【作者】 马卓；

【导师】 李鱼；

【作者基本信息】 华北电力大学（北京） ， 热能工程， 2009， 硕士

【摘要】 本文使用Ca（OH）₂改性的粉煤灰吸附溶液中F^-和Hg²⁺,确定了影响粉煤灰吸附F^-和Hg²⁺的主要因素,研究了改性前后粉煤灰吸附F^-和Hg²⁺的能力变化以及吸附动力学、热力学规律,并考察了改性前后粉煤灰同时吸附F^-和Hg²⁺的热力学规律,最后结合文献分析了改性前后粉煤灰吸附F^-和Hg²⁺的机理。研究表明,拟二级动力学方程和Langmuir方程能够很好地描述改性前后粉煤灰吸附F^-和Hg²⁺的动力学和热力学特性;改性后粉煤灰对F^-和Hg²⁺的吸附能力较改性前均有提高;F^-的存在有助于改性前后粉煤灰对Hg²⁺的吸附;改性前后粉煤灰可以同时吸附F^-和Hg²⁺。更多还原

【Abstract】 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.更多还原