纯水和棕榈酸体系中Mg2+/Sr2+对碳酸钙结晶行为的影响  

Effect of Mg2+/Sr2+ on crystallization behavior of calcium carbonate in pure water and palmitic acid system

作　　者：唐何娜 杨磊 刘艳茹 陈进 TANG He-na;YANG Lei;LIU Yan-ru;CHEN Jin(School of Oceanography and Meteorology,Guangdong Ocean University,Zhanjiang Guangdong 524088;School of Chemistry and Environment,Guangdong Ocean University,Zhanjiang Guangdong 524088;Zhanjiang Jiahui Pearl Co.,Ltd,Zhanjiang Guangdong 524001,China)

机构地区：[1]广东海洋大学海洋与气象学院,广东湛江524088 [2]广东海洋大学化学与环境学院,广东湛江524088 [3]湛江市嘉辉珍珠有限公司,广东湛江524001

出　　处：《电子显微学报》2019年第6期639-649,共11页Journal of Chinese Electron Microscopy Society

基　　金：广东省海洋渔业科技推广专项资助项目(No.Z2015003);湛江市科技计划项目(No.2014A02011);广东省科技发展专项资助项目(No.2016A020222013);中央财政2017年暨2016年度渔业成品油价格改革财政补助资金湛江市级统筹部分项目(湛财工[2018]106号,zj[2018]008)

摘　　要：利用X-射线粉末衍射、扫描电镜、傅里叶变换红外光谱等探究不同溶液体系中Mg2+和Sr2+作为无机添加剂体外合成碳酸钙的结晶行为。研究结果表明:水溶液体系中(1)Mg^2+能够诱导文石生成,文石呈不规则片状结构且发现有形似“杨桃”的椭球状晶体形成;(2)Sr^2+能够抑制方解石生成从而诱导颗粒状球文石和枝状文石的生成,两种溶液体系得到的矿化物质组成成分与珍珠相似,但各组分所占比例与珍珠存在差异,水接触角测试表明添加无机离子能够改变碳酸钙的表面性质,亲水性减弱;(3)棕榈酸体系中棕榈酸和棕榈酸/镁体系中均有文石和方解石型碳酸钙生成,棕榈酸调控下诱导枝状文石形成;(4)添加Mg^2+得到了由纳米颗粒聚集而成的“枣核”状文石棕榈酸/锶体系,三种晶相均有发现但以球文石相为主呈纳米颗粒状,棕榈酸体系制备的样品疏水,向体系添加Sr2+碳酸钙样品仍表现为疏水,添加Mg^2+样品则表现为亲水。X-ray powder diffraction,scanning electron microscopy and Fourier transform infrared spectroscopy were used to investigate the crystallization behavior of calcium carbonate synthesized in vitro by Mg^2+ and Sr2+as inorganic additives in different solution systems.The results show that(1)Mg^2+ can induce aragonite formation in aqueous solution system,aragonite has irregularlamellar structure,and ellipsoidal crystal formation similar to“carambola”is found;(2)Sr^2+ can inhibit calcite formation,thus inducing granular aragonite and dendritic aragonite formation.The composition of mineralized substances obtained in the two solutions systems is similar to that of pearls,but the proportion of each component is different from that of pearls.Water contact angle test shows that adding inorganic ions can change the surface properties of calcium carbonate,and the hydrophilicity is weakened.In palmitic acid system;(3)aragonite and calcite calcium carbonate were formed in palmitic acid and palmitic acid/magnesium system,dendriticaragonite was induced under the control of palmitic acid,and“jujube stone”aragonite formed by aggregation of nanoparticles was obtained by adding Mg^2+;(4)palmitic acid/strontium system was found in all three crystalline phases,but mainly spherulite phasewas nano-granular,the samples prepared in palmitic acid system were hydrophobic,the samples added with Sr^2+ calcium carbonate still showed hydrophobic,while the samples added with Mg^2+ showed hydrophilic.

关 键 词：碳酸钙 MG^2+ Sr^2+ 棕榈酸 

分 类 号：P571[天文地球—矿物学] P575[天文地球—地质学]