Removal of reactive red 198 from aqueous solution by Ce(IV)

The textile dyeing industry consumes large quantities of water and produces large volumes of wastewater from different processes in dyeing and finishing processes. At present, rare earth application in wastewater treatment has become more and more widely, according to the fact that the Ce(IV) has the strong oxidation ability under acid condition, we have studied the application of Ce(IV) in dyeing industry wastewater treatment originally. Ce(IV) formed [Ce(OH)x·nH2O](4–x)+after hydrolyzation and Ce (III)obtained after Ce(IV) reduction formed [Ce(OH)x·nH2O](3–x)+ after hydrolyzation, these hydrate had big specific surface area, could absorb the reactive red dye 198 (RR198) from aqueous solution. Batch experiments were performed to investigate the effect of physico-chemical parameters, such as pH (pHoptimum<1), type of acid ( sulfuric acid, nitric acid and chloridric acid), dose of cerium sulfate (1.2 g/L), initial dye concentration (10-1000) based on contact time (90-600 sec). Equilibrium data were analyzed using Langmuir ,Freundlich and Temkin isotherm models, hence equilibrium data fitted well with the Langmuir isotherm model. The Ce(IV) was one kind of latent good water treatment chemical reagent.

کلیدواژه ها:

Reactive red ، Aqueous solution ، Rare earths ، Ce (IV) ،