CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Rui Zhang,Zhen Wang,Yifan Meng,Shiyan Jiao,Jixiang Jia,Yi Min,Chengjun Liu
The surface tension of silicate melts is a key property in liquid steel refining. Accurate estimation of surface tension can provide guidance for the design of slag composition and the control of the smelting process. In this study, 22 samples of the CaO–SiO 2 –Fe x O system were investigated by Raman spectroscopy to obtain the mole fraction of oxygen bonds, and structural data were interpolated to obtain the oxygen bond database within the compositional range. Based on spectral analysis, the formation mechanism of surface tension for the silicate melt was elaborated from the perspective of microstructure, and then a structure-based surface tension estimation model was developed for the present system. The root-mean-square error of the present model was 0.055 N·m −1 , indicating reasonable agreement between the predicted and experimental values, and the present estimation model had higher accuracy than Tanaka's model for the CaO–SiO 2 –Fe x O system and its subsystems.
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高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Zhongli He,Bing Song,Cai Liang,Bin Liu,Zhirui Ma,Keliang Pang,Jiangang Yang
Concerns about arsenic emission issues are growing as the arsenic discharged from coal-fired power plants seriously endangers the ecological environment and public health. The gas-phase arsenic capture by a CaO–Ca12Al14O33 synthetic sorbent at 1000–1200 °C in the simulated flue gas was conducted, with the influence of the addition ratio of Ca12Al14O33, temperature, retention time, and acid gases NO/SO2 considered in the study. The results indicated that the synthetic sorbent containing 15 wt % Ca12Al14O33 (Ca85Al15) exhibited much better arsenic adsorption performance than CaO, which was ascribed to the greatly strengthened sintering resistance of CaO particles by adding Ca12Al14O33, enabling arsenic adsorption and chemical reactions. Both the increasing temperature and retention time facilitated arsenic adsorption by Ca85Al15, and the hypertoxic arsenic vapor (As3+) was converted into arsenate (Ca3(AsO4)2) with less toxicity. In the presence of NO, the arsenic capture was gradually suppressed with increasing retention time. On the other hand, SO2 could slightly facilitate the capture of arsenic at 1000–1100 °C for 10 min; nevertheless, due to the formation of Ca4Al6O12SO4, the promotion effect was inhibited at a higher temperature and a longer retention time. In general, the study provided a basis for developing highly efficient solid sorbents toward controlling arsenic vapor emission derived from coal combustion, and the appropriate conditions for arsenic capture were at 1000–1100 °C.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 150
·期 10
·2863-2872
·
IF 2.482
Zhang Pingbo,Chen Yifeng,Zhu Mengnan,Yue Chengguang,Dong Yuming,Leng Yan,Fan Mingming,Jiang Pingping
Magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) exhibited good catalytic activity in the transesterification of glycerol and dimethyl carbonate to yield glycerol carbonate. The glycerol conversion of 97.7% and glycerol carbonate yield of 96.9% could be obtained in this reaction system under the optimized reaction conditions. CoFe 2 O 4 @(CaO–ZnO) was characterized by a series of techniques including TPD, XRD, SEM, TEM, EDS, VSM and BET to evaluate the physico-chemical properties of the catalyst. It was demonstrated that the interaction of acid–base sites improved the catalysis performance of CoFe 2 O 4 @(CaO–ZnO): the strong basic sites were beneficial to the activation of glycerol to glyceroxide anion which could increase glycerol conversion, and the acid site contributes to the carbonyl activation of dimethyl carbonate, converts glyceroxide anion to glycerol carbonate, and improves the selectivity of glycerol carbonate. Meanwhile, the solid–liquid separation process after reaction would be simplified significantly considering CoFe 2 O 4 @(CaO–ZnO) could be easily separated from the reaction mixture under magnetic action. Graphic Abstract Acidic–basic bifunctional magnetic mesoporous CoFe 2 O 4 @(CaO–ZnO) was used as a solid base catalyst for the glycerol transesterification. Basic sites were beneficial to the activation of glycerol to glycerol oxygen anion to increase glycerol conversion and acidic sites were beneficial to carbonyl activation of DMC to increase glycerol carbonate selectivity. With magnetism, the solid base catalyst was easily recovered.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Tao Liu
The current preparation of biomass-based hydrophobic absorbents still relies excessively on the use of fluorinated hydrophobic substances, which poses a risk of environmental pollution. This study aims to develop a sustainable and nonfluorinated method for fabricating biomass-based hydrophobic absorbents with enhanced recyclability and multifunctional surface properties. The chemical vapor deposition method based on nonfluorinated methyltrichlorosilane is used for the in situ growth of polysiloxane nanofilaments on the surface of Tong Cao (TC), resulting in the development of a TC-based hydrophobic absorbent. Upon organosilane modification, modified TC shows good hydrophobicity with a water contact angle of 93° and can be used to remove organic solvents from water. The absorption capacity of modified TC for different organic solvents is from 3.1 to 6.5 g/g. The percentage of retained absorption capacity of modified TC still remains at 98% after 10 consecutive uses, demonstrating a good recyclability. Modified TC also holds high organic solvents retention capacity as well as good self-cleaning and anti-fouling ability. These results indicate that modified TC with hydrophobicity and recyclability has potential for practical oily wastewater treatment.
