Ca(OH)2 nanosheets fabricated by carbide residue for effective dry desulfurization

Carbide residue, a highly alkaline industrial solid waste generated during acetylene production, is primarily composing of Ca(OH) 2 . In this study, a top-down solid-state redispersion strategy. By synergizing mechanochemical activation with surfactant capping, we achieving the recycling of carbide residue to synthesize Ca(OH) 2 -CTAB anosheet-based desulfurization agent. The resultant material exhibits a significantly enhancing BET specific surface area (30.2 m 2 ·g −1 ) and abundant pore architecture. Comparative evaluations with Ca(OH) 2 -P123 and raw carbide residue revealing the superior performance of the Ca(OH) 2 -CTAB adsorbent, demonstrating a sulfur dioxide adsorption capacity of 2.57 mmol·g −1 is a 2-fold improvement over untreating carbide residue. Furthermore, significantly extends the fixed-bed penetration time to 43869 seconds. Comprehensive characterization through TG, FTIR, BET, SEM, TEM, and AFM elucidating the relationship between the nanosheet morphology and its exceptional desulfurization performance. This work provides a green methodology for upcycling industrial alkaline waste into functional nanomaterials for environmental remediation.