A comparison of sorptive removal of anthraquinone and azo dyes using fly ash from single and binary solutions.

Sorptive removal of an anthraquinone-dye (Acid Blue 127, AB-127) and an azo-dye (Acid Yellow 17, AY-17) from single and binary solutions using fly ash (FA) was compared. The diffuse reflectance infrared Fourier-transform spectra and scanning electron microscopy images were used for analyses of the bare and dye-loaded sorbents. Kinetic results well fit to the McKay equation.

A comparison of basic dye adsorption onto zeolitic materials synthesized from fly ash.

This investigation reveals the adsorption characteristics of two basic dyes, thionine (TH) and safranine T (ST), onto fly ash (FA) and its three zeolitized products prepared at different hydrothermal conditions. Typical two-step isotherms were observed for TH adsorption onto four adsorbents, whereas the isotherms of the larger ST molecules were S-shaped. The adsorption capacities of the zeolitized fly ash (ZFA) estimated from the first plateau region of the TH isotherms was nearly twice the FA capacity.