Journal of CO2 Utilization
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2019
·
IF 5.189
Wei Zhang,Fengzhen Zhang,Liping Ma,Jing Yang,Yi Wei,Deqi Kong
In this work, we propose a novel, effective, energy efficient technology to reduce CO 2 emissions and fully use the calcium in the solid waste by-product phosphogypsum (PG), by capturing CO 2 from the PG decomposition product’s hydrolysis solution. Experiments were conducted to investigate the technical feasibility and the influence of temperature and CO 2 partial pressure on CO 2 capture, as well as CO 2 loading on CO 2 sorption capacity. The results showed that > 90 % of the total calcium ions in the solution were converted into calcium carbonate (CaCO 3 ). Furthermore, a decrease in temperature and an increase in CO 2 partial pressure improved CO 2 uptake, with the latter having a greater effect on CO 2 capture capacity than the former. Moreover, kinetic analysis demonstrated that a higher temperature and CO 2 partial pressure increased the absorption rate; and showed that the CO 2 absorption rate is highly affected by the CO 2 loading levels. The thermodynamic analysis indicated that CO 2 absorption heat significantly declined as a function of increasing CO 2 loading. CaO from the calcination of carbonate was added to the hydrolysis solution and significantly enhanced its CO 2 capture ability. Thus, the hydrolyate of PG decomposition products in combination with CaO reinforcement may be a promising method for CO 2 capture.
研究领域:
环境化学
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工业生态学
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固废资源化
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碳捕集与封存
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过程强化
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高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2015
·Vol. 50
·期 4
·312-318
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IF 0.935
Yadong Hu,Yinghua Zhou,Xurong Xu,Ruikang Tang
The evolution of amorphous calcium carbonate (ACC) into crystals in ethanol/water binary solvents under ambient temperature was investigated, and it was found to depend on the volume ratio of ethanol to water (R). Calcite remained dominant when the amount of water was high (R = 1/3). A slight change in the amount of ethanol (R = 3/1) could lead to a dramatic change in the polymorph from calcite to aragonite. However, when poly (allylamine hydrochloride) (PAH) was added at R = 3/1, almost pure vaterite could be obtained, which has a specific morphological variation (from hollow microspheres to cloud-like). This study provides an alternative polymorphic route for the CaCO 3 mineral by using the evolution of ACC in different solvent environments, which provides some useful clues for understanding the importance of kinetic control of the morphologies and polymorphs of a wide range of inorganic materials. In addition, this simple mild phase-controlled synthetic method could be scaled up as a green chemistry route for the industrial production of different polymorphs of CaCO 3 .
研究领域:
材料化学
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结晶学
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纳米材料
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生物矿化
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绿色化学
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功能材料
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高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 40
·16028-16034
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IF 5.101
Jun Shi,Zhengzheng Zhang,Gefei Li,Shaokui Cao
Alginate/CaCO3 hybrid beads with pH- and thermal-responsive drug release properties were prepared under compressed CO2 using aliphatic poly(urethane-amine)s (PU) as the thermal-responsive component. Polyacrylic acid (PAA) was used as a crystal growth additive to control the structure of the hybrid beads. The hybrid beads were characterized by using scanning electron microscopy, X-ray powder diffraction and thermogravimetric analysis. The interaction between PAA and aliphatic PU contributed to the formation of alginate beads with a compact CaCO3 shell. Indomethacin release behaviour was found to be pH- and thermal-responsive. The release profiles were sustained with CaCO3 microparticles, indicating that the compact CaCO3 shell could hinder the permeability of the encapsulated drug and reduce the drug release effectively. The results suggest that the hybrid alginate beads can be used as “smart” polysaccharide materials for sustained dual-responsive drug delivery.
研究领域:
生物材料
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药物递送系统
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高分子科学
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纳米医学
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药剂学
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生物化学
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组织工程
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DOI
高影响因子
DESALINATION
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2012
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IF 2.59
Lei Ling,Yuming Zhou,Jingyi Huang,Qingzhao Yao,Guangqing Liu,Peixin Zhang,Wei Sun,Wendao Wu
In an attempt to control Ca 3 (PO 4 ) 2 , CaCO 3 , and CaSO 4 deposits in industrial recycling water systems, an acrylic acid (AA)-allyloxy poly(ethylene glycol) polyglycerol carboxylate (APEG-PG-COOH) copolymer was synthesized as a nonphosphorus inhibitor. The synthesized polymer was characterized by 1 H NMR. The performance of PAA/APEG-PG-COOH on inhibition of Ca 3 (PO 4 ) 2 , CaCO 3 and CaSO 4 precipitation was studied through static scale inhibition tests. It was shown that PAA/APEG-PG-COOH exhibited excellent ability to control inorganic minerals, with approximately 100% CaSO 4 inhibition and 99.89% Ca 3 (PO 4 ) 2 inhibition at levels of 3 and 6 mg/L PAA/APEG-PG-COOH, respectively. PAA/APEG-PG-COOH also displayed ability to prevent the formation of CaCO 3 scales. The effects on formation of Ca 3 (PO 4 ) 2 , CaCO 3 and CaSO 4 were investigated with combination of Scanning electronic microscopy (SEM), Transmission electron microscopy (TEM), and X-ray powder diffraction (XRD) analysis, respectively.
