Coal gasification fine slag-based high-carbon products:Porous material synthesis and pollutant adsorption

LI Rui; SHI Zhaochen; ZHANG Feng; LIU Xiaqing; SHI Yan; ZHANG Hao; KHUDA B; FAN Meijun; CHEN Yongqiang; ZHANG Yili; WANG Xuebin

doi:10.13247/j.cnki.jcumt.20240601

Abstract：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.Brunau-er-Emmett-Teller(BET)analysis was employed to characterize the porosity and specific sur-face area of processed materials for adsorbent capability assessment.Optimal activation param-eters were identified as 900 ℃ activation temperature,duration of 120 minutes,and KOH-to-slag mass ratio of 3∶1,under which the resulting material exhibited a maximized specific sur-face area of 1 063.522 m2/g with enhanced pore structure development.Experiments conduc-ted using a fixed-bed reactor have demonstrated significant adsorption capacities of the modi-fied 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 proces-ses.This investigation provides methodological insights for the sustainable management of coal gasification residues while establishing a technical foundation for their high-value applica-tions in environmental remediation technologies.