MINERALS ENGINEERING
·
2024
·
IF 4.9
Shengzong Lan,Liuyang Dong,Peilun Shen,Haoran Su,Zhengchang Shen,Dianwen Liu
A large amount of the industrial byproduct gypsum can harm the environment, so developing an innovative approach for the utilization of gypsum is highly important. In this study, gypsum was employed to increase the flotation separation efficiency of apatite from calcite. The micro-flotation test revealed that sodium oleate could not separate the two minerals without a depressant. At pH 9, following the incorporation of gypsum, apatite achieved a recovery of 83.22 %, which was 51.49 % greater than that of calcite. The artificial mixed mineral test yielded a mixed concentrate with a P 2 O 5 recovery of 72.71 % and a grade of 25.88 %. Mineral surface properties were analyzed, revealing that gypsum enhanced the hydrophilicity of the calcite surface and inhibited NaOL adsorption on calcite but had a minimal impact on apatite. Ca 2+ in the slurry facilitated SO 4 2– adsorption on the calcite surface. X-ray photoelectron spectroscopy results indicated that phosphate species on the apatite surface could adsorb Ca 2+ from the solution, creating active sites for sodium oleate. Additionally, a higher concentration of S was observed on the calcite surface, suggesting that the adsorption capacity of gypsum dissolved in the slurry is greater on the surface of calcite. Surface morphology analysis revealed selective gypsum dissolved components adsorption on calcite rather than apatite, primarily within the 8–30 nm range, exhibiting uniform spot adsorption. These findings demonstrate the potential of gypsum as an inorganic depressant for calcite from various sources, enabling the flotation separation of apatite from calcite and thus providing a theoretical basis for the resource utilization of gypsum solid waste.
研究领域:
矿物加工工程
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环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2020
·
IF 5.88
Tingyu Yang,Jilagamazhi Fu,Liang Ma,Hong Du,Xiaoqing Yue,Bosheng Zhao,Cuiyan Wang
In biomineralization, organisms have the abilities to produce biominerals with superior properties. One of the most attractive features of biominerals is the presence of the proteins consisting of different contents of amino acids in crystals. In the present work, L-phenylalanine (Phe) was used as an additive for the controllable crystallization of calcium carbonate (CaCO 3 ). The obtained CaCO 3 crystals were characterized by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), elemental analysis and high-resolution transmission electron microscopy (HRTEM). The experimental results suggest that single calcite crystals are formed at low Phe concentrations. High concentrations of Phe inhibit the nucleation and growth of calcite, and promote the formation of vaterite crystals with solid or hollow structures. The morphology and crystal form of CaCO 3 are also significantly affected by the flow rate of CO 2 . After that, a possible mechanism (competition mechanism) action of Phe in the formation of CaCO 3 is proposed. Finally, the effects of temperature on the formation of vaterite were determined to explore the growth mechanism of hexagonal vaterite. The work of controlling the preparation of CaCO 3 crystals in the presence of Phe will help us to imitate and learn nature, and bring new insights into understanding bionics. Meanwhile, it provides a new method for the synthesis of CaCO 3 biomaterials with different crystal forms and morphologies.
