摘要
为准确评价矿化垃圾粒径分布的非均匀和非恒定性对其资源化利用产生的影响,为矿化垃圾的有效资源化利用提供理论依据,采用批量平衡法比较了不同粒径矿化垃圾对Cu^(2+)的吸附行为。结果表明,由于矿化垃圾粒径的不同,吸附初期各粒径矿化垃圾对Cu^(2+)的吸附速率明显不同,其拟合较优模型的相关系数总体上随粒径的减小而减小。其中,0～900μm(混合粒径)、300～900μm、150～300μm、90～105 μm矿化垃圾对Cu^(2+)的等温吸附行为符合Freundlich模型,而105～150 μm和0～90 μm矿化垃圾的等温吸附行为则更适用于Langmuir模型。不同温度(15 ℃、24℃、30℃)下,各粒径矿化垃圾(除150～300μm)吸附的热力学参数均为吸附自由能变化量△G<0、吸附反应的焓变△H>0、熵变△S>O,这表明温度升高有利于吸附的进行,而具体的参数值表明大粒径的自发性大于小粒径,所需的热能和熵增值小于小粒径。
The aim of the present research is to investigate the influence of the characteristics of particle-size aged refuse on the adsorption behavior of Cu^2＋. Therefore, by using the batch-processing method, we have examined the adsorption behavior of Cu^2 ＋ by different particle-size aged refuse. The results of our study reveal that due to the difference in particle-size, their adsorption rates were quite different from each other in the initial reaction time, as well as the correlation coefficient r of fitting model reduced basically with the decrease of the particle-size. The adsorption isotherm of the refuse of different particle-sizes was found to overlap each other in primary reactions. Then the absorption of Cu^2＋ tended to increase with the decrease of the particle-size. Further analysis of the data shows that the adsorption of Cu^2 ＋ by 0- 900 μm （admixture particle-size）, 300- 900 μm , 150 -300 μm, and 90 105 tim aged refuse tends to follow Freundlich isotherm more closely, but 105 -150 μm and 0 - 90 μm samples tend to fit Langmuir isotherm. Afterwards, we have also evaluated the thermodynamic parameters, such as Gibbs free energy （△G）, standard enthalpy （ △H） and standard entropy （ △S ）. The adsorption of △H （except 150- 300 μm aged refuse） and AS was found positive whereas A G negative, which shows that the adsorption of Cu^2＋ by different particle-sizes aged refuse was spontaneous and endothermic by nature with the values of AH and AS significantly ascended with the decline of the particle-size of the refuse. Thus, it can be concluded that the particle-size distribution has a great impact on the adsorption of Cu^2＋ by aged refuse. Therefore, this is a point that should be attached more attention into for its better use.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2011年第1期88-91,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(20977060)
山西省自然科学基金项目(2009011046)
山西省留学基金项目(200806)
关键词
环境工程学
矿化垃圾
粒径
CU^2+
吸附
environmental engineering
aged refuse
particle-size
Cu^2＋
adsorption
