title: Characterization of coal gasification slag-based activated carbon and its potential application in lead removal.
abstract: Highly porous activated carbons were prepared from a coal gasification slag (CGS) precursor, by KOH activation to remove Pb2+from aqueous solution. The effects of pretreatment methods and activation parameters on the properties of the activated carbon were investigated, such as KOH/CGS mass ratio, activation temperature and activation time. The results showed that the maximum Brunauer-Emmett-Teller surface area and total pore volume with the value of 2481 m2g-1and of 1.711 cc g-1were obtained at a KOH/CGS ratio of 3.0 by physical mixing, an activation temperature of 750°C and an activation time of 80 min. SEM, FTIR and EA analyses indicated that pronounced pores existed on the exterior surface of the activated samples, and the contents of H and O decreased due to the loss of surface chemical groups during activation. Experimental data for the Pb2+adsorption were fitted well by Freundlich equation and a pseudo-second-order model with a maximum experimental adsorption capacity of 141 mg/g. All of the results indicated that CGS could be a promising material to prepare porous activated carbon for Pb2+removal from wastewater.
authors.affiliation: a College of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Yiting
authors.initials: Y
authors.lastname: Xu
authors.affiliation: a College of Environmental Science and Engineering , Tongji University , Shanghai , People's Republic of China.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Chai
mesh_terms: D000327:Adsorption; D002606:Charcoal / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D007854:Lead / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods*; D014866:Waste Products / Q000032:analysis*
chemical_list: D007220:Industrial Waste; D014866:Waste Products; D002606:Charcoal; D007854:Lead
keywords: Coal gasification slag; KOH activation; adsorption; highly porous activated carbon; lead