JOURNAL OF CRYSTAL GROWTH
·
2021
·
IF 1.797
Ming Ma,Bing Zhang,Weipeng Lu,Yihu Wang,Xiaofeng Cao,Yanchuan Guo
Calcium carbonate (CaCO 3 , CC) distributes diversely among the abiotic and biogenic minerals/biominerals. It has six phases (three anhydrous crystalline, two hydrates and one amorphous). Phase selectivity of the synthetic CC is of considerable interest and determines its physicochemical properties and destinated applications. In the present study the reactive crystallization process of CC has been subjected to the treatment of different disturbances, i.e., mechanical stirring (ms), ultrasonication (us), and composed ms + us at lower temperature (0 ± 1℃) and higher supersaturation condition (initial concentration of Ca 2+ is 0.1 M), in comparison with the quiescent condition. In order to gain insight on the role of these disturbances in controlling the crystallization process, nature, crystal habits of precipitated CC and their consecutive phase transformation, samples were collected at different time intervals (30 s, 1 min, 5 min, 10 min, 20 min, 45 min and 60 min) for investigation. Results reveals that these disturbing ways play a significant role on the CC crystallization process and can stabilize the amorphous calcium carbonate (ACC) phase for prolonged periods of time (1–60 min) in aqueous solution, which will be a powerful way for large-scale fabrication of pure ACC nanoparticles (about 100 nm) without addition of any chemicals. Longer disturbing time tends to transform the pure and spherical ACC nanoparticles competitively into spherical vaterite particles and rhombohedral calcite particles through the self-assembly of nanoparticles aggregation or Ostwald ripening mechanism, respectively. The investigation also suggested that the reactive crystallization of CC with the three disturbances undergoes a non-classical crystallization pathway to crystallize CC particles, in comparison with the quiescent reference condition. To the best of our knowledge, the report on reactive crystallization of CC crystallites as a function of different disturbances is first of its kind in the literature.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2015
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IF 3.088
Chengli Yao,Anjian Xie,Yuhua Shen,Jinmiao Zhu,Hongying Li
Nacre-like calcium carbonate nanostructures have been mediated by an ionic liquid (IL)-graphene oxide (GO) composite template. The resultant crystals were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray powder diffractometry (XRD). The results showed that either 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF 4 ) or graphene oxide can act as a soft template for calcium carbonate formation with unusual morphologies. Based on the time-dependent morphology changes of calcium carbonate particles, it is concluded that nacre-like calcium carbonate nanostructures can be formed gradually utilizing [BMIM]BF 4 /GO composite template. During the process of calcium carbonate formation, [BMIM]BF 4 acted not only as solvents but also as morphology templates for the fabrication of calcium carbonate materials with nacre-like morphology. Based on the observations, the possible mechanisms were also discussed.
研究领域:
材料科学
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化学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sulong Shi,Yuxi Zhang,Yue Pan,Xin Liu,Fuhong Zhang,Hongyuan Yang,Qingya Liu,Zhenyu Liu
Hydrogenation of calcium carbonate (CaCO 3 ) directly yields calcium oxide (CaO), carbon monoxide (CO) and methane (CH 4 ) with little dioxide ( CO 2 ) . It therefore is promising to retrofit the industries, such as the cement, refractory, calcium carbide and steel, that rely on CaCO 3 calcination for CaO but emit large amounts of CO 2 . To lower the hydrogenation temperature of CaCO 3 and to promote CH 4 production efficiency and selectivity this work investigates the catalytic effect of various nickel compounds on the CaCO 3 hydrogenation for CH 4 . Among the NiCO 3 , NiO, Ni 2 O 3 and Ni doped in CaCO 3 , NiCO 3 is the most active catalyst. It is hydrogenated to yield highly dispersed Ni in CaCO 3 at temperatures around 600 K, while the Ni catalyzes CaCO 3 hydrogenation for CH 4 at temperatures higher than 640 K, which are about 150 K lower than the non-catalytic CaCO 3 hydrogenation. The doping of 0.50% NiCO 3 converts 99.0% CaCO 3 to CH 4 . The catalytic CaCO 3 hydrogenation for CH 4 and CO can be modeled by the Shrinking core model (SCM) that shows activation energy ( E a ) of 110.0 kJ mol −1 for CH 4 production when 0.50% NiCO 3 is doped, which is lower than 211.9 kJ mol −1 for non-catalytic hydrogenation.
