Decolorization of Acid Black 48, Methyl Orange and Methyl Blue by TiO_2

摘要

A mesoporous TiO2 catalyst was synthesized by a hydrothermal method using cetyltrimethyl ammonium bromide (CTAB) as a structure-directing agent. The adsorption abilities of the catalyst for the removal of acid black 48(ABk48), methyl orange (MO) and methyl blue (MB) from waste waters were investigated. The adsorption data for ABk48, MO and MB fit well with both the Langmuir or Freundlich adsorption models. The absorption efficiency is strongly correlated to the initial amount of absorbent, dye concentration and reaction time. As the absorbent amount and reaction time is increased, the absorption efficiency directly increases. Absorption efficiency decreases with increased initial dye concentration and temperature. The maximum adsorption of ABk48, MO and MB onto TiO_2 were 90, 91and 100% at 50min, respectively. The results also showed the efficiency of decolorization linearly increased as the amount of TiO_2 absorbent increased from 0.1 to 0.6g. The maximum absorption efficiency was 100% at 5ppm of dye concentration with TiO_2.