Study on adsorption kinetics of octylphenol ethoxylates onto silk fiber

Silk fiber′s adsorption of octylphenol ethoxylates(OPEO) was studied in order to realize high efficiency monitoring and detection of alkylphenol ethoxylates(APnEO) in silk products.The results showed that silk fiber′s adsorption of OPEO fitted Langmuir model,and the adsorption process could be well described by the pseudo-second-order kinetic model.And higher the initial OPEO concentration,smaller the balancing rate constant was,and longer the balancing time was;higher the temperature of OPEO solution,greater the balancing rate constant was.The diffusion into the microspore is a main factor for controlling the silk fiber adsorption of OPEO,but it is not the only factor.The adsorption activation energy is 25.69 kJ/mol in silk fiber of OPEO,which is far lower than that required by chemical adsorption,that is,83.72 kJ/mol.It indicates that physical adsorption dominates the silk fiber absorption of OPEA.