研究领域:
材料科学
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环境工程
·
生物质利用
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表面化学
·
可持续技术
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Journal of Rock Mechanics and Geotechnical Engineering
·
2025
·
IF 10.2
Guanghe Li,Jiankang Feng,Dong Wang,Jingjing Zou,Yanrong Dong,Laigui Wang,Kun Fang,Chunbin Guo
Mudstone found in open-pit coal mines is prone to softening, expansion, and disintegration when exposed to water, leading to deterioration of its mechanical properties and causing slope instability. To address this issue, this study introduced a novel slope stabilization method that integrates coal-based solid waste (fly ash) with microbially induced carbonate precipitation. The effects of fly ash (FA) and CaO (FC) and Bacillus subtilis (BS) contents on the cohesion ( c ), internal friction angle ( φ ), unconfined compressive strength ( q u ), elastic modulus ( E ), Poisson’s ratio ( μ ), disintegration resistance, and microstructural characteristics of mudstone were evaluated through unconfined compressive strength tests, direct shear tests, disintegration test, X-ray diffraction, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results showed that under optimal curing conditions, the growth rates of c , φ , q u , E , and μ of the treated mudstone sample improved by +251.46%, +53.86%, +134.1%, +66.3%, and −65.61%, respectively, compared with those of plain mudstone samples. Moreover, its resistance to disintegration upon contact with water could be extended from 72 h to 10 d. The curing mechanism primarily involved the activation of FA into calcium silicate hydrate (C-S-H), calcium aluminate hydrate (C-A-H), Calcium Aluminum Silicate Hydrate (C-A-S-H), and microbially induced calcite (CaCO 3 ) precipitates. Under the action of an appropriate amount of curing agent, FC can provide an alkaline environment and nucleation sites for BS, making the calcium carbonate distribution more uniform. BS accelerates the catalysis of FC to form gelation products. Meanwhile, due to the continuous consumption of Ca 2+ and OH - , the equilibrium of the CaO dissolution shifts toward generating more Ca(OH) 2 , achieving a “three-way promotion” effect. On the contrary, these factors will inhibit each other due to the different rates of reaction output. The findings offer a viable solution for slope stability in open-pit coal mines and hold significance for safe mining, environmental protection, and sustainable use of coal-based solid waste.
研究领域:
岩土工程
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采矿工程
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环境科学
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生物地球化学
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固废资源化利用
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CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
·
2026
·
IF 2.2
Zhilong Sun,Jiyu Qiu,Chengjun Liu,Jie Qi,Bo Zhang
This study investigates the phase stability and isobaric heat capacities of some compounds in the CaO-Nb 2 O 5 -TiO 2 slag system derived from the Bayan Obo ore deposit. Four compounds in the CaO-Nb 2 O 5 system and three compounds in the Nb 2 O 5 -TiO 2 system were synthesized by solid-state sintering, viz CaNb 2 O 6 , Ca 2 Nb 2 O 7 , Ca 3 Nb 2 O 8 , Ca 4 Nb 2 O 9 , Nb 2 TiO 7 , Nb 10 Ti 4 O 29 and Nb 24 TiO 62' . In addition, we also tried to synthesize the potential ternary compounds C 8 N 7 T 6 , C 6 NT 3 , C 3 NT 3 , and “X” reported in literature. The phase synthesis results were characterized using a combined approach of SEM-EDS, XRD, and Rietveld refinement; then the isobaric heat capacities of the successfully synthesized compounds were determined over the temperature range from 373 K to temperatures below their melting points, from which the corresponding temperature-dependent polynomial expressions were established. Meanwhile, the standard molar enthalpies of formation and standard entropies of the synthesized compounds at 298 K were calculated using the two-parameter model. The current results can provide necessary experimental data for thermodynamic assessment and database development of the CaO-Nb 2 O 5 -TiO 2 system.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2026
·
IF 6.7
Zewei Liu,Fuhang Huo,Liping Zhang,Yong Liu,Xianglong Li,Lei Zhang,Huarui Zhang,Zixian Pang,Linhua Jiang,Bin Li
