介孔Fe_2O_3的化学沉淀法制备及其吸附性能

Chemical Coprecipitation Synthesis of Mesoporous Fe_2O_3 and Study of Their Adsorption Performance

采用气-液化学沉淀法制备介孔Fe2O3纳米粒子。通过平衡实验,研究了Fe2O3对刚果红的吸附热力学和动力学性能。结果表明,Fe2O3对刚果红的吸附等温线符合Langmuir方程,且温度越高,吸附量越大。计算后得到的参数表明介孔Fe2O3对刚果红的吸附过程是一种自发的、吸热过程。同时,在6 h内,即可对35 mg/L刚果红溶液达到平衡,Fe2O3对刚果红的吸附动力学符合二级吸附动力学模型,主要以化学吸附为主。

Mesoporous Fe2O3 nanoparticles were synthesized by a gas-liquid chemical precipitation method. The thermodynamics and the kinetics of Fe2O3 adsorption on Congo red（ CR） were studied by the set of equilibrium experiment. The results show that the adsorption isotherms were in accordance with Langmuir model,and the parameters indicate that the adsorption was strongly dependent on temperature and the adsorption of CR increased with increasing temperature of the system. The calculated parameters indicate that the adsorption process was determined as an endothelium process and a spontaneous process. Furthermore,the adsorption process reached equilibrium in 6 hours,and the kinetics adsorption of CR can be well described by pseudo-second-order rate.