CRYSTAL RESEARCH AND TECHNOLOGY
·
2026
·Vol. 61
·期 9
·e70171
·
IF 2.1
Peiyuan Chen,Qingru Xu,Zeren Chen,Yanhui Pei
This study presents an effective approach for synthesizing high-purity, wet-stable vaterite via a refined CO 2 bubbling method, employing polydopamine (PDA) as both a crystal modifier and stabilizer. The effects of PDA on the properties of the resulting CaCO 3 and the wet-stability of vaterite were systematically investigated. The results revealed that the presence of PDA significantly increased the purity of the synthesized vaterite, with even a trace amount yielding 100% vaterite content. Furthermore, PDA led to a notable reduction in particle size and a substantial increase in the BET surface area of vaterite—by 30.6 to 41.3 times. The wet stability of vaterite under humid conditions (relative humidity = 75%) was remarkably improved, maintaining 100% purity without any phase transformation for up to 28 days. The enhanced purity and stability are attributed to two primary mechanisms: the chelation of Ca 2+ ions and the surface coating effect provided by PDA, through which the overall Gibbs free energy of CaCO 3 particles can be reduced.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Zhongyi Xin,Le Guo,Shiyu Sui,Fengjuan Wang,Liguo Wang,Zhiyong Liu,Jinyang Jiang
Waste concrete, a bulk solid waste currently underutilized in industry, contains calcium resources that can be valorized via CO₂ mineralization. This study develops a scalable method to synthesize high-purity vaterite by extracting Ca²⁺ from hardened cement paste powder (HCPP) using 0.8 M NH 4 Cl for 60 minutes, followed by sodium dodecyl benzene sulfonate (SDBS)-mediated aqueous carbonation at 25°C with a CO₂ flow rate of 0.5 L/min. The factors affecting the leaching of Ca 2 + , and the content and types of calcium carbonate (CaCO 3 ) generated were investigated. Quantitative phase analysis via XRD Rietveld refinement confirmed 98.9 % vaterite purity under optimized conditions. Moreover, scanning electron microscope (SEM) analysis revealed the growth process of vaterite at varying temperatures. Specifically, at low carbonation temperature (25, 40°C), the initial formation was of shell-like vaterite, which transitioned into nano-vaterite and eventually developed into a dense internal structure. Conversely, at high carbonation temperature (60°C), leaf-like vaterite grew first and subsequently evolved into a flower-like structure.
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高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Zongqi Feng,Tingyu Yang,Shichao Dong,Ting Wu,Wen Jin,Zhouying Wu,Bingping Wang,Tiantian Liang,Lei Cao,Lan Yu
Calcium carbonate (CaCO 3 ) has been widely studied as a drug delivery system (DDS), but it still has some limitations in its clinical application in tumor chemotherapy, such as difficult industrialization, complex synthesis methods, time-consuming and labor-intensive, and low drug loading. Here, we developed an industrialized method for the simple, rapid and controllable synthesis of high drug-loaded vaterite hollow CaCO 3 (VHC). The VHC was successfully prepared by adding L-Leucine (Leu) in the process of preparing CaCO 3 in an industrial method. The effects of different reaction conditions on VHC were studied in detail, and a possible formation mechanism of VHC was proposed. As an industrially synthesized DDS, the VHC had low cytotoxicity and good biocompatibility, and had higher loading capacity (39.68%) and encapsulation efficiency (90.17%) for doxorubicin hydrochloride (DOX) due to the existence of hollow nano-cavity. Meanwhile, DOX@VHC showed good pH responsiveness, which can achieve sustained release of DOX. And, DOX@VHC could significantly inhibit tumor cells (cell inhibitory rate: 91.73%) and reduce the toxicity to normal cells. The high drug-loaded VHC synthesized rapidly by industrial methods can achieve controllable drug delivery and high-efficiency inhibition of tumor cells, and has a good application prospect in tumor therapy.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Renlu Liu,Bin Lian