A composite material synthesized from HCl-treated red mud and γ-Al 2 O 3 (Al 1 HRM 2 ), was developed to enhance CF 4 decomposition in our previous study. However, its catalytic performance requires improvement, as it suffers from poor stability. In this study, the low-cost and anti-HF-corrosive CaO was utilized to further boost the material's CF 4 decomposition efficiency and stability. Specifically, decomposition efficiency and stability increased by 30% and 2.25 times than that of Al 1 HRM 2 , respectively. At the microscopic level, it was observed that after CaO uniformly distributed across the catalyst surface, it enhanced the Al-O (Al-O-Al) stretching vibration, increased the number of oxygen vacancies, and simultaneously prevented the phase transition from γ to α. Additionally, CaO intensifies the characteristic peaks of strong L-acid sites, enhancing their CF 4 adsorption capacity and strength. Specifically, Al Ⅲ sites facilitate C-F bond cleavage to form AlF 3 , which undergoes fluorine-oxygen exchange with CaO to produce CaF 2 . This process effectively inhibits F + occupation of γ-Al 2 O 3 active sites, thereby promoting CF 4 decomposition. This study utilizes RM as a high-performance material for CF 4 pollution control, achieving the goal of treating waste with waste across the aluminum industry supply chain. It provides a new technological foundation for purifying difficult-to-treat Perfluorocarbons greenhouse gases.
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Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Ruijing Sun,Jinhu Wu,Hui Wang,Wei Zhang,Chao Liu,Shaopeng Gu,Weihong Xing,Liang Yu
The reaction behavior between the carbon and mold fluxes during the heating process is vital for a successful continuous casting process and the high billet quality. A detailed investigation combined with thermogravimetry-mass spectrometry (TG-MS), differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and transmission electron microscopy (TEM) techniques was carried out to systematically investigate the transformation mechanistic of the macro physicochemical properties, melting behavior, viscosity, crystallization, and heat transfer performance caused by the reaction behavior. The results showed that the mold flux underwent carbonate decomposition (973–1223 K), solid reaction (1273–1573 K), and melting process (1473–1673 K) during the continuous casting process. The carbon-bearing mold flux exhibited an endothermic peak at approximately 1673 K, corresponding to a weight loss ratio of approximately 14.5% on the TG curve, confirming that carbon could react with the middle mineral phases Ca 2 SiO 4 , Ca 2 Al 2 SiO 7, and Na 6 Ca 3 Si 6 O 18 to form SiC, increasing the breaking temperature by approximately 293 K. SEM and TEM results indicated that the melting behavior was restrained by the carbon itself and the newly formed components. Besides, the addition of carbon increased the degree of polymerization of molten slag, the thickness of slag film and the proportion of small crystals in slag film, further leading to an increase in crystallization and heat transfer performances. The reaction mechanism between carbon and slag and the subsequent effects on melting point, viscosity, crystallization ratio and heat flux density were clearly understood, which is meaningful for the carbon blending process of the mold flux.
研究领域:
材料科学
·
冶金工程
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 5
·052504
·
IF 4.386
Kun Zhao,Kejia Liu
The formation of CaTiO3 during the electro-reduction of TiO2 pellets in CaCl2-based molten salts is unavoidable. So in present paper, the electro-deoxidation of porous CaTiO3 pellets was investigated. Cyclic voltammetry and constant potential electrolysis experiments were conducted to gain insight into the electro-deoxidation mechanism. From the results, two new reduction pathways of the porous CaTiO3 pellets were determined. The main factor influencing the reduction pathways is the porosity. When the porosity is low, CaTiO3 is directly reduced into TiO. With the porosity increases, some CaTiO3 will firstly be reduced into CaTi2O4 and then the CaTi2O4 is further reduced into TiO. The effect of the potential applied on the cathode on the possible reduction limit of the sample was discussed. The results indicated that the more negative the potential is, the faster the deoxidation rate is and the lower the deoxidation limit is. Only when the applied potential is more negative than −1.6 V vs Ag+/Ag, low-oxygen titanium (the oxygen content is lower than 1%) can be obtained in our experimental conditions. In addition, the microstructural kinetics of phase transformations during reduction of the CaTiO3 pellets were also discussed.
