石英砂负载氧化铁吸附除磷的热动力学研究  

Thermodynamic and kinetic investigation of phosphate adsorption on iron-oxide coated sand

作　　者：许光眉[1] 施周[1] 邓军[1] 

机构地区：[1]湖南大学土木工程学院水工程与科学系,长沙410082

出　　处：《环境工程学报》2007年第6期15-18,共4页Chinese Journal of Environmental Engineering

基　　金：教育部博士点基金(20030537370);科技部国际合作基金(2003DFB00002);湖南省科技厅重点项目(03WHY1001)

摘　　要：通过吸附动力学实验及等温吸附实验，考察了在10～40℃的温度条件下石英砂负载氧化铁（IOCS）吸附磷的热动力学性质。结果表明：准二级反应动力学模型及Langmuir等温吸附模型可分别较好地描述IOCS对磷的吸附动力学及吸附等温线实验结果（R^2≥0．98）；吸附速率及吸附容量随温度的增加而增加。吸附速率k从0．0095增加到0．0173，吸附容量从0．06mg／g增加到0．08mg／g。根据标准吉布斯自由能变（ΔG^0〈0）和标准反应焓变（ΔH^0〉0）值判断，IOCS对磷的吸附是自发的、吸热的化学吸附反应。Removal of phosphate from aqueous solution using iron-oxide coated sand （IOCS） was investigated by thermodynamic and kinetic batch experiments in the temperature range of 10 - 40℃. The data obtained from kinetic and isotherm experiments could be well described using pseudo-second-order rate model and Lang- muir isotherm model, respectively. The adsorption rate and capacity increased as temperature increased, k increased from 0. 0095 to 0. 0173 and the adsorption capacity increased from 0.06 mg/g to 0.08 mg/g. The ΔG^0 and ΔH^0 values indicate that the adsorption of phosphate on IOCS is spontaneous and endothermic.

关 键 词：负载型氧化铁 磷 吸附 动力学 热力学 

分 类 号：X131[环境科学与工程—环境科学]