摘要
碳羟基磷灰石(CHap)对水溶液中镉离子的吸附过程是一个复杂的非均相固液反应过程,从动力学角度来看,大致可分为两个阶段:初期阶段反应速度快,动力学过程复杂;后期阶段反应速度较慢,并符合一级反应动力学方程。实验表明:反应速率常数k1与温度T之间的关系符合阿累尼乌斯公式,吸附的活化能为Ea=6.075J/mol,吸附的频率因子A=220s-1。同时,k1与镉离子初始浓度呈负相关性,与介质pH值、CHap用量呈正相关性。
The absorption of aqueous Cadmium on carbonate-hydroxyapatite (CHap) is a complicated non-homogeneous solid/water reaction, which can be described by two stages from kinetic point of view. At the stage,reaction rate is so fast that its kinetic course is intricate, which requires further research. At the stage, the rate of reaction becomes slow and the process of reaction accords with one order reaction kinetic equation. Experimental results show that the relationship between reaction rate constant k_1 and temperature T accords with Arrhenius Equation, and the activation energy of absorption E_a is 6.075 J/mol and frequency factor A is 220 s^(-1). At the same time, reaction rate constant k_1 increases with Cd^(2+) initial concentration decrease,and kl decreases with pH and CHap dosage increase.
出处
《矿物岩石》
CAS
CSCD
北大核心
2004年第1期108-112,共5页
Mineralogy and Petrology
基金
武汉市科技局科技开发基金资助项目(项目编号:20026002098)
关键词
碳羟基磷灰石
镉离子
吸附
动力学
carbonate-hydroxyapatite
cadmium ion
absorption kinetics
