光催化氧化法处理染料中间体H酸水溶液

Photocatalytic Oxidation of H-acid in Aqueous Solution

为了去除水中难氧化的有害染料中间体Ｈ酸，研究以ＴＩＯ２、ＺｎＯ、ＣｄＳ和Ｆｅ２Ｏ３为催化剂，采用低压汞灯为光源，对Ｈ酸水溶液进行光催化氧化实验．结果表明：ＴｉＯ２和ＣｄＳ的催化效果最好．采用ＴｉＯ２作催化剂，光催化氧化５ｈ后，Ｈ酸分解率可达９０％，反应速率遵从Ｌａｎｇｍｕｉｒ－Ｈｉｎｓｈｅｌｗｏｏｄ方程，Ｋ＝１２．３Ｌ／ｍｍｏｌ，ｋ＝２５．２×１０－６ｍｏｌ／ｈ．溶液中投加１０ｍｇ／Ｌ的Ｆｅ３＋或Ａｇ＋，可使反应时间缩短２—３ｈ．研究探讨了ｐＨ、ＴｉＯ２投加量和Ｈ酸浓度对催化氧化过程的影响．

Photocatalytic oxidation of H-acid in aqueous solution was investigated by irradiating with a 30watts low pressure mercury lamp and using TiO2,ZnO,CdS,Fe2O3 as catalysts.The results indicated that TiO2 and CdS have higher catalytic activity than ZnO and Fe2O3.H-acid in aqueous solution can be degraded more than 90% during a period of 5 hours irradiation when TiO2 is used as catalyst.The rate of photocatalytic oxidation can be expressed by Langmuir-Hinshelwood Equation,the constants K and k were found by experiment to be K=12.3 L/mmol and k=25.2×10-6 mol/h respectively.The reaction time can be shortened 2-3 hours when 10 mg/L Fe3+ or Ag+ is added in H-acid solution.The effects of dosage of catalyst,pH and concentration of Hacid in the solution on photocatalytic oxidation of H-acid were also studied.