沙质滩涂颗粒物对磷酸盐的吸附过程研究

Adsorption Characteristics of Phosphate on the Sandy Tidal

以沙质滩涂颗粒物对磷酸盐的吸附过程为对象,通过拟一级和拟二级方程进行吸附动力学研究,采用Langmuir和Freundlich方程描述平衡吸附等温线,并计算得到吸附热力学参数。结果表明:拟二级动力学模型能够较好拟合吸附过程,Langmuir模型能更好的描述吸附等温线,吸附是焓推动作用、自发且放热的过程。

The adsorption of phosphate on sandy beach particles was studied. Adsorption kinetics were evaluated by pseudo - first and pseudo - second order model, adsorption isotherms were fitted by Langmuir and Freundlich model, and thermodynamics parameters were calculated. The results showed that the adsorption kinetics was identical with pseudo - second order equation, Langmuir model fitted better with adsorption isotherms, and the negative values of thermodynamic parameters indicated a spontaneous, exothermic and enthalpy promoting process.