天然硅藻土吸附废水中Cd^(2+)和Pb^(2+)的热力学研究

Thermodynamic study on the adsorption of Cd^(2+) and Pb^(2+) in wastewater by natural diatomite

用天然硅藻土吸附废水中Cd2+和Pb2+两种重金属离子,探讨了天然硅藻土对Cd2+和Pb2+的吸附等温式和吸附热力学规律。结果表明:天然硅藻土对Cd2+和Pb2+的平衡吸附量随温度的升高而增加。两种重金属离子的吸附等温式都与Langmuir方程符合更好。由热力学参数可知吸附过程是自发、吸热的过程。

Natural diatomite was used to adsorb Cd2＋ and Pb2＋ from wastewater.The adsorption capabilities such as adsorption isotherms and thermodynamics of Cd2＋ and Pb2＋ by natural diatomite have been investigated.The results demonstrated that the amount of equilibrium adsorption increases with the increase of temperature.The adsorption isotherms of two heavy metal ions accord with the Langmuir equation better.The thermodynamic parameters are showed that the adsorption process is spontaneous and endothermic.