APPLIED CLAY SCIENCE
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2024
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IF 5.3
Yao Xiao,Biao Li,Yinggang Huang,Zheng Gong,Pengfei Diao,Chuansheng Wang,Huiguang Bian
In this study, a silane coupling agent and kaolin, a natural mineral resource, were introduced into the wet mixing process of natural rubber latex, the high wear-resistant and low-generation heat natural rubber composites were prepared. The sputtering, collision, and deposition of coupling agent/fillers/natural rubber latex mixed emulsion onto the roller effectively could break up the filler aggregates, enable fillers to be better infiltrated, distributed, and dispersed in the rubber. The effects of dry/wet mixing processes and the ratio of kaolin to silica on the crosslinking density, filler dispersion, extrusion rheological properties, gas barrier properties, dynamic mechanical properties and thermal stability of NR composites were investigated, and the silanization mechanism was summarized by FTIR and XRD. The experimental results showed that kaolin improved the crosslinking density and failure temperature, reduced the Payne effect, extrusion swell, and rolling resistance. Compared with 60 phr silica-filled natural rubber, the gas barrier property and wear resistance of 60 phr kaolin-filled natural rubber were improved by 64 % and 27 %, respectively, and the rolling resistance was reduced by 57 %. When the ratios of silica to kaolin were both 20:40, the crosslinking density, gas barrier property, and wear resistance of wet mixing were improved by 24 %, 45 %, and 9 %, respectively, compared with dry mixing. This study provided a new method for the high-value application of kaolin in wet mixing and green tires.
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 Materials Chemistry A
·
2021
·Vol. 9
·期 21
·12763-12771
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IF 12.732
Fa-Qian Liu,Xin Liu,Lishui Sun,Rongxun Li,Chun-Xiao Yin,Bozhen Wu
Polyamine-based solid adsorbents are promising candidates for CO2 capture, but long-term stability under practical regeneration conditions (100% CO2 at 120 °C) remains the biggest hurdle. In this paper, we prepared MXene-supported adsorbents with excellent long-term stability by combining two strategies. First, 1,2-butylene oxide (BO) with an epoxy group was grafted onto polyethyleneimine (PEI) to suppress the formation of urea. Second, Ti3C2(OH)x MXene was used as the support of polyamines to improve the wear resistance and thermal conductivity. The prepared MXene-supported adsorbents exhibit a large working capacity (2.6 mmol g−1) and a very stable cycling stability because of the synergetic effect. The adsorbents also exhibit a very low regeneration heat of 1.90 MJ per kg (CO2) and a high mechanical stability against attrition (0.26% after 5 h time-on-stream). Thus, these MXene-supported adsorbents make the CO2 capture process promising.
研究领域:
材料科学
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环境工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
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IF 6.653
Lidong Wang,Yifeng Zhang,Rujie Wang,Qiangwei Li,Shihan Zhang,Meng Li,Jie Liu,Bo Chen
A novel phase splitter, namely, sulfolane, was proposed to advance the traditional monoethanolamine (MEA) absorption technology for CO2 capture by simultaneously promoting the absorption rate and lowering heat duty. The phase-splitting phenomenon was observed after the CO2 loading level had exceeded 0.73 mol CO2/L, thereby generating a CO2-rich MEA upper layer and a lower layer containing sulfolane. Sulfolane facilitated CO2 absorption because of its strong affinity with acid gases, which resulted in an absorption rate 2.7 times higher than that of the conventional MEA process. The process simulation using Aspen Plus indicated that the regeneration heat with the MEA/sulfolane mixture as a solvent substantially decreased to 2.67 GJ/t-CO2, which was 31% lower than that of the conventional MEA process (3.85 GJ/t-CO2). Moreover, the sensible heat and vaporization heat of MEA/sulfolane were markedly decreased by 62.4% and 47.9%, which could be ascribed to the decreased stripping volume and relatively high CO2 partial pressure caused by liquid–liquid phase separation. The proposed system is proved to be a promising candidate for the advancement of CO2 capture techniques with high CO2 absorption capacity, rapid absorption rate, and low-energy penalty.
