Adsorption Properties of Cation Ion-exchange Fiber for UDMH
离子交换纤维对偏二甲肼的吸附性能

Unsymmetrical dimethyl hydrazine (UDMH) and other liquid propellants are widely used in many countries, it causes environmental pollutions and is proved to be toxic to mankind. A kind of strong acid cation ion exchange fiber (IEF) was used to adsorb UDMH in this work. Adsorption behaviors were studied by using static and dynamic adsorption methods. Experimental results show that the kinetics of adsorption behavior of the fiber is mainly controlled by film diffusion process. It obeys the Boyd's film diffusion equation. Adsorption reaction rate increases with the increase of temperature. Equilibrium data for the adsorption of UDMH are correlated by Freundlich isotherm equation. Dynamic adsorption results show that the adsorption rate of IEF to UDMH is greater than that of resin, and the former adsorption capacity is 3.86 times larger than that of the latter. This kind of IEF can be used to treat wastewater of UDMH in higher flow velocity condition.