Removal of Cu(II) from aqueous solutions by adsorption process with anatase-type titanium dioxide.

The experiment was performed in the reactor with suspended anatase-type titanium dioxide particles. The adsorption amount increased rapidly with an increasing pH value from pH 2 to 5 and remained constant over pH 5. The adsorption amount of Cu(2+) increased with temperature from 15 degrees C to 40 degrees C. The adsorption equilibrium constant (K(ads)) was 0.854 and adsorption isotherm of Cu(2+) adsorption on titanium dioxide was more suitable in Langmuir adsorption isotherm than in Freundlich isotherm. The adsorption rate was rapid with an increasing number of UV lamps of 254 nm.