Photodegradation of 2-naphthol in water by artificial light illumination using TiO2 photocatalyst: Identification of intermediates and the reaction pathway
Photodegradation of 2-naphthol in water by artificial light illumination using TiO2 photocatalyst: Identification of intermediates and the reaction pathway
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DOI：
10.1016/j.apcata.2007.09.034
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发表时间：
2008
影响因子：
5.5
通讯作者：
S. Qourzal;Noureddine Barka;M. Tamimi;A. Assabbane;Y. Aît-Ichou
中科院分区：
文献类型：
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作者：
S. Qourzal;Noureddine Barka;M. Tamimi;A. Assabbane;Y. Aît-Ichou
已经在多种条件下研究了二氧化钛 (TiO2) 水悬浮液中 2-萘酚光催化降解的动力学，这从应用角度来看是至关重要的。使用不同的参数（例如 TiO2 类型、催化剂浓度、底物浓度、反应 pH 值）以及在不同电子受体（例如除分子氧之外的过氧化氢 (H2O2)、溴酸钾 (KBrO3) 和过硫酸钾 (K2S2O8)）存在下研究降解情况。发现降解率受到所有上述参数的强烈影响。研究发现，与其他光催化剂相比，光催化剂“Degussa P-25”的效率更高。降解动力学非常符合 Langmuir-Hinshelwood 速率定律。结果发现，在实验条件下，TiO2中Ag+的最佳浓度为5×10−4mol/l时，2-萘酚的降解速度最快。但Na+、K+、Mg2+、Ca2+、Zn2+、Co2+、Ni2+的添加对反应没有明显影响。总有机碳（TOC）分析表明，2-萘酚很容易实现完全矿化。通过HPLC-MS技术对中间产物进行鉴定。可以提出详细的降解途径。
The kinetics of the photocatalytic degradation of 2-naphthol has been investigated in aqueous suspensions of titanium dioxide (TiO2) under a variety of conditions, which is essential from application point of view. The degradation was studied using different parameters such as types of TiO2, catalyst concentration, substrate concentration, reaction pH and in the presence of different electron acceptors such as hydrogen peroxide (H2O2), potassium bromate (KBrO3) and potassium persulphate (K2S2O8) besides molecular oxygen. The degradation rates were found to be strongly influenced by all the above parameters. The photocatalyst “Degussa P-25” was found to be more efficient as compared with other photocatalysts. The degradation kinetics fit well to the Langmuir–Hinshelwood rate law. It was found that an optimal concentration of 5×10−4mol/l Ag+in TiO2achieved the fastest 2-naphthol degradation under the experimental conditions. However, with the addition of Na+, K+, Mg2+, Ca2+, Zn2+, Co2+and Ni2+, there are no obvious effects on the reactions. An analysis of total organic carbon (TOC) showed that a complete mineralization of 2-naphthol can be easily achieved. The intermediate products were identified by HPLC–MS technique. A detailed degradation pathway could be proposed.