Watersoluble phenazine dyes such as Neutral Red, Safranin T, and Janus Green were selected for this investigation.
Phenazine dyes; Neutral Red, Safranin T, and Janus Green were obtained from Merck (Darmstadt, Germany).
Here, in this study, the influence of hydrogel ionogenity and hydrophilicity on the swelling behavior, adsorption and decolorization of the phenazine dyes such as Neutral Red, Safranin T, and Janus Green were investigated, too.
3 for Janus Green. The calculated kinetic parameters are tabulated in Table 4.
To observe uptake of some dyes PAAm or PHA hydrogels were placed in aqueous solutions of cationic phenazine dyes such as Neutral Red, Safranin T and Janus Green, and the aqueous solutions of anionic dyes such as alizarin yellow R, eosin yellowish, naphtol green, bromocresol purple, congo red, indigo blue, and evans blue, and allowed to equilibrate for 2 days.
The largest [k.sub.F] values in both hydrogels were found for Janus green. According to the size of the [k.sub.F] value, the PHA hydrogel containing EGDMA and the Janus green system appear to be the best binding system.
Conversely, as it can be seen from Table 7, the best binding by PHA-EGDMA and PHA-NNMBA hydrogels is binding of Janus Green.
This work has given the quantitative information on the swelling and binding characteristic of the phenazine dyes such as Janus Green, Neutral Red and Safranin T with PHA hydrogels.
Second-order swelling kinetics curves of PHA hydrogels in Janus Green solutions, *; PHA crosslinked with EGDMA, (); PHA cross-linked with NNMBA.