The kinetic of photocatalytic degradation of 2,4-DCP and 1-naphthol on hybrids TiO₂/reduced-Graphene Oxide (TiO₂/rGO) obtained with two commercial TiO₂ specimens and different % rGO loadings was investigated under different irradiation conditions (UV only, UV + Vis and Vis only). 2,4-DCP adsorbs strongly on the rGO phase. With the increment of the rGO loading no increment on the overall reaction rate under UV and UV + Vis irradiation is observed, while a very low but not null photoactivity that increases with the increment of %rGO is observed under Vis only irradiation.

It is here proposed for the first time a quantitative kinetic model able to predict the photocatalytic rate of hybrid photocatalysts composed of two phases (whatever the nature of the phases is) with different light absorption and intrinsic reactivity, diverse ability to adsorb the substrate and to partition charge carriers depending on their band alignment. The model is able to decouple the adsorption effect from the kinetic ones.

From the analysis of the adsorption and kinetic data at different rGO loadings emerges that: 2,4-DCP partitions preferentially on the rGO phase; the operational photocatalytic mechanism is based on the band-to-band transition promoted by the UV absorption of the semiconductor; rGO shows a negligible but not null visible photoactivity toward 2,4-DCP; the photo-promoted TiO₂ conduction band electrons are not injected into rGO where 2,4-DCP is mainly adsorbed. In this light some hypothesis are proposed to justify the negative effect of rGO on the overall oxidative photoactivity.

研究了两种商业TiO ₂标本和不同rGO负载量的杂化TiO ₂ /还原氧化石墨烯（TiO ₂ / rGO）在不同照射条件下（UV ）的光催化降解2,4-DCP和1-萘酚的动力学。（仅限UV + Vis和Vis）。2,4-DCP在rGO相上强烈吸附。随着rGO负载的增加，在UV和UV + Vis照射下没有观察到整体反应速率的增加，而在仅Vis照射下观察到了非常低的但没有无效的光活性，其随％rGO的增加而增加。

在此首次提出了定量动力学模型，该模型能够预测由具有不同的光吸收和固有反应性，具有不同的吸附底物和吸附能力的两相（无论相的性质是什么）组成的杂化光催化剂的光催化速率。根据其能带排列来划分电荷载流子。该模型能够使吸附效果与动力学效果脱钩。

从不同rGO负载下的吸附和动力学数据分析得出：2,4-DCP在rGO阶段优先分配；操作性光催化机理是基于半导体的紫外线吸收所促进的能带间跃迁。rGO对2，4-DCP的可见光活性可忽略不计，但不是零。光促进的TiO ₂导带电子不会注入到主要吸附2,4-DCP的rGO中。因此，提出了一些假设来证明rGO对总体氧化光活性的负面影响是正确的。