研究领域:
材料科学
·
电化学
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Jingxuan Luo,Rong Li,Wenhao Li,Shuhui Zhou,Zhiyuan Xu,Bangbang Liu,Chen Chen,Naijing Bu,Xiaodong Mao,Shaowei Zhang,Qiang Zhen
Hydration resistance is a critical performance indicator for MgO-CaO refractories in industrial applications. In this study, a novel anti-hydration strategy was developed through the construction of a composite organic–inorganic coating on MgO-CaO aggregates using a facile impregnation approach. The coating comprises a ZrCl 4 -derived sol, docosanoic acid (DCA, C 22 H 44 O 2 ), and nano-ZrO 2 particles. The modified aggregates exhibited super-hydrophobicity properties, with a water contact angle of 150.47°, which effectively inhibited moisture penetration. Upon heat treatment, the ZrCl 4 -derived sol decomposed and further reacted with CaO to form a dense CaZrO 3 layer, providing long-term hydration resistance. Hydration tests demonstrated exceptional stability, with a weight gain of only 0.025 % after 10 days of exposure to humid environments (at 25 °C and 85 % relative humidity). This work offers a scalable approach to enhance the durability of MgO-CaO refractories by integrating short-term hydrophobicity and long-term ceramic passivation.
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高影响因子
PROGRESS IN REACTION KINETICS AND MECHANISM
·
2026
·Vol. 51
·期 1
·
IF 4.8
Songsong Zhang,Daokuan Liang,Xiaofeng Li,Yaohui Fan,Heyi Huang,Xiao He,Lin Wang,Zhaoying Li,Yong Dong
As a major type of agricultural waste, bagasse is rich in volatile matter and low in ash, making it an ideal raw material for thermochemical conversion to hydrogen-rich gas. In this study, an ex-situ microwave-assisted catalytic pyrolysis technique was used. CaO and Na2CO3 and their mixed catalysts in different ratios were selected for the experiments at 550 °C. The aim is to optimize both the hydrogen yield and concentration of the components to produce high-quality fuel. Thermogravimetric analysis (TG/DTG) revealed the influence of the catalysts: Na2CO3 significantly promotes low-temperature deoxygenation, and CaO can effectively adsorb CO2. Molecular dynamics simulations showed that elevated temperatures promote carbon chain breakage, but too high a temperature (2,500 K) may lead to a carbonization cascade reaction, which inhibits bond breakage. The gas-phase products indicate that the mixed catalyst is most effective at a ratio of CaO : Na2CO3 of 1:3, achieving the highest H2 yield (maximum 17.26%) along with significant hydrocarbon generation inhibition (24.90%), and CO content reduction (23.45%). Catalyst characterization confirmed the presence of CaCO3 in the mixed catalysts after pyrolysis. The CaO : Na2CO3 = 1:3 catalyst was found to have a unique fibrous structure and a microporous network. Raman spectroscopy reveals the ordering of the carbon structure and differences in functional groups under the action of different catalysts. This study provides a theoretical basis for further optimizing the pyrolysis process of bagasse, and helps improve the conversion efficiency of biomass energy.
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 42
·10154-10160
·
IF 5.066
J. L. Wang,E. H. Song,M. Wu,W. B. Dai,X. F. Jiang,B. Zhou,Q. Y. Zhang
Room-temperature green to orange color-tunable upconversion (UC) luminescence has been achieved from Yb3+/Mn2+ co-doped CaO by adjusting the doping concentration of Mn2+ ions and the temperature of the samples upon 980 nm laser diode excitation. In this material system, the green UC emission band centered at 508 nm and the wavelength-tunable orange UC emission band from 560 to 725 nm are realized at 980 nm excitation, which originate from the cooperative luminescence of Yb3+ pairs and the |2F7/2, 4T1(4G)〉 → |2F7/2, 6A1(S)〉 transition of exchange-coupled Yb3+–Mn2+ dimers, respectively. The characteristic Stokes and UC emission properties, UC luminescence decay behaviors, temperature-dependent UC emission properties, as well as the involved UC mechanism of CaO:Yb3+,Mn2+ are investigated and discussed in detail. This study offers a new method to design novel UC materials for lighting and display applications instead of using conventionally investigated lanthanide (Ln3+) ions, such as Er3+, Tm3+ and Ho3+.
研究领域:
材料科学
·
光学
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高影响因子
危险品化学品经营许可证（带存储）