基于煤气化细渣分选富碳组分的多孔材料制备及其对有害气体吸附性能的研究

Characterization studies indicates that gasification slag exhibits a well-developed pore structure, suggesting its potential utility in the synthesis of high-value adsorbent materials. Through carbon sorting and activation processes, the porous architecture of this material can be further optimized, resulting in an enhanced specific surface area. This investigation focuses on the valorization of high-carbon products derived from sorted coal gasification fine slag, with systematic evaluation of sorting technology efficacy and resource utilization potential. Brunauer-Emmett-Teller (BET) analysis was employed to characterize the porosity and specific surface area of processed materials for adsorbent capability assessment. Optimal activation parameters were identified as 900 ℃ activation temperature, duration of 120 minutes, and KOH-toslag mass ratio of 3∶1, under which the resulting material exhibited a maximized specific surface area of 1 063.522 m2/g with enhanced pore structure development. Experiments conducted using a fixed-bed reactor have demonstrated significant adsorption capacities of the modified carbon material for harmful gases, with maximum adsorption capacities for NO and SO2 reaching 4.842 mg/g and 13.629 mg/g respectively, under the specified optimal conditions. An analysis of the adsorption mechanism, employing the pseudo-first order model, Elovich model, and intra-particle diffusion model revealed the complex nature of the adsorption processes. This investigation provides methodological insights for the sustainable management of coal gasification residues while establishing a technical foundation for their high-value applications in environmental remediation technologies.