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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。
Preparation of Mesoporous Fe2O3 Nanoparticles by Gas - liquid Chemical Precipitation Method. Through the equilibrium experiment, the thermodynamic and kinetic properties of Congo red adsorbed by Fe2O3 were studied. The results showed that the adsorption isotherms of Congo red conformed to the Langmuir equation, and the higher the temperature, the larger the adsorption capacity. The calculated parameters show that the adsorption of mesoporous Fe2O3 on Congo red is a spontaneous and endothermic process. At the same time, the equilibrium solution of 35 mg / L Congo red solution can be obtained within 6 h. The adsorption kinetics of Congo red by Fe2O3 accords with the second-order adsorption kinetics model, mainly by chemical adsorption.