ADSORPTION BEHAVIOR OF CADMIUM AND COPPER COMPOUNDS ON A MIXTURE FA:TiO2

作者：Visa Maria; Duta Anca^*

来源：Romanian Journal of Chemistry, 2010, 55(3): 167-173.

• fly ash
• TiO2
• cadmium
• cooper
• advanced removal
• wastewater treatment
• adsorption

Fly ash (FA) with alkali modified surface, was used in wastewater treatment, for cadmium and copper immobilisation. The FA adsorption capacity can be improved, with differents amounts of TiO2. The adsorption studies were carried out on single substrates (FA and TiO2) and multi proportions mixtures of FA:TiO2. The influence of the TiO2 over adsorption capacity was studied by modifying the ratio FA:TiO2 and by optimizing the contact time. Efficiencies over 99% were obtained after 30 minutes of adsorption. A synergism effect was obtained during the process, caused by the pH modifications towards alkaline values; the cause can be the TiO2 surface activation, to negative charges by hydroxide adsorption, which favours the cation adsorption. The process was kinetically modelled (pseudo-second order kinetic and interparticle diffuson). The highest adsorption rate occurs for an optimized ratio FA:TiO2 = 3:1.

• 出版日期2010-3