研究领域:
材料科学
·
生物矿化
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Chao Song,Hua-Yu Liu,Shuang Guo,Shu-Guang Wang
As the most typical geological environment, limestone landforms are widespreading in the world and affect the waters that flow around them, which may also change the fate of organic contaminants in these waters. In this study, aquatic environment surrounding limestone was simulated with calcium carbonate , and the photolysis of tetracycline was evaluated under UV irradiation (30 μW/cm 2 ). More tetracycline (up to 98%) was removed in 4 h in the presence of calcium carbonate while only 50% of tetracycline was eliminated in control experiment. The removal of tetracycline was greatly enhanced due to the major roles of alkaline pH and minor roles of Ca 2+ and HCO 3 − /CO 3 2− . In alkaline pH, tetracycline existed as TCs − with higher electronic density in the ring structures, which was more easily attacked by OH. Besides, it could also change the bond orbital energy to facilitate tetracycline absorbing more photon. Moreover, alkaline pH was beneficial to generate more OH and thus promote the indirect photolysis. In addition, alkaline pH also changed the degradation path of tetracycline and rapidly convert tetracycline to the byproducts with m/z 457 via hydroxylation and hydrogen abstraction. This work provides not only better understanding about the fate of tetracycline in aquatic environments but also new insights into the treatment of antibiotic-contaminated water.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 40
·7200-7215
·
IF 3.756
Ningjing Song,Jiangfeng Li,Baosheng Li,Ercai Pan,Juan Gao,Yurong Ma
The shells of P. placenta are composed of foliated calcite laths packed as layered structures and have high mechanical properties and optical transparency. However, the biomineralization mechanism and the influence of the organic matrix on the formation of the foliated calcite laths in the shells of P. placenta are not known. The acid-soluble matrix (ASM) was extracted from the shells of P. placenta and characterized in detail. Sixteen proteins including calcium-binding and chitin-binding proteins were associated to shell formation via proteome analysis of ASM. The ASM was found to be enriched with Gly, Asp and Ser. By tracking the Ca2+ concentration in the solution in the presence of ASM by a potentiometric method, we find that the ASM has a strong effect to stabilize the amorphous calcium carbonate (ACC) precursor in solution with a nucleation time of about 7733 s and a retardation factor of about 2.3, while the concentration of the ASM was 0.3 μg mL−1. In particular, the ASM can inhibit the (secondary) nucleation of calcium carbonate for 10 and 24 hours on the shell surfaces of P. placenta and the glass substrate in the aqueous solution, respectively. An explosive secondary nucleation and quick crystal growth from 50 nm to 10 μm can be finished on the shell surfaces in one hour, in between 10 h and 11 h of reaction time, via a gas diffusion process. This indicates that the ASM has a very strong effect to stabilize ACC and inhibit nucleation. The formation of ACC in the solution and its transformation to calcite crystals on the substrates were tracked by dynamic light scattering, selected-area electron diffraction, infrared spectroscopy, scanning electron microscopy, and confocal laser scanning microscopy. It was found that the ASM was doped in the preliminary nanocrystals with a size of about 50–100 nm, which were formed on the shell surfaces via secondary nucleation, and was occluded into the calcite crystals without preferred adsorption on particular crystal planes. The calcite crystals formed on the shell surfaces became more and more rounded and lost {104} planes with increasing concentration of the ASM in the solution, indicating that the ASM can stabilize other planes instead of the thermodynamic {104} planes. The in vitro crystallization study in this work shows that ASM extracted from the shells of P. placenta has a strong effect on the biomineralization process of foliated calcite laths of P. placenta.
研究领域:
生物矿化
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材料科学
·
海洋生物学
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蛋白质组学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Xiaochun Ma,Zhaodong Zhu,Haichuan Zhang,Shenglong Tian,Xiaohong Li,Huiming Fan,Shiyu Fu
Deacidification and surface self-cleaning are of great significance for the long-term preservation of historic literature. Herein, a superhydrophobic self-cleaning coating, derived from nanocellulose coated with CaCO 3 particles is constructed via chemical vapor deposition (CVD) for the first time for the preservation of historic paper. The static contact angle of superhydrophobic paper reached more than 150° and the minimum sliding angle was 6.4°. Deacidification effect was achieved with a desired pH value in the range from 7.50 to 7.77 and the maximum alkali storage was up to 1.235 mol/kg. It is found that the low-cost CaCO 3 nanoparticles can not only remove the acid substances, but also gave the paper function of self-cleaning, which is very great significant for the protection of paper-based relics.