研究领域:
化学工程
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
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IF 5.065
Huiyan Xiong,Jiemin Chen,Tingting Zhang,Wenzhong Wang,Chengcai Huang,Yuling Zhu,Baowei Hu
In this investigation, the magnetic bio-CaCO 3 were synthesized and elimination of uranium and europium from aqueous solutions. The prepared magnetic composite underwent a series of characterization analyses, such as Transmission electron microscope (TEM), Scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), which prove that the magnetic particles are successfully modified on bio-CaCO 3. Surprisingly, it was found that coating the bio-CaCO 3 with Fe 3 O 4 not only increased the distance between the calcium carbonate nanosheets but also ensured the presence of Fe O active groups on the bio-CaCO 3 surface. The sorption of U(VI)/Eu(III) on the magnetic bio-CaCO 3 as a function of the pH, adsorbent dose, shaking time, co-existing ions, and the temperature was investigated using batch experiments. The effect of pH was investigated showing optimum sorption at pH 5 for U(VI) and Eu(III). The adsorption kinetics is relatively fast and can reach equilibrium in 60 to 90 min, and the pseudo-second-order rate equation preferentially fits the kinetic distribution, suggesting chemisorption was involved. The maximum adsorption amounts were 122.66 mg·g −1 for U(VI) and 130.62 mg·g −1 for Eu(III) at pH 5.0 and 298 K. The adsorption mechanism, which was evaluated with XRD, FTIR, SEM-EDS, and XPS, demonstrated that the functional groups (O H, -NH 2 , CO 3 2− and O Fe) and the increased hierarchical distances were primarily responsible for the improved adsorption ability. This paper highlights magnetic bio-CaCO 3 as potential, eco-friendly and ultrahigh-efficiency materials for uranium and europium pollution cleanup.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 10
·1432
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IF 2.7
Yuke Shen,Shuang Hao,Angqian Suonan,Yanxia Liu,Hangqi Li,Wei Ma,Lin Zhao,Yagang Zhang
Nano-micro calcium carbonate has a small particle size, uniform distribution, and good dispersion performance, offering great research value and development prospects. It has been widely used as a filler material for rubber, paper, ink, pigments, and coatings. Developing an efficient and controllable approach to preparing nano-micro calcium carbonate with adjustable morphology and controllable size has significant economic and environmental benefits. This study reports the controllable synthesis of nano-micro calcium carbonate meditated by additive engineering. The effects of various additives including inorganic acids, organic acids, alcohol, and surfactants on the particle size and morphology of the prepared materials were investigated. SEM, FT-IR and other characterization methods were used to analyze the prepared nano-micro calcium carbonate particle size, dispersion, and uniformity. The results showed that the particle size of calcium carbonate was 4~7 μm with a cubic structure. The particle size of calcium carbonate prepared by adding surfactant additives is in the range of 1~4 μm, and the crystal shape of calcium carbonate changes from calcite to vaterite after adding sodium dodecyl benzene sulfonate. With the aid of additives, the calcium carbonate particles dispersed more evenly. The mechanism of the controllable synthesis of nano-micro calcium carbonate mediated by additive engineering is elucidated and discussed. SDBS was found to be the best additive for preparing nano-micro calcium carbonate, and the synthesis conditions were explored and optimized.Keywords:calcium carbonate;additive;particle size and morphology;energy conservation
研究领域:
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
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Yuyang Zhao,Zhaoyang Sun,Gang Qiao,Xu Fang,Binmeng Chen
Given that CO 2 chamber and high inner pressure are needed in the traditional carbonation curing, we propose an in-situ internal carbonation by mesoporous silica nanoparticles (MSN) to tackle the challenge, leveraging its high specific surface area. In this study, MSN was functionalized with γ-aminopropyl triethoxy silane (MSN-amine), followed by reacting with CO 2 (CO 2 carrier) and mixing with alite paste. Phase transformation and nucleation behavior were investigated by conducting comparative in-situ carbonation of alite paste, utilizing MSN-amine in two configurations: one adsorbing CO 2 (MSN-amine-AC) and the other desorbing CO 2 (MSN-amine-DC). Results indicated that semi-crystalline C-S-H is produced in alite paste containing MSN-amine-DC (Ap-MSN-DC) through pozzolanic reaction while amorphous calcium carbonate (ACC) is generated in alite paste with MSN-amine-AC (Ap-MSN-AC) via in-situ carbonation, both of which promote the early reaction of alite. Additionally, low Ca/Si ratio calcium silicate hydrate (C-S-H) with negative electric potential developed as MSN-amine-DC gradually eroded, collapsed, and chemically transformed into reactive sites. Conversely, the ACC generated in MSN-amine-AC blocks the mesopores, inhibits the pozzolanic reaction and preserves the silica skeleton. Subsequently, calcite is crystallized via the dissolved ACC and embedded itself on the surface of C-S-H with positive electric potential, turning to nucleation sites physically. To conclude, the proposed in-situ internal carbonation models for MSN-amine-modified alite paste offer insights into microstructural evolution.
