【摘要】 利用微波辅助Na OH对天然沸石进行改性,在单因素实验的基础上对改性条件进行了优化,得出沸石改性的最优实验条件为:Na OH改性液浓度为0.5 mol/L、微波功率480 W、微波辐射时间5 min.探讨改性沸石对Zn2+的吸附行为.结果表明:改性沸石对Zn2+的吸附能力明显增强.在优化实验条件下对质量浓度为50 mg/L的Zn2+的去除率达95.68%.Langmuir吸附模型比Freundlich吸附模型能更好地模拟改性沸石对Zn2+的吸附过程,吸附动力学方程以准二级动力学方程拟合的效果最优.更多还原

【Abstract】 The natural zeolite was modified with Na OH assisted with microwave. On the basis of single factor experiments,the optimization methods were as follows: 0. 5 mol / L of Na OH,480 W of microwave power,5 min of radiation time. The adsorption behavior of the modified zeolite to Zn2 +in waste water was investigated. The results showed that the modified zeolite could greatly enhance absorption capability of Zn2 +. Under the optimum conditions,the removal rate of Zn2 +( 50 mg/L) in water by modified zeolite could be up to 95. 68%. According to the adsorption isotherm curves,the adsorption model of Langmuir was better than Freundlich in simulating this adsorption process. The adsorption kinetics of modified zeolite can be well described by pseudo-second-order kinetic equation.更多还原