微波改性废酵母菌吸附废水中铜(Ⅱ)离子热力学动力学研究

通过大量的实验研究了应用低成本吸附剂废酵母菌在微波改性后去除废水中重金属铜(Ⅱ)离子,并通过改变反应过程中的pH值、反应时间、初始浓度、废酵母菌投加量、反应温度等因素来影响吸附效果。研究结果表明:在pH值为7.0、反应时间为90min、温度为55℃、Cu2+初始浓度为40mg/L、微波改性废酵母菌投加量为4g/L时,微波改性酵母菌的最大吸附容量为41.84mg/g。吸附过程符合Langmuir吸附等温模式。吸附过程的热力学常数△G0、△H0和△S0分别为-6.12kJ/mol、9.2kJ/mol和48.19kJ/mol。说明废酵母菌对Cu2+的吸附是自发的吸热反应。微波改性废酵母菌对Cu2+的吸附动力学模型能够较好地符合准二级动力学方程。

Thermodynamic and Kinetic Study of Sorption of Cu2+ in Polluted Water

Based on large number of experiments,this paper investigates the application of low-cost adsorbent waste yeast after microwave modification to removing Cu2+ from wastewater.In the investigation,the paper studies the changes of adsorption efficacy by changing the pH of the reaction process,reaction time,initial concentration,the waste yeast dosage,reaction temperature and other factors.The results show that the maximum adsorption capacity of the microwave modified yeast is 41.84 mg /g when pH is 7.0,reaction time is 90min,the temperature is 55 °C,initial concentration of Cu2+ is 40 mg / L,and dosage of microwave modified waste yeast is 4g / L.The adsorption process measures up to the Langmuir adsorption isotherm model.In the adsorption process,thermodynamic constants △G0 △H0 and △S0 are-6.12 kJ/mol,9.2 kJ/mol and 48.19 kJ/mol,which show that the waste yeast adsorption of Cu2+ is spontaneous and endothermic reaction.It is proved by the investigation that the adsorption kinetics model of microwave modified waste yeast can better meet the quasi-second order kinetics equation.