Ubiquitous bio-minerals exert significant effects on the migration and transformation of metal ions in the environment, however, research into the adsorption of heavy metals by biogenic vaterite (BV) has rarely been reported. The aim of our research was to evaluate the removal effects of Cd 2+ , Ni 2+ , and Cu 2+ in single and multi-metal ion aqueous solutions using BV induced by Bacillus subtilis . The results demonstrate that the adsorption data of BV for metal ions are more accurately fitted to the Langmuir model compared with the Freundlich model. The max adsorption capacity (mg/g) order of BV was Ni (270.27) > Cu (178.57) > Cd (172.41) in a single-metal system, and Cu (175.44) > Ni (94.34) > Cd (30.30) in a multi-metal system (pH = 5.0, 2.5 g/L). A competitive effect exists amongst heavy metals in multi-metal ion systems, and Cu 2+ adsorption is less affected by other two ions. Furthermore, BV can maintain favourable adsorption characteristics even in a very strong acidic environment (pH = 3.0), and its adsorptive capability becomes more favourable at higher temperatures. Kinetic analysis shows that the adsorption process can be better described by a pseudo-second-order model. XRD , FTIR, and SEM-EDS results reveal that metal ion adsorption on BV mostly happened through physical means, and the favourable adsorption characteristics of BV might be attributable to its larger specific surface area , aggregated spherical polyporous and organic–inorganic structure.
研究领域:
环境科学
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地球微生物学
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生物矿化
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环境污染与修复
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水处理技术
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CEMENT AND CONCRETE RESEARCH
·
2026
·
IF 14
Wanhao Yu,Yang Li,Le Guo,Fengjuan Wang,Jinyang Jiang,Zhiyong Liu
While vaterite is acknowledged to enhance the early-age strength of metakaolin-calcium carbonate-cement systems, understanding of its role in hydration remains limited. This study divides the hydration kinetics of ternary blends with vaterite substituting limestone powder into two stages, including an initial acceleration (up to 7 days) and a subsequent deceleration period. The filler effect of vaterite accelerates the reaction of clinker and metakaolin during the first 1–3 days. The earlier carboaluminate precipitation is attributed to the shortened time to reach maximum ettringite content, resulting from the accelerated depletion of gypsum. However, the enhanced pore refinement reduces the acceleration of vaterite on the rate of hydration growth after 7 days, compared to limestone powder. The R 3 test demonstrates that the vaterite reactivity is reduced by the coverage of hydration products on its surface. New insights are obtained on the correlation between reactivity and morphology evolution of vaterite in low-carbon blends.
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Journal of CO2 Utilization
·
2021
·
IF 7.132
Liang Ma,Long Zhao,Yun Li,Jianbin Zhang
The controllable synthesis of pure vaterite with the good properties and broad application prospects is considered as an important, yet a challenging task because the product properties are greatly affected by reaction conditions. In the present work, the controllable synthesis of pure vaterite crystals was explored with four different Ca 2+ sources including CaCl 2 , Ca(NO 3 ) 2 , CaBr 2 and Ca(Ac) 2 using an CO 2 -storage material (CO 2 SM) prepared by an indirect CO 2 utilization approach as the CO 3 2− source. The effects of five major reaction conditions including reaction medium, hydrothermal reaction temperature, hydrothermal reaction time, Ca 2+ concentration and sources, and pH and conductivity on the crystallization of CaCO 3 were systemically investigated. It is found that the amounts of CO 2 SM required for the formation of pure vaterite phase are in the order of CaBr 2 (20 g/L CO 2 SM) > Ca(NO 3 ) 2 (16 g/L CO 2 SM) > Ca(Ac) 2 (8 g/L CO 2 SM) due to the effects of ethylenediamine (EDA), diethylene glycol (DEG) and their anions. Especially, vaterite was not found in CaCl 2 system. The effects of Ca 2+ sources on the crystal phase composition of CaCO 3 are revealed for the controllable synthesis of CaCO 3 crystals. Our work not only provides a controllable synthesis method of pure vaterite, but also an indirect CO 2 utilization strategy.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Sikai Tang,Yuze Wang
