Abstract
AbstractBackgroundIt is necessary to find an effective method for the removal of dyes and heavy metals from aqueous solutions. In this work, the effects of carboxymethyl‐β‐cyclodextrin (CMCD) on the photocatalytic degradation of Acid Red R (ARR) and photocatalytic reduction of Pb2+ were investigated in TiO2 suspensions, and the synergistic effects on the simultaneous conversion of ARR and Pb2+ in the presence of CMCD were also evaluated.ResultsThe results showed that CMCD can enhance the photocatalytic degradation of ARR and photocatalytic reduction of Pb2+ in a single system with ARR or Pb2+, respectively. When CMCD was added to the mixed reaction system of ARR and Pb2+, the synergistic effects on the simultaneous conversion of ARR and Pb2+ in aqueous solutions were further enhanced. The photocatalytic removal rates of ARR and Pb2+ in the mixed system were markedly enhanced compared with those in the single systems, and the reaction rate constants of ARR and Pb2+ in the presence of CMCD were higher than those in the absence of CMCD.ConclusionsCMCD can simultaneously enhance the photocatalytic removal of ARR and Pb2+ in mixed systems. CMCD‐enhanced photocatalytic technology may be a good alternative for the treatment of wastewaters containing dyes and heavy metal ions. © 2013 Society of Chemical Industry
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