研究领域:
材料科学
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文物保护科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2022
·Vol. 10
·期 5
·2205989
·
IF 17.521
Qiao Yu,Baihai Su,Weifeng Zhao,Changsheng Zhao
Uncontrolled hemorrhage is a major cause of potentially preventable death in civilian trauma nowadays. Considerable concern has been given to the development of efficient hemostats with high blood absorption, self-propelled property, and Ca 2+ release ability, for irregularly shaped and noncompressible hemorrhage. Herein, Janus self-propelled chitosan-based hydrogel with CaCO 3 (J-CMH@CaCO 3 ) is developed by partial ionic crosslinking of carboxylated chitosan (CCS) and Ca 2+ , gravity settlement, and photopolymerization, followed by removing the shell of CCS. The obtained J-CMH@CaCO 3 is further used as a hemostat powered by the internal CaCO 3 and coordinated protonated tranexamic acid (J-CMH@CaCO 3 /T). Bubbles are generated and detached to provide the driving force, accompanied by the release of Ca 2+ . The two aspects work in synergy to accelerate clot formation, endowing the J-CMH@CaCO 3 /T with excellent hemostatic efficiency. The J-CMH@CaCO 3 /T presents high blood absorption, favorable blood-clotting ability, desired erythrocyte and platelet aggregation, and acceptable hemocompatibility and cytocompatibility. In rodent and rabbit bleeding models, the J-CMH@CaCO 3 /T exhibits the most effective hemostasis to the best knowledge of the authors, wherein the hemorrhage is rapidly halted within 39 s. It is believed that the J-CMH@CaCO 3 /T with self-propelled property opens up a new avenue to design high-performance hemostats for clinical application.
研究领域:
生物医学工程
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材料科学
·
创伤医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1431
·
IF 3.236
Han Yan,Xin Shu,Dongliang Zhou,Yong Yang,Lu Chen,Qianping Ran
The durability of cementitious materials is significant concerning long-term performance. Nanomaterials are promising candidates for deep refinement of cement durability. Hydrophobic calcium carbonate is a widely applied and easily accessible nanomaterial. However, its hydrophobicity and poor dispersity in water prohibit its direct application in cementitious materials. In this study, hydrophobic calcium carbonate nanoparticles (HbCC) were modified using a novel amphiphilic comb-shaped dispersant that is capable of laurinol release. The modification was conducted to improve the dispersity of HbCC and their compatibility with hydration products. The dispersion-improved calcium carbonate particles (AmphCC) were characterized and tested for cement durability improvement performance. According to the results, the AmphCC particles showed a pronounced effect on improving permeation resistance of cement mortars, with water absorption and chloride penetration considerably lowered. Moreover, the introduction of AmphCC in cement did not show significant adverse effects on strength development. Compared with AmphCC, a single addition of the unmodified HbCC and the dispersant cannot achieve equivalent effects. The superior effect of AmphCC is due to the synergistic effect of good particle dispersion and controlled release of the hydrophobic molecules, which is achieved by dispersion of HbCC with binding of the dispersant.Keywords:cement;durability;nano calcium carbonate;amphiphilic dispersant
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 21
·2300195
·
IF 2.5
Xiuling Lin,Jiali Shi,Ge Meng,Chen Yu
Sodium alginate (SA) hydrogels crosslinked by calcium carbonate (CaCO 3 ) and gluconolactone (GDL) are prepared and characterized by X-ray diffraction (XRD) analysis and Fourier transform infrared (FTIR) spectrometry. The morphologies of the gel are observed with scanning electron microscopy (SEM). The SA hydrogels are used as carriers of the anti-inflammatory drug ibuprofen (IBU). The effects of GDL content, pH value, and temperature on IBU release behavior are investigated and associated kinetic analysis is performed. The results show that the cumulative release of IBU shows a trend of increasing and then decreasing with increased GDL content. The maximum cumulative release is observed when the molar ratio of calcium ions (Ca 2+ ) in CaCO 3 to GDL is 0.6. The release behavior of IBU is observed to be influenced by pH levels, and it exhibits an optimal release trend at a pH value of 7.4. The impact of temperature on the release behavior of IBU is relatively insignificant compared to other factors. The Korsmeyer–Peppas release kinetic model is well fitted and suitable to explain the release behavior of IBU from the sodium alginate hydrogel.
