title: Adsorption of Antimony by Bagasse Fly Ash: Chemical Modification and Adsorption Mechanism.
abstract: Modification of bagasse fly ash (BFA) and the adsorption mechanism of antimony (Sb) by modified BFA were studied. It was found that BFA grafted with acrylic acid (BFAG) and BFA treated with hydrochloric acid (BFA/HCl) led to a decrease in the pH of the zero point of charge (pHzpc) of the adsorbents. The pHzpcof BFA, BFAG, BFA/HCl and activated carbon (AC) were 8.3, 6.4, 6.2 and 8.2, respectively. The maximum adsorption capacities (Qmax) of Sb by BFA, BFAG, BFA/HCl and AC were 0.14, 0.34, 0.38 and 0.29 mg Sb/g adsorbent, respectively. Modified BFA had Qmaxhigher than AC although the BET surface area of AC was the highest. This was due to the system pH of BFAG and BFA/HCl was 5.20-6.00 and the pHzpcof BFAG and BFA/HCl accounted for 6.4 and 6.2, respectively. Therefore, the adsorbent surface had a positive charge, resulting in increasing adsorption of Sb.
authors.affiliation: The Joint Graduate School of Energy and Environment, King Mongkut's University of Technology Thonburi, Bangkok 10140, Thailand.
authors.forename: Piyawan
authors.initials: P
authors.lastname: Leechart
authors.forename: Duangrat
authors.initials: D
authors.lastname: Inthorn
authors.forename: Paitip
authors.initials: P
authors.lastname: Thiravetyan
mesh_terms: D000327:Adsorption; D000965:Antimony / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D002606:Charcoal / Q000737:chemistry; D060729:Coal Ash / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D060729:Coal Ash; D014874:Water Pollutants, Chemical; D002606:Charcoal; D002482:Cellulose; C027433:bagasse; D000965:Antimony