Separations
·
2024
·Vol. 11
·期 1
·20
·
IF 2.5
Wenxia Xie,Chunmin Tu,Jun Zhang,Chengwei Xu
The accumulation of uncollected fly ash from flue gas in post-combustion CO2capture processes is a significant concern in current coal-fired power plants due to its potential impact on the performance of CO2absorbent and absorption towers. In order to determine the effect of fly ash on the mass transfer performance of CO2absorption into monoethanolamine (MEA) and diethanolamine (DEA) aqueous solutions, experimental studies were carried out using a small-sized packed tower equipped with θ-ring random packing. These studies were conducted under various operating parameters, including solution temperature, liquid/gas ratio (L/G), packing height, and fly ash concentration. The results show that the effect of fly ash on the outlet CO2concentration was primarily observed during the initial stages of the experimental process. Moreover, the presence of fly ash leads to a reduction in the volumetric overall mass transfer coefficient (KGav) when using MEA and DEA solution, and increasing the fly ash concentration further exacerbates this negative impact. However, the effect of fly ash on the reduction inKGavis not significantly related to its chemical composition but rather depends on the operational parameters. With increasing solution temperature, liquid/gas ratio (L/G), and packing height, theKGavvalues for different solutions exhibit an upward trend. The negative effect of fly ash onKGavremains relatively stable for MEA as solution temperature and packing height increase. Compared to MEA, fly ash has a greater negative effect on DEA solution under the same experimental conditions. The analysis reveals that the detrimental effect of fly ash onKGavprimarily stems from its ability to alter the distribution state of the absorption liquid within the packed tower.
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
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2021
·
IF 10.088
Baojing Feng,Guonan Liu,Peixu Yang,Sensen Huang,Dongqing Qi,Peng Chen,Chengduo Wang,Jiang Du,Shaojun Zhang,Jinhui Liu
Effect of the second phase in the micro-galvanic corrosion of a commercial Mg alloy containing rare earth elements, cast WE43 alloy, was investigated in 0.6 M NaCl solution and 0.6 M Na 2 SO 4 solution by scanning electron microscopy (SEM) observations, scanning Kelvin probe force microscopy (SKPFM) analysis, hydrogen evolution, weight loss measurement, and electrochemical techniques. It is confirmed that the second phase of cast WE43 alloy is more active than Mg matrix and exhibits an anodic role in the micro-galvanic corrosion with α-Mg matrix as cathode and dissolves preferentially in Na 2 SO 4 solution, in contrast to the situation in NaCl solution. The corrosion rate of cast WE43 alloy in Na 2 SO 4 solution is much higher than that in NaCl solution, which is different from the conventional wisdom and could be attributed to the different role of the second phase in the micro-galvanic corrosion in two solutions.
研究领域:
材料科学
·
腐蚀科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Chen Wang,Feng Wu,Yanfeng Sui,Guoxiong Wang,Tielin Wang,Jiayu Ma
The solubility of K2SiF6 in MgCl2 and FeCl3 solutions within a temperature range between 20 and 70 °C was experimentally determined by the static method under atmospheric pressure. The equilibrium solids obtained under various conditions were analyzed by XRD, SEM, and FTIR to confirm the stability of corresponding solid phases. The solubility of K2SiF6 in MgCl2 and FeCl3 solutions increased with increasing temperature and concentration, and K2SiF6 remained stable in MgCl2 and FeCl3 solutions. Moreover, the experimental data were successfully correlated with the Apelblat empirical equation. The thermodynamic properties of the solution process, including the Gibbs energy, enthalpy, and entropy, were calculated by the van’t Hoff analysis and the Gibbs equation. The dissolution process of K2SiF6 in the measured solutions was found to be endothermic and nonspontaneous. The findings above can provide fundamental data and theoretical support for optimizing the crystallization of K2SiF6 in acid leaching solution from phosphorus–potassium associated ore and preventing scale formation of K2SiF6 in wet-process phosphoric acid (WPA) vacuum filtration.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Yanfei Fan,Dongdong Li,Dandan Gao,Dewen Zeng,Wu Li
Specific heat capacity of Rb 2 SO 4 (aq) and Cs 2 SO 4 (aq) solutions was determined using a Calvet-type calorimeter from 288.15 K to 338.15 K and from about 0.25 mol·kg −1 to concentration near room temperature solubility limits. For both Rb 2 SO 4 (aq) and Cs 2 SO 4 (aq) solutions, the specific heat capacity decreases with the increase of molality at constant temperature. Combining the heat capacity data determined in this study and other thermodynamic properties ( i.e. water activity, osmotic coefficient, mean ionic activity coefficient, enthalpy of dilution and solubility) reported in literature, thermodynamic and phase equilibria properties of the binary Rb 2 SO 4 + H 2 O and Cs 2 SO 4 + H 2 O systems were modelled using a comprehensive thermodynamic framework, in which a Pitzer-Simonson-Clegg model was applied to represent the non-ideality of aqueous phases. The models can represent all the properties over wide temperature and concentration ranges. This study forms a basis for solubility prediction in multi-component systems containing Rb and Cs sulfates.
