纳米有机膨润土对苯酚的吸附性能研究

通过对天然膨润土改性,制备纳米有机膨润土并用于吸附苯酚,探讨了吸附时间、溶液pH、纳米有机膨润土投加量等因素对苯酚吸附的影响。结果表明,吸附在5 min内快速达到平衡,溶液pH可以影响苯酚在溶液中的状态,是影响苯酚吸附性能的重要因素。纳米有机膨润土吸附苯酚的过程可用伪二级反应动力学方程来描述,伪二级吸附速率常数为1.3 g/(mg.min)。吸附等温线符合Langmuir等温方程,在25℃时,Langmuir理论最大吸附容量可达到536.32 mg/g,吸附热力学参数表明吸附过程是自发的、放热的物理吸附过程。

The removal of phenol from aqueous solutions using nano-organo bentonite

The nano-organo bentonite was prepared by modification of natural bentonite, and the obtained nano-organo bentonite was employed to remove phenol in waste water. The effects of react time, pH, dosage of nano-organo bentonite on phenol adsorption were investigated. Batch adsorption experiments showed that the adsorption was reached equilibrium in 5 min, pH was crucial factor that affect the phenol adsorption for it could change the forms of phenol in solution. The dynamic adsorption capacity data were well described by the pseudo-second-order reaction rate model, with the reaction velocity constant of 1. 3 g/(mg · min). Langmuir isotherm were best fitted to the adsorption data, and the higher adsorption capacities of 536. 32 mg/g was found at 25 'C. The thermodynamic parameters suggested that the adsorption of phenol onto nano-organo bentonite was physisorptive, spontaneous and exothermic in nature.