研究领域:
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Tao Shen,Jiawen Wu,Qingya Liu,Zhenyu Liu
Conversion of calcium carbonate (CaCO3) to calcium oxide and methane (CH4) by renewable hydrogen is promising to retrofit the current CaCO3 decomposition processes in many industries and, at the same time, to replace their carbon dioxide emission by CH4 generation. This work studies CaCO3 hydrogenation by a liquid organic hydrogen carrier, 9,10-dihydrophenanthrene (DHP), and the catalytic effect of nickel carbonate (NiCO3) at 400 °C. It is found that NiCO3 in situ forms Ni particles of 200–900 nm in size that promote CH4 formation from CaCO3. At the NiCO3:CaCO3:DHP molar ratios of 1:10:55 and 400 °C, the total CO32– conversion, CH4 selectivity, and CH4 formation from CaCO3 are 89.5, 40, and 80.3%, respectively, in 40 min.
研究领域:
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 12
·2071
·
IF 3.4
Ruijuan Sang,Fei Yang
Calcium carbonate (CaCO3) is a widely used inorganic filling pigment used in coatings, and it is known for its nontoxicity, odorlessness, and environmental friendliness. The application of CaCO3as a filler can effectively reduce raw material costs, and optimization of the filler formula enhances the coating film performance. In this study, oak planks were prepared as substrates for water-based inkjet printing. Three composite water-based primers with different TiO2-to-CaCO3ratios and a polyurethane resin primer were used to prepare the substrate for the printing surface. The properties of the water-based primer coating and the water-based inkjet printing coating were characterized and analyzed via Fourier-transform infrared spectroscopy, video-based contact angle analysis, and environmental scanning electron microscopy. The aim was to investigate the effects of the composite waterborne primer coatings on the ink absorption and coloring properties of the interface between wood substrates and waterborne inkjet coatings. Sample WDCC-3#, with a TiO2-to-CaCO3ratio of 15:35, exhibited the most comprehensive characteristics. The wood surface coated with 15 g/m2of the polyurethane resin primer and 15 g/m2of WDCC-3#exhibited a 5.8° contact angle of the water-based ink, first-grade adhesion, 4 H hardness, 70.52 whiteness value, and a roughness of ~2.33. The surface of the printed water-based inkjet-coated substrate was uniform and smooth, featuring rounded and transparent edges of the water-based ink droplets and a small CMYK color difference value. Therefore, the composite waterborne primer, incorporating TiO2and CaCO3in specific ratios, can be effectively combined with waterborne polyurethane primer coatings. This combination significantly improves the interfacial compatibility between the oak surface and waterborne inkjet coatings, leading to enhanced ink absorption on the oak plank surface during printing. This results in a high degree of color reproduction and clearer printed images. Overall, this study provides valuable insights for the development of primer programs for the industrial application of waterborne digital inkjet technology on wood products.Keywords:waterborne primer;calcium carbonate;water-based ink;oak plank;inkjet printing technology
研究领域:
材料科学
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木材科学与技术
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Renlu Liu,Jialiang Zhang,Haiyun Fu,Li Yin,Yongsheng Song,Genhe He
Efficient removal of organic dye pollution from contaminated water is a concern in the absorbent applications. In this study, a green biogenic calcium carbonate (BCC) absorbent was fabricated using Bacillus licheniformis for the removal of methylene blue (MB) from water. This was found to have superior adsorption capacity compared with abiotic calcium carbonate (ACC) and operate within a broad pH range from 3 to 9. MB adsorption on BCC was physical and exothermic. The hydrophobic features, rough nanoporous microstructure, and organic–inorganic mesoporous structure of the BCC may all be responsible for its favorable adsorption mass transfer. The adsorption energy of BCC had a more negative value than that of ACC, indicating a stronger MB interaction with BCC with a lower energy barrier. Hydrogen bonding and electrostatic attraction were involved in the adsorption process. Overall, the findings established a theoretical foundation for the application of BCC in remediation of MB-contaminated water.
