The preparation of calcium carbonate crystals regulated by mixed cationic/cationic surfactants

Zhao, Yingyuan; Li, Shuxia; Yu, Li; Liu, Yonghui; Wang, Xiaoqing; Jiao, Jingjing

doi:10.1016/j.jcrysgro.2011.03.052

Cited by 25 publications

(10 citation statements)

References 51 publications

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“…The effects of cationic surfactants 1-dodecyl-3methylimidazolium bromide ([C 12 mim]Br) and didodecyldimethylammonium bromide (DDAB), either individually or mixed together, were also investigated. 8,44 With [C 12 mim]Br, laminated cube shaped structures and string-like structures, all consisting of calcite, appeared at 15-30 and 60 mmol L À1 respectively. With DDAB, the crystalline form converted from laminated cube shaped calcite to spherical vaterite as the surfactant concentration increased from 2.5 to 10 mmol L À1 .…”

Section: Tablementioning

confidence: 99%

Synthesis of micro and nano-sized calcium carbonate particles and their applications

2014

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Section: Tablementioning

confidence: 99%

Synthesis of micro and nano-sized calcium carbonate particles and their applications

2014

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“…Grains that were subject to the alkaline H 2 O 2 pretreatment are structurally indistinguishable from untreated grains, both at the scale of an entire grain and on a submicron scale (Figures 4a-4f and 5a-5f). The latter are characteristic of vaterite (Boyjoo et al, 2014), a metastable polymorph of calcium carbonate (CaCO 3 ) that may form subject to certain conditions including pH, water chemistry, presence of organic compounds, and the substrate (Pochitalkina et al, 2016;Ren et al, 2011;Zhao et al, 2011). M2 calcite grains developed a surficial morphology characterized by elongate rhombohedral crystals, and adhered to the grain surfaces were discrete rhombohedral calcite crystals, dumbbell-shaped crystals, and cauliflower-like polycrystalline aggregates (Figures 4h and 4i).…”

Section: Geochemistry Geophysics Geosystemsmentioning

confidence: 99%

Hydrogen Peroxide Treatment of Natural Lake Sediment Prior to Carbon and Oxygen Stable Isotope Analysis of Calcium Carbonate

Falster

Delean

Tyler

2018

Geochem Geophys Geosyst

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The carbon and oxygen stable isotope ratios (δ13C and δ18O) of authigenic and biogenic lacustrine carbonates are commonly used as past climate proxies, and these carbonates are often preserved within organic‐rich bulk sediment. We measured the δ13C and δ18O of carbon dioxide evolved from fine‐grained crystalline calcite and biogenic aragonite, mixed with natural organic‐rich lake sediment. We found that if the ratio of total inorganic carbon (TIC) to total organic carbon (TOC) in lacustrine bulk sediment is low, then organic compounds evolve detectable CO2 during phosphoric acid digestion, leading to an “organic bias” in the measured δ13C and δ18O. We tested the effect of oxidative pretreatment of the bulk sediment with acidic or alkaline hydrogen peroxide (H2O2), at a range of temperatures. Pretreatment with acidic H2O2 not only had a negligible effect on the TIC/TOC but also resulted in dissolution and reprecipitation of carbonate, and a consequent “treatment bias” that was particularly strong for δ18O. Oxidation with alkaline H2O2 removed a greater proportion of organic material, with no evidence for carbonate dissolution at temperatures of ≤50 °C. The δ13C and δ18O values obtained from sediment treated with alkaline H2O2 at 50 °C were both accurate and precise, even for sediment with very low initial TIC/TOC. Our results show that it is possible to obtain accurate δ13C and δ18O values from carbonates preserved within organic‐rich lacustrine sediment, suitable for use in paleoclimate reconstructions.

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“…Thus, excess CO 2 SM and low temperature could not only lead to greater supersaturation but also to free CO 2 being converted into CO 3 2– in the reaction system. Then, Ca 2+ would be surrounded by abundant CO 3 2– to form small micelles because there would be not enough Ca 2+ . , Then, CO 3 2– on the outside surface of small micelles could continue to attract Ca 2+ via electrostatic interactions to form bigger micelles . This process was repeated until all Ca 2+ ions were consumed in the presence of EDA and BDO (samples G–J).…”

Section: Resultsmentioning

confidence: 99%

Controllable Synthesis of Various CaCO₃ Morphologies Based on a CCUS Idea

Sha

Zhu

Bai

et al. 2016

ACS Sustainable Chem. Eng.

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A novel, green, and economic CaCO 3 synthesis method using a CO 2 -storage material (CO 2 SM) was developed based on the strategy of carbon capture, utilization, and storage (CCUS). In this process, CO 2 SM was used as both a CO 2 source and a crystal modifier to regulate and control the crystallization of CaCO 3 . 1,4-Butanediol (BDO) and/or 1,2-ethanediamine (EDA) from CO 2 SM played unexpected roles as a surfactant, structure-directing agent, and/or pH modulator. The effects of CO 2 SM concentrations, reaction temperatures, and reaction times were systematically investigated. Pure calcite (bundle-like and dumbbell-like) and pure vaterite (oblate spheroid and snowball-like) CaCO 3 products were obtained. Moreover, the CO 2 SM was recycled to prepare same crystal phase CaCO 3 upon the addition of an appropriate amount of Ca(OH) 2 with 120 g•L −1 CO 2 SM concentration.

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The preparation of calcium carbonate crystals regulated by mixed cationic/cationic surfactants

Cited by 25 publications

References 51 publications

Synthesis of micro and nano-sized calcium carbonate particles and their applications

Synthesis of micro and nano-sized calcium carbonate particles and their applications

Hydrogen Peroxide Treatment of Natural Lake Sediment Prior to Carbon and Oxygen Stable Isotope Analysis of Calcium Carbonate

Controllable Synthesis of Various CaCO₃ Morphologies Based on a CCUS Idea

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The preparation of calcium carbonate crystals regulated by mixed cationic/cationic surfactants

Cited by 25 publications

References 51 publications

Synthesis of micro and nano-sized calcium carbonate particles and their applications

Synthesis of micro and nano-sized calcium carbonate particles and their applications

Hydrogen Peroxide Treatment of Natural Lake Sediment Prior to Carbon and Oxygen Stable Isotope Analysis of Calcium Carbonate

Controllable Synthesis of Various CaCO3 Morphologies Based on a CCUS Idea

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Controllable Synthesis of Various CaCO₃ Morphologies Based on a CCUS Idea