研究领域:
物理化学
·
热力学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Mengjie Chen,Qinlan Luo,Haizhou Lin,Qiang Sun,Hongxia Gao,Sen Liu,Yuanyuan Li,Zhiwu Liang
The kinetic behavior of the reaction of CO 2 with MEA-TREA in ethanol solution was studied using the stopped-flow technique. The results indicate that the zwitterion mechanism successfully correlates the experimentally measured pseudo first-order reaction constant ( k 0 ) and that the TREA participated in the deprotonation step of MEA-zwitterion as an alkaline substance after the formation of MEA-zwitterion. Then, the applicability of this proposed mechanism was investigated by using the reaction kinetics of CO 2 with MEA-DMEA, MEA-DEEA, MEA-MDEA, DEA-TREA, DEA-DMEA blended amines in non-aqueous ethanol solution, as well as MEA-TREA, MEA-DMEA, DEA-TREA, DEA-DMEA blended amines in water-lean solutions. It was found that the mechanism of the reaction of CO 2 with these mixed amines can be expressed by: k 0 = K A - A z [ A ] 2 + K A - B z [ A ] [ B ] + K 1 z [ A ] . The ethanol and water molecules which contribute to K 1 z can be used as proton transfer channels to accelerate proton transfer, but they do not directly participate in the reaction. In addition, the alkalinity and the steric hindrance effect controlled by the molecular structure of tertiary amines affected the reaction rate at the same time. The activation energies in MEA-EtOH and MEA-TREA-EtOH system were estimated by fitting the second-order rate constants to the Arrhenius expression, indicating that TREA can reduce the reaction activation energy and make the reaction more kinetically favorable.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Zhang,Weicheng Fu,Zihao Wang,Shuang Wu,Zhipeng Wang,Yaoming Wang
In this study, organic solutions (30–120 mg/L HA, BSA or SA) and composite solutions (5.93–10.15 wt% inorganic salts with 75 mg/L HA, BSA or SA) were used to investigate the membrane fouling behavior in the vacuum membrane distillation (VMD) system. The different permeate flux attenuation and fouled membrane morphology implied distinct membrane fouling mechanisms during VMD process. Furthermore, we employed the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory as an effective approach to analyze membrane fouling mechanisms. The results showed that the total interaction energy was negative (attraction) within the separation distance of 1–2 nm by applying the XDLVO approach, indicating that a pristine membrane was more prone to fouling. Finally, we elucidated distinct membrane fouling mechanisms in the VMD system. The inorganic feed solution readily induced inorganic fouling on the membrane surface and pore wetting, while organic feed solution and combined feed solution did not cause membrane wetting, conversely, only organic fouling and combined fouling were identified on the membrane surface. This study was expected to facilitate understanding of membrane fouling mechanisms in the VMD process.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
DOI
高影响因子
Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 4
·1883-1890
·
IF 5.503
Chengbo Wei,Xiaoming Fan,Xue Deng,Linzheng Ma,Xiao Zhang,Qingyun Liu,Jinxue Guo
Efficiently generating hydrogen in neutral solution is essentially important for electrocatalysts toward practical application of water splitting; however, most of the catalysts show promising activity only in acidic or alkaline media. Herein, a surface modulation method is developed via doping Ru onto the surface of a Ni2P nanosheet array supported on nickel foam (Ru-Ni2P/NF) to activate the robust hydrogen evolution activity. The Ru species achieve optimized surface chemistry for catalysis, including boosted intrinsic activity, improved catalytic center density, and enhanced kinetics. The as-obtained electrode exhibits Pt-like catalytic activity, as well as good stability in both neutral and alkaline solution. Exploring efficient and wide-pH electrocatalysts by such surface chemistry modulation would be of great value for the development of advanced materials for energy conversion.
研究领域:
材料科学
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电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2020
·Vol. 93
·期 3
·380-392
·
IF 0.69
Li Jianbo,Lv Jie,Fu Luoping,Tang Mingjin,Wu Xiaodan
Abstract Inspired by the high-water solubility, photoluminescence and low cytotoxicity of N-doped carbon quantum dots (N-CQDs), fluorescent corrosion inhibitors with size of 4–8 nm were synthesized from disodium ethylenediaminetetraacetate, sulfamic acid, and urotropine salt. We expect that these N-CQDs may possess an excellent protective ability to inhibit the corrosion of carbon steel in aggressive solutions owing to its special functional group. The inhibitory mechanism of the inhibitor on N80 steel in saturated CO 2 3 wt % NaCl solution was studied by weight loss, adsorption curve fitting, electrochemical measurement, and surface morphology and elemental analysis. The results show that corrosion of N80 carbon steel in saturated CO 2 3 wt % NaCl solution is significantly inhibited by the addition of N-CQDs, which is attributed to the formation of its adsorption film, preventing the contact of iron with chloride ions and is an effective corrosion inhibitor.
