对碳酸盐矿物合成实验方法的改进研究——以气体扩散法为例
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摘要
在利用气体扩散法制取碳酸钙的过程中,样品的叠加摆放会导致不同层位的沉淀过程不同步进而增大实验误差。文章研究了样品在干燥器中摆放高度对实验结果的影响,并改进了收集沉淀物的方法。结果显示,随着摆放高度的增加,溶液pH值、电导率和沉淀物重量均呈规律性下降。培养皿之间的相互遮挡也会在一定程度上影响碳酸钙的矿化进程。少量沉淀物残留于培养皿上和/或溶液中是造成沉淀物收集不完全(或重量数据不准确)的主要原因。文章的实验结果对于利用气体扩散法研究碳酸钙仿生合成具有一定的借鉴意义。
In preparing calcium carbonate solution samples by gas diffusion method, the stacking of samples will lead to asynchronous precipitation of dissolved constituents at different layers that in turn cause the increase of experimental error. In this paper, the effect of sample placement height on experimental results was studied, and the method of collecting sediment was optimized. The results showed that the pH, the electrical conductivity and the precipitate weight decreased with the increase of the placement height of the solution. When the Petri dishes are placed in super position, it will affect the mineralization process of the calcium carbonate to a certain extent. In the sediment collection process, the small amount of sediments residue on Petri dishes and/or solution is the main cause of incompletion of sediment collection(or inaccuracy of weight data). The experimental results of this paper have some reference for bionic synthesis of calcium carbonate using gas diffusion method.
In preparing calcium carbonate solution samples by gas diffusion method, the stacking of samples will lead to asynchronous precipitation of dissolved constituents at different layers that in turn cause the increase of experimental error. In this paper, the effect of sample placement height on experimental results was studied, and the method of collecting sediment was optimized. The results showed that the pH, the electrical conductivity and the precipitate weight decreased with the increase of the placement height of the solution. When the Petri dishes are placed in super position, it will affect the mineralization process of the calcium carbonate to a certain extent. In the sediment collection process, the small amount of sediments residue on Petri dishes and/or solution is the main cause of incompletion of sediment collection(or inaccuracy of weight data). The experimental results of this paper have some reference for bionic synthesis of calcium carbonate using gas diffusion method.
引文
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[2] Politi Y,Metzler R A,Abrecht M,et al.Transformation mechanism of amorphous calcium carbonate into calcite in the sea urchin larval spicule [J].Proceedings of the National Academy of Sciences,2008,105(45):17362-17366.
[3] Bosio V E,Cacicedo M L,Calviganac B,et al.Synthesis and characterization of CaCO3-biopolymer hybrid nonoporous microparticels for controlled release of doxorubicin [J].Colloids and Surfaces B:Biointerfaces,2014,158-169.
[4] 冯庆玲,侯文涛.碳酸钙生物矿化的体外研究进展 [J].清华大学学报(自然科学版),2006,46 (12):2019-2023.
[5] 任丽英,张群,李倩倩.超细碳酸钙粉体的制备 [J].应用化工,2014,43 (5):850-852.
[6] 翟相林,王成毓,徐杨,等.仿生合成的功能性纳米碳酸钙在造纸中的应用 [J].东北林业大学学报,2009,37 (8):48-49,52.
[7] Sedlak M,Antonietti M,ColfenH.Synthesis of a new class of double-hydrophilic block copolymers with calcium binding capacity as builders and for biomimetic structure control of minerals[J].Macromolecular Chemistry Physics,1998,199 (2):247-254.
[8] Liu X,Zhang L,Wang Y,et al.Biomimetic crystallization of unusual Macro porous Calcium Carbonate Spherules in the Presence of Phosphatdylglycerol Vesicles [J].Crystal Growth & Design,2008,8:759-762.
[9] Qiao L,Feng Q,Lu S.In vitro growth of nacre-like tablet forming:from amorphous calcium carbonate,nanostacks to hexagonal tablets [J].Crystal Growth & Design,2008,8(5),1509-1514.
[10] Zhang C,Zhang J,Feng X,et al.Influence of surfactants on the morphologies of CaCO3 by carbonation route with compressed CO2 [J].Colloids and Surfaces A:Physicochemical and Engineering Aspects,2008,324(1-3):167-170.
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