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Bozhen Wu,Xuejiao Song,Dongchen Zheng,Qianyun Tan,Yong Yao,Fa-Qian Liu
Under favorable regeneration conditions (120 °C, 100% CO2), ultrafast adsorption kinetics and excellent long-term cycle stability are still the biggest obstacles for amine-based solid CO2 adsorbents. Inspired by natural wood, a biochar with a highly ordered pore structure and excellent thermal conductivity was prepared and used as a carrier of organic amines to prepare ideal CO2 adsorbents. The results showed that the prepared adsorbent has a very high adsorption working capacity (4.23 mmol CO2·g–1), and its performance remains stable even after 30 adsorption–desorption cycles in the harsh desorption environment (120 °C, 100% CO2). Due to the existence of the hierarchical structure, the adsorbent exhibited ultra-fast adsorption kinetics, and the reaction rate constant is 37 times higher than that of traditional silica. This adsorbent also showed a very low regeneration heat of 1.64 MJ·kg–1 (CO2), which is especially important for the practical application. Therefore, these biochar-based adsorbents derived from natural wood make the CO2 capture process promising.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Shihan Zhang,Yao Shen,Peijing Shao,Jianmeng Chen,Lidong Wang
The main issue related to the deployment of the amine-based absorption process for CO2 capture from flue gas is its intensive energy penalty. Therefore, this study screened a novel biphasic solvent, comprising a primary amine e.g., triethylenetetramine (TETA) and a tertiary amine e.g., N,N-dimethylcyclohexylamine (DMCA), to reduce the energy consumption. The TETA-DMCA blend exhibited high cyclic capacity of CO2 absorption, favorable phase separation behavior, and low regeneration heat. Kinetic analysis showed that the gas- and liquid-side mass transfer resistances were comparable in the lean solution of TETA-DMCA at 40 °C, whereas the liquid-side mass transfer resistance became dominant in the rich solution. The rate of CO2 absorption into TETA-DMCA (4 M, 1:3) solution was comparable to 5 M benchmark monoethanolamine (MEA) solution. Based on a preliminary estimation, the regeneration heat with TETA-DMCA could be reduced by approximately 40% compared with that of MEA. 13C NMR analysis revealed that the CO2 absorption into TETA-DMCA was initiated by the reaction between CO2 and TETA via the zwitterion mechanism, and DMCA served as a CO2 sinker to regenerate TETA, resulting in the transfer of DMCA from the upper to lower phase. The proposed TETA-DMCA solvent may be a suitable candidate for CO2 capture.
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 56
·期 5
·4034-4050
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IF 3.553
Cheng Shuaishuai,Duan Xiaoyuan,Zhang Zhiyi,An Dong,Zhao Guizhe,Liu Yaqing
Owing to its remarkable electrical, mechanical and thermal properties, graphene has been considered the most promising reinforcing filler for the development of rubber nanocomposites. In this work, a novel interfacial structure consisting of reduced graphene oxide (rGO)/N-tert-butyl-2-benzothiazole sulfonamide (NS)/natural rubber (NR) (NR/NS-rGO) with covalent bond connections was fabricated using one-step modification and coprecipitation methods. When the filler loading of NS-rGO is 0.42 vol.%, not only the thermal conductivity of the rubber composite increases to 0.237 Wm −1 K −1 , which is 21.5% higher than that of pure NR; meanwhile, the internal heat generation decreases to 2.6 °C, which is 45.8% lower than that of reduced graphene oxide (rGO)/ascorbic acid (VC)/natural rubber (NR) (NR/VC-rGO), and the mechanical properties have been greatly improved. The results demonstrated that the covalent bond connections greatly reduced interfacial thermal resistance at the filler/matrix interface. Furthermore, the enhanced interfacial interaction reduced frictional heat generation at the filler/matrix interface. More importantly, this strategy provided creative insights into the high application potential of graphene in the rubber industry.
