Photocatalytic Conversion of Naphthalene to α-Naphthol Using Nanometer-Sized TiO2

The effects of various parameters (co-solvents, electron acceptors, and surface modification) on the direct synthesis of α-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 α-naphthol. The addition of Fe3+, Fe2+, Fe3+ + H2O2, and Fe2+ + H2O2 greatly increases the conversion of naphthalene and the yield of α-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, H3PW12O40/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.

摘要： 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, H3PW12O40/TiO2, 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 ·OH radicals generated on a UV-illuminated TiO2 photocatalyst led to the direct hydroxylation of naphthalene to α-naphthol. We investigated the effects of cosolvents, electron acceptors, and surface modification on the direct synthesis of a-naphthol from naphthalene using photocatalytic processes.Figure optionsDownload as PowerPoint slide