锶离子对仿生碳酸钙矿化过程的影响及其矿化吸附性能

Effect of Strontium Ions on the Biomimetic Mineralization of Calcium Carbonate and Adsorption Properties of Mineralization

以鸡蛋清蛋白为诱导剂,研究了Sr^(2+)对CaCO_3仿生矿化过程的影响,并结合扫描电子显微镜、X射线衍射和傅立叶红外光谱的表征结果,对其调控机理进行了探讨,在此基础上进一步研究了CaCO_3的仿生矿化过程对Sr^(2+)的吸附富集作用。结果表明:Sr^(2+)单独加入不会影响Ca CO3的矿化过程,只有与蛋清蛋白共同作用时,才有利于针状文石型CaCO_3的生成;矿化过程对Sr^(2+)的吸附率随着Sr^(2+)浓度的增大而增大,在Sr^(2+)质量浓度为100 mg/L时达到最大,而后基本保持不变;虽然直接沉淀法对Sr^(2+)的吸附率明显大于气体扩散法,但气体扩散法运用仿生技术吸附Sr^(2+),具有试剂用量小、后续固废处理容易的优势。

Effect of Sr^2＋on the biomineralization process of CaCO_3 was studied with egg white as an inducer.The regulatory mechanism was investigated using the characterization results of scanning electron microscopy,X-ray diffraction and Fourier transformation infrared spectroscopy. On this basis,the adsorption of biomimetic mineralization of CaCO_3 on Sr^2＋was further studied. The results show that Sr^2＋has no impact on the mineralization process of CaCO_3 when it is added alone. However when it acts with egg white,acicular aragonite CaCO_3 is prepared. The adsorption rate of mineralization increases with the increase of the Sr^2＋concentration,reaching the maximum of 100 mg/L,and then keeps stable. Although the adsorption rate of direct precipitation method on Sr^2＋is significantly higher than that of the gas diffusion method,the gas diffusion method combined with biomimetic mineralization has obvious advantages including less treatment reagent and easy treatment process on follow-up solid waste. Therefore,it has a better application prospect.