Preparation of PVA/CS/Ce(NO_3)_3 blend fiber felt and its adsorbability to Cr(VI) ions

Polyvinyl alcohol(PVA),chitosan(CS) and cerous nitrate(Ce(NO3)3) were dissolved in diluted acetic acid and resulting solution was electrospun into PVA/CS/Ce(NO3)3 blend nanofiber felt.Scanning electron microscopy(SEM) was used to characterize the morphology of the nanofiber felt before and after its adsorption of Cr(Ⅵ);Fourier transform infrared spectrum(FT-IR) was used to study the action of Ce(NO3)3 to CS and PVA;and dihpenyl carbon acydihydrazine spectrophotometry was used to study the influence of pH value,time and concentration on the adsorption.The results indicated that the adsorption of Cr(VI) of the nanofiber felt displayed a group-to-group chelating effect,and Ce(NO3)3 changed the molecular structure of CS so that CS was rendered better adsorbability to Cr(Ⅵ) ions.The maximum adsorption was observed when pH=4.Its adsorption isotherm line was conformed to Langmuir adsorption model.The saturated adsorption capacity of the nanofiber felt to Cr(Ⅵ) was 59.81 mg/g,and its removal rate to Cr(Ⅵ) was up to 87%.