摘要
采用等温吸附法研究了Pb^2＋在铁锰复合氧化物上的吸附特征,溶液pH值、离子强度、温度对吸附过程的影响及反应的热力学特征.研究结果表明,铁锰复合氧化物对Pb^2＋具有较强的吸附能力,吸附率最大可达97.56%;等温吸附以Langmuir方程拟合效果最佳,Freundlich方程次之.在相同离子强度、温度条件下,pH值在4.0-8.0范围内,随着pH值的升高,铁锰复合氧化物对Pb^2＋最大吸附量Qmax增大,吸附力常数K亦呈增加的趋势.在相同pH值和温度下,当离子强度从0增加为0.01mol/L时,铁锰复合氧化物对Pb^2＋吸附量增加;但当离子强度从0.01mol/L上升为0.1mol/L时,其对Pb^2＋的吸附量呈减小的趋势.热力学试验表明,随着温度的升高,Pb^2＋在铁锰复合氧化物上的吸附量减少,反应是自发进行的放热反应,较低温度有利于反应进行.
The adsorbing behaviors of Pb^2＋ ions on Fe-Mn ionic strength and temperature on the adsorption process, composite oxide （FMO） , the influences of pH, and the thermodynamic characteristics of the re action were studied by the isothermal adsorption method. The results showed that FMO had a strong absorbability to Pb^2＋ , with a maximal adsorption rate of 97.56%. The absorption process was best fitted by the Langmuir equation, followed closely by the Freundlich equation. At fixed ionic strength and tempera ture, highest adsorption capacity （Qmax） and adsorption constant （K） both increased with rising pH in the range of 4.0 to 8.0. At fixed pH and temperature, the adsorption capacity of FMO to Pb^2＋ increased when ionic strength increased from 0 to 0.01 mol/L, and decreased when ionic strength increased from 0.01 mol/L to 0.10 mol/L. A thermodynamic experiment showed that the adsorption of Pb^2＋ on FMO was reduced with increasing temperature, that the reaction was a spontaneous exothermic reaction, and that lower temperature was conducive to the adsorption reaction.
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第7期135-142,共8页
Journal of Southwest University(Natural Science Edition)
基金
国家留学基金资助项目(201206995025)
重庆市自然科学基金资助项目(CSTC
2008BB7099)
中央高校基本科研业务专项资金资助项目(XDJK2010C041)
西南大学生态学重点学科"211工程"建设经费资助
关键词
铁锰复合氧化物
PB^2+
吸附
热力学参数
Fe-Mn composite oxide （FMO）
Pb^2＋ ion
adsorption
thermodynamic parameter