研究领域:
环境化学
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材料科学
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工业水处理
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高分子化学
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腐蚀与防护
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矿物结垢控制
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
·
IF 3.8
Yichen Yu,Hailu Wang,Hongxing Zhan,Yuanbing Li,Shujing Li
Monoclinic barium aluminosilicate (celsian) shows application potential owing to its high-temperature resistance, low thermal conductivity, and excellent oxidative reduction properties. Hexacelsian can easily undergo nucleation because of its favorably symmetric crystal structure, resulting in faster precipitation compared to in the case of celsian. This study successfully synthesized celsian Ba 1− x Ca x Al 2 Si 2 O 8 using a two-step sintering method. Ca 2+ doping significantly promoted celsian formation, with each 5% increase in CaO content reducing synthesis temperature by ∼50°C. A nearly pure monoclinic celsian phase (Ba 0.7 Ca 0.3 Al 2 Si 2 O 8 ) was obtained after 3 h of heat treatment at 1300°C, achieving a ∼100°C reduction compared to conventional one-step sintering. Meanwhile, the celsian Ba 1− x Ca x Al 2 Si 2 O 8 prepared by the two-step sintering method exhibits higher bulk density and thermal conductivity compared to the one-step sintering method. And the thermal conductivity decreased progressively with both increasing heat treatment temperature and CaO content, primarily influenced by phase composition and crystalline defects.
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高影响因子
JOM
·
2025
·
IF 2.3
Zhu Yongpeng,Zhao Yuming,Liu Jinhui,Xu Xin,Sheng Kaifan,Chen Chuanyang,Li Xiaofeng,Tang Weineng,Gao Shenghui,Zhang Zexue,Gao Chunyun,Liu Qiang,Zhang Shaojun
This study investigates the chemical composition, particle size distribution, magnetic components, and alkaline sources of magnesium slag to enhance its utilization as a solid waste. Comprehensive characterization was achieved through multiple techniques, including graded sieving (16–150 mesh), magnetic separation, XRD, SEM/EDS, and EDTA titration, which systematically revealed the physicochemical properties of the slag. The sieving results indicate that β-Ca 2 SiO 4 is the dominant phase in the fraction larger than 1180 μm (11.55%), while γ-Ca 2 SiO 4 predominates in the fraction smaller than 180 μm (56.53%). The white particles in the magnesium slag originate from partially reacted dolime, whereas the black particles arise from incompletely reduced zones within the pellets. Magnetic separation analysis shows that coarse particles (> 1 mm) in the magnetic fraction mainly come from high-temperature oxidized spalls from the reduction reactor, while fine powders (< 200 μm) consist primarily of ferrosilicon (Fe x Si y ). Titration results demonstrate that the free calcium oxide (f-CaO) content accounts for 6.75 ± 0.1% by mass and serves as the primary contributor to the slag’s alkalinity. Through qualitative and quantitative analysis, this study elucidates the relationship between the physicochemical properties of magnesium slag and its resource utilization, providing key scientific evidence and practical guidance for high-value applications.
