title: Solid-state conversion of fly ash to effective adsorbents for Cu removal from wastewater.
abstract: Solid-state conversion of fly ash to an amorphous aluminosilicate adsorbent (geopolymer) has been investigated under different conditions and the synthesised material has been tested for Cu2+ removal from aqueous solution. It has been found that higher reaction temperature and Na:FA ratio will make the adsorbents achieving higher removal efficiency. The adsorbent loading and Cu2+ initial concentration will also affect the removal efficiency while the adsorption capacity exhibits similarly at 30-40 degrees C. The adsorption capacity of the synthesised adsorbent shows much higher value than fly ash and natural zeolite. The capacity is 0.1, 3.5 and 92 mg/g, for fly ash, natural zeolite, and FA derived adsorbent, respectively. The kinetic studies indicate that the adsorption can be fitted by the second-order kinetic model. Langmuir and Freundlich isotherms also can fit to the adsorption isotherm.
authors.affiliation: Department of Chemical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia. wangshao@vesta.curtin.edu.au
authors.forename: Shaobin
authors.initials: S
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Li
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhu
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D060729:Coal Ash; D003300:Copper / Q000302:isolation & purification*; D007700:Kinetics; D052638:Particulate Matter / Q000737:chemistry*; D013696:Temperature; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*; D017641:Zeolites / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D060729:Coal Ash; D052638:Particulate Matter; D014874:Water Pollutants, Chemical; D017641:Zeolites; C049037:aluminosilicate; D002244:Carbon; D003300:Copper