Takeshi Moriguchi - Photo-Fenton Reaction of Dyes with Fe(III)-Treated Hydroxyapatites as Heterogeneous Catalysts in Water

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      Publication Details (including relevant citation   information):

      Takeshi   Moriguchi, Souhei Nakagawa:Phosphorus Research Bulletin,   26, 117-130 (2012).

      Abstract:

      Fe(III)-treated   hydroxyapatites, HAP-300-Fe and HAP-400-Fe, were prepared from   hydroxyapatites, HAP-300 (stoichiometric type) and HAP-400   (Ca-deficient type), respectively, and applied to photo-Fenton   reaction of dyes as heterogeneous catalysts in comparison with   other Fe catalysts such as Fe2O3,   FePO4•2H2O, and FeOOH. Among the Fe   catalysts, HAP-400-Fe revealed the highest consumption and   mineralization in photo-Fenton reaction of alizarin red S (ARS),   and also indicated good catalytic activity to other dyes,   alizarin, neutral red, methyl red, methyl orange (MO), Congo red,   and indigo carmine. Generation of hydroxyl radical •OH as an   oxidation species from H2O2 was observed in   the all Fe catalysts by an indirect method using N,   N-dimethylamino-4-nitrosoaniline, which is exclusively sensitive   to •OH. In order to elucidate catalysis mechanism of Fe   catalysts, kinetic investigation based on Michaelis-Menten theory   was conducted in the reaction of ARS and MO. As a result,   HAP-400-Fe indicated high ability of bearing many dye molecules   but low degradative catalysis ability to   H2O2, compared with   Fe2O3. However, judging from high   mineralization ability as well as repeating availability (5   times), HAP-400-Fe is considered as an excellent heterogeneous   catalyst for photo-Fenton reaction.

      Address (URL): https://www.jstage.jst.go.jp/article/prb/26/0/26_117/_article