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高影响因子
Environmental Science-Processes & Impacts
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2025
·
IF 3.9
Zhe Shen,Kailou Liu,Jiwen Li,Nano Alemu Daba,Md Ashraful Alam,Kiya Adare Tadesse,Tianfu Han,Huimin Zhang
Lime and crop straw are widely applied to mitigate soil acidification and improve soil fertility. However, how different lime materials interact with straw to influence greenhouse gas (GHG) emissions from acidic upland soils remains poorly understood. This study explored how different lime materials and their interaction with straw affect GHG emissions. Here, we conducted incubation experiments with acidic red soil to investigate the individual and combined effects of liming materials, including Ca(OH)2, CaO, and CaCO3, as well as rice straw addition on nitrous oxide (N2O) and carbon dioxide (CO2) emissions. Our findings demonstrated that in the absence of straw, liming increased N2O emission by 20.3% (CaO) to 78.2% (Ca(OH)2). CaCO3 application raised CO2 emissions by 182.7%, while CaO and Ca(OH)2 decreased CO2 emissions by 37.3% and 43.2%, respectively. Adding straw alone enhanced N2O and CO2 emissions by 80.69% and 302.7%, respectively. When combined with straw, liming further increased N2O emissions by 85.0% to 140.1%, with Ca(OH)2 causing the highest emissions. CaCO3 increased CO2 emissions by 37.3% when combined with straw, whereas CaO and Ca(OH)2 reduced CO2 emissions by 31.6% and 32.2%, respectively. Straw addition significantly increased global warming potential (GWP). Applying CaO and Ca(OH)2 decreased GWP, whereas CaCO3 increased it with straw application. Compared to CaCO3, CaO and Ca(OH)2 application resulted in a lower GWP, making them optimal lime materials for reducing acidification and mitigating GHG emissions. Linear regression and partial least squares path (PLS-PM) analyses indicated that soil carbon, nitrogen, and microbial biomass significantly influenced N2O emissions under lime and straw application, while CO2 emissions were unaffected by these soil properties. Both lime and straw addition increased microbial biomass carbon (MBC) and nitrogen (MBN), dissolved organic carbon (DOC), and NH4+–N contents, but decreased NO3−–N content, leading to higher N2O emissions. CO2 emissions were influenced by the chemical reactions of various lime materials in the soil. These findings suggest that selecting appropriate lime materials can significantly mitigate greenhouse gas emissions from acidic soils, contributing to more sustainable agricultural practices.
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Fei Liu,Zhixiang Wei,Yujie Zhao,Shaojun Liu,Hao Li
The rapid densification of ceramics printed by digital light processing (DLP) has been a technical and scientific challenge in the field of additive manufacturing. This work explores the rapid microwave hybrid sintering (MS) process for DLP-printed 0.95MgTiO 3 -0.05CaTiO 3 (MT-CT) microwave ceramics, aiming at reducing the densification time. The sintering trajectories of DLP-printed MT-CT ceramics at 1300°С show that highly dense ceramics without significant grain growth can be achieved by only 75 min and a fast heating rate (30°С/min). The MS process can enable DLP-printed MT-CT ceramics to reach the initial, intermediate, and final stages of sintering at a temperature 100 °C lower than that required for the CS process by integrating uniform volumetric heating with thermal radiation. DLP-printed MT-CT ceramics sintered by MS exhibit excellent dielectric properties: ε r = 20.4, Q × f = 75,300 GHz, τ f = −2.5 ppm/°C, representing a 13.4 % enhancement in Q × f values compared to ceramics by CS for 240 min. DLP-printed MT-CT dielectric resonator antenna sintered by MS at 1300°С for 75 min exhibits a radiation efficiency exceeding 90 % at 5.9 GHz ( S 11 = −42.43 dB), showing their promising potential for high-frequency communication applications.
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高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Wenzhi Su,Kaiming Kan,Chuancheng Zhang,Yong Zou,Shoujun Din,Qingli Zhang
The influence of alkali and alkaline earth metal ion doping on the upconversion (UC) luminescence properties of Yb3+, Ho3+ co-doped NaBi(MoO4)2 (NBM) single crystals was systematically investigated. A series of Yb3+, Ho3+:NBM single crystals doped with Li+, K+, and Ca2+ ions were successfully grown using the Czochralski method. Their structural characteristics were analyzed through X-ray diffraction (XRD), transmission spectroscopy, and scanning electron microscopy (SEM), confirming a tetragonal crystal structure with space group I41/a. Under 980 nm and 450 nm laser excitation, the crystals exhibited distinct UC emission profiles, with dominant red and green emissions, respectively. Tauc plot analysis indicated that Ca2+ doping introduced donor levels within the crystal lattice, effectively narrowing the optical bandgap. Power-dependent luminescence studies revealed that both red and green UC emissions originated from two-photon excitation processes. Temperature-dependent photoluminescence measurements under both excitation wavelengths demonstrated that codoping with Li+, K+, and Ca2+ significantly enhanced the thermal stability of the luminescent properties. Furthermore, variable-temperature fluorescence lifetime analyses showed that alkali and alkaline earth metal ion doping effectively mitigated the luminescence lifetimes. Overall, the incorporation of Li+, K+, and Ca2+ ions was found to markedly improve both the UC luminescence intensity and thermal robustness of Yb3+, Ho3+:NBM single crystals, offering promising prospects for high-performance luminescent materials.