研究领域:
材料科学
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橡胶工业
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产品关联
DOI
高影响因子
ENERGY
·
2018
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IF 4.968
Zeyang Wu,Sen Liu,Hongxia Gao,Qiqi Yin,Zhiwu Liang
The structure-activity relationship of eleven diamines and MEA was investigated in order to provide guidance for the selection of the potential CO 2 capture absorbent. The effects of methyl, ethyl, hydroxyl groups, and distance between N groups in molecular structures were evaluated experimentally by using the rapid fast screening method and computed by Gaussian 09. Experimental results revealed that the proper number of methyl groups and ethyl groups on N atom could improve the absorption rate as well as the cyclic CO 2 capacity, and the addition of a hydroxyl group actually achieved a lower energy requirement (i.e. cyclic CO 2 capacity) for solvent regeneration with the decreasing stability of carbamate. In addition, the diamine with a hydroxyl group is more favorable for good stability in regeneration process, which addresses the problem of solvent loss in the application of diamines. Chain length extension from C 2 to C 3 can result in the poorer stability of the carbamate and lower energy requirement for amine regeneration. Thus, the lowest energy consumption (i.e. CO 2 cyclic capacity) was then achieved by aqueous 2-((2-aminoethyl)amino)ethanol (AEEA) solution, presenting it can be considered as an alternative or a potential absorbent for post-combustion CO 2 capture. Furthermore, the relative free energies of the tested diamines were computed by the Gaussian software for validating the stability of the carbamate formation , the order of which is in accordance with the order of the cyclic CO 2 capacity for all tested amines, indicating the experimental conclusion can be reliable.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Xiaoyuan Duan,Rongyao Tao,Yuchen Chen,Zhiyi Zhang,Guizhe Zhao,Yaqing Liu,Shuaishuai Cheng
It is still a bottleneck to simultaneously attain enhanced mechanical properties, thermal conductivity and low heat build-up properties for graphene-rubber composites obtained by conventional fabrication processes. The critical elements to enhance the comprehensive performance of rubber include excellent dispersion and the interaction of filler and matrix. In this work, the increased filler structure degree with point-surface structured SiC/GO (SG) and the strong interface modified with nano-sulfur synergistically improve the dispersibility and interfacial interaction, which effectively achieves excellent integrated performance at low filler content. More importantly, nano-sulfur not only acts as a modifier to improve interfacial compatibility, but also has a vulcanization function that enables SG and natural rubber (NR) molecular chains to form a uniformly distributed cross-linked network structure. Consequently, only when 4 phr of SiC/GO-S (SG-S) filler was added to NR, the tensile strength , thermal conductivity and low heat generation properties are higher than those of NR/GO rubber by 22.5%, 21.2% and 8.3%. Therefore, this work may open new horizons for the development of green tire.
研究领域:
材料科学
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橡胶复合材料
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DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 137
·期 4
·1225-1232
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IF 2.471
Wu Bo,Zhao Yuanyang,Liu Qinfeng,Zhou Changlin,Zhang Xi,Lei Jingxin
Utilization of renewable biomass to prepare phase change material (PCM) that can reversibly store renewable thermal energy is of great interest. Castor oil with functional hydroxyl groups is especially attractive for the preparation of polymeric materials. In this work, a novel castor oil-based polyurethane-acrylate oligomer (COPUA) was firstly synthesized through a two-step condensation reaction. Followed by in situ polymerization of COPUA in the presence of palmitic acid (PA), a novel biomass-based form-stable PCM was prepared, in which renewable PA serves as phase change functional ingredient and castor oil-based crosslinking network acts as encapsulation material. Tailoring the mass ratio of PA and COPUA provides the ultimate encapsulation ratio (70%) of PA in form-stable PCM. The chemical structure, crystalline property, thermal property of form-stable PCM were characterized using Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, differential scanning calorimetry and thermogravimetric. Those results demonstrate that the prepared form-stable PCM possesses that good thermal storage capacity with the phase change enthalpy reaches 141.2 J g −1 . Accelerated thermal cycling test was also performed to illustrate the thermal reliability of form-stable PCM.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2023
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IF 5.2
Dong An,Yiwen Cui,Rizheng He,Jiaqi Chen,Xiaoyuan Duan,Jiaxiong Li,Yaqing Liu,Yanli Liu,Huitao Yu,Chingping Wong
With the rapid development of transportation system, the safety, reliability, and durability of green tires play an important role in modern transportation. While for the material preparation, the poor dispersion ability of reinforced filler and the weak interfacial interactions with polymer matrix seriously restricted the further application in the green tire field. Meanwhile, avoiding the use of organic solvents is also an environmental issue that needs to be considered in the preparation process. Herein, water-soluble 2-mercapto-1-methylimidazole (MMI) functionalized graphene oxide (GO-MMI) was obtained through a simple, green and one-step hydrothermal method. Additionally, the modified graphene oxide/natural rubber composites (GO-MMI/NR) with different GO-MMI content were prepared by the latex coprecipitation approach. As a result, the modified GO-MMI could be evenly dispersed in the NR matrix through the mechanical blending and the obtained GO-MMI/NR composites possessed the good comprehensive properties after vulcanization. Specifically, the tensile strength (26.8 MPa), elongation at break (801%), low heat build-up (6.2°C), Deutsches Institute for Normung (DIN) abrasion loss volume (71.31 mm 3 ) and heat resistance index (162.1°C) were synchronic-lifting when compared with the GO/NR composites. The results demonstrated that obtained GO-MMI/NR composites owned the promising application for the industrial-scale green tires.
