聚酯无纺布浸渍聚酯基硫脲树脂对Au(Ⅲ)的吸附行为

Adsorption of Au(Ⅲ) to Poly (ethylene terephthalate) Dipped by Polymeric Thiourea Resin

采用浸渍法制备了聚对苯二甲酸乙二醇酯(PET)-聚酯基硫脲树脂(PDTU)无纺布纤维复合材料PET-PDTU。PET-PDTU对Au(Ⅲ)的吸附容量可达4.24 mmol/g,30℃下吸附速率常数k=0.004 04 min-1;吸附过程符合G.E.Boyd液膜扩散方程,液膜扩散为吸附主控步骤;等温吸附过程可由Langmuir模型描述,为单分子层吸附;吸附热力学证明,反应过程为吸热过程,焓变ΔH=40.00 kJ/mol。

A new composite material,poly（ethylene terephthalate）-polymeric thiourea resin,was prepared by dipping method.The adsorption of Au（Ⅲ） was studied by batch method.Maximum adsorption capacity of PET-PDTU for Au（Ⅲ） reached 4.24 mmol/g,and the rate constant k=0.004 04 min^-1;G.E.Boyd Equation adequately fits the sorption rate before equilibrium,which confirms that the film diffusion controlls the sorption process.The equilibrium sorption data can be described by the Langmuir isotherm equation,which implies the monomolecular sorption in these systems.It was also proved from the thermodynamics that the sorption process was endothermal,and the enthalpy change ΔH calculated was 40.00 kJ/mol.