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高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Huirong Zhang,Lijun Zhu,Xiaojun Xue,Qiang Ren,Jinglei Cui,Baofeng Wang,Dongke Zhang,Fangqin Cheng
This study provides mechanistic insights into the inherent calcite-mediated trade-offs in toluene adsorption and regeneration performance of coal-based activated carbon (AC). ACs, from coal with varying calcite (1, 2, and 3%), were prepared via steam activation. While 1% calcite modestly slightly enhanced toluene adsorption to 81.60 mg g −1 by optimizing microporosity and surface π-π interactions, however, higher calcite content (≥2%) exhibited severe performance degradation. Specifically, 3% calcite caused a drastic decline in adsorption capacity to 17.54 mg g −1 , a 77.35% reduction compared to calcite-free AC. This destruction stems from over-etching during activation, leading to micropore collapse (79.5% reduction in microporous surface area), loss of total specific surface area (57.4% decrease), and disrupted graphitization, weakening π-π conjugation with toluene. Surface oxygen group imbalances shifted the mechanism from intraparticle diffusion to superficial, weak physical adsorption. Notably, 1% calcite AC demonstrated superior initial regeneration, retaining 95% of its initial capacity after 10 cycles, attributed to calcite-induced reduction of surface oxygen groups, increasing hydrophobicity and strengthening π–π interactions. However, this enhancement is tempered by a trade-off, as extended use results in microstructural degradation, with micropore volume gradually decreasing, limiting long-term performance. This study revealed calcite's dual nature, emphasizing that optimizing its content is essential for balancing short-term performance with long-term structural integrity for stable VOC removal.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuyang Zhang,Ruirui Ma,Kunpeng Jia,Shunhang Dong,Jie Chen,Changjiang Pan
Titanium and its alloys, as the most prevalent materials for orthopedic implants, face two critical challenges in clinical practice: inadequate osseointegration and susceptibility to bacterial infection. To resolve these issues, a multifunctional coating (TNT+XGPP) was developed on Ti implants via three steps: electrochemical anodization to construct TiO 2 nanotube (TNT), hydrothermal loading of bone-affinity Ga 3+ ions (TNT+XG) at different concentrations, and carbodiimide-mediated grafting of γ-polyglutamic acid (γ-PGA) via a polydopamine intermediate layer. The morphology, composition, surface wettability, and ion release behavior of the prepared coatings were thoroughly characterized. The coatings were assessed for early-stage osteoblast growth behavior, Ca-P apatite formation capacity, and antibacterial activity. The characterization results confirmed that Ga 3+ ions and γ-PGA were successfully incorporated into TiO 2 nanotubes, significantly enhancing hydrophilicity. The TNT+XGPP coating, in conjunction with the nanotubes, Ga 3+ ions at appropriate concentrations (5, 20, and 50 mM), and γ-PGA, not only facilitated osteoblast adhesion and proliferation, but also upregulated the expression of osteogenic functional factors (e.g., alkaline phosphatase, osteocalcin, and runt-related transcription factor-2). In contrast, an elevated concentration of Ga 3+ ions (100 mM) in the coating exerted a certain inhibitory effect against osteoblast growth. The TNT+XGPP coating accelerated the in-situ deposition of bone-like Ca-P apatite, attributing to the synergy of γ-PGA and Ga 3+ ions. The released Ga 3+ ions exerted remarkable antibacterial effects against E. coli and S. aureus , with their concentration positively associated with antibacterial activity. This work offers a novel strategy for enhancing the bone affinity and antibacterial properties of Ti-based orthopedic implants.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 29
·61520-61530
·
IF 5.6
Yunlong Li,Dan Zhang,Taifang Zhang,Lingxuan Zhou,Peng Wang,Vesna Đorđević,Valery F. Gremenok,Miroslav D. Dramićanin,Chonggeng Ma
Environment-friendly Fe 3+ ions as near-infrared (NIR) activators have garnered significant attention in intelligent NIR light sources; however, designing wavelength-tunable and outstanding thermal stability Fe 3+ -doped NIR luminescent materials remains a formidable challenge. In this study, we synthesized a novel garnet-structured NIR phosphor Y 2 CaAl 4 SiO 12 : Fe 3+ , Yb 3+ and investigated its luminescent properties and energy transfer mechanisms. Under 270 nm ultraviolet light excitation, Y 2 CaAl 4 SiO 12 : Fe 3+ demonstrates broadband NIR emission peaking at 803 nm, characterized by a full width at half maximum (FWHM) of 107 nm and exhibiting a remarkably high internal quantum efficiency (IQE) of 91.70 %, which is markedly superior to most reported Fe 3+ doping NIR-emitting materials. Notably, the incorporation of Yb 3+ ions facilitates an efficient energy transfer process from Fe 3+ to Yb 3+ , which not only significantly broadens the emission spectrum but also enhances the thermal stability of Fe 3+ (I 373 K /I 298 K = 59.24 %) compared to the singly Fe 3+ doped sample (I 373 K /I 298 K = 45.30 %). Finally, the optimized Y 2 CaAl 4 SiO 12 : Fe 3+ , Yb 3+ NIR phosphor exhibits promising potential for anti-counterfeiting applications.
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高影响因子
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