海水电沉积作用碳酸钙结晶与珊瑚骨骼晶体的比较

发布时间：2018-04-24 07:30

  本文选题：电沉积 + 碳酸钙结晶　； 参考：《海洋科学》2017年07期

【摘要】：电沉积促进珊瑚生长和岸礁修复技术是国际上常采用的生态修复方法,但电沉积技术中电流条件与沉积晶体之间的关系却鲜有研究,关于其形成的电沉积物的晶体结构的报道更是少有。本文探索了在不同电流密度的条件下海水形成碳酸钙晶体的特点,并与珊瑚骨骼晶体进行了对比。本实验设置了300、600、900和1200 m A/m2四组电流密度,在海水中进行5 d电沉积反应,实验后称量了阴极上形成的电沉积物质量,用扫描电子显微镜和X-射线衍射分析了电沉积物中晶体特点并与珊瑚骨骼进行了比较。结果发现,随着电流密度增大,电沉积物质量增加,电流密度为600 m A/m2条件下电沉积物形成的速率与南海的滨珊瑚的生长速率相当。在各个电流密度梯度条件下形成的晶体均与珊瑚骨骼的晶体结构相似。较低电流密度下电沉积物中碳酸钙比例较高。其中,在电流密度为600 m A/m2的条件下,形成的沉积物碳酸钙文石比例最高,和珊瑚骨骼晶体最为接近。本研究为促珊瑚生长的电沉积技术提供了基础数据和理论。
[Abstract]:The techniques of promoting coral growth and shore reef restoration by electrodeposition are commonly used in the world. However, the relationship between current conditions and sedimentary crystals in electrodeposition is seldom studied. There have been few reports of the crystal structure of the resulting electrodeposits. In this paper, the characteristics of calcium carbonate crystals formed in seawater at different current densities are investigated and compared with coral skeletal crystals. Four groups of current densities of 300600900 and 1200 m A/m2 were set up in this experiment. The electrodeposition reaction was carried out in seawater for 5 days. After the experiment, the mass of electrodeposition formed on the cathode was measured. The crystal characteristics in electrosediment were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD) and compared with coral bones. The results show that with the increase of the current density, the mass of the electric sediment increases, and the rate of the formation of the electric sediment at the current density of 600m A/m2 is similar to the growth rate of the littoral coral in the South China Sea. The crystals formed at various current density gradients are similar to those of coral bones. The proportion of calcium carbonate in electrodeposition is higher at lower current density. At the current density of 600m A/m2, the ratio of calcium carbonate stone formed in the sediment is the highest, which is the closest to the coral skeleton crystal. This study provides the basic data and theory for the electrodeposition technology to promote coral growth.
【作者单位】： 中国科学院南海海洋研究所中国科学院热带海洋生物资源与生态重点实验室;中国科学院南海海洋研究所广东省应用海洋生物学重点实验室;中国科学院海南热带海洋生物实验站;中国科学院大学;
【基金】：国家自然科学基金(No.3137099,41106107和2014BAC01B03)~~
【分类号】：P746
，

本文编号：1795716