研究了共溶剂、电子受体和表面改性等因素对TiO2光催化萘直接合成α-萘酚反应的影响.纳米TiO2催化剂在紫外光照射下产生·OH,使得萘羟基化得到α-萘酚.在TiO2体系中加入Fe3+,Fe2+,Fe3++H2O2和Fe2++H2O2时,均可有效提高萘转化率和α-萘酚收率,其中以体系中加入Fe3++H2O2时,α-萘酚收率最大,为22.2%.TiO2经表面改性后所得样品La-Eu/TiO2,La-Y/TiO2,H3PW12O40TiO2,H3PMo12O40/TiO2,Fe/TiO2,Ag/TiO2,Cu/TiO2和N/TiO2,萘转化率和α-萘酚收率均有所提高,其中以Fe/TiO2光催化效率最高.
The effects of various parameters (co-solvents, electron acceptors, and surface modification) on the direct synthesis of a-naphthol from naphthalene using photocatalytic processes were investigated. The·OH radicals generated on UV-illuminated TiO2 photocatalysts led to the direct hydroxylation of naphthalene to a-naphthol. The addition of Fe3+, Fe2+, Fe3++ H2O2, and Fe2t+ H2O2 greatly increases the conversion of naphthalene and the yield of a-naphthol in TiO2 suspensions. The addition of Fe3++ H2O2 to a TiO2 suspension increased the yield to 22.2%. Surface modified-TiO2 had a significant influence on the hydroxylation reaction. La-Eu/TiO2, La-Y/TiO2, H3PWi2O40/TiO2,H3PMo12O40/TiO2, Fe/TiO2, Ag/TiO2, Cu/TiO2, and N/TiO2 enhanced the conversion and yield more than TiO2. Fe/TiO2 has the highest photocatalytic efficiency among these species.
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