JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Shilin Diao,Mengfang Li,Xuan Liu,Yujia Liu,Qingjin Shang,Yewei Xu
A hybrid material , Ca/Mg-MOF/polyamidoxime (Ca/Mg-MOF/PAO), was synthesized and tested for uranium(VI) uptake in solution. The structure and performance of Ca/Mg-MOF/PAO were comprehensively investigated. Adsorption experiments demonstrated that Ca/Mg-MOF/PAO exhibited an extraordinary saturation capacity of 579.5 mg/g for uranium (VI) at pH = 8, surpassing that of most other adsorbents. The adsorption process of Ca/Mg-MOF/PAO on uranium (VI) conformed to Langmuir and PSO models, suggesting chemical rate control and monolayer adsorption, respectively. Furthermore, Ca/Mg-MOF/PAO displayed excellent adsorption-desorption recovery performance for uranium (VI). Its high adsorption capacity and efficient recoverability position Ca/Mg-MOF/PAO as a material with great potential for extracting uranium (VI) from aqueous media.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Materials Research Express
·
2022
·Vol. 9
·期 6
·065505
·
IF 2.025
Qinghong You,Xiulian Yin,Jun Wang,Chunhua Dai
A recyclable heterogeneous KF/Ca-Mg-Al-O catalyst was prepared by co-precipitation and calcination processes. The characteristics of the catalyst were investigated using FTIR, XRD, TG-DTG and SEM. Response surface methodology was utilized to obtain the best most extreme biodiesel production yield. The ideal biodiesel production conditions were: the amount of catalyst was 3 wt%; the reaction temperature was 65 °C; the alcohol oil molar ratio 9.8:1, the reaction time was 3.5 h. Under these amended conditions, the average biodiesel yield was 95.19%, which is well in close concurrence with the worth anticipated by the model. The repeatability of catalysts was studied. After using the catalyst seven times, the catalytic efficiency was only reduced by 2.7%. These results indicate that the catalyst has good catalytic efficiency and is recyclable.
研究领域:
化学工程
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能源科学
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2022
·
IF 8.129
Jida Wang,Feng Shi,Can Liu,Yi Lu,Xu Lin,Defa Hou,Jirong Li,Dechao Wang,Zhifeng Zheng,Yunwu Zheng
In this study, a series of cost-effective and eco-friendly Ca-Mg-Al and Ni-modified Ca-Mg-Al catalysts were successfully synthesized with different methods (coprecipitation, impregnation and mechanical mixing method) and applied to catalytic pyrolysis vapor upgrading of oleic acid (OA) to produce gasoline-kerosene rich production using methanol as a hydrogen donor . In addition, the effects of the process parameters (catalyst type, OA to methanol ratio, pyrolysis/catalytic temperature, catalyst loading, feedstock injection volume) on the product yield and selectivity were explored, and the reuse properties and deactivation mechanism were also evaluated. Active Ni species coupled with methanol were more conducive to enhancing the catalyst activity and OA conversion and obviously increased the selectivity toward the gasoline-kerosene product. The impregnation method was favorable for the formation of NiAl 2 O 4 species, and coprecipitation method suppressed the formation of NiAl 2 O 4 species. The enhanced activity and deoxygenation selectivity of the coprecipitation method (NiCaMgAl) at lower pyrolysis temperatures was attributed to the abundant higher specific surface area and pore size, higher active metal oxide (Ni 2+ ) and well-active Ni dispersion with a smaller particle size, as well as the lower acidity and partially oxidized Ni, which suppressed the NiAl 2 O 4 spinel phase formation compared with the Ni/Ca-Mg/Al (impregnation) and Ca-Mg-Al (mixing) catalysts, which was beneficial to the decarbonylation/ decarboxylation reaction and inhibited the hydrocracking reaction of C C. Therefore, 100% conversion, 97.12% hydrocarbon yield, 54.53% gasoline and 58.80% kerosene content over NiCaMgAl catalyst were obtained under optimal conditions (pyrolysis/catalytic temperature = 450/500°C, catalyst loading = 1.5 g, feedstock injection volume = 0.1 ml/min and OA to methanol ratio = 3:1). Moreover, NiCaMgAl catalyst also demonstrated good reusability and hydrothermal stability performance due to the lower amount of coke deposition with a lower graphitized structure, which suppressed sintering.