研究领域:
药剂学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2019
·Vol. 9
·期 4
·254
·
IF 2.25
Lvshan Zhou,Tongjiang Peng,Hongjuan Sun,Xiaogang Guo,Dong Fu
A precipitation reaction method was employed to prepare mesopore calcium carbonate (CaCO3) using rape flower pollen as the template. CaCO3adsorbent was characterized using X-ray diffraction (XRD), scanning electronic microscopy (SEM), and Brunner−Emmet−Teller measurements (BET). The equilibrium adsorption data on amoxicillin were explained using Langmuir, Freundlich, and Temkin adsorption isotherm models. The pseudo-first order, second order, pseudo-second order, and intra-particle diffusion kinetic models were used to explore adsorption kinetics. Equilibrium adsorption of as-prepared CaCO3was better depicted using the Langmuir adsorption model with an R2of 0.9948. The separation factor (RL) was found to be in the range of 0
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
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 6
·3471-3478
·
IF 1.093
Wang Feng,Ge Hong-Hua,Wu Kai,Wang Le-Tian,Wan Chuan,Sha Jun-Yi,Zhao Yu-Zeng
The effects of Al2O3 nanoparticles on the precipitation behavior of CaCO3 and on the anti-scale performance of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) in CaCO3 growth solution were studied by means of solution analysis, gravimetric
methods, scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The results illustrate that Al2O3 nanoparticles had little effect on the concentration of calcium ions in the test solution without PBTCA, but significantly changed the
form and morphology of calcium carbonate crystals, which were transformed from calcite to aragonite. As a commonly used and effective scale inhibitor, PBTCA showed good Ca2+ retention ability in the test solution, distorting the calcite crystal lattice and promoting the formation
of vaterite. When Al2O3 nanoparticles co-existed with PBTCA in the test solution, calcium carbonate was more likely to precipitate, and the Ca2+ retention ability of PBTCA reduced. A newly designed gravimetric method was used to evaluate the scale inhibition
performance of Al2O3 nanoparticles on the heat exchange surface. When the concentration of Al2O3 nanoparticles reached 1 g/L, the surface scale inhibition efficiency of Al2O3 nanoparticles exceeded 80%.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Xiangyu Dou,Haoyang Huang,Yongsheng Han
Nucleation widely exists in nature, from cloud formation to haze generation. The classical nucleation theory (CNT) was created to describe the nucleation process, but it fails to predict many experimental phenomena due to the short consideration of nanoscale phenomena and macroscale dynamics. Although the attachment and detachment of monomers are considered in the developed model of nucleation, the diffusion of chemicals in the bulk is not valued as supersaturation in the nucleation process so far. Here we employ simulation and experimental approaches to investigate how the diffusion of ions affects the nucleation of calcium carbonate. The diffusion of ions is regulated by the viscosity of solvents and the sonication imposed on the solution. It is found that the nucleation rates increased exponentially with the diffusion coefficient of ions, which is beyond the prediction of CNT. This abnormal finding might be ascribed to the involvement of cluster aggregation in the nucleation of calcium carbonate. This study highlights the significance of chemical diffusion in the nucleation process, which may help to revise the nucleation theory and develop solutions for the rational synthesis of materials, as well as for the control of air pollution.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2022
·Vol. 8
·期 5
·322
·
IF 4.432
Zhichuan Tang,Zhengsong Qiu,Hanyi Zhong,Hui Mao,Kai Shan,Yujie Kang
Filtration loss control under high-temperature conditions is a worldwide issue among water-based drilling fluids (WBDFs). A core–shell high-temperature filter reducer (PAASM-CaCO3) that combines organic macromolecules with inorganic nanomaterials was developed by combining acrylamide (AM), 2-acrylamide-2-methylpropane sulfonic acid (AMPS), styrene (St), and maleic anhydride (MA) as monomers and nano-calcium carbonate (NCC). The molecular structure of PAASM-CaCO3was characterized. The average molecular weight of the organic part was 6.98 × 105and the thermal decomposition temperature was about 300 °C. PAASM-CaCO3had a better high-temperature resistance. The rheological properties and filtration performance of drilling fluids treated with PAASM-CaCO3were stable before and after aging at 200 °C/16 h, and the effect of filtration control was better than that of commonly used filter reducers. PAASM-CaCO3improved colloidal stability and mud cake quality at high temperatures.Keywords:filtration reducer;high temperature;water-based drilling fluid;nanomaterials;calcium carbonate
研究领域:
化学工程
·
材料科学
✓ 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）