Microbial-induced calcium carbonate precipitation (MICP), with its hydrophilic rough microstructures and as an environmentally friendly material modification method, has shown great potential for oil-water separation. However, its efficiency in separating oil-in-water emulsions remains challenging. This study advances the MICP method by producing microbially induced nanoscale calcium carbonate on a mesh using calcium acetate instead of traditional calcium chloride, successfully achieving efficient separation of oil-in-water emulsions. The stainless-steel mesh (SSM) after calcium acetate-MICP treatment obtained nano-elliptical flake-like vaterite (vaterite-SSM) and demonstrated superior superhydrophilicity and underwater superoleophobicity compared to the mesh coated with micro-cubic structured calcite (calcite-SSM) treated by calcium chloride-MICP. Notably, vaterite-SSM achieved a flux of up to 309 L·m −2 ·h −1 and an oil rejection rate of over 98.7 % in gravity-driven separation of oil-in-water emulsions, demonstrating significant reusability after 6 cycles. Conversely, calcite-SSM was ineffective in emulsion separation due to coating instability and large particle spacing. Additionally, vaterite-SSM effectively separated various oil-water mixtures, maintaining high performance across 30 separation cycles. This study underscores the important use of calcium acetate in MICP to obtain nano-elliptical flake-like vaterite for efficient oil-water emulsion separation, advancing the promise of MICP as an effective and sustainable method for environmental applications.
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FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Hao Zhang,Tuo Zhang,Jiachen Zang,Chenyan Lv,Guanghua Zhao
CO 2 is a greenhouse gas and a major contributor to global warming . Efficient conversion of CO 2 into high value-added food materials represents a promising strategy to decrease CO 2 concentration. In this study, we reported that Ca 2+ -crosslinked alginate beads loaded with carbonic anhydrase (CA) can efficiently catalyze conversion of CO 2 into porous vaterite CaCO 3 particles via a carboxymethyl cellulose (CMC) inducing process. CA encapsulated within the Ca 2+ -crosslinked alginate beads maintained around 100% activity of its original activity after 10 assay cycles. Functionally, the CA-loaded alginate beads facilitated conversion of CO 2 into porous vaterite CaCO 3 particles with high CO 2 removal efficiency in the presence of carboxymethyl cellulose. Notably, such vaterite CaCO 3 particles can be explored for adsorption of astaxanthin with higher loading capacity (2.0 wt %), consequently improving the photo- and thermal-stability of this pigment.
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JOURNAL OF MATERIALS RESEARCH
·
2020
·Vol. 35
·期 18
·2427-2440
·
IF 2.502
Tingyu Yang,Yu Wu,Xiaoqing Yue,Cuiyan Wang,Jianbin Zhang
The synthesis of antibacterial biomaterial with specific functions responsive to specific bacterial growth environments is of significant importance to achieve effective sterilization and reduce the resistant bacteria. Herein, inspired by biomineralization, we develop a one-pot, threonine (Thr)-mediated biomineralization method using a CO2 bubbling procedure to green, simply and quickly prepare vaterite CaCO3 microspheres as a platform for antibacterial Sanguinarine (SAN) delivery. The loading capacity of vaterite CaCO3 microspheres for SAN drugs reached 159.8 mg/g, corresponding to the loading efficiency of 83.7%. And for the first time, a novel Sanguinarine@calcium carbonate (SAN@CaCO3) organic–inorganic hybrid antibacterial biofilm was constructed by using vaterite CaCO3 microspheres with pH-responsive and high SAN drug-loading. Importantly, the film showed bacteria-triggered, pH-responsive SAN release properties and strong bactericidal ability (96.19%) for Staphylococcus aureus (S. aureus). Meanwhile, it also had antibacterial capabilities in real environments. In 7 days, it can significantly inhibit the adhesion and growth of bacteria in the air. The biomineralized synthetic vaterite CaCO3 microspheres and the application in the construction of pH-responsive antibacterial biofilm have bright future in resisting bacterial infections and reducing the production of resistant bacteria.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Li Yi,Bing Zou,Liping Xie,Rongqing Zhang