研究领域:
化学工程
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催化剂科学
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2017
·
IF 3.101
Ning Mao,Chun Hui Zhou,John Keeling,Saverio Fiore,Hao Zhang,Liang Chen,Gui Chen Jin,Ting Ting Zhu,Dong Shen Tong,Wei Hua Yu
Dolomite is a widespread carbonate mineral that has been investigated extensively over the past two centuries. Despite the high level of investigation, aspects of the environmental conditions of crystallization, diagenesis and dissolution remain elusive and the transformation of dolomite into other value-added products is still challenging. This work shows a novel, cleaner method to dissolve dolomite by taking advantage of the acidity from the hydrolysis of Lewis acid AlCl 3 and as such the mineral can be efficiently converted into Ca-Mg-Al layered double hydroxide (LDH). The dolomite and the resulting Ca-Mg-Al LDH samples were characterized by powder X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The composition of the products was measured by energy dispersive spectrometer-mapping (EDS-mapping), X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS). Particle sizes of the products were measured by a dynamic light scattering method. It is documented, for the first time, that dissolution of dolomite in AlCl 3 aqueous solution is facilitated by hydrothermal treatment . Well-crystallized Ca-Mg-Al LDH crystals are achieved under (Ca + Mg): Al molar ratio = 1:1, pH = 10.5 via a simple co-precipitation method. The maximum utilization efficiencies of Ca 2+ , Mg 2+ from dolomite to LDH are 36.3% and 95.5%, respectively. The possible mechanisms of LDH formation were: 1) the dolomite dissolved in the strong acid solution due to the hydrolysis of AlCl 3 and thus provided Ca 2+ and Mg 2+ ; 2) with addition of NaOH, Al 3+ cations precipitated to form Al(OH) 3 (at 8.3 ≤ pH ≤ 9.3) and then part of the Al(OH) 3 reacted with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH; 3) at pH = 10.5, the Al(OH) 3 was transformed as [AlO(OH)] and meanwhile Ca 2+ , Mg 2+ and Al 3+ took part in the formation of Ca-Mg-Al LDH; 4) when pH = 10.6, [AlO(OH)] reacted with NaOH to dissolve into [Al(OH) 4 ]− and the [Al(OH) 4 ]− finally co-precipitated with Ca 2+ and Mg 2+ to form the Ca-Mg-Al LDH during heating for drying.
研究领域:
材料科学
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矿物加工
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无机化学
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环境地球化学
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湿法冶金
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DOI
高影响因子
Sustainability
·
2025
·Vol. 17
·期 11
·5049
·
IF 3.3
Qi Wang,Guanghui Zhuo,Dongxin Xue,Guangcan Zhu,Chu-Ya Wang
Elevated phosphorus levels in aquatic ecosystems have been identified as a critical driver of eutrophication processes, necessitating resource-recovery remediation strategies. Adsorption techniques show particular promise for nutrient recovery due to their selective binding capacities and operational feasibility. In this study, the Mg- and Ca-modified biogas residue-based biochar (Ca-Mg/BC) was successfully prepared via a “bimetallic loading-pyrolysis” modification strategy. The optimum temperature for the calcination of the material and the salt solution impregnation concentrations were determined experimentally through optimization of the synthesis conditions. Structural and chemical analyses of Ca–Mg/BC demonstrated that the material contains MgO and CaO. The specific surface area of Ca–Mg/BC was 8.49 times higher than that of the unmodified biochar (BC). The optimized Ca–Mg/BC achieved 95% phosphate removal rate (157.13 mg/g adsorption capacity). FTIR and XPS characterization results indicated the importance of Ca/Mg loading in phosphate capture. MgO and CaO were mainly loaded on the surface of the material and adsorbed phosphate through a chemical reaction. Crucially, the phosphate-laden biochar exhibited potential as a nutrient-enriched soil amendment, opening the material loop from wastewater treatment to agricultural applications. This sustainable strategy simultaneously addresses water pollution control and sustainable development, providing environmentally benign solutions compatible with industrial effluent treatment and sustainable agriculture practices.
