MgO modified sucrose-derived porous carbon composite for fluoride adsorption

Fluorine is an essential trace element for human skeletal and teeth health, while excess intake of fluoride induces many kinds of diseases. The national standard for fluoride concentration in drinking water quality in China is less than 1.0 mg L-1. -1 . Developing effective and environmental friendly approach to remove fluoride from water especially with high fluoride concentration in low cost is quite necessary. Herein, fluoride removal by MgO modified sucrose-derived porous carbon composite (MPCC) in batch and fixed-bed column systems was studied. The maximum fluoride adsorption capacity of MPCC was 26.6 mg g -1 at 25 degree celsius. Common anions Cl-,- , SO42-and 4 2- and NO3- 3- showed negligible effect on fluoride removal, while a negative impact was observed with co-existence of HCO3-. 3- . The fluoride adsorption kinetic was well fitted with Langmuir adsorption model and the adsorption mechanism was ion exchange reaction between-OH and F-.- . The fluoride concentration can be successfully lowered down to the acceptable level of environmental standard for high concentration influent fluoride. The MPCC composite exhibited excellent regeneration performance, endowing it as promising adsorbent for re- mediation water with fluoride pollution.