鸡蛋壳对磷的吸附特性研究

通过研究时间、温度、磷初始浓度、pH和灼烧温度等因素对磷在鸡蛋壳上吸附的影响.结果表明,鸡蛋壳在吸附的初始阶段(0～2h),吸附量上升很快,此后趋于平缓,鸡蛋壳对磷的动力学吸附过程很好地遵循准一级动力学模型;吸附热力学研究表明鸡蛋壳吸附磷过程中,系统的△G~0<0,△H~0>0,鸡蛋壳对磷的吸附作用是一个自发的吸热过程;鸡蛋壳对磷的等温吸附可采用Freundich等温模型拟合,相关性达到显著水平;鸡蛋壳在酸性条件下吸附量远远大于在碱性条件下的吸附量;随着灼烧温度升高,单位吸附量上升.

STUDY ON PHOSPHATE ADSORPTION CHARACTERISTICS OF EGGSHELL

Effect of reaction time, temperature, initial concentration of PO_4~(3-), pH and calcinations temperature on phosphorus adsorption is experimentally studied. The result indicates that the phosphorus adsorption capacity of eggshell increases rapidly at the beginning of adsorption process (0～2 h), and then decreases slowly. The adsorption kinetics can be described by the pseudo-first order model. Thermodynamic parameters such as △G~0,△H~0 is calculated during the phosphorus adsorption, △G~0 is negative and △H~0 is positive indicating that the adsorption reaction of phosphorus is spontaneous. The isothermal adsorption process of phosphate on eggshell can be fitted by Freundich equations with high correlation coefficient; the adsorption capacity in the condition of acidity is much higher than its in alkalescency; the capacity of adsorption increased as the calcinations temperature increased.