalized magnetic mesoporous silica adsorbent (FNMs/TEPA) was prepared for adsorption of Cr(III)-EDTA from wastewater. Characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon (FNMs), while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties. The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(III)-EDTA. FNMs/TEPA exhibited an excellent adsorption property (13.84 mg∙g –1 ) at pH 4.0. Even in the existence of high concentrations of coexisting ions and organic acids, the adsorption performance of FNMs/TEPA was stable. Experimental characterization and density functional theory (DFT) demonstrated that the adsorption of Cr(III)-EDTA was ascribed to the electrostatic interaction, hydrogen bonding, and complexation between Cr(III)-EDTA and amino groups on the adsorbent surface. The analysis of the Independent Gradient Model (IGMH) shown that electrostatic interaction is the main mode of action in the adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles. These findings indicated that FNMs/TEPA possessed excellent application prospect in the disposal of wastewater containing Cr(III)-EDTA.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Weiran Mao,Junlin He,Zhiyong Tang,Chengli Zhang,Jun Chen,Jia Li,Chao Yu
A novel electrochemical immunosensor was proposed for the detection of monocyte chemoattractant protein-1 (MCP-1), a biomarker of cardiovascular disease. Due to thionine (Thi) possessing electroactive redox properties, a one-step approach was utilized to synthesize a reduced graphene oxide-tetraethylene-thionine-Au (rGO-TEPA-Thi-Au) nanocomposite at room temperature using the synergistic effect of Thi and rGO-TEPA towards HAuCl 4 . We obtained the excellent matrix material , which immobilized more primary antibody MCP-1-Ab 1 on rGO-TEPA on a modified glassy carbon electrode (GCE). To further enhance the sensitivity of the sensor, a novel signal generation and amplification strategy was developed for detection. RuPdPt trimetallic nanoalloy particles (RuPdPt TNPs), a novel nanomaterial , were synthesized by a one-pot method, displayed a uniform morphology as well as good electrochemical activity and bound with the secondary antibodies against MCP-1 via the Pt-NH 2 bond. Most importantly, RuPdPt TNPs have a significant ability to catalyze H 2 O 2 to produce an electron. The electrochemical signal was highly amplified because the electrochemical signal was primarily derived from the synergistic catalysis of H 2 O 2 by RuPdPt TNPs and recorded by chronoamperometry . Under the optimal conditions, this newly designed biosensor exhibited sensitive detection of MCP-1 in the range from 20 fg mL −1 to 1000 pg mL −1 , with a detection limit of 8.9 fg mL −1 (based on a S/N = 3). Additionally, the designed immunosensor showed acceptable selectivity , reproducibility and stability. This immunosensor is a promising strategy for analyzing clinical serum samples in the future.
研究领域:
生物化学
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纳米技术
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电化学
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生物传感器
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医学诊断
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产品关联
DOI
PubMed
高影响因子
International Journal of Greenhouse Gas Control
·
2015
·
IF 3.946
Xia Wang,Qingjie Guo,Jun Zhao,Linlin Chen
A CO 2 sorbent was prepared by immobilizing a mixture of tetraethylenepentamine (TEPA) and 2-amino-2-methyl- l -propanol (AMP) onto MCM-41. The prepared composites were characterized by N 2 adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA) techniques. CO 2 adsorption–desorption experiments were conducted in a self-assembled fixed bed reactor under the simulated flue gas component of 15 vol.% CO 2 /85 vol.% N 2 . The promoting effects of AMP on the adsorption performance and amine efficiency of TEPA modified MCM-41 were studied. In addition, the effects of the adsorption temperature and the feed flow rate on the CO 2 adsorption process were investigated. Further, the regenerability of the sorbent was studied by performing fifteen adsorption–desorption cycles over the temperature range of 70 °C (adsorption) to 100 °C (desorption). Among the prepared sorbents, MCM-41 modified with 30 wt.% TEPA and 30 wt.% AMP (MCM-41-TEPA30%-AMP30%) showed rapid adsorption kinetics and the maximum CO 2 adsorption capacity of 3.01 mmol-CO 2 /g-sorbent at 70 °C. Moreover, the MCM-41-TEPA30%-AMP30% sorbent exhibited good regenerability and thermal stability. The results demonstrate that the MCM-41-TEPA30%-AMP30% sorbent is a promising CO 2 sorbent.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2024
·
IF 1
Xuecong Ma,Linlin Geng,Yu Li,Jianwen Wei,Lei Liao,Dunqiu Wang
