Comparative evaluation of commercial and sewage sludge based activated carbons for the removal of textile dyes from aqueous solutions

The sorption of dyes from aqueous solutions on to sludge-based activated carbon have been studied and compared with commercial activated carbon. Adsorption parameters for the Langmuir and Freundlich isotherms were determined and the effects of effluent pH, adsorbent dosage, contact time and initial dye concentration were studied. A pseudo-second order kinetic model has been proposed to correlate the experimental data

Decolorization of simulated spent reactive dye bath using solar / TiO2/H2O2

Different parameters were investigated to evaluate their effect on the process removal efficiency of reactive dye from simulated spent reactive dye bath, by solar / TiO[2] / H[2]O[2], including H[2]O[2] concentration, TiO[2] loading and pH. As a result 99% of reactive dye can be removed at a TiO[2] loading of 400mg/l, H[2]O[2] concentration of 150 mg/l and of pH: 5.2. The effect of photo-catalytic deactivation of TiO2 on reactive dye removal was studied for ten number of cycles, and found that the extent of deactivation was high for each consecutive repeated use