纳米氧化铁对钍(IV)的吸附研究

Adsorption of Thorium (IV) from Aqueous Solutions by Ferric Oxide Nanoparticles

研究了纳米氧化铁对水溶液中钍的吸附行为。结果表明吸附行为受溶液pH值的影响较大,钍初始浓度为20mg/L、pH4.0时吸附率达到95.7%。随着离子强度的增加,吸附率下降。在研究范围内,纳米氧化铁对钍的吸附动力学特性可采用准二级动力学模型进行描述,其吸附等温线数据符合Langmuir吸附等温线模型。热力学分析表明,钍在纳米氧化铁上的吸附是一个自发的吸热过程。

The adsorption behaviors of thorium(IV) from aqueous solutions by ferric oxide nanoparticles were investigated. The experimental results showed the adsorption rate of ferric oxide nanoparticle to thorium was affected greatly by pH value of aqueous solutions and the adsorption rate of the thorium ions was 95.7% at the initial concentration of thorium 20 mg/L and pH 4.0.In addition the adsorption rate decreased with the increase of ionic strength. The adsorption kinetic characteristic for ferric oxide nanoparticle to thorium was depicted betterly by pseudo-second-order kinetic model and the isothermal data for adsorption of ferric oxide nanoparticles to thorium followed the Langmuir isothermal models. The thermodynamic analysis indicated the adsorption of thorium onto ferric oxide nanoparticles was a spontaneously endothermal process.