Study on the Factors Influencing the Adsorption Mechanism of CSH Gel for Chloride Ions
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<sub>2</sub> and NaCl, with adsorption capacities of 17.45 mg·g<sup>-1</sup> and 8.06 mg·g<sup>-1</sup>, 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.
Authors
- Yan Zheng (ORCID: https://orcid.org/0000-0002-0375-1593)
- Suping Cui (ORCID: https://orcid.org/0000-0002-9685-1154)
- Yali Wang (ORCID: https://orcid.org/0000-0002-2948-3400)
- Shijie Liu (ORCID: https://orcid.org/0000-0003-3286-8958)
- Hongxia Guo (ORCID: https://orcid.org/0000-0003-0903-8382)
Institutions
- North China University of Science and Technology (CN)
- Beijing University of Technology (CN)
Publication Details
- Journal
- Materials
- Published
- 2024-11-08
- DOI
- https://doi.org/10.3390/ma17225464
- Citations
- 4
- Primary Topic
- Aerogels and thermal insulation
- Type
- article
- Field-Weighted Citation Impact
- 0.96
Funders
- National Natural Science Foundation of China
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China