鸡蛋壳对磷的吸附特性研究  

STUDY ON PHOSPHATE ADSORPTION CHARACTERISTICS OF EGGSHELL

作　　者：金晓丹[1] 王敦球[1] 张华[1] 游少鸿[1] 苏小浪[1] 陈刘金[1] 张钦库[1] 

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541004

出　　处：《水处理技术》2010年第4期56-59,共4页Technology of Water Treatment

基　　金：广西研究生教育创新计划项目(2008105960775M27);国家重大水专项(2008zx070317-02-03);教育部新世纪优秀人才支持计划(NCEF-080619)

摘　　要：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△G0<0,△H0>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。Effeet of reaction time, temperature, initial concentration of PO4^3-, 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 Fretmdich 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.

关 键 词：鸡蛋壳 磷 吸附动力学 吸附等温线 

分 类 号：TQ424.2[化学工程]