Micro/mesoporous materials are low-cost functional materials with the potential for CO 2 adsorption. Modifying micro/mesoporous materials is significant for enhancing CO 2 adsorption and their high-value utilization. Herein, the micro/mesoporous material of composite molecular sieve ZSM-5/MCM-48 (ZM) was synthesized by a two-step crystallization method using cetyltrimethylammonium bromide as a template, tetraethyl orthosilicate as a silicon source and ZSM-5 seed as part of silicon aluminum source. Tetraethylenepentamine (TEPA) and polyethyleneimine (PEI) were used as impregnation modifiers to modify ZM with amine groups. The results showed that with the increase of amine loadings, both ZM-T60 (Impregnated with TEPA) and ZM-P60 (Impregnated with PEI) functionalized adsorbents exhibited the best adsorption capacities of 4 . 9 7 mmol ⋅ g − 1 and 3 . 2 8 mmol ⋅ g − 1 at 60, respectively, when the loading of ZM sample was 60%. The adsorption kinetic analysis showed that the adsorption of CO 2 by ZM-T60 and ZM-P60 was a chemisorption-dominated process accompanied by physical adsorption. After 10 adsorption/desorption cycles, the CO 2 adsorption capacity of ZM-T60 and ZM-P60 decreased by 8.7% and 2.6%, respectively. This work demonstrates that impregnation modification of the composite molecular sieve to achieve efficient CO 2 adsorption has practical application significance.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Da Li,Qifeng Kuang,Xiaoling Men,Bo Zhang,Jianqi Huang,Xiaolei Shang,Bing Yang,Teng Yang,Zhiwei Li,Zhidong Zhang
Composition/structure-dependent superconductivity for FeSe-based superconductors attracted great attention not only due to their high superconducting transition temperatures ( T C ), but also for understanding the origin of iron-based superconductivity. Here, we report a new Fe-poor organic-inorganic hybrid material Fe 14 Se 16 (tepa) 0.8 with a paramagnetic-diamagnetic transition at ∼42 K grown by a high-temperature organic-solution-phase method with soluble iron/selenium sources in a tepa solution, alternative to previous intercalation strategies. The Fe 14 Se 16 (tepa) 0.8 phase is in a tetragonal layered hybrid structure with a nanoplate shape. Composition analyses reveal a Fe-poor characteristic of the hybrid in contrast to previous FeSe-intercalated superconductor, and selected area electron diffraction pattern is featured by Fe 3 Se 4 superstructures with a √2 × √2 of Fe vacancy order. Ab initio density functional calculations show that minus Fe 3 Se 4 ions are stable in the hybrid and ∼0.25e − /Fe 0.75 Se is obviously larger than the reported values of approximately 0.2e − /FeSe in other FeSe-intercalated superconductors. Typical hysteresis loops and temperature dependence of dc/ac susceptibilities of the Fe 14 Se 16 (tepa) 0.8 measured below ∼42 K suggest a presence of the Meissner effect in this material. Effects of synthesis conditions on structures and magnetic properties of the hybrids show a magnetic evolution from a long-range ferrimagnetic (FIM) order of Fe 14 Se 16 (tepa) to a coexistence of FIM and superconducting (SC) orders of Fe 14 Se 16 (tepa) 0.9 and an SC order of Fe 14 Se 16 (tepa) 0.8 . X-ray absorption spectrum (XAS) confirms the presence of ferric/ferrous irons. Mössbauer studies reveal that the high- T C superconductivity originates from a suppression of the FIM order through tuning the spin states of irons from high-spin Fe 3+ ( S = 5/2) and Fe 2+ ( S = 2) in the Fe 14 Se 16 (tepa) to low-spin Fe 3+ ( S = 1/2) and Fe 2+ ( S = 0) in the Fe 14 Se 16 (tepa) 0.8 . Although no zero resistance is detected even at a temperature of 2 K, the resistivity at 2 K decreases by more than 1600 times compared to that in a normal state calculated by a variable range hopping (VRH) model, suggesting that the high- T C superconductivity of Fe 14 Se 16 (tepa) 0.8 is possible.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 31
·期 5
·7027-7042
·
IF 5.8
Chen Xuewen,Quan Hongping,Yu Jie,Hu Yuling,Huang Zhiyu
In order to reduce the impact of greenhouse gases on the environment, the development of various new CO 2 capture materials has become a hot spot. In this work, a novel composite amine solid adsorbent was prepared by simultaneously using tetraethylenepentamine (TEPA) and 2-[2-(dimethylamino) ethoxy] ethanol (DMAEE) for amine functionalization on the polyester microsphere carrier. The introduction of methyl methacrylate (MMA) with high glass transition temperature into the polyester carrier makes the carrier microspheres have high hardness. At the same time, the carrier also contains active epoxy groups and hydrophobic glycidyl methacrylate (GMA, which can undergo ring-opening reaction with composite amines to achieve high-load and low-energy chemical grafting of amines on the carrier. The composite aminated polyester microspheres were used as an efficient adsorbent for CO 2 in simulated flue gas. The results show that the synergistic effect of TEPA-DMAEE composite amine system in the adsorbent is beneficial to the improvement of CO 2 capture capacity. When the total amine content in the impregnating solution is 45 wt% and the composite amine ratio is TEPA: DMAEE = 6: 4, the CO 2 adsorption capacity can reach the optimal value of 2.45 mmol/ g at 70 °C. In addition, the composite amine microsphere adsorbent has cyclic regeneration performance. Importantly, through kinetic fitting, the Avrami kinetic model fits the CO 2 adsorption better than the quasi-first-order and quasi-second-order kinetic models, which proves that physical adsorption and chemical adsorption coexist in the adsorption process. This simple, long-term stable and excellent selective separation performance makes amine-functionalized adsorbents have potential application prospects in CO 2 capture. Graphical abstract
