Tween-80对萘在3种金属氧化物上吸附的影响

用振荡平衡方法，研究了非离子表面活性剂Tween-80在3种金属氧化物（二氧化钛、三氧化二铁和三氧化二铝）上的吸附行为及其对萘在3种金属氧化物上吸附的影响。结果表明：Tween-80在三氧化二铁和三氧化二铝上的吸附符合Langmuir型吸附等温线，在二氧化钛上的吸附符合S型吸附等温线。Tween-80在3种金属氧化物上饱和吸附量的大小顺序为：二氧化钛> 三氧化二铝> 三氧化二铁。在三氧化二铁和三氧化二铝表面，萘与内层水相结合，吸附曲线呈非线性，Tween-80能提高其吸附能力。而在二氧化钛表面，萘主要吸附于外层水层，吸附曲线呈线性，Tween-80的加入会导致其吸附量减少。

Effect of Tween-80 on adsorption of Naphthalene on three metal oxides

By using a batch adsorption method, the adsorption isotherms of nonionic surfactant Tween-80 in three types of metal oxides (titanium oxide, ferric oxide, and aluminum oxide) were investigated and the adsorption behaviors of naphthalene with three types of metal oxides were compared. The results showed that the Langmuir model was appropriated for describing the adsorption isotherms of Tween-80 in ferric oxide and aluminum oxide, and the adsorption isotherms of Tween-80 in titanium oxide conformed to an S model. The saturation adsorption capacity of Tween-80 in three types of metal oxides followed the order titanium oxide>aluminum oxide>ferric oxide. On the ferric oxide and aluminum oxide surface, a naphthalene molecule combined with the inner water; its adsorption curve was nonlinear and its adsorption ability was improved by Tween-80.However, on the surface of titanium dioxide, naphthalene molecules were mainly adsorbed on the outer layer; its adsorption curve was linear and its adsorption capacity was decreased by Tween-80.