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

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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 TiO 2 photocatalysts led to the direct hydroxylation of naphthalene to α-naphthol. The addition of Fe 3+ , Fe 2+ , Fe 3+ + H 2 O 2 , and Fe 2+ + H 2 O 2 greatly increases the conversion of naphthalene and the yield of α-naphthol in TiO 2 suspensions. The addition of Fe 3+ + H 2 O 2 to a TiO 2 suspension increased the yield to 22.2%. Surface modified-TiO 2 had a significant influence on the hydroxylation reaction. La-Eu/TiO 2 , La-Y/TiO 2 , H 3 PW 12 O 40 /TiO 2 , H 3 PMo 12 O 40 /TiO 2 , Fe/TiO 2 , Ag/TiO 2 , Cu/TiO 2 , and N/TiO 2 enhanced the conversion and yield more than TiO 2 . Fe/TiO 2 has the highest photocatalytic efficiency among these species. ： 研究了共溶剂、电子受体和表面改性等因素对 TiO 2 光催化萘直接合成 α-萘酚反应的影响. 纳米 TiO 2 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 TiO 2 体系中加入 Fe 3+ , Fe 2+ , Fe 3+ + H 2 O 2 和 Fe 2+ + H 2 O 2 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 Fe 3+ + H 2 O 2 时, α-萘酚收率最大, 为 22.2%. TiO 2 经表面改性后所得样品 La-Eu/TiO 2 , La-Y/TiO 2 , H 3 PW 12 O 40 /TiO 2 , H 3 PMo 12 O 40 /TiO 2 , Fe/TiO 2 , Ag/TiO 2 , Cu/TiO 2 和 N/TiO 2 , 萘转化率和 α-萘酚收率均有所提高, 其中以 Fe/TiO 2 光催化效率最高. The ·OH radicals generated on a UV-illuminated TiO 2 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.