Acidic and basic sites on [email protected] were determined by the Boehm titration method (Boehm, 1994). Acid sites were neutralized by 0.1 M NaOH, while basic sites were neutralized by 0.1 M HCl. The results clear that [email protected] contains 0.87 and 0.47 mmol/g of acidic and basic sites, so acidic character was mainly controlled in the surface which make it better sorption for cationic dyes (Br.G, To.B) and azo dyes (Tr.B).
The value of DC electrical conductivity (?DC) for ZnONPs is 5.8×10-6 ?1 m-1, but for [email protected] (7.1×10-8 ?1 m-1) which is greater than SVT-PUF (1.23×10-8 ?1 m-1) as adding ZnONPs to PUF change electric properties. The movement of free charge and increasing number of charge carriers can affect on the conductivity 24, thus, ZnONPs increased polar domain and that raise conductivity.
