Study On Modified Fly Ash For Adsorption Of F^- And Hg²⁺

Ca(OH)₂ was used to modify the fly ash,the objectives of this paper were to confirm the main influence factors of F^- and Hg²⁺ adsorption on the fly ash,to reveal the adsorption capacity,kinetic and thermodynamic characteristics,and to investigate the thermodynamic law of co-adsorption of F^- and Hg²⁺ on the fly ash before and after the modification treatments.Finally,the adsorption mechanism was discussed combining with literatures.The results showed that the dynamic and thermodynamic characteristics of F^- and Hg²⁺ adsorption on the fly ash could be adequately described by the pseudo-second rate equation and Langmuir equation;the maximum adsorption of F^- and Hg²⁺ on the fly ash increased after the treatment by Ca(OH)₂;F^- contributed more to absorption of Hg²⁺ on the fly ash and modified fly ash;and it is possible that F^- and Hg²⁺ can be co-adsorped on the fly ash and modified fly ash.