研究领域:
材料科学
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交通运输工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2023
·Vol. 99
·期 1
·183-194
·
IF 3.4
Zhen Wang,Zhitao Han,Gang Liu,Zelu Zhou,Xi Wu,Song Zhou,Xinxiang Pan
BACKGROUND The large-scale practical application of CO 2 capture using carbonate solutions is mainly limited by their low CO 2 absorption rate. In view of this, it is feasible to improve CO 2 capture performance of carbonate solution by adding additives. In this paper, low-cost sodium carbonate (Na 2 CO 3 ) solution was selected as the main CO 2 absorbent, and the effects of different organic additives on CO 2 capture performance of Na 2 CO 3 solutions were systematically investigated. RESULTS The results showed that 0.04 mol/L tetrabutylammonium bromide (TBAB) could achieve a better enhancement effect on CO 2 capture performance of Na 2 CO 3 solution. After addition of TBAB, the maximum CO 2 absorption rate of Na 2 CO 3 solution was improved to 2.52 × 10 −3 mol/min, which increased by 105%. And the maximum CO 2 desorption rate could also be improved by 45%. TBAB/Na 2 CO 3 system not only realized a high CO 2 absorption capacity of 0.769 mol/mol, but also maintained 82% of the initial CO 2 absorption capacity after three cyclic tests. The regeneration heat duty of TBAB/Na 2 CO 3 solution was calculated to be 1136.6 kJ/mol, which was significantly lower than that of single Na 2 CO 3 solution and conventional MEA aqueous solution. The promotion mechanism of TBAB in Na 2 CO 3 solution was explored using Fourier transform infrared spectra (FTIR) and 13 C nuclear magnetic resonance (NMR) analysis. CONCLUSION The introduction of TBAB additive could significantly improve CO 2 capture performance of Na 2 CO 3 solution and reduce regeneration heat duty, making it a possible option in the field of post-combustion CO 2 capture. © 2023 Society of Chemical Industry (SCI).
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
J.Y. Yong,R.Y. Xie,Q. Huang,X.J. Zhang,B. Li,P.F. Xie,C.F. Wu,L. Jiang
Due to the superior CO 2 adsorption capacity and selectivity, amine-functional solid adsorbents have received increasing attention. Nevertheless, amine-functionalized polyporous materials have a large performance deviation when considering carbon removal capacity under wet flue gas. Therefore, a variety of metal–organic frameworks (MOFs) with amine functionality are synthesized in this work by appending diamine with a propylene linker to Mg 2 (dobpdc) (dobpdc 4- = 4,4′-dioxido-3,3′-biphenyldicarboxylate) and screened under the simulated flue gas environment with a high water content (7 v%). The results indicate that ndmpn-grafted Mg 2 (dobpdc) (ndmpn = N,N-dimethyl-1,3-propanediamine) has a high CO 2 adsorption capacity of 1.72 mmol/g at 60 °C with an extremely low regeneration heat (2.26 GJ/ton CO 2 at the desorption temperature of 145 °C). Adsorption property of ndmpn-Mg 2 (dobpdc) at high humidity is even more excellent than that of another well-reported diaminopropene-appended MOF, dmpn-Mg 2 (dobpdc) (dmpn = 2,2-dimethyl-1,3-propanediamine). Herein, van der Waals (vdW)-corrected density functional theory (DFT) calculations are used to quantitatively analyze binding strengths and water effects on it between diamine-appended Mg 2 (dobpdc) and CO 2 . It is revealed that the addition of water makes ammonium carbamate chains produced in ndmpn-Mg 2 (dobpdc) more stable. These chemisorption structures under humid conditions have also been disclosed by using 15 N solid-state nuclear magnetic resonance (NMR) spectroscopy experiments and DFT calculation. To conclude, we unveil the binary adsorption characteristics and mechanism of ndmpn-Mg 2 (dobpdc). It enables a thorough understanding of this compound and highlights its potential as a promising adsorbent under humid conditions for post-combustion 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
危险品化学品经营许可证（带存储）