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
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1831-1838
·
IF 1.947
Mutyala Suresh,Yu Ya-Dong,Jin Wei-Guang,Wang Zhi-Shuo,Zheng Deng-Yue,Ye Chun-Rong,Luo Binbin
Composite material, tetraethylenepentamine (TEPA) incorporated UiO-66 was prepared by impregnation method to study CO 2 capture in a fixed bed reactor, atmospheric pressure. All synthesized adsorbents were characterized using PXRD, N 2 adsorption–desorption isotherms, FT-IR, TGA, SEM, and Elemental analysis. Characterization results have revealed that incorporated TEPA was present within pores of UiO-66. CO 2 adsorption was higher on TEPA incorporated UiO-66 compared to UiO-66. It was due to the chemical interaction between –NH 2 and CO 2 . High CO 2 adsorption capacity 3.70 mmol g −1 was obtained on 30TEPA/UiO-66 at 75 °C, 1 bar. Because of more flexibility and high dispersive nature of TEPA at this temperature. The same CO 2 adsorption capacity was obtained in each adsorption cycle without decomposition of the amine on 30TEPA/UiO-66. Avrami adsorption kinetic model has suggested adsorption of CO 2 on composite material was chemical adsorption and deactivation model suggested an initial rate of adsorption was higher on TEPA incorporated UiO-66.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8.9
Wenxu Ma,Dawei Sun,Zhen Chen,Dongyou Qi,Zhaojia Wang,Jiaxin Wang,Ruifeng Tang,Zhiyong Wang,Suping Cui
Cracks are inevitable during the service of cement-based facilities. The application of microcapsule technology to cementitious materials has realized the self-healing of cracks. In this research, tetraethylenepentamine (TEPA) was successfully encapsulated with polyethylene glycol (PEG)/polyurea shell by integrating melting-dispersion-condensation and interfacial polymerization method. The average diameter of final microcapsules prepared at 300 RPM was 666.9 ± 345.8 μm and the shell thickness was 45.5 ± 1.6 μm. The final microcapsules demonstrated good dispersibility and thermal stability. The normalized strength of the final microcapsules ranged from 0.6 MPa to 1.0 MPa. Moreover, the final microcapsules could remain stable completely both in ambient water and saturated calcium hydroxide (Ca(OH) 2 ) solution for 12 h. Additionally, the final microcapsules remained integral structure during mixing with fresh cement paste and were uniformly dispersed in the hardened cement paste. When microcapsules dosage was 3.0 wt%, the compressive strength of 28 days exceeded 50 MPa and the self-healing rate of compressive strength reached the highest, up to 27.5%. After self-healing, specimens containing microcapsules exhibited excellent resistance to water penetration. The single microcrack of self-healing cement paste with hydration ages of 7 days, 28 days, or even 56 days could be repaired to varying extent and the maximum repairable microcrack width was 145.6 ± 21.6 μm.
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Bei Liu,Mingxing Zhou,Zhinan Wu,Xulong Song,Tong Zhou,Shipeng Cao,Chongjian Jiang,Xinwei Zhang,Xiwen Zhang,Liwen Mu,Han Lin,Xiaohua Lu,Tuo Ji,Shuandi Hou,Jiahua Zhu
Amine-based sorbents are promising for low-concentration CO 2 capture, yet their practical application has long been hindered by poor stability. In this study, amidated tetraethylenepentamine (TEPA) network (ATN) sorbents were synthesized by crosslinking TEPA with 4 binary organic acids in the molded alumina-silica (MAS) supports. Characterizations confirm the successful formation of amide bonds between the primary amines of TEPA and binary acids within the pore channels, a key innovation that reconfigures TEPA distribution—shifting from a wall-attached state (as in conventional systems) to an aggregated polymeric network. This structural breakthrough yields remarkable stability enhancements: unlike TEPA/MAS, which loses ∼90 % of its initial capacity after 50 cycles, TEPA/MAS- t , t -MA, and TEPA/MAS-FA retain ∼80 % of their capacity under the same conditions. Experimental results and DFT calculations further reveal a novel mechanistic insight: acids containing double bonds form more stable amide networks with stronger p-π conjugation than straight-chain acids. By integrating molecular crosslinking with porous support engineering, this strategy offers a robust framework for designing durable, high-performance CO 2 capture materials for actual applications.
研究领域:
材料科学
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环境工程
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碳捕集与封存
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化学工程
✓ 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）