CSH凝胶对氯离子吸附机理的影响因素研究

Study on the Factors Influencing the Adsorption Mechanism of CSH Gel for Chloride Ions.

作者信息

Liu Shijie, Cui Suping, Guo Hongxia, Wang Yali, Zheng Yan

机构信息

College of Mechanical Engineering, North China University of Science and Technology, Tangshan 063210, China.

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China.

出版信息

Materials (Basel). 2024 Nov 8;17(22):5464. doi: 10.3390/ma17225464.

DOI:10.3390/ma17225464

PMID:39597288

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11595486/

Abstract

Calcium silicate hydrate (CSH) gel is an important hydration product of cement, significantly influencing the coagulation and hardening processes, as well as the mechanical properties, volume stability, and durability of cement. Moreover, it plays a crucial role in the adsorption of harmful ions. In this study, CSH gel was synthesized through the precipitation of calcium acetate and sodium silicate and was subsequently used to adsorb chloride ions. The results indicated that when the calcium-to-silicon ratio was 1.2, the CSH gel exhibited excellent adsorption performance for chloride ions introduced via CaCl and NaCl, with adsorption capacities of 17.45 mg·g and 8.06 mg·g, respectively. The adsorption of chloride ions in CSH gel primarily occurs due to the physical adsorption of chloride ions on the surface and within the internal pores of the CSH gel, accompanied by a displacement reaction between hydroxide ion and chloride ions.

摘要

硅酸钙水合物（CSH）凝胶是水泥的一种重要水化产物，对水泥的凝结硬化过程以及力学性能、体积稳定性和耐久性有显著影响。此外，它在有害离子的吸附中起着关键作用。在本研究中，通过醋酸钙和硅酸钠的沉淀合成了CSH凝胶，并随后用于吸附氯离子。结果表明，当钙硅比为1.2时，CSH凝胶对通过CaCl和NaCl引入的氯离子表现出优异的吸附性能，吸附容量分别为17.45 mg·g和8.06 mg·g。CSH凝胶中氯离子的吸附主要是由于氯离子在CSH凝胶表面和内部孔隙中的物理吸附，同时伴有氢氧根离子与氯离子之间的置换反应。