研究领域:
环境科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Jun Liao,Congcong Ding,Junping Shi,Liang Jiang,Qiuyi Wang,Lielin Wang
The application of chitosan-based materials for the separation of uranium from wastewater was limited due to the lack of active sites. In this work, a chitosan-based composite (CaCO3@aCS/PA) was effectively created by modifying chitosan with CaCO3 and phytic acid to enhance the adsorption performance of chitosan materials. CaCO3@aCS/PA showed no significant changes and no Ca2+ was detected in the solution after stirring for 10 h in a solution with pH > 3, indicating good stability of CaCO3@aCS/PA, which was beneficial for use in adsorption. Moreover, the adsorption capacity and adsorption percentage of CaCO3@aCS/PA for uranium reached 842.0 mg/g (298 K, pH = 4) and 95.4% (C0 = 10 mg/L, pH = 4) and the adsorption equilibrium time was significantly shortened, indicating that the modification with CaCO3 and phytic acid enhanced the adsorption ability of chitosan for uranium, which was related to the synergistic effect of various active sites (CO32–, PO43–, −OH, and –NH2) on CaCO3@aCS/PA for uranium adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Jianjun Wang,Wenheng Li,Zihan Zhou,Zhiyong Gao,Yuehua Hu,Wei Sun
Fluorite is usually separated from calcite by froth flotation method using large amounts of sodium silicate depressant, which can cause trouble in the loss of fluorite and wastewater treatment. In this study, green and low-cost 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP or H 4 L) was used as pH-dependent switch to initially depress fluorite for calcite pre-removal at pH 6.0, and then activate fluorite for further upgrading fluorite concentrate at pH 8.0. The depressing behavior and mechanism were reported in this work. H 2 L 2− was the dominant form of HEDP, and a stronger chemical adsorption of H 2 L 2− on fluorite hindered the subsequent adsorption of sodium oleate (NaOL), while that of the calcite showed the opposite result. Two active O atoms in H 2 L 2− could well match in interatom distance with two Ca sites on fluorite to form Ca-H 2 L complexes. The pH-dependent switch reagent reported here may open a new avenue for more selective separation among mixed mineral systems.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Lei Wang,Zeen Yv,Licheng Ma,Qi Zheng,Tong Wang,Xiaokui Che,Xinglan Cui,Hongxia Li,Shenyv Wei,Xinyue Shi
Calcium carbonate is a common natural mineral with a wide range of applications. In this study, hollow calcite microspheres were successfully synthesized by using calcium chloride and sodium carbonate as raw materials in an SDS–PEG system. The results suggested that the appropriate concentration of SDS is necessary during the spherical crystallization of calcium carbonate. It was found that the crystals started to aggregate under the effect of SDS, and aggregation was enhanced with an increase in SDS concentration, leading to the transformation from hollow to solid microspheres. However, high temperatures will lead to the transformation from calcite to aragonite, resulting in the collapse of the formed spherical structure. Infrared spectroscopy and conductivity analysis suggested that when the concentration of SDS reached 0.3 g/L in the PEG–SDS system, SDS and PEG formed a spherical supramolecular structure. This structure could act as a template, leading to the aggregation of calcite through electrostatic attraction and finally to the formation of a hollow spherical structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）