CaCO 3 , which occurs in three crystalline anhydrous polymorphs named calcite, aragonite, and vaterite, is always found in mineralized skeletons or growing shells of many marine organisms. However, understanding how these organisms achieve this control has been a significant challenge in biomineralization. In this work, we proposed a novel vaterite stabilizer acidic matrix protein PNU7 that existed in both prism and nacre of Pinctada fucata , and identified its functional domain DDDDDDHDDVEETED. Our experiments reveal that PNU7 triggers a stable large vaterite formation with Mg 2+ deficiency even under low Ca 2+ . Increasing PNU7 in the calcium carbonate crystallization system with Mg 2+ leads to a significant shrinking in crystal size and rising in nucleation quantity. Moreover, it converts an atomically rough dome-like shape to a smooth sphere on unsiliconized glass. These effects rescind after removing the asp-rich region at the C-terminus. We also find that decreasing pnu7 mRNA in vivo leads to nacreous inner surface growth substantially lessened. Thus, PNU7 may not only supply vaterite in shell formation but also involve the nacreous regulation via surface energy minimization.
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PubMed
高影响因子
CRYSTAL RESEARCH AND TECHNOLOGY
·
2015
·Vol. 50
·期 4
·312-318
·
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
·
结晶学
·
纳米材料
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生物矿化
·
绿色化学
·
功能材料
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2026
·
IF 9.2
Lei Liu,Yan Wang,Yanling Deng,Huiying Zhang,Wen Hong,Malcom Frimpong Dapaah,Abdallah Abdelfattah,Hui Jia
A novel HAP@Vaterite was optimized via both single-factor experiments and RSM model. • The quadratic model shows high accuracy, with only 0.19% deviation in F − removal rate. • Vat-5.9 achieved a peak F − adsorption capacity of 23.3 mg/g, with over 99% removal. • F − competes coordination sites with PO 4 3− , induces ACP transformation into Ca 5 (PO 4 ) 3 F. • HAP@Vaterite offers high socio-economic benefit and a net reduction of CO 2 emissions. The presence of fluoride (F − ) in wastewater poses escalating threats to both the ecological systems and human health. This study developed an HAP@Vaterite composite through green biomineralization and phosphate modification for the efficient removal of F − from low-concentration wastewater, while maintaining promising engineering applications. The optimal formulation, Vat-5.9, was determined by single-factor experiments and the Box-Behnken response surface methodology. The predicted and experimental removal efficiencies differed by only 0.19%, confirming the model's reliability. Compared to chemically synthesized CaCO 3 mineralization material (Cal-5.9), Vat-5.9 exhibited a maximum F − adsorption capacity of 23.3 mg/g, achieving a removal efficiency exceeding 99%. The adsorption process is spontaneous and endothermic (ΔG < 0, ΔH > 0). Defluoridation proceeds via two synergistic pathways: (1) substitution of –OH by F − , leading to stable Ca–F bonds, and observed deposition of CaF 2 microcrystals on the material's surface, and (2) competition of F − with PO 4 3− for coordination sites, which drives the crystallization of amorphous calcium phosphate into Ca 5 (PO 4 ) 3 F. Notably, 0.1 mol/L NaOH solution was identified as optimal for sorbent regeneration. Importantly, Vat-5.9 exhibited superior performance in treating domestic sewage, reaching saturation breakthrough significantly later than in industrial wastewater, thereby underscoring its safety for domestic water supplies. Both techno-economic analysis and life cycle assessment indicated that HAP@Vaterite offers significant economic and health benefits, with a socio-economic value of 74,000 $/ adsorbent , alongside a net reduction in CO 2 emissions (1.80 tCO 2 -eq/t adsorbent ). This work establishes a practical framework for assessing the feasibility of green and cost-effective F − remediation, aligning with China's sustainable development objectives. Download: Download high-res image (447KB) Download: Download full-size image
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