摘要
在分析骨炭基羟基磷灰石基本特性的基础上,重点研究在不同p H、接触时间、初始浓度以及环境温度等条件下样品对F-的吸附性能,并采用吸附动力学、吸附等温式以及吸附热力学方程对实验结果进行分析。结果表明,骨炭中羟基磷灰石含量高且化学稳定性好,是一种低成本的可快速固液分离的羟基磷灰石基吸附材料。该种羟基磷灰石在20℃条件下对F-的吸附量可达8. 35 mg/g,而且吸附过程符合准二级动力学方程和Freundlich吸附等温式,对去除F-的机制主要包括表面络合吸附、离子交换和沉淀。综合而言,骨炭基羟基磷灰石有望成为能够处理实际氟离子污染水体的吸附材料。
On the basis of analyzing the properties of hydroxyapatite derived from bone char,the adsorption properties of fluoride on samples under different p H,contact time,initial concentration and environmental temperature were studied.Moreover,the adsorption kinetic,adsorption isotherm and adsorption thermodynamic model were used to analyze the experimental results.The results showed that bone char possess high content of hydroxyapatite and good chemical stability.It is a low-cost hydroxyapatite based adsorption material that can be rapidly separated from aqueous solution.The adsorption capacity of the hydroxyapatite for F-at 20℃is up to 8.35 mg/g,and the adsorption process for F-conforms to the pseudo-second-order kinetic equation and Freundlich isotherm model.The removal mechanism of F-by the hydroxyapatite mainly includes surface complexation adsorption,ion exchange and precipitation.In general,hydroxyapatite derived from bone char is expected to be an adsorbent for actual fluoride wastewater treatment.
作者
蒋万义
JIANG Wan-yi(Luzhou Junbo Petrochemical Technology Co.,Ltd.,Luzhou,Sichuan 646300,China)
出处
《四川环境》
2021年第6期23-28,共6页
Sichuan Environment
关键词
羟基磷灰石
氟离子
吸附行为
hydroxyapatite
fluoride ion
adsorption behavior
