The role of adsorption in decomposition of dyes on TiO2 and N-modified TiO2 photocatalysts under UV and visible light irradiations
The role of adsorption in decomposition of dyes on TiO2 and N-modified TiO2 photocatalysts under UV and visible light irradiations
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DOI：
10.1016/j.materresbull.2012.06.038
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发表时间：
2012-11
影响因子：
5.4
通讯作者：
Kamila Bubacz;B. Tryba;A. Morawski
中科院分区：
文献类型：
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作者：
Kamila Bubacz;B. Tryba;A. Morawski
考察了tio2基光催化剂对染料分解的光活性。结果表明，光催化剂表面zeta电位和PZC（点零电荷）以及溶液pH对亚甲基蓝（MB）和活性红198 （RR198）的吸附有较大影响。这些染料通过OH自由基攻击和光孔直接氧化两种方式进行光催化分解。后者在污染物与光催化剂表面接触较好的情况下效率更高，在可见光照射下占主导地位，形成少量OH自由基。前者在紫外光照射下表现强劲，是染料分解的关键因素，无论其吸附能力如何。
Photoactivities of TiO2based photocatalysts towards dyes decomposition was studied by consider their adsorption abilities. It was proved that zeta potential and PZC (point zero charge) of photocatalyst surface as well as pH of solution strongly influenced adsorption of tested dyes, Methylene Blue (MB) and Reactive Red 198 (RR198). These dyes underwent the photocatalytic decomposition by two ways, OH radicals attack and direct oxidation with photogenerated holes. The latter one is more efficient in case of better contact of pollutant with the photocatalysts surface and is dominant under visible light irradiation, where insignificant amount of OH radicals is formed. The former one is powerful under UV irradiation and is a key factor in decomposition of dyes regardless of their adsorption abilities.