1. Synthesis of a CaO-Fe2O3-SiO2 composite from a dephosphorization slag for adsorption of CO2.
- Author
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Hashim, Zaza Hazrina, Kuwahara, Yasutaka, Hanaki, Aiko, Mohamed, Abdul Rahman, and Yamashita, Hiromi
- Subjects
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CARBON sequestration , *SLAG , *SCANNING transmission electron microscopy , *CARBON dioxide adsorption , *CHEMICAL processes , *X-ray photoelectron spectroscopy , *CARBON emissions - Abstract
The issue of excess slag waste generated in the iron and steel making industries has prompted investigations on the use of the slag waste. The objective of this study is to develop an adsorbent capable of capturing carbon dioxide (CO 2) by using waste slag. A mesoporous CaO-Fe 2 O 3 -SiO 2 (CFS) composite was synthesized from a dephosphorization steel slag, using Pluronic 123 as a template and various acids, including formic acid (FA), hydrochloric acid (HCl), and nitric acid (HNO 3). The morphological and physicochemical features of the prepared samples were determined using scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and N 2 adsorption-desorption measurements. The capability of the adsorbent to capture CO 2 was investigated in repeated CO 2 adsorption cycles. In comparison to other samples, the slag-derived adsorbent synthesized using formic acid (deP-CSF(FA)) exhibited the highest CO 2 adsorption capacity (17.0 wt% per mass of adsorbent) and better regenerative ability. A regenerative CaO-based adsorbent synthesized from a dephosphorization slag that is environmentally friendly and economical, as well as having a high capacity for CO 2 adsorption and reuse, is advantageous for reducing CO 2 emissions from the iron and steel making industry and will undoubtedly contribute to the industry's long-term sustainability. A CaO-Fe 2 O 3 -SiO 2 composite was synthesized from dephosphorization slag and applied for CO 2 adsorption [Display omitted] • A CaO-based adsorbent is produced from dephosphorization slag through a facile chemical process. • The adsorbent prepared with formic acid and P123 exhibits the highest CO 2 adsorption capacity. • The slag-derived adsorbent also shows a faster adsorption rate and better cycling stability. • This works provides a simple and low-cost method to prepare CaO-based adsorbent from waste steel-making slag. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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