研究领域:
环境科学
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材料科学
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农业资源利用
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DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Dong-Ni Shen,Yue-Dan Xu,Cheng He,Zi-Huai Zhou,Hai-Hua Zhu,Ying Shi,Meng-Fei Yu,Jian Hu,Bai-Ping Fu
Magnesium ions are highly enriched in early stage of biological mineralization of hard tissues. Paradoxically, hydroxyapatite (HAp) crystallization is inhibited significantly by high concentration of magnesium ions. The mechanism to regulate magnesium-doped biomimetic mineralization of collagen fibrils has never been fully elucidated. Herein, it is revealed that citrate can bioinspire the magnesium-stabilized mineral precursors to generate magnesium-doped biomimetic mineralization as follows: Citrate can enhance the electronegativity of collagen fibrils by its absorption to fibrils via hydrogen bonds. Afterward, electronegative collagen fibrils can attract highly concentrated electropositive polyaspartic acid-Ca&Mg (PAsp-Ca&Mg) complexes followed by phosphate solution via strong electrostatic attraction. Meanwhile, citrate adsorbed in/on fibrils can eliminate mineralization inhibitory effects of magnesium ions by breaking hydration layer surrounding magnesium ions and thus reduce dehydration energy barrier for rapid fulfillment of biomimetic mineralization. The remineralized demineralized dentin with magnesium-doped HAp possesses antibacterial ability, and the mineralization mediums possess excellent biocompatibility via cytotoxicity and oral mucosa irritation tests. This strategy shall shed light on cationic ions-doped biomimetic mineralization with antibacterial ability via modifying collagen fibrils and eliminating mineralization inhibitory effects of some cationic ions, as well as can excite attention to the neglected multiple regulations of small biomolecules, such as citrate, during biomineralization process.
研究领域:
材料科学
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生物材料
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生物矿化
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牙科材料
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组织工程
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xingyu Wu,Xinyu Zhang,Yumei Xian,Yan Liu,Ling Luo,Lilin Wang,Chengyi Huang,Chao Chen,Jinsong He,Yanzong Zhang
The combination of polysaccharides can obtain stable, degradable, and environmentally friendly hydrogels, which have broad application prospects in adsorbents assembly. With Ca 2+ and Mg 2+ as crosslinkers, a new pectin/Konjac glucomannan/Ca-Mg composite hydrogel was prepared for phosphate adsorption by the alkali-thermal co-reaction method. Since Mg(OH) 2 can create a suitable pH condition for phosphate adsorption by Ca, Ca and Mg synergistically promoted phosphate adsorption and remained stable in the pH range of 4 to 10. FTIR, SEM-EDS, XRD, XPS , and zero potential analysis corroborated that the hydrogel used Ca and Mg as active sites to trap pollutants by electrostatic adsorption and fix phosphate through complexation to form Mg 3 (PO 4 ) 2 ·8H 2 O and CaPO 3 (OH) 2 ·H 2 O. Furthermore, it is unnecessary to separate the recovered phosphate from the hydrogel, and it can be used directly as a fertilizer. By being reused in the soil, it promoted seed germination and seedling growth. This adsorbent has the potential for recovery as a phosphorus-containing organic fertilizer after phosphorus adsorption.
研究领域:
环境科学
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材料科学
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农业科学
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产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2024
·
IF 5.5
Yueyue He,Huaigang Cheng,Zihe Pan,Xiangping Zhang
Heterogeneous catalysts can avoid the problem of difficult separation and recovery of homogeneous catalysts in transesterification reactions, but there is a lack of basis for process optimization because the quantitative influence mechanism of supports is not clear. In this work, we firstly attempt to make a comprehensive comparation on the effect of potassium fluoride (KF) catalysts on various supports (carbonates and oxides of cerium, magnesium and calcium) on the transesterification reaction, especially on the kinetics. According to the results, oxide-supported catalysts are significantly more active than carbonate-supported catalysts because they have more active sites. When oxides were used as supports, KF/MgO exhibited good activity because of its stronger basicity and higher number of active sites on the surface. Under the same process conditions, the stability time of KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction was 240 min, 90 min and 30 min, respectively. KF/MgO achieved a conversion of 68.0 %. The activation energies of the KF/CeO 2 , KF/CaO and KF/MgO catalysed transesterification reaction were 22.22 kJ/mol, 15.93 kJ/mol and 15.80 kJ/mol, respectively. The surface alkalinity of KF/MgO increased the frequency of molecular collisions of the reactants and exhibited a faster reaction rate.
研究领域:
催化化学
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材料科学
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反应工程学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 48
·2507563
·
IF 19
Ke Su,Lefu Mei,Zunqi Liu,Xin Pan,Pengfei Shuai,Jiyang Xie,Bin Ma,Qingfeng Guo,Cunjian Lin,Mingxing Chen,Zhijian Peng,Libing Liao,Wanbiao Hu,Guocheng Lv
Balancing sensitivity and detection range in dynamic pressure monitoring materials remains challenging, with commercial ruby (Al 2 O 3 :Cr 3+ ) sensors limited by strong crystal fields, restricting performance under extreme conditions. Here, an innovative strategy utilizing an ordered-to-disordered structural conversion in Cr 3+ doped Ca(Mg,Sc)(Al,Si)O 6 phosphors is introduced. This approach achieves a remarkable blueshift sensitivity of 15.08 nm GPa −1 –2.8 times higher than ordered structures and 41 times higher than commercial sensors while maintaining a broad detection range up to 7.5 GPa. Moreover, enhanced structural rigidity notably improves luminescence intensity and thermal stability. The findings establish a robust paradigm for designing high-performance optical pressure sensors, significantly addressing the traditional trade-off between sensitivity and detection range, showing promising applications in geological exploration and aerospace fields.