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jingwei Zhang,Hui Kang,Zetong Li,Siqing Yuan,Yihuan Wang,Dewen Zhao,Zhimin Chai,Xinchun Lu
Solution-based processes have emerged as a compelling alternative to the traditional vacuum-based physical vapor deposition to fabricate indium tin oxide (ITO) films owing to their advantages of cost-effectiveness, being vacuum-free, and simple equipment. Despite extensive research to improve the electrical properties of ITO films as transparent conductive oxides (TCOs), the influence of precursor solution composition on these properties remains unexplored. Here, we prepare precursor solutions that vary in anionic groups and metal cation valence states and investigate how the composition of these solutions influences the electrical properties of the solution-processed ITO films. The results reveal that incorporating nitrate anion-based precursors and Sn (II)-based precursors in the solutions leads to the ITO film with a low resistivity of 3.5 × 10–3 Ω cm. This performance is attributed to the abundant formation of M-O-M bonds and the appropriate concentration of oxygen vacancies in the polycrystalline ITO films. Thin film transistors utilizing ITO patterns with reduced resistivities demonstrate enhanced field-effect mobilities, which can be attributed to the decreased contact resistances between the ITO source/drain electrodes and indium oxide channels. The practical application of patterned ITO films in flexible electroluminescent devices is demonstrated, highlighting the immense potential of using our ITO films in optoelectronic and flexible technology.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Greenhouse Gas Control
·
2020
·
IF 3.639
Kang Shunji,Shen Xizhou,Yang Wenze
In this paper, by means of thermo-gravimetric analysis(TGA), the desorption kinetics of CO 2 absorbed in two kinds of rich amine solutions, MDEA (3.25mol/L) and MDEA+DEA(3.25mol/L-0.3mol/L), were investigated under different heating rates(2.5℃/min, 5℃/min, 10℃/min and 20℃/min). The thermal analysis kinetics was applied to analyze the TG-DTG curves of two rich amine solutions so as to research CO 2 desorption kinetics. In addition, the CO 2 desorption kinetics parameters have been calculated with model-free method Flynn-Wall-Ozawa (FWO) and model-fitting method Coats-Redfern (CR). The results indicated that CO 2 desorption process could be divided into two stages. The CO 2 and H 2 O were released with non-uniform speed in the first stage and MDEA or DEA with higher boiling points were evaporated in the second stage. For MDEA solution the average activation energy E was 50.36kJ/mol, the pre-exponential factor A was 1.68×10 7 , and the most probable integral mechanism function was G α = α 3 / 2 . For MDEA+DEA solution the average activation energy E was 59.68kJ/mol, the pre-exponential factor A was 2.22×10 7 , and the most probable integral mechanism function was G α = [ ( 1 + α ) 1 / 3 − 1 ] 2 . The technical feasibility of CO 2 desorption performance in rich amine solutions with thermo-gravimetric analysis method was demonstrated.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
D.D. Liu,N.S. Yu,D.P. Liu,Y.Y. He,R. Liu,Q.J. Li,B. Liu,B.B. Liu
C 60 nano/microcrystals were synthesized from fullerene dissolved in three different trichlorobenzene isomers, to investigate the role of solvent as both shape and morphology controller in the synthesis of C 60 nanocrystals. Various C 60 nano/microcrystals, in particle-, sheet-, cuboid- and rod morphologies have been selectively fabricated at 80 °C using either solution evaporation or solution mixing method. The molecular structure of trichlorobenzene solvent plays a key role in the formation of different crystal morphologies, and also affects the crystal structure of synthesized samples.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2019
·Vol. 15
·期 12
·1805474
·
IF 10.856
Yi Jiang,Xingqiao Wu,Yucong Yan,Sai Luo,Xiao Li,Jingbo Huang,Hui Zhang,Deren Yang
Developing an efficient electrocatalyst for the hydrogen evolution reaction (HER) working in both acidic and alkaline solutions is highly desirable, but still remains challenging. Here, Pt x Ni ultrathin nanowires (NWs) with tunable compositions ( x = 1.42, 3.21, 5.67) are in situ grown on MXenes (Ti 3 C 2 nanosheets), serving as electrocatalysts toward HER. Such Pt x Ni@Ti 3 C 2 electrocatalysts exhibit excellent HER performance in both acidic and alkaline solutions, with the Pt 3.21 Ni@Ti 3 C 2 being the best one. Specifically, Pt 3.21 Ni@Ti 3 C 2 achieves record-breaking performance in terms of lowest overpotential (18.55 mV) and smallest Tafel slope (13.37 mV dec −1 ) for HER in acidic media to date. Theory calculations and X-ray photoelectron spectroscopy analyses demonstrate that the coupling of MXenes with the NWs not only approaches the Gibbs free energy for hydrogen adsorption close to zero through the electron transfer between them in acidic media, but also provides additional active sites for water dissociation in alkaline solution, both of them being beneficial to the HER performance.
研究领域:
材料科学
·
电化学
·
纳米催化
·
能源材料
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）