Enhanced adsorption capacity and selectivity towards strontium ions in aqueous systems by sulfonation of CO2 derived porous carbon
نویسندگان
چکیده
Oxygen-enriched carbon materials derived from carbon dioxide were functionalized using sulfonic acid to remove Sr ions from aqueous solutions. Synthesized sulfonated porous carbon materials (PC-SO3H) showed higher adsorption capacity and selectivity towards Sr than non-functionalized porous carbons (PC). The formation of the C-SO3H functional group in PC-SO3H and its ability to proton exchange with Sr was the main contributor to the enhanced performance. The maximum uptake capacity of Sr by PC-SO3H was 18.97 mg g , which was 1.74 times greater than PC. PC-SO3H removed 99.9% and 97.6% of Sr from aqueous solutions with initial Sr concentrations of 5 mg L 1 and 10 mg L , respectively. Sr adsorption showed rapid kinetics, reaching the adsorption equilibrium within 1 h with high adsorption capacity at equilibrium which is 3.52 times greater than that of PC. Additionally, PC-SO3H selectively adsorbed Sr even in the presence of excess amounts of competing ions. Sulfonation of oxygen-enriched carbon had a significant effect on enhancing the affinity towards Sr and suppressing adsorption towards other competing ions.
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