研究领域:
材料科学
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光学传感器
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高压物理
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发光材料
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Yunhui Li,Zuoying Cao,Xiwen Zhang,Jialin Qing,Mingyu Wang,Qinggang Li,Shengxi Wu,Xinsheng Wu,Wenjuan Guan,Guiqing Zhang
Efficient recovery of nickel, cobalt, and manganese from Ca- and Mg-rich sulfate leachates is essential for battery-grade precursor production. A synergistic solvent extraction (SSX) system combining N,N-bis(4-thiazolylmethyl)octylamine (NNBT) with acidic organophosphorus extractants was developed to achieve coextraction of Ni, Co, and Mn. Among various combinations, the D2EHPA–NNBT system exhibited the highest selectivity and cost efficiency, enabling complete extraction of Ni, Co, and Mn while suppressing Ca and Mg transfer. Multistage countercurrent and scrubbing operations further reduced impurities, producing high-purity Ni–Co–Mn sulfate solutions suitable for battery applications. Thermodynamic and spectroscopic analyses confirmed that synergism originated from selective coordination and cation-exchange interactions. This study demonstrates a practical and scalable route for selective Ni–Co–Mn recovery from impurity-rich sulfate solutions, contributing to the efficient and sustainable hydrometallurgical processing of battery metals.
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产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2025
·
IF 6.2
Yilun Shui,Huiyu Liu,Rui Shan,Min Hao,Chengyu Li,Jun Zhang,Haoran Yuan
The present study proposes a promising strategy for selective pyrolysis of waste tire rubber particles into high-value limonene under the dual action of chemical pretreatments and basic Ca x Mg 1-x Al oxides. The experimental results demonstrate that chemical pretreatments of rubber particles significantly enhance limonene selectivity in pyrolysis products while effectively suppressing the generation of sulfur-containing compounds. Among the various pretreatments, the rubber particles pretreated with 1 wt.% sulfuric acid exhibits optimal performance, which achieves a relative limonene content as high as 35%. The introduction of Ca 0.3 Mg 0.7 Al substantially promotes the selective production of limonene that gives a maximum relative content of 46% in pyrolysis oils. Kinetic analysis confirms that the application of as-prepared Ca 0.3 Mg 0.7 Al greatly lowered the average activation energy from 245.8 kJ/mol to 217.5 kJ/mol for waste tire rubber particles pyrolysis. Moreover, the plausible reaction pathway for waste tire rubber particles pyrolysis under the action of chemical pretreatments and composite metal oxides was proposed. This study, through experiments under ideal laboratory conditions, clarifies the core mechanism of the synergistic regulation of limonene selectivity by chemical pretreatments and basic Ca x Mg 1-x Al oxides, and provides basic research support and technical development directions for the subsequent targeted conversion of industrial-scale waste tire rubber into high-value limonene-rich pyrolysis oils.
研究领域:
环境科学
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材料化学
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能源工程
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绿色化学
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资源循环利用
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热解技术
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Metallurgy
·
2026
·
IF 3.5
Zhu Linchao,Ge Yuanyang,Wang Lin,Yuan Peiqing,Xu Xinru,Yang Jingyi
The leaching behavior of metallic elements in steel slag during acetic acid treatment is critical for its application in carbon sequestration. X-ray fluorescence (XRF), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) characterized the content and morphology of major elements (Ca, Mg, Fe) in steel slag. The acid leaching kinetics of 3.2–5.0 mm steel slag in acetic acid was investigated via the fractal shrinking core model, where the introduction of fractal dimension improved the accuracy of describing leaching kinetics for large particles. Results showed that Ca 2+ and Mg 2+ leaching was dominated by ash-layer diffusion, while Fe 3+ leaching was controlled by surface reactions. Based on the surface zeta potential of steel slag, benzyltrimethylammonium chloride (TMBAC) was used to neutralize the anion shield layer, reducing ash-layer diffusion resistance and enhancing Ca 2+ and Mg 2+ leaching rates. Optimization of reaction parameters yielded a maximum Ca 2+ leaching rate of 61.51%. This study provides a basis for enhanced approaches to utilizing steel slag in processes requiring metal extraction, such as carbon sequestration. Graphical
The alternative text for this image may have been generated using AI.
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DOI
高影响因子
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