Removal of 17β-estradiol by Nylon Filter Membrane: Adsorption Kinetics and Thermodynamics
نویسندگان
چکیده
The natural estrogen 17β-estradiol (E2) is one of the known endocrine disrupting chemicals (EDCs) that have been entering water systems via human and animal waste products. The adsorption kinetics and thermodynamics of nylon membranes used in a filter for the removal of 17β-estradiol (E2) in water were studied. Experimental results showed that a linear adsorption isotherm was applicable over the E2 concentration range from 0.5 mg L to 3.0 mg L. The adsorption obeyed pseudo-first-order kinetics and diffusion-limited model. The rate of adsorption was fast, as controlled by surface adsorption rather than diffusive transport into surface sites. Thermodynamic parameters such as standard change in free energy, enthalpy and entropy indicated that adsorption of E2 on a nylon membrane was exothermic.
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