新型介孔碳的制备及对罗丹明B的吸附动力学研究

Synthesis and adsorption kinetics of mesoporous carbon to Rhodamine B

采用SBA-15氧化硅分子筛为模板制备有序介孔碳CMK-3,研究了CMK-3作为吸附剂在水溶液中对罗丹明B的吸附作用,同时研究了初始浓度、pH和温度对吸附的影响。结果表明:随着初始浓度的增大、pH增加和温度升高,吸附量增大,但是在较低的pH下,吸附量增加的较小,当pH较高时,吸附量增加的较多。分别采用拟一级反应和拟二级反应模型考察了吸附动力学,并计算了这些动力学模型的速率常数。拟二级反应模型和实验数据之间有较好的相关性。

Carbon mesoporous sieves CMK-3 has been prepared from SBA-15 materials and been employed as a adsorbent for Rhodamine B adsorption in aqueous solution.It is found that Rhodamine B adsorption capacity depends on initial concentration,pH of solution and temperature.Results show that the adsorption capacity increases with the increasing initial concentration,the pH and temperature.At low pH,the adsorption changes little which the adsorption shows large difference at high pH.The adsorption kinetics was tested with the pseudo-first-order and pseudo-second-order reaction mode1.The rate constants of adsorption for these kinetics models were calculated.The pseudo-second-order chemical reaction model provided the better correlation of data.